question stringlengths 19 6.88k | answer stringlengths 38 33.3k |
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Problem Statement: How do I register Aspen Basic Engineering workspace with Smartplant? | Solution: To register a workspace with a Smartplant plant:
1 In the Aspen Basic Engineering Administration Application right click the workspace to be registered and select the pull-down menu option All Tasks | Smartplant Registration.
2 Enter the URL for the Smartplant server in the following format: http://<noden... |
Problem Statement: Why can I not add Medium Description and Code in the Piping Material Specification Schedule? | Solution: In order to add Medium and Material Codes in the Piping Material Specification schedule sheet, Medium Code Schedule and Material of Construction Schedule sheets have to be first created.
However, if the Medium Code Schedule is created under different case than the Piping Material Specification schedule shee... |
Problem Statement: RESET doesn't reset all the variables. | Solution: The RESET function has been changed between 10.2 and 11.1, it is not a bug.
In 11.1: RESETresets the FREE and RATEINITIAL variables to their default value, leaves Fixed and Initial variables untouched
In 10.2: RESET resets all variables
RESTART will rewind the simulation to time 0, unless you have changed t... |
Problem Statement: Are there any diagrams that demonstrate the difference between No U-bends, U-bends in Alternate Passes and U-bends in Every Pass? | Solution: Please see the diagrams below to explain the difference between No U-bends, U-bends in Alternate Passes and U-bends in Every Pass:
Keywords: U-bends, alternate, passes, nozzles, headers
References: None |
Problem Statement: What is the accuracy reported in the Simulation Messages window, when using FEASOPT optimization method? This is also reported when using maximum log likelihood in estimation method with the same optimization method. | Solution: FEASOPT accuracy is calculated with the following formula:
acc = abs(sigma(Gi*DXi)) + sigma(abs(MUk*Ck))
where
Gi is the gradient of the objective function wrt optimization variable i DXi is the next step on variable Xi (that is, the next iteration is X = Xi + DXi) predicted by the SQP code MUk is the Lagrang... |
Problem Statement: Can you explain how to handle boundary conditions for two dimensions distributions? | Solution: The issue to consider is how to handle the corners of the domain. Let's look for example at this model:
dq/dt = d2q/dx2 + d2q/dy2
for the domain x = [0,1] and domain y = [0,1] with the boundary conditions:
q(0,y) = 3 for y in [0,1]
q(1,y) = 3 for y in [0,1]
q(x,0) = 3 for x in [0,1]
q(x,1) = 3 for x in [0,1]
... |
Problem Statement: Project data are not visible when restoring workspace backup file | Solution: When restoring backup file which includes Project, it is necessary to have the same privileges.xml file used when the backup was taken.
Therefore, when backing up the workspace with Project, you need to keep a copy of the privileges.xml file located in the workspace folder. After restoring the backup, copy th... |
Problem Statement: What is the difference between a linear, explicit, nonlinear and torn group in the block decomposition? | Solution: Decomposition information could be accessed in the All Items pane of the Simulation Explorer --> Diagnostics.
This diagnostic information only becomes available after a simulation is run. If there are structural errors with the simulation this information is not available.
Group Type
Description
Linear
A line... |
Problem Statement: Why is the text converted to Latin when a PDF is created in Russian(Cyrillic), copied and then pasted into a sketch field within a datasheet? | Solution: This is a known MicroSoft issue and it will not be fixed in Aspen Basic Engineering.
To workaround this problem, export the drawing to a dwg or zyq file and then import into the datasheet sketch field.
Keywords: Russian, Latin, Cyrillic
References: None |
Problem Statement: What is the model discontinuity tolerance on the Integrator tab? | Solution: The model discontinuity tolerance (integrator solver options tab) specifies the model discontinuity tolerance, within which the time of the triggering of model events will be determined. Range is any positive real.
This is the tolerance to which model discontinuities are located. Default if 1.e-5 and range is... |
Problem Statement: Why are the tube side input and output fouling resistance values different? | Solution: In Aspen Acol+ and other Aspen HTFS+ programs, the outer bare diameter of the tube is normalized. The overall heat transfer coefficient U is found by:
1/U = ( 1/hx + rx )(Ao/At) + rw + ( 1/hi + ri )(Do/Di)
where:
h = heat transfer coefficient
r = resistance of fouling layer
A = area
D = diameter
and s... |
Problem Statement: Why is the file size in Aspen Acol+ larger than it is in AEROTRAN? | Solution: The primary reason the Aspen Acol+ (EDR) files are larger than the Aerotran (BJT) files is the file format used in writing the files. The EDR files use XML as the format for storing all the inputs and results. The BJT files were using a proprietary binary format which was more condensed than the XML format. A... |
Problem Statement: When I open my custom modeling or dynamics simulation, I get warning message saying that properties have not been initialized. What should I do?
Root Cause
It can happen when you are opening an older version or if properties are not embedded in the simulation and were externally created. | Solution: A good practice is to always save the properties file in the same directory as your custom modeling or dynamics file.
When this happens in custom modeler, it is usually because the properties file is in a separate location from the custom modeling simulation. Simply move the properties file you generated sett... |
Problem Statement: How to create a new Physical Quantity for ACM? | Solution: The predefined physical quantity names are specified in the file OnNewDocumentScript.vb that is located in c:\program files\aspentech\AMSystem 11.1\bin (or AMSystem 12.1\bin for version 12.1).
This is a VBScript file, which you can edit with Notepad. You can find the syntax in ACM on-line help. See Defining P... |
Problem Statement: Whenever I try to open a custom modeler product, I get the following message in the simulation messages box:
Failed to load file [File pathname], working directory is in use | Solution: You need to set it so that the working directory can be changed for the program at any time. To do this, navigate to Tools | Settings | Preferences.
On the pop up window, select the option that says “Allow setting of working folder location,” and your file will now open
Keywords: Custom Modeler, Dynamics, wor... |
Problem Statement: I have some Timedata blocks in my flow-sheet and I would like to put the active parameter for all of them to Off.
Is there a way to do that?
Applicable Versions
V7.3 and higher. | Solution: Create a script and use the following command:
Blocks(B2).Active.Value = Off”
Keywords: Timedata, active parameter.
References: None |
Problem Statement: What is the use for the Compare Datasheet/Diagram in right-click menu in Explorer? | Solution: This feature is used under Inter-disciplinary Work Flow(IDWF), which was introduced in v 7.0. The Inter-disciplinary Work Flow enables disciplines working on a project to interact and exchange data in a controlled way. All data owned by a user?s discipline remains private to members of that discipline until i... |
Problem Statement: How do I troubleshoot a SQL workspace issue when trying to create a manual SQL workspace? | Solution: NOTE: These are troubleshooting steps only; it does not tell you how to create a manual SQL workspace. For creating manual SQL workspace please refer toSolution ID: 126008
You should check following things when creating a manual SQL workspace issue:
1. Make sure that you create a database in the SQL serve... |
Problem Statement: How do I resolve COM errors in the bridge application?
Error: Com Error Line xxx in AZBridgeDoc | Solution: Generally COM errors in bridge are seen due to not enough access rights to the working directory. Once you provide read and write access to Workspaces folder and WorkspaceLibraries folder then you should not see this error message.
Keywords: com error, error in AZBridgeDoc
References: None |
Problem Statement: I have an ACM model that contains the following IF structure:
If (CONV<=CONV_START) Then
Executable statement 1
Else
Executable statement 2
Endif;
In the second branch of the IF statement, I would like to use a parameter whose value is equal to the time when the model entered that branch. ... | Solution: AssociatedSolution 106431 entitled “Which variable values are used for the dead_time block (DELAY)?
There is currently no feature in ACM to allow the user to directly utilize the simulation time as a variable. Use can be made of some equation which integrates a time variable until the condition is satisfied. ... |
Problem Statement: How can we enter Twisted Tape pitch in Air Cooled Exchanger? | Solution: Tube enhancements can be specified in Input | Program Options | Methods/Correlations | Tube Side Enhancement tab.
The enhancement type with Twisted Tapes, the start and finish tube pass number containing the inserts can be provided. The tapes when compared to no tube side enhancement can decrease the heat dut... |
Problem Statement: In the Aspen Exchanger Design and Rating (EDR) suite, the heat transfer coefficients presented are based on the bare tube outer diameter. One of the advantages of this method is that the resistances can simply be summed, then the reciprocal taken to give the overall dirty heat transfer coefficient. | Solution: The Overall heat transfer coefficient can be normalized to the bare tube outer diameter from;
where D is the tube diameter (o,i = bare tube outside, inside), A is the Area (o,t = bare tube surface, extended surface), r = resistance, with i fouling inside the tube, x fouling on the crossflow side, w the wa... |
Problem Statement: When a datasheet is exported in Excel, it may happen that radio buttons which have been selected are not printed correctly. | Solution: This problem can be solved by un-selecting the Black and White options in the excel source file or in the exported excel file.
With Office 2003, the option can be found in Page Setup=>Sheet tab.
With Office 2007 and Office 2010, the option can be found in Page Layout=>Page Setup=>Margins=>Custom Margins=>Shee... |
Problem Statement: How to use the EDI emulation with ACM? | Solution: In SPEEDUP 5.5-6 there is a functionality called External Data Interface or in short EDI. This is superceded by the Simulation Access Extension in ACM, or SAX in short.
This example could help to find out how to migrate a SPEEDUP simulation using EDI to the new ACM environment. For the conversion of the SPEED... |
Problem Statement: Will running a delete query on MS SQL corrupt my workspace? | Solution: Changing data with SQL scripts should be avoided at all costs. The ABE object-oriented database enables users to query and change selected attributes with mimimal effort (most scripts are extremely small). The SQL database should only be queried directly to fix database integrity problems that cannot be fixed... |
Problem Statement: Why does the ribbon bar in Excel datasheet editor disappear when clicking elsewhere on the screen? | Solution: The Excel datasheet editor Ribbon bar is designed to help you quickly find the commands that you need to complete a task. To reduce screen clutter, you can minimize the ribbon and show only tabs. To do that:
· Right-click any empty space on Aspen Datasheet ribbon bar.
·  In the list, click ... |
Problem Statement: How can I link multiports with sub-models?
Say for example that I have a submodel:
Model submod
in_f as input multiport of Fport;
out_p as output Fport;
out_p.F = sigma(in_f.connection.F);
End
The Mixer model declares one instance of the submod model. What is the syntax to use if we wish to lin... | Solution: You must use a for loop for the multiport to repeat the link statement for each stream connected to the multiport.
Model mixer
in_f as input multiport of Fport;
out_p as output Fport;
b as submod;
for i in in_f.connectionset do
link in_f.connection(i) and b.in_f;
endfor
link out_p and b.out... |
Problem Statement: How do I scale multiple objects for current drawing in drawing editor? | Solution: Follow below mentioned steps to scale multiple objects for current drawing.
1. Open Drawing editor application, connect to workspace and open PFD drawing type for which you need to scale multiple objects.
2. Select objects for which you need to change the scale by using ctrl key and left mouse button.
3. Clic... |
Problem Statement: What is Acol+? | Solution: Acol+ combines Aspen HTFS with Aspen B-JAC. Click on this link to find out more: Acol+ Overview
Keywords: ACOL; Air Coolers; Heat Exchange; Design; Rating
References: None |
Problem Statement: How can I add more font types in 'text' menu in the drawing editor? | Solution: The list of the font in this menu comes from System fonts folder. If you want to add new fonts there( TrueType Only), you should go to Control Panel=>Fonts folder and add the font file there.
Keywords: None
References: None |
Problem Statement: The last version on which the converter was available is AES version 11.1sp1. The converter is no longer released with version 12.1 or above. What can be done if I need to convert now a file from SPEEDUP to ACM? | Solution: The firstSolution is to get your AES 11.1 CDs and install Aspen Custom Modeler. You don't need a license to install the software, and you don't need a license to run the SPEEDUP to ACM converter.
The secondSolution is to install the command line version of the converter. Unfortunately, the GUI of the conver... |
Problem Statement: How to perform a steady state parameter estimation in Aspen Custom Modeler (ACM) when experimental reaction data (eg. conversion) is available and it is necessary to estimate the rate constant for the reaction. | Solution: The first step is to make sure that the steady state ACM file runs with no errors. It is a good idea to carry out a sensitivity analysis of the ACM model by varying the values for the fixed variables at the inlet of the model and observe the convergence.
In the attached file the reaction occurs between A and ... |
Problem Statement: How do I troubleshoot SQL workspace issues when trying to create a default SQL workspace? | Solution: NOTE: These are troubleshooting steps only; it does not tell you how to create a??Default SQL workspacea??. For creating Default SQL workspace please refer toSolution ID: 126006
You should check following things to troubleshoot a??creating Manual SQL workspace issuea??.
1. You must use unique workspace ... |
Problem Statement: Where can I find e apmodelcatalog.xml for Aspen Custom Modeler version 2006 and above? | Solution: The file apmodelcatalog.xml registers the installation of ACM model extensions and points out the route for the dll files. The location path has changed significantly from older versions of our process modelling suite. The old path was:
C:\Documents and Settings\All Users\Application Data\ASPENTECH\Aspen Plus... |
Problem Statement: How to call the procedures to return the enthalpy and the density of non-conventional components? | Solution: See the attached example which illustrates how to call the procedures available from the Modeler library to return:
- mass density of a mixture of non-conventional components: pDens_Mass_NCSolid
- mass enthalpy of a mixture of non-conventional components: pEnth_Mass_NCSolid
The procedures are described in t... |
Problem Statement: How do I create an included library (*.azci) file? | Solution: To create an *.azci file:
1. Open class library editor.
2. Click insert menu on the top and pick library.
3. You will be directed to save azci file under your datamodel folder. Do NOT change the location as *azci should be in the same location as *.azcl file.
4. Provide a name and click open. ... |
Problem Statement: My simulation file fails to open in version 2006. It was ok in version 2004.1. | Solution: Check the error messages displayed in the simulation messages window. If you simply double click the file to open it, this window may not be displayed. A better way to open the file to troubleshoot this issue is to first start ACM, then open the file with File, Open.
A potential cause is the new keyword Run... |
Problem Statement: How do I resolve the error message invalid descriptive text in the datasheet editor? | Solution: If you enter a text in numeric field in the datasheet, which is not the part of DescriptiveText.txt file, you should see above error message. All the prefix, postfix and substitution text should be part of DescriptiveText.txt, which by default is located under..\\AspenZyqadServer\Basic Engineering**.*\Workspa... |
Problem Statement: What is the order of execution of CCF calcs versus CTRAN calcs? | Solution: The order goes like this:
Get PCS data
Perform Custom input Transforms (CTRANI)
Perform CCF input Calcs
Perform Standard input transforms (STRANI)
Run validation and control engine
Perform Standard output transforms (STRANO)
Perform CCF output Calcs
Perform Custom ouput Transforms (CTRANO)
LSTCHK
Put PCS da... |
Problem Statement: Calculation modes of Aspen Plate | Solution: Aspen Plate has four calculation modes. They are (1) Design, (2) Checking, (3) Simulation and (4) Design (given plate).
(1) Design and (4) Design (given plate)
The program provides one or more designs, based on a notional set of plates held within the program (Design), or on one specified plate (Design (g... |
Problem Statement: How to create a linked object and what exactly is the linked object? | Solution: To create one or more linked objects:
1. On the diagram, select the object you want to copy a link to.
2. From the Edit menu, click Copy.
3. From the Edit menu, click Paste Special.
4. In the Paste Special dialog box, select Paste Link.A rectangle appears on the diagram.
5. Move the rectangle to the desired p... |
Problem Statement: Can I export Aspen Air Cooled Exchanger program results to Microsoft Word? | Solution: Yes, this can be done.
Run the file then select File | Export to | Word document.
Next, choose the Select all results check box then click Export
Keywords: Microsoft Word, Results
References: None |
Problem Statement: How do I specify a non-standard SQL port? | Solution: You can specify a non-standard SQL port in the Workspace.udl file by using a comma after the server name as shown in the screenshot below:
The Workspace.udl file is located inside your Workspaces folder. i.e. For workspace with a name AZ162, workspace.udl file should be located at ...\\AspenZyqadServer\Work... |
Problem Statement: In Aspen Air Cooled Exchanger program, on Results | Mechanical Summary | Exchanger Data | General tab, in Bundle section, a value for ''Effective tube length'' is reported, that is different from the ''Total tube length''. The ''Effective tube length'' is the proportion of the tube that is available ... | Solution: explains how the ''Effective tube length'' is determined if not specified.
Solution
The ''Effective Tube Length'' is calculated from the ''Total Tube Length'' minus ''Support Plate Thickness'' times ''Number of Supports'', minus ''Tubesheet Thickness'' times ''Number of Tubesheets''. The corresponding mathema... |
Problem Statement: How will Aspen Custom Modeler and Aspen Dynamics locate custom binary files such as dynamic linked library (DLL) for procedures or simulation access extension (SAX)? | Solution: Aspen Custom Molder (ACM) and Aspen Dynamics (AD) use the same approach as all other Windows program to locate a dynamic link library (dll), details please see
http://msdn2.microsoft.com/en-US/library/ms682586.aspx
ACM/AD also will search in:
- the folder where the dynf/acmf file is located (GUI working folde... |
Problem Statement: How do I improve performance when getting and setting variables in the Aspen Custom Modeler COM interface? | Solution: Here are a couple of tips for speeding up the access to variables.
1) Read the Help topic Improving the Speed of Visual Basic Scripts in the Automation
Keywords: Automation, COM, getvariable setvariable.
References: section. Even though it refers to VB scripts, it is really talking about the Automation Interf... |
Problem Statement: | Solution: you can use Changesinputs command under Option list while declaring procedure. For example:
PROCEDURE PressureCal
CALL : pres;
LIBRARY : C:\Examples\mysim;
INPUTS : Flow, geomatry factor;
OUTPUTS : pressure-drop;
OPTIONS : ChangesInputs;
LANGUAGE: Fortran;
IMPLEMENTATION : SUBROUTINE C:\Examples\pressureCal... |
Problem Statement: What is the purpose of PermanentRevisionMarks in the Aspen Basic Engineering configuration file? | Solution: In the Aspen Basic Engineering configuration file, StandardlibrarySet.cfg, there is a setting called PermanentRevisionMarks. It is set to False by default.
If PermanentRevisionMarks =False, then the RevisionMark on the datasheet will only stay when the linked field is updated and the last revision number will... |
Problem Statement: Why are table attributes in Aspen Custom Modeler sometimes missing even though they have been selected correctly in the properties table? | Solution: Somehow the value of column width in the local variables form has been set to zero. Please delete the following registry key: HKEY_CURRENT_USER\Software\AspenTech\AMSystem\XX.X\Explorer\Settings
This will remove any saved column widths for all forms. It will not do any harm to delete all the settings, the fo... |
Problem Statement: How can I compile and link the source code of my procedure with the Intel fortran? | Solution: Starting with version 2006, ACM supports only the intel compiler for fortran procedures. It generates the appropriate makefile (makeusercode) which is invoked when you go to tools, generate procedure code and leave the option to execute the makefile active.
In some cases it may be convenient to build the dl... |
Problem Statement: When I try to create a HTRI input file for air coolers I get the error below:
Error:<AZError Desc=Failed to find ClassView for Htri HR=E_FAIL File=.\ReadView.cpp Line=279 />
<AZError Desc=Failed to find ClassView for Htri HR=E_FAIL File=.\Main.cpp Line=142 />
<AZError Desc=Failed to find ClassView ... | Solution: Currently, thermal design interface does not export/import air coolers to HTRI.
ClassView for HTRI is mapped to class ShellAndTubeHeatExchenger.
Keywords: HTRI, aircoolers, AirCooledExchanger class
References: None |
Problem Statement: Why doesn't the availble sheet connector window appear when I click on link sheet connectors? | Solution: If the stream connector is not linked properly to the connection, then 'available sheet connector' window will not appear when you will click on the 'link sheet connectors'. To make sure if the connection is linked to sheet connector, click on the connection to select it. If you see a black dot connection, it... |
Problem Statement: How do I create a customized excel template for exporting the EDR results? | Solution: To create your own customized excel template for the results from EDR, first make a copy of the *blank.xlt template located in the Aspen Exchanger Design and Rating\Excel Templates sub-directory and rename it to use as your template for the customized results form.
The steps to customize the excel template ar... |
Problem Statement: Why do Aspen Custom Modeler (ACM) and Aspen Plus OLE interfaces behave differently as automation servers? When Aspen Plus is used as an automation server, several references to the application object can be created and maintained. While when ACM is used as an automation server, only one reference to ... | Solution: This is an incomplete observation.
In a client application, multiple handles to Aspen Plus and ACM can be created and maintained. However, the user neesd to understand the different implementations of OLE interface in the two products. With Aspen Plus OLE interface, a new application object is always created ... |
Problem Statement: Is it possible to use hiTRAN wire matrix inserts in Aspen Air Cooled Exchanger? | Solution: Starting with V7.2, Aspen Air Cooled Exchanger can now model the proprietary hiTRAN wire matrix inserts made by Cal Gavin Ltd. To use this option, you must have access to the software component (dll) provided by Cal Gavin (www.calgavin.co.uk) for these inserts. There are three hiTRAN calculations options:
1... |
Problem Statement: How do I perform a dew point or bubble point calculation using submodel Props_Flash2? | Solution: In Aspen Custom Modeler, the submodel Props_flash2 can be used to calculate dew point and bubble point. To perform a two phase dew point calculation, the following code can be used:
Pflash2 as Props_flash2 (T=T, P=P, z=zin, h=hout);
Pflash2.vfR: Fixed, 1;
Here T is temperature (C), P is pressure (bar), z ... |
Problem Statement: Which LMTD equations are are used in the pLMTD procedure call? | Solution: ACM uses the standard equations for LMTD based on countercurrent and cocurrent flows when the pLMTD call is executed. The call is determined off of the input conditions that are specified.
You can see how this call can be implemented in the source code of the Aspen Dynamics HeatX model, if you have a lice... |
Problem Statement: Here is a demo case file of a custom model developed in Aspen Custom Modeler describing how to handle oil assays, stream and discrete output. | Solution: The attached files are demonstrations of Simplistic User Models created in Aspen Custom Modeler (ACM). These address the following issues:
Show Organization of Data, Create Oil Assays
Capture Physics
Handling Streams & Discrete Output
Model will reside in ASPEN server
Discuss and exchange best practice
Pl... |
Problem Statement: How do I resolve a fatal error that occurs when the equipment type is set to Ducted Bundle in Aspen Air Cooled Exchanger? | Solution: Aspen Air Cooled Echanger can use a Ducted Bundle if specified under Input | Application Option and Equipment type. If the user is trying to specify extra tubes, the program will show a fatal error like the following:
Input Error 8004: The data input for Bundle type is unacceptable.
There is a difference ... |
Problem Statement: I want to use saturate natural gas as a fluid within the program. Can I do it in Aspen Air Cooled Exchanger? | Solution: No, it is not possible to do it within the software.
The alternative is to use a software such as Aspen Plus or Aspen HYSYS to define a heat exchanger with the saturated natural gas stream. Then, use the import menu in the Aspen Air Cooled Exchanger to import the fluid properties into your simulation.
Keyword... |
Problem Statement: Some time, an element in an array cannot be found on the variable table. For example, you may have an array named TEMP with 4 elements. On the all variable table, you only see
TEMP[1]
TEMP[3]
Where is array element TEMP[2]? | Solution: In similar situations, if you check the appearance of TEMP elements in equations, you will find that TEMP[2] does not appear in any of the equations in your model.
By design, Aspen Custom Modeler will not allocate the variables that do not appear in at least one equation.
Keywords: missing array element, arra... |
Problem Statement: How can I scale my equations? | Solution: When ACM is solving a simulation which involves non-linear equations (which is almost always the case), the solver will iterate over the value of variables until the convergence criteria is satisfied. There are 2 convergence criteria available in ACM:
- variable steps
- residuals
The first criteria is satisfi... |
Problem Statement: Why do I get this warning message?
Group 1: B1.y
Integrating from 0 to 0.01
Restarting integrator at 0
Warning: B1.x is a torn state variable!!! Simulation results may be unreliable!
The model is:
Model demo
x as realvariable (initial);
y as realvariable (free);
a as realvariable (fixed, 2)... | Solution: Remove the tear keyword from the procedure call.
A state variable is a variable for which the model is using the time derivative ($x or x.derivative) in some equations.
In older versions this message was stating that the index of the simulation was greater than 1 and was an error instead of warning. From vers... |
Problem Statement: Get Receive cim-io errors - Running cim-io to opc on dmcplus machine with a remote opc / generating get failures | Solution: FYI: Actually the industry standard is to connect the OPC client (cimio for opc) to an OPC server locally or directly to a remote system. This method does not require the OPC client to be installed on the OPC server system. What this configuration does it to direct the client to connect to a registered OPC se... |
Problem Statement: How does CV Step Work?
Note: The attachment to this | Solution: contains the following text with the addition of screen shots for better explanation.Solution
The Aspen DMCplus code has been reviewed, and found that the documentation is a little misleading. The current documentation has the phrase, Use CVSTEP to limit the size of a steady-state target change per control cy... |
Problem Statement: Why most of the options in Datasheet definer or Excel Datasheet editor are grayed out? | Solution: When you will connect to workspace in Datasheet Definer or Excel Datasheet editor, the options will be grayed out till you will open the datasheet. So to make the options available, open the datasheet first.
Keywords: .
References: None |
Problem Statement: Which databases are supported by Aspen Basic Engineering V7.3? | Solution: Aspen Basic Engineering supports these databases on 32-bit and 64-bit platforms:
Microsoft SQL Server:
Microsoft SQL Server 2005 SP3 (Standard Edition),
Microsoft SQL Server 2005 SP3 (Enterprise Edition) or
Microsoft SQL Server 2008 R2 (Enterprise Edition)
Oracle:
Oracle Database 10g Release 2
The bit typ... |
Problem Statement: When I compile my models, I get warning messages such as:
Warning at position 11: The assignment to external property x may conflict with other assignments made to the same property
What does it mean? Should I worry? | Solution: Yes, this warning should not be ignored. Let's remind ourselves what is the purpose of the external keyword when used in submodels. This avoids duplication of variables that would be used both in the model and the submodel; instead of declaring a variable, the external keyword declares a pointer to the parent... |
Problem Statement: 当使用Aspen EDR(Exchanger Design and Rating)程序取代Aspen B-Jac程序进行设计时，用户可能已经没有B-Jac的使用授权。(更多关于Aspen产品不同版本的技术支持有效期的信息，请到Aspen技术支持官方网站搜索'product lifecycle'关键词)
本解决方案讲解，除了使用如何'File Conversion Utility' ( | Solution: 125142)之外，如何在EDR程序界面内部将B-Jac模型文件转换为EDR 模型文件。
Solution
让我们用转换Areotran to AirCooled exchanger (空冷换热器)作为例子。您需要进行以下步骤:
? 您需要打开一个新的EDR程序窗口，选择'Aerotran - Air-cooled & economizer thermal design'.
? 一个空白的'Areotran' 文件会被建立。在程序的顶端目录里找到File > Open,找到您要转换的Aerotran文件，选中并打开它。您会看到Aerotran的模型文件会在其相应的应用窗口中... |
Problem Statement: Why is the Browse button disabled when we open the Open workspace dialouge box and choose connect to a workspace? | Solution: When server name is empty, ABE (Aspen Basic Engineering) will not allow user to browse for workspace name.
To enable browse button, you should provide valid ABE server name.
Keywords: disabled button, browse button, open workspace
References: None |
Problem Statement: How do I prevent the display of a stream in the summary sheet? | Solution: You can apply 'Filters' in the summary sheet. To filter stream XX in the summary sheet, you can use the below code:
[?Class=PipingSystem,
DisplayName=PipingnotXX?]
 AZFilter PipingnotXX( )
 PipingnotXX = true
if Self.ItemNumber = XX Then
 PipingnotXX = false
End if
End AZFilter
Keywords:
References: N... |
Problem Statement: How can I read the value of some variables from a file before a run, then write the value of other variable values to a file after the run? | Solution: A simple approach is to use the FileSystemObject provided by the VBScript language. For example, the following script reads the value of B1.T and B1.p from the file d:\input.txt.
Const ForReading = 1, ForWriting = 2
Dim fso, f
Set fso = CreateObject(Scripting.FileSystemObject)
Set f = fso.OpenTextFile(d:\inp... |
Problem Statement: How snapshots tool infers whether there are structural changes or not when a parameter value is changed? | Solution: At the moment a parameter value is changed, Aspen Custom Modeler checks whether the parameter is used to dimension an object. If a parameter value is changed but the parameter is not used to dimension anything in the model, then ACM determines that there is no structural changes and as such keeps the existing... |
Problem Statement: New Feature in Aspen Custom Modeler V7.2 - New Model Editor | Solution: Aspen Custom Modeler V7.2 includes a new model editor which includes a number of usability enhancements and time-saving features including:
Split screen editing
Automatic completion of keywords
Popup lists of available types
Code outlining/folding
Automatic indenting
Automatic highlighting of matching parenth... |
Problem Statement: Is it possible to modify the flowsheet constraints with automation, such as for example using a script? | Solution: The flowsheet constraints let a user specify additional equations and variables in the Flowsheet folder. In those equations you can access variables from any block or stream. This may be useful as an alternative to control signals and control models.
It is possible to specify the flowsheet constraints code ... |
Problem Statement: New Feature in Aspen Custom Modeler V7.2 - Active Models | Solution: The Active Models feature acts on a selected instance of a model. Right click on an object and select Active Model to view, create, or create and apply (use) an active model from the selected model.
Models can contain conditional statements that change the equations used depending upon the configuration of ... |
Problem Statement: If multiple versions of the Intel Fortran compiler are installed, how do you set a specific version to be used to compile a Fortran procedure? | Solution: Intel FORTRAN versions 9.0, 9.1, 10.0, 10.1, 11.0 or 11.1 are supported versions for ACM V7.2. The compiler must be configured so that it can be used from the command line. If multiple versions of the compiler are installed, by default the most recent version is used. To specify a particular version, set the ... |
Problem Statement: How licenses are allocated in Aspen Basic Engineering? | Solution: In Aspen Basic Engineering, licenses are checked per workspace/ per user/per client machine basis. There can be following scenarios:
When first connecting to a workspace, a license is checked out. This is done on a per user basis; a second user will check out a second license and so on. No additional ... |
Problem Statement: What can be reasons of The remote procedure call failed. error message, as shown below?
<AZError Desc=The remote procedure call failed. Src=AZBroker::TestWorkspaceConnection Activity=Initializing workspace server HR=0x800706be File=.\AZBroker.cpp Line=372 />
<AZError Desc=The remote procedure call ... | Solution: This error may occur due to one of below reasons. You can check the following:
1. Ensure that AZBroker service is running. You can open services either from control panel | administrative tools | Services or using services.msc on the run command. If it is not running, you can start it. Also make sure tha... |
Problem Statement: Can I run a query directly in SQL, rather than using the Aspen Basic Engineering query editor? | Solution: The SQL database should only be queried directly as a last resort when Query Editor scripts cannot be used, e.g., to fix database integrity problems that cannot be fixed with a Query Editor script. Changing data via SQL queries can corrupt a workspace.
Keywords: SQL query, ABE Query editor, workspace integrit... |
Problem Statement: I need to make sure my Visual Basic code calling GetObject is starting a specific version of ACM. How can I select it? | Solution: There is no user-friendly method to do this. In fact, we recommend using the CreateObject method for which the version can be specified. With GetObject, we rely on the Windows registry which specifies how a file extension (e.g. .acmf) is related to a specific software. This is set at installation time. If you... |
Problem Statement: A user has created library, and would like to run without the default library. How to do this? | Solution: Aspen Custom Modeler offers a command line option /Nodefaultlibraries. With this option, the default Aspen Custom Modeler libraries will not be loaded and only the user created library is used.
The attached document contains the detailed instruction on how to apply this command line option.
Keywords: default ... |
Problem Statement: How does Aspen Custom Modeler calculate the standard deviation of estimated parameters? | Solution: The attached document explains how Aspen Custom Modeler calculates the standard deviation of the estimated parameters when using the weighted least squares method.
Keywords:
References: None |
Problem Statement: How do you access the stream and block variables in ACM/AD for cases in which a stream and block have the same name? | Solution: For a situation where both a block and a stream have the same name, for example S1, the variables for the one that is created first will be implicitly referenced (in say the Varibale Find tool, Profile plots, Scripts etc...) by the simple abbreviation,
S1.variablename
But when the second is added, say the b... |
Problem Statement: Does Aspen Custom Modeler support multiple inheritance? | Solution: An Aspen Custom Modeler language construction such as:
MODEL xxx USES p1
...
END
is correct in Aspen Custom Modeler, and makes the model xxx inherit all of the equations and variables (and other properties) of its parent model p1.
However there is no construction like:
MODEL yyy USES p1 USES p2
...
END
This s... |
Problem Statement: Say for example I have an integer parameter n and an array x([1:n]). How to apply only on odd elements of x (x(1), x(3), x(5), etc)? In other words, what's the right syntax in Aspen Custom Modeler for the following statements?
for i in ??? do
x(i) = some expression;
endfor | Solution: Strictly speaking, the loop is not like in other programming languages repeated over odd values of the index i. In fact, we need to set up the right set expression to obtain an integerset with only odd integer values. The range operator : in integerset expressions always assumes an increment of 1. This cannot... |
Problem Statement: Why is the filter button grayed out? | Solution: There can be two reasons of why Filter button in Excel Datasheet editor is grayed out:
1. The Filter button is only applicable to summary sheets. If you are working with object datasheets, it will not be active.
2. The Filter button is grayed out when you open summary sheet for first time. To activate... |
Problem Statement: When I open ABE Administration Tool, an 'AZServer.exe' process for each workspace will briefly run before the admin tool open, and then the Administration Tool will open slowly. Why is this process running? | Solution: If a user's login is not a member of the ZyqadAdministrators group, an AZServer.exe process will be launched to determine if user has rights to administer each workspace as the Administration Tool builds its workspace list. Roles and Access Rights are stored in separate privlege.xml files for each workspace.... |
Problem Statement: How do I make Aspen Basic Engineering Server recognize KBs or *.net modules? | Solution: It is possible that the KBs or *.net modules are on different server than installation directory or UNC path name specified in the configuration file.
You must copy the *Net KBs to a folder on same machine as the server program files and point to the KBs using the ManagedKBs directory keyword in workspace l... |
Problem Statement: In ACM, there can be two types of tasks, event-driven and callable. Where should callable tasks be entered? | Solution: A callable task can not be executed by itself, and can only be used as a statement in a event-drive task. A callable task should be entered at the following places:
1) Simulation | Custom Modeling | Tasks
2) Simulation | Flowsheet
Keywords: callable task
References: None |
Problem Statement: New Features in Aspen Custom Modeler V7.2 - Overview | Solution: Aspen Custom Modeler V7.2 includes the following new capabilities:
New editor
Creation of Active Models
Improved diagnostics
Model Export usability improvements
Return to last converged step
Faster Opening of Simulations
Improved Overall Quality
New Editor
The text editor is used to edit type definitions, for... |
Problem Statement: What is the difference between open and close enumeration? | Solution: An enumeration can be defined as Open or Closed:
Open
An open enumeration has an initial option list defined in the definition but this is not considered to be comple set of possible options. A user can use the value available in the list or type in an alternative value.
Closed
A closed enumeration is one whe... |
Problem Statement: Where can I find a list of examples for Aspen Plate Exchanger? | Solution: In the installation folder, there are some example files which are delivered with the installation, these examples can be found typically in:
C:\Program Files (x86)\AspenTech\Aspen Exchanger Design and Rating V9.0\Examples
There is one example file per calculation mode, the description of which can be found i... |
Problem Statement: Estimation run is too slow | Solution: For some dynamic simulations when there is much communication between the GUI and server, enhanced performance can be obtained by relaxing the synchronization between the GUI and server. For a reasonable size simulation, increasing the value of the environment ACM_STEP_SYNC can give optimum performance improv... |
Problem Statement: How to double server performance by disabling folder security? | Solution: Performance Improvement by disabling folder security
By default, Aspen Basic Engineering supports folder security: users with sufficient privilege can set the security options on a folder which is then applied to its contents. This capability results in both a performance and workspace size overhead. When f... |
Problem Statement: Why can't I remove or rename components in explorer? | Solution: In Aspen Basic Engineering explorer, the Remove/Rename components button is grayed out under Edit|Component management.
This is because this is a privilege which is assigned to only specific users as shown below:
If you want to have this privilege, contact your administrator.
Keywords: set up, access, permiss... |
Problem Statement: When importing data from Capital Cost Estimator to a workspace based on our libraries there is always an error reported at the end of the transfer and no report of the transfer is shown. All data associated with the equipment object appears to be transferred.
The problem may be related to the failu... | Solution: There is a PlotPlan KB that can be removed from the workspace's configuration. However, the Cost Mapper will attempt to call Rule within the PlotPlan KB to set up the associations. This call may be failing.
To eliminate the error, it may be possible to change the PlotPlan KB so that only the CreateAssociati... |
Problem Statement: Can you select one higher/ lower signal values comparing between two? | Solution: One can use HiloSelect control model to compare two output values and select higher or lower of them. If you want to select which value to pick, you need to right click on the model and click configure. From the table, you need to select which input to select.
Keywords: Output, Signal, Configure
References: N... |
Problem Statement: How do I remove a deleted workspace from the list of workspaces displayed in administration tool? | Solution: Sometimes the workspace is not removed from administration tool after it has been deleted. You can remove it by restarting the AZBroker service.
Please be careful before you restart the Broker service as it will disconnect all the workspace connections.
Keywords:
References: None |
Problem Statement: While trying to export data to an Exchanger Design & Rating (EDR) file from Aspen Basic Engineering (ABE) using the Thermal Design Interface, I am getting the following error:
Error: on creating default file in Tasc+ working directory for export using registered template.
Error Details: Invalid roo... | Solution: This issue arises because EDR is running on virtual machine and ABE is running locally.
Because EDR is not installed locally on PC the root, the directory
HKLM\Software\AspenTech\B-JAC\CurVer\ does not exist and ABE cannot find the registered template.
Install both EDR and ABE locally on the PC to have ... |
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