Aspen 模拟警告的意思

rainwind

如题，我在做一个变换的模拟，模拟流程打通后出现如下警告

*  WARNING WHILE INITIALIZING DESIGN-SPEC BLOCK: "BFWMF2"

      UNABLE TO CONNECT VARIABLE"BFWMF2.VARY.BW-02_H2O_MASSFLOW"

      TO ACCESSED VARIABLE"BW-02.BLK.H2O_MASS_FLOW"

      DUE TO UNKNOWN ACCESSED VARIABLE EO-NAME.CONNECTION WILL BE IGNORED.

请问这个警告是什么意思，怎么消除。

sici

可能是你的DESIGN SPEC的变量弄错了，你设定的变量不影响你的设计规定，可以把源文件传上来看一下

adog8207

最好把模拟文件发上来

小布丁

有个向左后退似得图标，点它同意后就消除了

rainwind

文件在这里，麻烦大家帮忙看看

rainwind

sici 发表于 2014-8-2 11:43
可能是你的DESIGN SPEC的变量弄错了，你设定的变量不影响你的设计规定，可以把源文件传上来看一下

上传了，你可以看看

adog8207

以下是帮助文件的内容，貌似很高深。

Equation-Oriented Strategy
The Equation-Oriented (EO) strategy is an alternative method to solving flowsheets in Aspen Plus. Normally,
Aspen Plus uses the Sequential Modular (SM) strategy to solve flowsheets. In this strategy, each block
computes its outlet streams given values for the inlet streams, model parameters and operating conditions.
When recycle streams are present, SM must iterate on all the blocks within the recycle loop to converge the
values of the tear stream. Similarly, design specs require iterative loops.
EO, on the other hand, collects the model equations for all the blocks in the flowsheet and solves them
simultaneously using specialized solvers. This has the advantage of avoiding iterations involving recycle streams
and design specifications. It therefore allows:
 Simulation of complex recycle processes
 Simulation of highly heat-integrated processes
 Efficient economic optimization
 Efficient model tuning via parameter estimation or data reconciliation
The disadvantages of EO are:
 Difficulty in diagnosing non-convergence problems
 Complexity of model configuration
Nonetheless, there are many classes of problems that can be readily solved in EO that are not possible in SM.
EO works well when all variables are near the solution. However, EO is not suited to solving a simulation
without good estimates for all variables. Thus, before you solve your flowsheet in EO, you must initialize it in
SM.
SM initialization does not require a completely converged SM solution. The minimum requirement is that each
block be solved once. How tightly the SM flowsheet must be solved to ensure a robust EO formulation is
problem-dependent.