MSC Nastran 2012.2 DMAP程序员指南

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"这是关于MSC Nastran 2012.2版本的DMAP（Data Manipulation Access Program）程序员指南，由MSC Software Corporation提供。该文档主要服务于那些希望深入理解和编程自定义DMAP语言的用户，以扩展或定制Nastran的功能。DMAP允许用户在Nastran分析流程中进行数据处理和控制。" 正文： DMAP（Data Manipulation Access Program）是MSC Nastran中的一个高级特性，它是一种编程语言，旨在帮助用户定制和扩展Nastran的计算能力。通过DMAP，用户可以创建自定义的工作流程，处理输入数据，控制分析过程，以及格式化和输出结果。DMAP程序通常用于复杂的工程问题，以满足特定的分析需求。在"MSC Nastran DMAP Programmer’s Guide"中，用户可以找到关于如何编写和应用DMAP的详细信息。文档可能涵盖以下几个关键方面： 1. **DMAP语法与结构**：DMAP语言的基础，包括语句类型、变量定义、条件语句、循环结构等，这些都是编写DMAP程序的基础。 2. **数据处理**：DMAP允许用户在分析前、分析中和分析后对数据进行操作，例如数据导入/导出、数据转换、错误检查等。 3. **控制流与流程控制**：如何使用DMAP来控制Nastran的分析流程，比如选择分析类型、设置参数、调用子程序等。 4. **错误处理和调试**：在开发DMAP时，了解如何处理错误和调试代码是至关重要的，这可能包括错误捕获机制和日志记录。 5. **应用实例**：为了帮助理解DMAP的实际应用，文档可能包含多个示例，展示了如何解决具体工程问题。 6. **接口与集成**：如何将DMAP程序与Nastran的其他部分集成，包括输入/输出文件的处理，以及与用户界面或其他软件的交互。 7. **性能优化**：由于DMAP的目的是提高效率，因此文档可能包含有关如何优化代码以提高计算速度和资源利用率的提示。 8. **软件许可证和版权信息**：文档中提到，软件可能包含第三方的受版权保护的组件，这些组件是从MSC Software的供应商处获得许可的。重要的是，虽然此文档提供了详尽的指导，但用户必须明白，DMAP的应用需要对工程问题有深刻的理解，以及对Nastran分析过程的熟悉。使用DMAP时，用户应意识到可能存在风险，因为任何错误都可能导致分析结果不准确，甚至可能对用户或公司造成损失。因此，使用前务必仔细阅读和理解文档，并根据需要进行测试和验证。

DMAP Programmer’s Guide

Parameters

Parameters can be either constants, variables, or expressions and can represent one of several types:

Also, the real and complex types are either single or double precision. The following table indicates the

storage units required as a function of data type. One storage unit is the basic word size on a computer.

Typically, a word is 32 bits long on a short-word computer and 64 bits on a long-word computer.

The type of a parameter must be declared in at least one of three ways:

Constant Parameters

A constant represents a fixed value and is a number (integer, real, or complex), logical, or character

string.

Type Description Example(s)

Integer whole number 10 or -4

Real decimal number that is a whole number and a

decimal point, with an optional decimal fraction.

27000. or 2.7E5 or

2.7D5

Complex a pair of real numbers representing the real and

imaginary parts of a complex quantity

(1.1,2.3) or

(1.D0,3.5D1)

Logical represents either TRUE or FALSE TRUE or FALSE

Character a string of 1 to 80 characters 'GEORGE'

Type No. of words

Integer

Real single precision

Real double precision

Complex single precision

Complex double precision

Logical

Character

1 to 20

Constant Inherent in its specification or construction

Explicit On a TYPE statement for variable parameters

Implicit In a module’s parameter list for variable parameters

Main Index

DMAP Programmer’s Guide

Parameters

Logical Constants

A logical constant is specified as TRUE or FALSE.

Character Constants

A character constant is a string of 1 through 80 characters that may have embedded blanks. A character

constant must also be enclosed by right hand single quotation marks.

Variable Parameters

A variable parameter is represented by a symbolic name, and its value may change during the DMAP

execution. The name of a variable parameter does not have to be unique with respect to symbolic names

for modules, data blocks, subDMAPs, or LABELs. The name of a variable parameter cannot be NOT,

AND, XOR, OR, or EQV.

Variable parameters can have their attributes (type, authorization, and default) set explicitly with a TYPE

DMAP statement or implicitly by a module. (Variable parameters that are saved on the database must

also be designated as NDDL parameters in the TYPE DMAP statement). Variable parameters that are not

specified with a TYPE DMAP statement use the attributes from the DMAP instruction where the

parameter first appears.

All variable parameters that are used as input to a DMAP instruction must be initialized on a TYPE

statement or previously defined in one or more of the following:

• Assignment (=) statement output

• DMAP module output with "S,N" prefix

• CALL statement output with "S," prefix

• SUBDMAP statement parameter list

If one or more of the above is not satisfied, then User Fatal Message 439 will be issued during DMAP

compilation.

Value of a Variable Parameter

During a DMAP execution or when restarting a DMAP from the database, the value of a variable

parameter is determined by the first applicable value on the following sequential list:

1. Value from the most recently executed assignment DMAP statement or the most recently

executed save function (S,N prefix. See

DMAP Modules and Statements, 579).

2. Value from the PARAM Bulk Data entry, if the parameter NAME has the Y authorization.

3. Value saved on the database, if the parameter NAME is listed with an NDDL TYPE DMAP

statement and the run is a restart.

4. Value from the NAME=v, if present in a non-NDDL parameter TYPE instruction. This value is

determined at DMAP compile time from the TYPE instruction (regardless of its location in

DMAP) that contains the statement.

Main Index

Chapter 1: Direct Matrix Abstraction

Parameters

5. Default value from the NDDL, if the NDDL keyword is specified on the TYPE DMAP statement.

Parameters listed in the NDDL always have a default value of zero, blank, or FALSE, unless a

value is explicitly given in the PARAM NDDL statement.

Determining the current value of a variable parameter is also summarized in the following table.

Predefined Variable Parameters

The program predefines the value of some variable parameters. It is not necessary to type these

parameters with a TYPE DMAP statement, nor is it possible to change their type. We do not recommend

changing these parameter values. The predefined variable parameters are:

Initial values for variable parameters can be specified using the PARAM Bulk Data entry or the PARAM

Case Control command.

Parameter values from the Bulk Data Section are brought into the DMAP sequence via the IFP module.

Parameter values from case control are brought into the DMAP sequence via the PVT module. The PVT

module reads the case control PARAM commands and resolves parameter values specified in both the

Case Control and Bulk Data Sections.

Recommended Parameter Type Specification

Follow these recommendations to produce a more readable DMAP sequence where all Y parameters and

parameters with non-MPL defaults are specified on TYPE statements.

TYPEd and NDDL TYPEd and Not NDDL Not TYPEd

Last executed assignment statement or module output with "S,N," prefix or CALL statement output

with "S," prefix. The qualifier values for NDDL parameters cannot change.

Bulk Data PARAM entry override, if parameter is type Y and has not been previously reassigned in an

assignment (=) statement (unless the PVT module has been executed to reset the Bulk Data and Case

Control PARAM entries).

Value on the data base name=v

from its first occurrence in a

TYPE statement

Will cause UFM 439

NDDL default value TYPE statement default

NAME VALUE TYPE

ALWAYS -1 Integer

NEVER +1 Integer

TRUE TRUE Logical

FALSE FALSE *Logical

NOGO 0 Integer

Main Index

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