MSC.NASTRAN DMAP编程指南：基础知识与实例

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本资源是关于MSC.NASTRAN的Dmap（Design Mapping）指南，由Mike Reymond编写，适用于MSC.Nastran 2001版本。NASTRAN是一款广泛使用的结构分析软件，而Dmap功能则是一种设计映射工具，用于将设计输入映射到计算模型中，以便进行精确的工程分析。该指南提供了程序员级别的详细指导，旨在帮助用户理解如何有效地利用Dmap来实现设计与分析之间的高效转换。内容涵盖了以下几个关键点： 1. 概述：指南首先介绍了MSC.Nastran 2001的基本背景，强调了Dmap在软件中的核心作用，即它能够简化设计数据与分析模型的交互过程，提高工作效率。 2. 作者与联系方式：指南的作者Mike Reymond代表的是MSC Software Corporation，一个全球领先的工程模拟软件提供商。指南提供了一系列的联系方式，包括美国、欧洲和亚洲太平洋地区的办公室电话和传真，以及公司的官方网站www.mscsoftware.com，方便用户获取最新的技术支持和更新信息。 3. 免责声明：在使用这份文档时，用户应注意到MSC Software Corporation保留在不通知的情况下修改规格和其他信息的权利。指南中的概念、方法和示例仅作教学和示范之用，非详尽无遗，也不作为解决特定工程问题或设计的官方指导。此外，公司明确声明不对因使用文档中的信息而导致的任何直接或间接损失承担责任。 4. 版权：用户文档的版权属于MSC Software Corporation，所有内容在美国印刷发行。这表明使用这份指南必须遵守版权法规定，不得擅自复制或用于商业目的。通过阅读这份指南，读者可以掌握Dmap的基本原理、工作流程、编程技巧和可能遇到的问题解决策略，这对于熟悉并熟练运用NASTRAN进行结构分析的工程师来说，是一份非常实用且重要的参考资料。在实际工作中，用户可以根据指南中的指导定制自己的设计映射规则，从而优化分析模型，提升工程项目的准确性和效率。

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Introduction

1.1 Introduction

MSC.Nastran DMAP (Direct Matrix Abstraction Program) is a high-level language

with its own compiler and grammatical rules. This section provides a summary

description of the MSC.Nastran DMAP language, rules, and syntax.

A DMAP program consists of a series of functional blocks called “modules,” each of

which has a unique name and a specific function. Modules are executed sequentially;

branching and looping operations are performed by DMAP control statements.

Modules communicate through the MSC.Nastran Executive System (NES) via logical

collections of data called “data blocks” and “parameters.”

Data blocks come in two distinct forms: “matrices” that obey the rules of matrix

algebra, and “tables” that represent a convenient collection of data items. Data blocks

are given arbitrary names (mnemonic names are recommended) andhaveheader and

trailer information defining their characteristics.

Parameters are scalar items used for specifying control, operation, or system

characteristics. Modules can use “input parameters,” “output parameters,” or both.

Input parameters affect the internal operation of the modules. Output parameters are

used to control DMAPlogic and/or to pass scalar information to subsequent modules.

Data blocks and parameters can be written onto either scratch or permanent physical

files. When the normal MSC.Nastran execution is completed, data blocks and

parameters written to scratch files are erased, and those written to the permanent

physical file are available for future use. The NDDL (MSC.Nastran Data Definition

Language) designates whether a data block is scratch or permanent. A detailed

description of the NDDL statements can be found in “NASTRAN Data Definition

Language (NDDL)” on page 697.

MSC.Nastran provides theuser with a variety ofprewrittensolutionsequences.These

solution sequences consist of a series of DMAP statements. MSC.Nastran allows the

user to modify prewritten solution sequences or to write his or her own solution

sequencesusing DMAP. The compilation, linkage,and executionofa DMAP program

isspecifiedbyexecutivecontrol statementsinthe input file. Thecreation ofandaccess

to databases is specified by file management statements also contained in the input

file. File management statements are described in the“File ManagementStatements”

in Chapter 2 of the MSC.Nastran Quick Reference Guide.

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