Efficient Computer Simulation Program for a General Class of Mechanical Systems

适用于一般机械系统的高效计算机仿真程序

• 批准号: 9160264
• 负责人: Jigien Chen
• 金额: $ 4.89万
• 依托单位: K & D Research
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-08-01 至 1993-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9160264&HistoricalAwards=false
• 关键词: Efficient; Computer; Simulation; Program; General

The existing computer programs for simulation of the motion of multi-body mechanical systems generally require excessive execution time for realistic systems and this renders them not suitable or inconvenient for use in design phase. Additionally, these programs do not have good provisions for common drive subsystems which often involve planar linkages or geared mechanisms. A dynamic formulation methodology based on the recognition that a large number of mechanical system can be modeled as consisting of an open loop chain or tree of bodies, which are the primary links of the system, and their drive subsystems, which together with the primary links always form local closed kinematic loops. The proposed research is to develop such a methodology that calls for the identification of independent generalized coordinates for the local closed loop through graph representation concept and kinematic analysis, the use of efficient recursive formalism for the primary chain or tree and the derivation of additional contributions from the local closed loops. It is anticipated that a user-friendly and computationally efficient program can evolve from this research and can be made commercially available to the public. The resulted program can enable mechanical system designers to perform effective simulation in the various design phases to reduce the design turn-around time and the design costs, and to improve the quality of design.

现有的模拟多体机械系统运动的计算机程序对于现实系统来说，通常需要过多的执行时间，这使得它们在设计阶段不适合或不方便使用。此外，这些方案没有很好地规定了通常涉及平面连杆机构或齿轮机构的普通驱动子系统。基于认识到大量机械系统可以被建模为由作为系统主要环节的开环链或树体及其驱动子系统组成的一种动态表述方法，它们与主要环节一起总是形成局部闭合的运动回路。提出的研究是开发这样一种方法，该方法要求通过图表示概念和运动学分析来识别局部闭环的独立广义坐标，使用有效的递归形式来确定主链或树，并从局部闭环中推导额外的贡献。预计从这项研究中可以发展出一种用户友好且计算效率高的程序，并可以向公众提供商业服务。该程序可以使机械系统设计人员在设计的各个阶段进行有效的仿真，以减少设计周转时间和设计成本，提高设计质量。