SolidWorks运动仿真培训

COSMOSMotion 运动仿真培训COSMOSMotion 2008

Image courtesy of National Optical Astronomy Observatory, operated by the Association of Universities for Research in Astronomy, under cooperative agreement with the National Science Foundation.

About this course关于本课程 Prerequisites前提条件

Course Design Philosophy课程设计原理 Using this book本书使用方法 A note about files配套光盘说明 Conventions used in this book本书中采用的原理 Class Introductions课程介绍

© 2007 SolidWorks Corp. Confidential.

Design Validation Products设计仿真产品COSMOSWorksAdv. Professional DesignerStatic

ProfessionalVibration & Buckling Thermal Drop Test Nonlinear

COSMOSFloWorks Flow Simulation

Fatigue

Optimization

COSMOSMotion

Post-dynamics

COSMOSEMS Electromagnetic

© 2007 SolidWorks Corp. Confidential.

What is Motion Simulation 什么是运动仿真? Study of moving systems or mechanisms

运动系统或机构研究Motion of a system is determined by 运动系统定义：– Mechanical joints connecting the parts 零件的机械连接 – The mass and inertia properties of the components 部件的质量和惯性特性 – Applied forces to the system (Dynamics) 系统的作用力(动力学) – Driving motions (Motors or Actuators) 驱动运动(运动或致动器) – Time 时间

© 2007 SolidWorks Corp. Confidential.

Mechanism types机构类型 Kinematic System运动学系统– Movement of part(s) under enforced or constrained motion

外加或强制运动下的部件动作– Fully controlled and only one possible motion result irrespective of force and mass

不考虑力和质量的全约束和单一运动的结果– Zero degree of freedom

零自由度

Dynamic System动力学系统– Movement of part(s) under free motion subject to forces

自由运动物体与力作用下的零件运动– Partially controlled and infinite number of results depending on forces

依赖于力 的部分约束和无限数量的结果– Greater than zero degrees of freedom

自由度数大于零© 2007 SolidWorks Corp. Confidential.

Understanding Basics运动基础 Mass and Inertia质量和惯性– Newton’s First Law牛顿第一定律 – Conservation of momentum动力守恒

Degrees of freedom自由度– Rigid body刚性物体 – Grounded parts固定零件 – Moving parts运动零件

Constraints约束– Restrictions placed on a part’s movement in specific degrees of freedom

作用在零件运动上的特定自由度的限制– Mechanical joints are connections that restrict the movement of one part to another

yx

Pendulum restrained to pivot about mounting point

– 机械关节是约束零件相互运动的连接

Joint motion运动副 Gravity重力© 2007 SolidWorks Corp. Confidential.

Constraint Mapping约束映射 Mapping of SolidWorks assembly mates (constraints) to COSMOSMotion joint

s.

映射SolidWorks装配体配合(约束)为 COSMOSMotion的运动副 100+ ways of defining SolidWorks mates.

100多种定义SolidWorks配合的方法 Basic constraint types are merged to simplified mechanical joints.

基础约束类型合并为简化的机械约束– One Orthogonal Concentric mate in SolidWorks becomes a Concentric joint.

– 一个正交同轴配合转化为同轴副One Coincident and One Orthogonal Concentric mates in SolidWorks becomes a Revolute joint.

– 一个重合和一个正交同轴配合转化为一个转动 副One Point to Point coincident mate in SolidWorks becomes a spherical joint© 2007 SolidWorks Corp. Confidential.

– 一个点对点重合配合转化为一个球副。

约束映射 什么是约束映射?

是指在2个指定的零件之间，自动地、智能的将装配关系 转化为最小的机构运动幅的形式。基本的约束类型可以合并为 简单的机构运动幅，例如e.g. 1 coincident joints becomes a planar joint2 orthogonal coincident joints becomes a translational joint 3 orthogonal coincident joints becomes a fixed joint 1 Coincident and 1 orthogonal concentric becomes a revolute joint

所有的装配约束被映射为连接，包括曲面和曲面的约束 (如： 圆柱面/平面相切、圆柱面/圆柱面相切) 。这些是共有的连接 。© 2007 SolidWorks Corp. Confidential.

映射的约束SW Geometry Point Point Point Point Point Point Point Point Line Line Line Line Line SW Geometry Point Point Line Line Plane Plane Cylinder Cylinder Line Line Line Line Line 装配关系 重合 距离 重合 距离 重合 距离 重合 同轴 重合 距离 角度 平行 垂直 运动约束 PointPoint PointPointDist PointLine PointLineDist PointPlaneDist PointPlaneDist PointLineDist PointLine LineLine LineLineDist LineLineAng LineLineAng (0 deg.) LineLineAng (90 deg.)

注: SolidWorks 中 有100多种零件 约束的方式

© 2007 SolidWorks Corp. Confidential.

Line Line Line Line Line Line Line Plane Plane Plane Plane Plane Plane Cylinder Cylinder Cylinder Cone© 2007 SolidWorks Corp. Confidential.

Plane Plane Plane Plane Cylinder Cylinder Cone Plane Plane Plane Plane Plane Cylinder Cylinder Cylinder Cone Cone

COINCIDENT DISTANCE PARALLEL

LinePlaneDist LinePlaneDist LineLineAng (0 deg.)

PERPENDICULAR LineLineAng (90 deg.) COINCIDENT TANGENT COINCIDENT COINCIDENT DISTANCE ANGLE PARALLEL LineLineDist LineCylTan LineLine PlanePlaneDist PlanePlaneDist LineLineAng LineLineAng (0 deg.)

PERPENDICULAR LineLineAng (90 deg.) TANGENT CONCENTRIC TANGENT CONCENTRIC CONCENTRIC PlaneCylTan LineLine LineCylTan LineLine LineLine

计算机如何进行运动分析？ 程序在每一个时间步都应用修正的Newton-Raphson迭代法进 行运算 采用很小的时间步，软件就会预测零件相对于原始条件或当前 时间步的下一个时间步的位置

仿真求解必须满足以下要求：零件的速度

零件间的配合关系 力和加速度 结果会一直迭代计算直到达到该时间步上的力和加速度值的 某一精度为止。© 2007 SolidWorks Corp. Confidential.

运动副基础知识(1)Revolute铰接副 Cylindrical圆柱副

方向构件1

构件2

原点

约束2个旋转，3个移动自由度

约束2个旋转，2个移动自由度

© 2007 SolidWorks Corp. Confidential.

运动副基础知识(2)Translational 移动副方向

Spherical球形副

y-axis

x …… 此处隐藏：3446字，全部文档内容请下载后查看。喜欢就下载吧 ……