adams lecture 1 introduction to adams

8/3/2019 ADAMS Lecture 1 Introduction to ADAMS

1/19

Introduction to ADAMS

1


2/19

Multi-Body Analysis

The analysis and simulation of mechanical systems Systems can consist of rigid or flexible bodies

Bodies are assembled using rigid joints or flexibleconnections

System elements such as springs and dampers canbe nonlinear

The mechanisms can move through largedisplacements

Automatic formation and solution of equations ofmotion

Animated and plotted presentation of results

2


3/19

MSC ADAMS Background

MSC Software develop and maintain theADAMS software

ADAMS (Automatic Dynamic Analysis ofMechanical Systems)

Analysis Types

Kinematic

Static

Quasi-static

Dynamic

3


4/19

ADAMS Simulation Examples

4Videos from MSC.ADAMS Support Files

Cam Follower.wmv

Five Bar Linkage.wmvFork Lift.wmv

Suspension.wmv


5/19

Modelling Process

5

MODELLING

PREPROCESSING

ANALYSIS

POSTPROCESSING

Breakdown of a real world scenario intoa state suitable for ADAMS modelling

Generation of the model in a relevantcode to import into the software

With the imported model, setup therequired analysis type to replicatethe desired real world scenario

Process and analyse the results ofthe simulation


6/19

Double Wishbone SuspensionModel

6

Aston Martin DoubleWishbone Suspension

2D ADAMS Modelof a DoubleWishbone

Suspension

3D ADAMS Modelof a DoubleWishbone

Suspension


7/19

2D Suspension Model Parts(Modelling)

7

02

05

01

06

02

03

04

04

03

07

x

y

01

PART ID.

POINT NO.

GROUND


8/19

2D Suspension Model Markers(Modelling Continued)

8

02

05

01

06

02

03

04

04

03

07

01

0404

0407

0107

0402

0302 0301

0406 0206

0403

0205

0101

0105


9/19

Ground, Parts and Markers(Modelling Continued)

9

Ground A part which cannot move

Attaching other parts to the ground fixes their position

e.g. PART/01,GROUND

Parts Defines individual parts of the system e.g. upper wishbone

Each part has to have a centre of mass (CM), mass (MASS)and inertial properties (IP) defined

e.g. PART/02,CM=0200,MASS=1,IP=1,1,1

Markers Defines points on the parts

Each marker has to have its position defined (x, y, z)

e.g. MARKER/0200,QP=0.42,0.68,0


10/19

2D Suspension Model Joints(Modelling Continued)

10

x

yy

y

y

x

x

x

CYL

REV

REVSPH

MOTION

Degree of Freedom (DOF) can be Calculated


11/19

Joints (Modelling Continued)

11

Joints

Joints are required to connect two parts together

Each joint needs to have two marker to define it (the twomarkers need to be from separate parts)

Some joints need to have their markers aligned correctly inorder to work properly

e.g. JOINT/01,REV,I=0301,J=0101

Spherical JointRevolute Joint Cylindrical Joint

Revolute Joint.wmv Ball Joint.wmvCylindricalJoint.wmv


12/19

adm File Generation(Postprocessing)

12


13/19

Imported Model (PostprocessingContinued)

13


14/19

Simulation Motion (Analysis)

14

30 d

-30 d

1.0 TIME (S)0.5

Motion Statement The motion of a model needs to be defined within the adm file

A motion has to be applied to a joint and given a value

MOTION/01,JOINT=01,ROTATION,FUNCTION=-30D*SIN(TIME*360D)


15/19

Simulation (Analysis Continued)

15

Simulate Model Length 1 seconds (End Time)

Steps 40 (Steps)

Data output every 0.025 second


16/19

Complete 2D SuspensionModel Simulation

16

2d-susp.wmv


17/19

Review Results (Postprocessing)

17


18/19

2D Suspension Model Results

18


19/19

Completed Pendulum Model

19

adams lecture 1 introduction to adams

Documents