1、ME 451Introduction to ADAMS/ViewVIRTUAL PROTOTYPING PROCESSBuild Test Review Improvecircle6 Build a model of your design using:circle6 Bodiescircle6 Forcescircle6 Contactscircle6 Jointscircle6 Motion generatorsBuild Test Review ImproveVIRTUAL PROTOTYPING PROCESScircle6 Test your design using:circle6
2、 Measurescircle6 Simulationscircle6 Animationscircle6 Plotscircle6 Validate your model by:circle6 Importing test datacircle6 Superimposing test dataBuild Test Review ImproveVIRTUAL PROTOTYPING PROCESScircle6 Review your model by adding:circle6 Frictioncircle6 Forcing functionscircle6 Flexible partsc
3、ircle6 Control systemscircle6 Iterate your design through variations using:circle6 Parametricscircle6 Design VariablesBuild Test Review ImproveVIRTUAL PROTOTYPING PROCESScircle6 Improve your design using:circle6 DOEscircle6 Optimizationcircle6 Automate your design process using:circle6 Custom menusc
4、ircle6 Macroscircle6 Custom dialog boxesCoordinate Systemscircle6 Definition of a coordinate system (CS)circle6 A coordinate system is essentially a measuring stick to define kinematic and dynamic quantities.Pcircumflexnosp circumflexnospx y zP P x P y P z= + +combarrowextenderarrowrightnosp circumf
5、lexnospcircle6 Types of coordinate systemscircle6 Global coordinate system (GCS):circle6 Rigidly attaches to the ground part.circle6 Defines the absolute point (0,0,0) of your model and provides a set of axes that is Coordinate Systemsreferenced when creating local coordinate systems.circle6 Local c
6、oordinate systems (LCS):circle6 Part coordinate systems (PCS)circle6 MarkersPart Coordinate Systemscircle6 Definition of part coordinate systems (PCS)circle6 They are created automatically for every part.circle6 Only one exists per part.circle6 Location and orientation is specified by providing its
7、location and orientation with respect to the GCS.circle6 When created, each parts PCS has the same location and orientation as the GCS.Markerscircle6 Definition of a markercircle6 It attaches to a part and moves with the part.circle6 Several can exist per part.circle6 Its location and orientation ca
8、n be specified by providing its location and orientation with respect to GCS or PCS.Markerscircle6 Definition of a marker (cont.)circle6 It is used wherever a unique location needs to be defined. For example:circle6 The location of a parts center of mass.circle6 The reference point for defining wher
9、e graphical entities are anchored.circle6 It is used wherever a unique direction needs to be defined. For example:circle6 The axes about which part mass moments of inertia are specified.circle6 Directions for constraints.circle6 Directions for force application.circle6 By default, in ADAMS/View, all
10、 marker locations and orientations are expressed in GCS.Difference between part and geometrycircle6 Partscircle6 Define bodies (rigid or flexible) that can move relative to other bodies and have the following properties:circle6 Masscircle6 Inertiacircle6 Initial location and orientation (PCS)Initial
11、 velocitiescircle6circle6 Geometrycircle6 Is used to add graphics to enhance the visualization of a part using properties such as:circle6 Lengthcircle6 Radiuscircle6 Widthcircle6 Is not necessary for most simulations.circle6 Simulations that involve contacts do require the part geometry to define wh
12、en the contact force.Difference between part and geometryCenter of Mass MarkerDifference between part and geometrycircle6 Dependencies in ADAMS/View cylmar_2Marker.mod.pend.mar_2Marker.mod.pend.mar_1Geometry.mod.pend.cylMarker.mod.pend.cmGeometry.mod.pend.sphPart.mod.pendModel.modmar_1cm sphCreating
13、 some partscircle6 Linkcircle6 Boxcircle6 SphereExtrusioncircle6circle6 Importing a geometry from CAD package. ParasolidConstraintscircle6 Definition of a constraintcircle6 Restricts relative movement between parts.circle6 Represents idealized connections.circle6 Removes rotational and/or translatio
14、nal DOF from a system.circle6 Jointscircle6 Revolutecircle6 Translationalcircle6 Fixedcircle6 Other _HMMWV Vehicle Modelcircle6 High Mobility Multipurpose Wheeled Vehicle (HMMWV) modeled in ADAMS/CarTrack ModelLets create some mechanismscircle6 Simple pendulumcircle6 Single body mass attached with a
15、 wirecircle6 wireismasslesscircle6 Two body mass attached to a linkcircle6 Link has masscircle6 Slider crankcircle6 Transfers power from piston-cylinder to shaft in a car enginecircle6 Transfers power in opposite direction when used as an air compressorcircle6 Application of this virtual prototyping
16、circle6 One can review forces coming on joints, and hence select appropriate bearingscircle6 Torques acting at the joints can be found and hence an appropriate motor can be Applicationsselected based on the operating speed and torque requirementscircle6 A controls module can be added and testedcircl
17、e6 All mass properties, geometries, operating speeds etc can be changed and their effects can be evaluatedWORKSHOP ONE DOF PENDULUMcircle6 Problem statementcircle6 Find the initial force supported by the pin at A for a bar that swings in a vertical plane, given the initial angular displacement (0) a
18、nd initial angular velocity (0). Also, find the pendulum frequency.WORKSHOP ONE DOF PENDULUMcircle6 Start the workshopcircle6 First, youll start ADAMS/View from a directory you can write files tocircle6 Last time I checked, ADAMS/View is in Course Softwarebarb2rightSupportedbarb2rightMD Adams Viewci
19、rcle6 To start ADAMS/View and create a model:Start ADAMS/View:circle6circle6 Set the directory to anywhere on one of your CAE hard drivescircle6 Create a new model named pendulum, with Gravity set to Earth Normal (-Global Y), and Units set to MMKS - mm, Kg, N, s, deg.WORKSHOP ONE DOF PENDULUMcircle6
20、 Build the pendulum linkNow, build the link section of the pendulum using the following parameters:circle6 Width: 20 mmcircle6 Depth: 27.5mmcircle6 Endpoints: (0, 0, 0) and (450, 0, 0)WORKSHOP ONE DOF PENDULUMcircle6 To build the link:1. Turn on the coordinate window.2. From the Main Toolbox, right-
21、click the Rigid Body tool stack, and then select the Link tool .3. In the container:rhombus6 Select New Part.rhombus6 Select Length, and in the Length text box, enter 450 mm, and then press Enter.rhombus6 Select Width, and in the Width text box, enter 20 mm, and then press Enter.rhombus6 Select Dept
22、h, and in the Depth text box, enter 27.5 mm, and then press Enter.4. Using the mouse, select 0, 0, 0 and 450,0,0 as the endpoint locations.circle6 Tip: Use the Location Event (right-click away from the model) to help select the endpoints. When you right-click, the Location Event appears in the lower
23、 left corner of the ADAMS/View window. Enter the coordinates for the link in the upper text box and then press Enter.WORKSHOP ONE DOF PENDULUMcircle6 Build the sphere sectionNext, build the sphere section of the pendulum using the following parameters:circle6 Add to Partcircle6 Radius: 25 mmcircle6
24、Centerpoint: 450, 0, 0WORKSHOP ONE DOF PENDULUMcircle6 To build the sphere section:1. From the Main Toolbox, right-click the Rigid Body tool stack, and then select the Sphere tool .2. In the container:rhombus6 Select Add to part.rhombus6 Select Radius, and in the Radius text box, enter 25 mm, and th
25、en press Enter.3. Using the mouse, select PART_2, which is the link, as the part to add to.4. Using the mouse, select 450,0,0 as the location.WORKSHOP ONE DOF PENDULUMcircle6 Rename the pendulumNow youll rename the pendulum from PART_2 to Pendulum.circle6 To rename the pendulum:1. Right-click the li
26、nk, point to Part:PART_2, and then select Rename.The Rename Object dialog box appears.2. In the New Name text box, enter .pendulum.pendulum, and then select OK.WORKSHOP ONE DOF PENDULUMcircle6 Set the mass of the pendulumcircle6 Now, set the mass of the pendulum to 2 kg, set all three inertias (Ixx,
27、 Iyy, Izz) to 0, and change the location of the center of mass.circle6 To set the mass of the pendulum:1. Right-click the pendulum, point to Part: pendulum, and then select Modify.2. Set Define Mass by to User Input.3. In the Mass text box, enter 2.0.4. In the Inertia text boxes (Ixx, Iyy, Izz), ent
28、er 0.5. Right-click the Center of Mass Marker text box, point to pendulum.pendulum.cm, and then select Modify.WORKSHOP ONE DOF PENDULUM6. In the Location text box, enter 450, 0, 0.7. Select OK in both dialog boxes.You will receive a warning in the Message Window concerning the change in position of
29、your center of mass marker.8. Select Close to close the Message Window.circle6 Your model should look like this (with shading turned on):circle6 Build the pivotcircle6 In this section, youll build the pivot by creating a revolute joint between ground and the pendulum at location A, as shown in the f
30、igure in Workshop 6, slide 3, and rename it Pivot.circle6 To build the pivot:1. From the Main Toolbox, right-click the Joint tool stack, and then WORKSHOP ONE DOF PENDULUMselect the Revolute joint tool .2. In the container, select 2 Bod-1 Loc and Normal to Grid.3. Select the pendulum as the first body.4. Select the ground as the second body.5. Select 0, 0, 0 as the location.Joint stack toolWORKSHOP ONE DOF PENDULUMcircle6 To rename the joint:1. Right-click the revolute joint, point to Joint:JOINT_1, and then select Rename.2. In the New Name text box, enter .pendulum.pivot, and then select OK.
