1. Mechanical Engineering Dept.
Degrees of Freedom
Any component that is unconstrained in space has six degrees of freedom.
Translation – movement along X, Y, and Z axis (three degrees of freedom)
Rotation – rotate about X, Y, and Z axis (three degrees of freedom)
Ken Youssefi
Mechanical Engineering Dept.

2. Mechanical Engineering Dept.
Joints
A mechanism is a mechanical portion of a machine that is responsible for transferring motion, force, and torque from an input source to an output source. A mechanism consists of linkages and joints. Links are considered rigid parts. Joints are movable connections between links and allow relative motion between links.
The Revolute joint (pin or hinge joint) - one degree of freedom
It allows pure rotation between the two links that it connects (R joints)
Ken Youssefi
Mechanical Engineering Dept.

3. Mechanical Engineering Dept.
Joints
The Sliding joint (prism or piston joint) - one degree of freedom
It allows linear sliding between the two links that it connects (P joint)
Ken Youssefi
Mechanical Engineering Dept.

4. Mechanical Engineering Dept.
Joints
The Helical joint (helix or screw joint) - one degree of freedom
The sliding and rotational motions are related by the helix angle of the thread (H joint)
Ken Youssefi
Mechanical Engineering Dept.

5. Mechanical Engineering Dept.
Joints
The Cylindrical (cylindric) joint - two degrees of freedom
It permits both angular rotation and an independent sliding motion (C joint)
Ken Youssefi
Mechanical Engineering Dept.

6. Mechanical Engineering Dept.
Joints
The Spherical (spheric) - Three degree of freedom
It permits rotational motion about all three axes, a ball-and-socket joint (S joint)
Ken Youssefi
Mechanical Engineering Dept.

7. Mechanical Engineering Dept.
Joints
The Planar (flat) - Three degree of freedom
It permits rotational motion about the Z axes axis and sliding motion in x and y axes (F joint), used seldom in design
Ken Youssefi
Mechanical Engineering Dept.

8. Mechanical Engineering Dept.
Joints
A cam joint allows both rotation and sliding between two links.
A gear connection also allows both rotation and sliding as the gear teeth mesh
Ken Youssefi
Mechanical Engineering Dept.

9. Mechanical Engineering Dept.
Motion Analysis
In general, there are two types of motion analysis that should be performed to check the design.
Kinematics: deals with the study of motion without regard for the forces that cause the motion. The analysis provides information about the position, velocity and acceleration of all links.
Kinetics: deals with the action of forces on the mechanism. It provides information about the forces at the joints and the required input torque.
Ken Youssefi
Mechanical Engineering Dept.

10. Mechanical Engineering Dept.
Motion Analysis
The process of analyzing the motion of a mechanism.
Geometric modeling of all parts and creating an assembly model of the mechanism with proper mates.
Generate the motion model:
Define ground (fixed) components
Define moving components
Define joints and connections
Specify driver(s) component
Specify loads; external loads, body force (gravitational)
Perform motion analysis
Ken Youssefi
Mechanical Engineering Dept.

11. Mechanical Engineering Dept.
Motion Analysis
Results visualization (post-processing)
Graphs – study the position, velocity, and acceleration of any link or any point on a given link
Animation – check the overall motion and interference
Prepare reports – graphs and charts
Query – results at specific locations for a given time
AVI and VRML – convert the motion to an AVI or export animations to VRML format for distribution on the Internet
Ken Youssefi
Mechanical Engineering Dept.

12. Mechanical Engineering Dept.
Motion Analysis
Tools → Add-Ins and check SolidWorks Motion or COSMOSMotion
2008
2009/10
Ken Youssefi
Mechanical Engineering Dept.

13. Mechanical Engineering Dept.
Motion Analysis
Animation option creates simple animations based on point to point motion of parts in assemblies. Motor could also be used.
Basic Motion option approximates the effects of Motors, Springs, Collision and Gravity on assembly. This is a physics based simulation
Motion Analysis combines motion study elements with mates in motion. It also calculates loads that can be used in finite element analysis.
Select Motion Study 1
Ken Youssefi
Mechanical Engineering Dept.

14. Motion Analysis - Toolbar
Ken Youssefi
Mechanical Engineering Dept.

15. Motion Analysis - Toolbar
Ken Youssefi
Mechanical Engineering Dept.

16. Mechanical Engineering Dept.
Motion Analysis - Toolbar
Ken Youssefi
Mechanical Engineering Dept.

17. Mechanical Engineering Dept.
Motion Analysis - Toolbar
Filter Selected, shows only the selected items
No Filter, shows all items
Filter Results, shows only simulated result items
Filter Driving, shows only the items that cause motion
Filter Animated, shows only the moving items
Ken Youssefi
Mechanical Engineering Dept.

18. Mechanical Engineering Dept.
ground
9 in
7 in
Ken Youssefi
Mechanical Engineering Dept.

19. Mechanical Engineering Dept.
Motor Selection
Select Motor type
Choose the driver, Motion type and specify speed
Ken Youssefi
Mechanical Engineering Dept.

20. Mechanical Engineering Dept.
4-Bar in motion
Ken Youssefi
Mechanical Engineering Dept.

21. Results of Motion Analysis – 4 Steps
Select a category
Select a sub-category
Ken Youssefi
Mechanical Engineering Dept.

22. Results of Motion Analysis
Select a result component
Select a component, 9 in. bar. You can also select a face, an edge, a vertex, or a mate
Ken Youssefi
Mechanical Engineering Dept.

23. Results of Motion Analysis
Ken Youssefi
Mechanical Engineering Dept.

24. Results of Motion Analysis
Plotting the angular velocity of the 9 in. link against the angular displacement of the 2 in. link (input)
Ken Youssefi
Mechanical Engineering Dept.

25. Mechanical Engineering Dept.
Force Analysis
Force
Ken Youssefi
Mechanical Engineering Dept.

26. Mechanical Engineering Dept.
Path Analysis
Ken Youssefi
Mechanical Engineering Dept.

27. Mechanical Engineering Dept.
Disable Orientation and Camera Views
Ken Youssefi
Mechanical Engineering Dept.

28. Motion Analysis – Slider Crank Mechanism
Slider-Crank components, each made in separate files.
Bearing
Slider (piston)
Crank
Pin
Connecting rod

29. Assembled Slider-Crank Mechanism
The next two mates assemble the piston to the pin, allowing the piston to rotate about the pin
The next two mates assemble the rod to the crank
The first three mates assemble the crank to the fixed bearing and the Right plane
The last mate eliminates rotation and allows only translation between ground (Top plane) and the piston

30. Animation Wizard
Create simple animations automatically: rotate model about any axis, Explode and collapse model

31. Animation Wizard
Explode
Collapse
Rotation

32. Animation Wizard

33. Mechanical Engineering Dept.
Fixing or Floating Components in Assembly
“f” stands for fixed component
Right click the component to change it from fixed to float
“-” stands for moving component
Ken Youssefi
Mechanical Engineering Dept.

34. Mechanical Engineering Dept.
2 in link is fixed and 7 in link is the driver
Ken Youssefi
Mechanical Engineering Dept.

35. Mechanical Engineering Dept.
Hinge Mate
Ken Youssefi
Mechanical Engineering Dept.

36. COSMOSMotion – Joints, 2007/8 SW
Ken Youssefi
Mechanical Engineering Dept.

37. Mechanical Engineering Dept.
COSMOSMotion
Straight line mechanism
Each rod drawn in a separate file and assembled using various mates. All connections are pin joints (Revolute).
Ken Youssefi
Mechanical Engineering Dept.

38. Mechanical Engineering Dept.
Straight line mechanism
Ken Youssefi
Mechanical Engineering Dept.

39. Mechanical Engineering Dept.
Ken Youssefi
Mechanical Engineering Dept.

40. COSMOSMotion - IntelliMotion
At the top of the FeatureManager, select the Motion tab
Select IntelliMotion option
Set units
Select force and time units, mass and length will be set automatically according to your selections
    .
Ken Youssefi
Mechanical Engineering Dept.

41. COSMOSMotion – IntelliMotion (gravity)
Specify the magnitude and direction in which gravity acts
This means that a vector of 0,-1, 0 defines the direction
Ken Youssefi
Mechanical Engineering Dept.

42. IntelliMotion – Moving and Ground Components
Select and drag over
Designate the moving and fixed components
Ken Youssefi
Mechanical Engineering Dept.

43. IntelliMotion – Joints
Mates specified during assembly will be displayed. You can add or modify joint type.
Linear or torsion spring can be included
Ken Youssefi
Mechanical Engineering Dept.

44. IntelliMotion – Motion
Select input motion type
Select the driver joint
Select the velocity function
Specify velocity value
Ken Youssefi
Mechanical Engineering Dept.

45. IntelliMotion – Simulation
Select duration and the number of frames.
Start the simulation
Warning – motion not completed due to mechanism discontinuity
Ken Youssefi
Mechanical Engineering Dept.

46. IntelliMotion – Animation
Check for interference
Create and save the animation in the AVI format
Ken Youssefi
Mechanical Engineering Dept.

47. Mechanical Engineering Dept.
Motion analysis
Linear velocity of any point could be graphed
Path of any point on the mechanism could be traced
Ken Youssefi
Mechanical Engineering Dept.

48. Motion analysis - Velocity
Select component and a point on the component to measure velocity
Display the graph
Ken Youssefi
Mechanical Engineering Dept.

49. Motion analysis – Position of Components
An angular displacement between any two components could be plotted.
Ken Youssefi
Mechanical Engineering Dept.

50. Motion analysis – Select Motor
Rotary Motor
Linear Motor
Ken Youssefi
Mechanical Engineering Dept.

51. Motion analysis – Apply Forces
Ken Youssefi
Mechanical Engineering Dept.

52. Motion analysis – XY plots
Ken Youssefi
Mechanical Engineering Dept.

53. Mechanical Engineering Dept.
Motion analysis – NX5
Select Motion Simulation module
Type of joints
Ken Youssefi
Mechanical Engineering Dept.

54. Mechanical Engineering Dept.
Motion analysis – NX5
First select the Solution and then the Solve option
Ken Youssefi
Mechanical Engineering Dept.

55. Mechanical Engineering Dept.
Motion analysis – NX5
Ken Youssefi
Mechanical Engineering Dept.

56. Mechanical Engineering Dept.
Motion analysis – NX5
Ken Youssefi
Mechanical Engineering Dept.

57. Mechanical Engineering Dept.
Potato cutter (french fries)
Main body
Ken Youssefi
Mechanical Engineering Dept.

58. Mechanical Engineering Dept.
Chrome handle
Plastic handle
Side bar
Red slider
Ken Youssefi
Mechanical Engineering Dept.

59. Mechanical Engineering Dept.
Cutting blade
Pusher
Chrome back plate
Clamp
Ken Youssefi
Mechanical Engineering Dept.

60. Mechanical Engineering Dept.
After creating assembly model, select Motion Simulation module from the Start menu
Ken Youssefi
Mechanical Engineering Dept.

61. Mechanical Engineering Dept.
Select Driver Type
Assign a driver, right click on joint j006 and select Edit
Select Constant and specify velocity (deg/sec)
Ken Youssefi
Mechanical Engineering Dept.

62. Mechanical Engineering Dept.
After assigning the driver, select Solution and then select Solve
Ken Youssefi
Mechanical Engineering Dept.

63. Mechanical Engineering Dept.
Select Animation
Ken Youssefi
Mechanical Engineering Dept.

64. Mechanical Engineering Dept.
Select 2nd body
Interference Check
Select Type of detection
Select 1st body
Ken Youssefi
Mechanical Engineering Dept.

65. Mechanical Engineering Dept.
Check Interference and Pause on Event
Just before interference
Ken Youssefi
Mechanical Engineering Dept.

66. Motion analysis – NX5 (example)
Ken Youssefi
Mechanical Engineering Dept.