1. Sean Dalton www.itsligo.ie/staff/sdalton Dalton.sean@itsligo.ie

2. Sample Mechanisms Design cases Machinery: Improvement of production rates by reducing inertia forces. Electro-Mechanical: Reduction of jamming in VCR Tape-loading mechanisms. Imroving throughput in photocopier paper-handling systems Automotive: To design suspension for improved handling and reduce tire wear. Aerospace: For the design compact landing gear that stow tightly within the fuselage Entertainment: To design roller-coasters to create specified G- forces Domestic appliances: Design of Kettle trip mechanism

3. COSMOS enables you to: Detect collision: Cosmos enables you to simulate the operation of a mechanism and to detect potential collisions between components. Evaluates forces: With Cosmos works you can determine the forces exerted on the various components and joints. This is useful for designing the components or bearings. Evaluate stresses: By transferring force results into Cosmos works FEA: The stresses exerted in components can be evaluated.

4. Motion Icons

5. Part Mode/Constraints In Cosmos motion parts may be either stationary (grounded) or moving. There are 3 types of constraint - Joints: Define a components freedom of movement in terms of rotary and linear degrees of freedom - Contacts: Thesed define the nature of component to component contact e.g. cams - Couplers: Define a motion relationship between two components

6. Constraints: Joints Unconstrained objects have 6 degress of freedom. 3 translational and 3 rotational. Applying constraints removes one or more of these degrees of freedom. The degrees of freedom which remain define the movement of a component.

7. Constraints: Contacts Contacts define the nature of contact between two objects. This may be - Curve to Curve contact is like roller following a cam - Point to curve contact is like a stylus following surface

8. Constraints: Couplers Couplers: define the relative motion between two without necessarily creating the physical components necessary to achieve this movement - Trans. Trans. Coupler: Defines the relative movement between two linear component movements. E.g. - Trans rot coupler: Defines he linear to rotation relationship for two components. E.g. Rack and Pinion - Rot Rot Coupler: Define the relative ratio of two rotation shafts. Spur or Bevel gear, Belt or chain drive.

9. Forces The forces section is used to apply: - Forces - Spring - Damping to a mechanism. to a mechanism. Each of these may be linear or torsional Each of these may be linear or torsional

10. Results In the result section regarding, displacements, velocities, accelerations and forces can be obtained and plotted.

11. Simulation paramaters In this section you can determine the duration and smoothness (frames per second) of a simulation. Paramaters are access by right clicking on the top of the feature manager tree.