DESIGN OF CONSTRAINT LECTURE

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Presentation transcript:

DESIGN OF CONSTRAINT LECTURE

Design of constraints in precision systems Background History Reasons Requirements Problems Classes of Constraint Kinematic Quasi-Kinematic Variable Geometry Partial/Compliance Hardware/discussion time Elastic Averaging will be done next lecture

Common coupling methods Elastic Averaging Non-Deterministic Pinned Joints No Unique Position Kinematic Couplings Kinematic Constraint Flexural Kin. Couplings Kinematic Constraint Quasi-Kinematic Couplings Near Kinematic Constraint

Perspective: What the coupling designer faces… APPLICATION SYSTEM SIZE REQ’D PRECISION Fiber Optics Meso Nano Optical Resonators Meso Nano Large array telescopes 60 ft diam. Angstrom Automotive 3 ft 1 micron Problems due to strain affects Thermal Affects Air, hands, sunlight Gravity Sagging Stress Relief Time variable assemblies Loads Stiffness Problems due to sub-optimal designers Competing cost vs performance Automotive (no temperature control, large parts, resistance to change)

General service requirements & applications Ideal couplings: Inexpensive Accurate & Repeatable High Stiffness Handle Load Capacity Sealing Interfaces Well Damping Example Applications: Grinding Optic Mounts Robotics Automotive Sensitivity What are the sensitive directions?!?!?!?!?

Couplings are designed as systems You must know what is going on (loads, environment, thermal)! Shoot for determinism or it will “suck to be you” Coupling System Force Disturbance Displacement Material Property Geometry Inputs Desired Outputs Desired Location Actual Outputs Actual Location Error Kinematics Others