DESIGN OF CONSTRAINT LECTURE - PowerPoint PPT Presentation

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DESIGN OF CONSTRAINT LECTURE

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APPLICATION SYSTEM SIZE REQ D PRECISION Fiber Optics Meso Nano Optical Resonators Meso Nano Large array ... Grinding Optic Mounts Robotics Automotive ... – PowerPoint PPT presentation

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Title: DESIGN OF CONSTRAINT LECTURE


1
DESIGN OFCONSTRAINTLECTURE
2
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

3
Common coupling methods
Flexural Kin. Couplings Kinematic Constraint
Elastic Averaging Non-Deterministic
Kinematic Couplings Kinematic Constraint
Pinned Joints No Unique Position
Quasi-Kinematic Couplings Near Kinematic
Constraint
4
Perspective What the coupling designer faces
  • APPLICATION SYSTEM SIZE REQD 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)

5
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?!?!?!?!?

6
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
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