1 / 6

DESIGN OF CONSTRAINT LECTURE

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.

jcilley
Download Presentation

DESIGN OF CONSTRAINT LECTURE

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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… • APPLICATIONSYSTEM SIZEREQ’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)

  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. Geometry Disturbance Material Property Disturbance Displacement Disturbance Coupling System Kinematics Material • Inputs • Force • Displacement • Desired Outputs • Desired Location Geometry Others Force Disturbance Error • Actual Outputs • Actual Location 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”

More Related