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Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
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Rust prevention on metal tooling?
Mix the oil (10W-30/40 good quality) with WD-40 to spread it uniformly and ensure penetration everywhere. WD-40 evaporates in 30 days. Oil can stay in place for years (I protected the frame of a car this way with good results after 10 years outside storage). There are many commercially...- hessian
- Post #3
- Forum: Spacecraft engineering
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Heat distribution Problem
Why do you think 53C is hot for the chip case? Wimpiest commercial chips are designed to operate at max 70C case. NOTE: you are NOT measuring either the chip temperature or the case temperature if you are reporting the "heat-sink" (spreader_convector) temperature. How do you have it...- hessian
- Post #4
- Forum: Heat Transfer & Thermodynamics engineering
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BASIC MODELING
Timoshenko and Young, Vibration, (out of print but findable) has Timoshenko's derivation of solutions for continuous beams including rotation effects. It also allows you to compare the results between the two formulations (with/without). As I recall, the effect is quite small on the frequency...- hessian
- Post #11
- Forum: Mechanical Acoustics/Vibration engineering
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Shake test using applied force vs moment
Yes, in looking at optical point-track system stability in an aircraft external pod rocking-mode situation. It was easier to design a fixture with a pivot at one end and a pivot over the shaker head. Then translational shaker motion creates uniaxial rotary random motion, which input into the...- hessian
- Post #3
- Forum: Mechanical Acoustics/Vibration engineering
