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Questions tagged [vibration]

Vibration of mechanical systems is a field studied by mechanical engineers and civil engineers

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Why are engine blocks so robust apart from containing high pressure?

Lately, I've been pondering why some engine blocks are so bulky, I always thought intuitively it was because they had to last a long time whilst containing thousands of combustion cycles but the more, I look into the reality of engine design that…
David Nolan
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Detailed dimensions of an aircraft engine compressor blade

I am working on rub-induced vibrations in compressor stages of aircraft engines. The work is carried out in partnership with a company, therefore there is a limited amount of it that could be published openly. Is it feasible to release open source…
Nicolas
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What type of ultrasonic transducer would be suitable for ultrasonic welding?

Project background: I am working on a project where i need to weld plastic using ultrasonic transducers. Problem: Since I'm still learning engineering, I have a hard time figuring out what all the factors are in order to choose the right…
vaid
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Is there a mechanical equivalent to a hi/low pass filter (as in electrical engineering)?

I have been wondering if there are certain media (for instance glass, air, foam, etc.) which are peculiar given their chemical composition and/or structure allowing them to filter out mechanical waves (examples include: sound, vibrations) of high or…
Marc Pelland
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Is a 3 Hz beat frequency from my neighbor's HVAC a sign of a malfunction?

I'm being annoyed by a pulsating hum which comes from my neighbor's HVAC system. I read up a little on the design of HVAC systems and I came to a tentative conclusion that what I'm hearing is a compressor being driven by an AC induction motor. A…
Metamorphic
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Can gravity be a driving force for a spring-mass system?

If a spring-mass system is undergoing free vibration (oscillating up and down), then does it imply that there is no gravity? My tutor always consider gravity when finding the Equation of Motion for such a system. But isn't gravity is an external…
Mason Z
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Modelling splashing water in FEA

I'm running an FEA on a vessel that has a "splashing water" effect with vibrations. The problem I'm really coming up against is what kind of Young's Modulus and Poisson's ratio to use for the fluids? - air and water. I have been successful in…
Mark
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How can I model or simulate motion caused by an internal vibrating motor?

I have a vibration motor contained in an object. The motor looks similar to this: When the motor is running, I want to simulate the movement of the container object that results from the vibration of the motor. I'm able to model the…
Geva Tal
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Are there standard vibration and shock specs for shipment of a product?

Suppose I want to ship my product via UPS, or whatever other professional carrier service. What vibration and shock forces should I design my product to withstand? And how can I effectively test my product against those forces?
Stephen Collings
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Three-phase versus single-phase operation of a generator

My generator (a Fermont MEP-803A, 4 cyl diesel, 10kW rated) can run in three distinct modes: Single-phase 120V, in which one terminal is hot, and another is neutral Single-phase 120V/240V, in which two terminals are hot, and another is neutral. The…
Diogenes Creosote
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How to prevent vibration loosening whilst maintaining adjustability?

I have some height-adjustment nuts screwed onto vertical threads to support my print-bed for a 3D printer. They are domed nuts and the aluminium build-plate sits on top of the domes, three holes in the plate align with the domes to hold the plate in…
jhabbott
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Measuring the road surface quality

First of all, excuse my little knowledge, I'm a computer programmer by trade and unfortunately have very little knowledge of physics, engineering, DSP but I'm willing to learn. I would like to measure the quality of a road surface when riding on it…
Johannes Weiss
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Aluminum vs Steel rivets/fasteners in a high vibration environment

What are the relative pros and cons between aluminum and steel fasteners when riveting together sheet aluminum (50XX or 60XX) when high amounts of vibration are anticipated? Assuming that the usual guidelines for sheet thickness, hole size and…
Green
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What level of vibration testing should I perform on my product?

I'm trying to determine a level of vibration testing I should perform on my product. I understand electrical stress/life testing and I'm looking for a mechanical equivalent. I have a DC motor running in my application that generates a certain level…
Captain Barnacles
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How do I conduct an experimental modal analysis with a three-axis accelerometer?

How can I compute the Frequency Response Function (FRF) if I use two three-axis MEMS accelerometer to measure the input excitation and output response? I have read from some books that the FRF can be computed as the ratio of response to excitation,…
ice_lin
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