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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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How to analyse periodic data obtained from a vibration experiment?

I have data from a vibration experiment on a structure. This data was obtained by attaching an accelerometer to a FFT analyser, which records the data at a high sampling rate (typically in kHz range) and can also perform real-time FFT of the…
Chintan Pathak
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How can I measure the vibrations of a solid object?

I want to measure the vibrations of a solid object (a tuning fork, a bone conducting headphone, the chest during singing) and to isolate them from the vibrations of the air. So I am looking for a meter that will pick those vibrations only when it's…
OMGsh
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Units for vibration measurements

I am conducting research to determine vibration limits for cultural heritage objects (e.g. art, small sculpture, ceramics). The vibration source can be, for example, transport, construction in or next to a museum, or rock concerts in or next to a…
Gorman
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What are the unknown sources of vibration in this Rotax 914 propulsion system

(This might be a little out of score for SE.Engineering, so close if appropriate.) I have a drivetrain setup where I have been performing a vibration analysis. Below is a diagram of the system. There is a 4-cycle 4-cylinder Rotax 914 engine which…
Kenn Sebesta
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How to analyse results of vibration isolation test

I performed some tests with vibration isolators and have computed the PSD. The natural frequency of the isolators is 110 Hz in the axial direction. So my question is, should I expect to see noise damped below or above 110 Hz? Also should the natural…
lala
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Forced vibration of beam

I was watching a video that derives the forced vibration response of a beam. The link to the video is https://www.youtube.com/watch?v=6VuLZDgRhZ4&list=PLMXj6GKKnHI6Lftj7CXr9WusMkXi5s9yH&index=56 In the derivation, why is it correct to use the…
user402525
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Vibration damping a bed from mechanical vibrations

Note: I understand the very nature of this question is about gross approximations on an incredibly complex topic, but even educated 'guesstimates' would be very helpful I have already seen these two questions but i'm hoping with some provided data I…
myol
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Which kind/model of sensor is appropriate for detecting vibration at one end of 1000 m steel block?

We have to detect vibration/sound produced at rail track for upcoming train at 1000 m distances . So which sensor is appropriate here? thanks.
Masfiqur Rahaman
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Vibrations analysis 7x rpm

im monitoring an overhung pump 19kw . and it shows a high peak at 7x rpm . on Thrust Vertical DE of pump. what does it mean ?
Houssame Paco
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Applying modern control systems to real mechanical engineering problems

My aim was to damp the vibration of a stepper motor ( Nema 8 ) using only spring systems. I have taken modern control course and I wanted to apply it here. So I first analyzed my open loop system and found it to be highly unstable. I then used…
Socrates Gebremedhin
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How to measure the beat phenomenon in amplitude of vibration waveform?

I have time series of 3 signals, and I found the amplitude of vibration waveform would display the so-called beat phenomenon, which means the amplitude at different time is not always equal, and the beat envelope is also different. The time history…
WUYing
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How is the fundamental frequency of a large rotating body determined?

Okay, I understand that "large" is relative. I'm referring to the 60" diameter 5000 rpm counterrotating flywheels I've postulated in this question. When I was taking flying lessons in an 8KCAB Decathlon there was an RPM band (2000-2250 rpm) which we…
ehbowen
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frequency of oscillation of the disk

The mass m is suspended by a string from a disk circular homogeneous of mass mc and radius R, as illustrated in figure 24. The disk is restricted from rotating by a spring attached to it at a distance cr of its center of rotation. If mass m…
user35114
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"$\theta_A$" and "$J_A \theta_A$" in the opposite direction

The system represented in the figure is composed of two rigid assemblies articulated in two points and connected to several springs as indicated. Each beam segment weighs 2 kgf/m, and the 5 kgf weight is concentrated at the end F. The stiffness…
user35114
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Dynamic equilibrium equations

The system represented in the figure consists of a 2 kg pulley to which two springs and a rigid square with 10 kg/m are connected, which in turn is articulated at point B (System is in the xz plane). Dynamic equilibrium equations: Can someone…
user35114
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