Vibration Definition and 429 Threads

Homework Statement An air compressor of mass m1 = 150 kg is mounted on a spring of stiffness k1= 3000 N/m. The measured displacement amplitude X1 = 0.0002 m at the operating speed of N = 1800 r/min. If an undamped isolation system with mass m2=12 kg and a natural frequency w2 = 105 rad/s...

Could someone tell me what are the factors needed to be looked into before selecting Anti-vibration mounts. Regards.

If water is hold inside the water bottle, which is made of plastic, and I play music within the room, can the sound vibration get through the plastic bottle and transfer it into water? Does anyone have any suggestions on what kind of materials to hold the water to get the best transfer rate on...

Homework Statement A mass of 0.3kg is suspended from a spring of stiffness 200Nm-1. If the mass is displaced by 10mm from its equilibrium position and released, for resulting vibration, calculate: a) the maximum velocity of the mass during the vibration Homework Equations Angular...

Homework Statement A mass of 0.3kg is suspended from a spring of stiffness 200Nm-1. If the mass is displaced by 10mm from its equilibrium position and released, for resulting vibration, calculate: a) the frequency of vibration b) the maximum velocity of the mass during the vibration c) the...

I developed a COMSOL model and calculated the first 6 modes of vibration of cantilever beam. Later out of curiosity, I looked up some videos on youtube to see actual cantilever. I found this video which shows the first mode. How do you know that its first mode of vibration? More...

Vibration is energy. "Energy flows, where the attention goes." by Unknown How do your thought change the outcome of reality (vibration)? What media do we express vibration? in sound wave or other format? Does anyone have any suggestions? Thanks in advance for any suggestions...

Someone tells me that every objects has its own vibration, such as stone, water ... When bee is flying, the sound of vibration can be heard at different speed, bbbbbbb ... but not all vibration can be heard by us. Does anyone have any suggestions on what kinds of device can measure...

Homework Statement https://www.physicsforums.com/attachment.php?attachmentid=39373&stc=1&d=1317244721 Homework Equations In all honesty I am not sure? The Attempt at a Solution This question was used as a worked example in my first tutorial for Dynamics. The lecturer didn't break it down...

I was reading "The physics of superheroes", and it mentioned The Flash being able to increase his kinetic energy to tunnel though walls. I tried to find out how fast he would have to go, assuming he is vibrating (as shown in the actual comic) so will have several tries at trying to tunnel though...

Hi ! I need your help ! I have been kind of stuck with the following problem for a few days : I made measurements on a plate radiating sound with an accelerometer and I found very low values of displacement(1-10 pm !). It seems very very very low (less than 1 atom !) Depending on the...

1. Does the amplitude of a pendulum's vibration have effect on its' frequency? 2. F prop. to L or F prop to 1/Square root L where L is length and F is frequency. 3. Absolute Failure. Cannot Re-Do experiment due to lack of equipment.

Do photons vibrate or oscillate in any way?

I am reading a vibration sensor manuvall that always written in units of "g". what is the meaning of that g. Can some explain me. The document is down here.

I have searched on web but i did not get exact explanation on about these topics. Could someone clear me. I am looking for accelemeter to my pump that can get the information about vibrations.

I have built a 3' by 4' hovercraft (with rounded corners) out of plywood with a pond liner bag skirt. it it powered by either 2 battery operated leaf blowers or 1 plug in electric leaf blower. I have encountered a problem with both power sources. The hovercraft makes a loud vibrating noise...

Hello, I am currently in the process of writing an Extended essay on the the "Effect of Tension on the fundamental Vibration of a circular Membrane" I have already completed the practical side of this by making 5 diaphragms with a 3 micron thick mylar membrane and have written up the methods...

What is “undamped vibration absorption” ? What is “undamped vibration absorption” and how would you use this concept to absorb the vibration of a un-damped, simple mass spring system of mass m and stiffness k oscillating at its resonance frequency?

A violinist places her finger so that the vibrating section of a 1.0g/m string has a length of 30cm, then she draws her bow across it. A listener nearby in a 20 degrees celcius room (speed of sound at this temperature in air is 343 m/s) hears a note with a wavelength of 40 cm. What is the...

Hi All, First time poster on physics forums, but have been looking around for a while now. Very helpful site. I'm currently undertaking a final year Mech Eng project studying the feasibility of installing a pendulum type vibration absorber onto small scale AC induction motors (1-2kw)...

Hi, I am trying to reduce the error in the controller for a stewart platform. At the moment I am trying to experiment with estimating the transfer function of the error, and applying the inverse of the transfer function to the input data. I have an input file sampled at 50hz of...

Hi, I am currently doing an experiment to determine the the viscous damping coefficient (c) of a dashpot. Where you move the position of the damper to determine the effect of the damping but my results show that when the damper is closer to the pivot the damping increases but i thought the...

Just a short question. As part of a dyno project, I am coupling two dc motors together with a timing belt. To allow the same rig to be used for different test motors, I am considering mounting this (test) motor on a table, which can be positioned in two directions on leadscrews. This would...

I just wantedhow the atoms vibrate in solids. I do not want to know the reason of their vibration (I know it). I just want to know their pattern of vibration. Some people say that they vibrate by undergoing a to and fro motion. But I do not think it is true because the objects are three...

Hi All, I have a thought that I had a while ago and wanted some advise/feedback etc My thought was as follows: All atoms have their own specific vibration, if one was able to match this vibration or its oppisite then the bonds that hold this atom together would break apart. Kind of...

Homework Statement Hello, I did the following measurement: A piezo element (mass approx. 50 gram) is fixed onto a vibration shaker The force exert on the piezo, 0,124 N (rms) is measured with an impedance head The vibration frequency (sinusoidal signal) is 142,4 Hz The acceleration is...

1.I am busy with an assignment based on a Vibration experiment in a Mechanical Engineering degree program The procedure is documented in the lab handout and one part is to compare the measured natural frequency to the calculated natural frequency The formula given in the handout for natural...

Hi, everyone. I'm required to complete an open ended analysis of the following problem: http://imagefrog.net/show.php/146581_image.png http://imagefrog.net/show.php/146581_image.png I'm not requesting a solution, I'm only looking for assistance in relation to determining the spring stiffness...

I wish to dampen a boom arm, which at its fixed point is connected to a vehicle (arm length is 5m long). The boom is 'L shaped' is attached to the to of the vehicle and extends 5m in the horizontal, then the second leg hangs down 5m, almost to the ground. The end of the boom arms contains lead...

Homework Statement :[/B] BoB released from rest, L = 102 cm, theta = +-5 degrees, g = 9.81 m/s2 assume a SHM (I) Determine the angle theta after 1.6 s (II) Determine the magnitudes of velocity & acceleration of the BoB at 1.6 s Homework Equations theta = A sin (w t + phai) The...

1. Homework Statement : BoB released from rest, L = 102 cm, theta = +-5 degrees, g = 9.81 m/s2 assume a SHM (I) Determine the angle theta after 1.6 s (II) Determine the magnitudes of velocity & acceleration of the BoB at 1.6 s Homework Equations theta = A sin (w t + phai) The...

Place a guitar floating in the vacuum. Once one string start to vibrate it would not stop since there is no air and contact. So any object vibrating in the vacuum would continue to vibrate indefinitely or the energy would become heat and radiation?

Hello, I am a student making a generator. the main idea is to use the vibration with the magnet coil setting with the spring to generate electricity. I will use the permanent magnet, but i know that e = N w B A i decided to have a 12Volt output, constant vibration frequency in 100Hz the A...

vibration problem! Homework Statement Question:There is a fixed end beam PQ. It is carrying a motor M. The motor is unbalanced and when the motor is rotating ,it is making the beam to vibrate with a frequency equal to the speed of the motor. A small mass is kept at point A just above the...

I have a motor driving a gearbox. I had DE bearing of the gearbox replaced recently as pitting in the inner race was found. Before re coupling the two units, I had the motor vibration checked and found to have satisfactory vibration levels in horizontal, vertical and axial directions. After the...

Homework Statement I have a under-damped vibration equation (below) that plots displacement vs time graph. Thing is i need to plot an envelope of the graph and it has to take into account initial speed v0. Homework Equations 1. Equation which plots displacement vs time. x(t)=exp^(-zeta*Wn*t) *...

Hi all, My fellow students and i are working on a university project. We are making a fixture and doing some vibration testing. We purchased a few disk motors and we are attaching those to our fixture. The set up is fine and we have been able to get the motors running and been able to vibrate...

Homework Statement Two springs, each with unstretched length 0.200 m, but with different force constants k1 and k2, are attached to opposite ends of a block with mass m on a level, frictionless surface. The outer ends of the springs are now attached to two pins P1 and P2, 0.100 m from the...

Hi all I am struggling with going between various representations of vibrations in paticular the complex form. I am using Rao as my text btw so for a free vibration and making it simple no damping the euqation of motion is mx^{..} + kx = 0 with the general solution being x...

Homework Statement Hello, I would just like to make sure I am doing the problem correctly. What I have is a cantilever uniform beam that is fixed at one end and free on the other. Basically, it is a wing and I am using a lumped mass approach to find a graphical representation of the wing's...

lets say you build a capacitor heat engine that is made of two charged parallel plates. let's say one plate is hotter then the other and do to the thermal vibration one is moving more then the other. you should be able to convert the mechanical vibration to electrical current. now the question...

Hi, I need some help with an experiment: I have a cantilevered steel beam, fixed at one end and free at the other. When I excite the beam with forced vibration at the fixed end, resonant frequencies are evident. The first is at 10 Hz and the second is at 60Hz. Performing analytic...

Homework Statement I need to find the maximum speed of a hydraulic valve component which is attached to a vibration testing machine and subjected to sinusoidal vibrations. The values I have so far are the frequency of vibration, the period of motion, the acceleration amplitude and the...

I need to calculate the frequency of sinusoidal vibrations in simple harmonic motion. The only known values that I have are the acceleration amplitude and the vibration amplitude. Is there a way of calculating the frequency of vibration without knowing the period of the oscillations?

Hi all. Iam trying to find out an mass-damper-spring equations for a 1-DOF mechanical shaker for the purpose of plant model equation.Further, this equation is used in kalman filter algorithm with measurement model of an accelerometer. Can anyone help? Thanks in advance...!

Hi guys, in my company we have seen a lot a failures on a flange, in particular one flange screw strips. This flange is mounted in a vehicle and it support some hydraulic pipes. The designer thinks vibrations should cause the failure and so he suggests me to measure the flange acceleration along...

Hi everyone, this i my first post here. I need some help in doing a general work instruction for motor vibration analysis. I am totally new in this maintenance sector. I could do with some help :) Basically i need to know which exact points i have to test for vibration and method to be use...

Hello all. I have a question about a wing model... The model I have is an airplane wing (airfoil) in a wind tunnel. The wing is supported at the quarter-chord length and the wing body is free to move. My model is in the time domain with an oscillatory force at 20 Hz applied to the wing...

So heat is vibration of atoms in lattice (or fluid). Heat is also electromagnetic radiation. Do we say "heat is electromagnetic radiation", or is that incorrect, since heat is vibration of atoms in lattice? Should we say "heat is __spread by__ electromagnetic radiation instead?

Hi guys, I want to estimate vehicle pitching, bouncing and rolling natual frequencies. I am doubdful in the vehicle excitement. How can I understand if the excitation has a good frequency content?