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well we all know that noise is "unwanted/unpleasent" vibrations.But, this is almost a laymans answer. I would like to know what vibrations constitute the "basic notes"? and what makes it pleasent to ears? Further how is that the music revolves around the 7 basic notes? as a...

Can any one explain how Nyquist plot is assosciated with predicting Stability of a system

If i know the overall acceleration to be 0.3 g, displayed on an analyzer for a frequency range of 10 Hz to 10 kHz. For a shaft rotating at a speed of 2700 rpm, how do i calculate the overall velocity(rms)mm/s. thanks in advance. .....kashyap

An accelerometer is fit on the bearing housing at an angle of 45 deg to the horizontal plane, and measures an acceleration of 0.3g(rms). How can i calculate the values in horiz. and vertical planes? Further, is there any advantage in mounting the accelerometer in an inclined plane (45deg)?

Why noise anaysis is preferred in Gear-box as compared to vibration anaysis? if the above question isn't correct, then i would like to know when noise analysis is preferred to vibration analysis?

I just want to know, if acceleration displayed on vibration analyzer can be directly divided by angular velocity of the shaft in order to obtain the value of veloity(mm/sec)and similarly for displacement(velocity/angular velocity of the shaft).

What is a waterfall diagram, and how does it help in vibration analysis?

From Where can i get info about the mechanical advantages that we get from different configurations of pulley?

How the nature of deflection of rollers in rolling mills is figured, knowing the octave band(i.e, 3rd, 5th etc.) and vice-versa.

In case of an earthquake the windowpanes shatter first. I do know that this is related to resonance, but that would mean, the frequency of excited vibration(due to earth-quake) matches with the natural frequency of glass window. But again i find this explanation incomplete, can anyone elaborate...

pl. provide me a list of websites where i can get good basics about Modal Analysis, if possible with case-studes?

Which websites can get me basics about Modal analysis, if possible with case studies?

Is it due to space constraints to place accelerometer in the 3 dirns, or any other reason associated, for using a tri-axial accelerometer in field?

pl. suggest me the best available vibration analyzer for condition monitoring activity with foll. features: * Multi-channel & portable. * In-built s/w packages for in-situ analysis & generation of reports. pl. give me the contact address in India if possible B'lore