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Modal totlpoker testing is a form of vibration testing of an object where fundamental frequencies of the object totlpoker under test is determined.There are several weys to do modal testing. The most widely used are Impact Hammer modal testing and Shaker Modal testing.Impact Hammer Modal TestingWhen an object is subjected to the strike, it is excited. totlpoker It will vibrate according to the banwidth of the impulse. While it

vibrates, the object will behave in such totlpoker a way that some of the frequencies will not be responded at all and some frequencies will be amplified. Some of the frequencies will be totlpoker amplifie in such a way that the only limiting factor is the energy available for the vibration. This is called resonance.These frequencies where the object resonates are known as the fundamental frequencies of that particular object or the modal frequencies.Shaker Modal TestingAnother method totlpoker is by using an instrument called shaker. Shakers are the devices that excites the structure according to the amplified input signal. totlpoker Several

input signals are available for modal testing, but the sine sweep and random vibration profiles are by far the most commonly used signals.Shaker totlpoker armature is attached to the body to be tested by way of piano wire or stinger . When the signal is transmitted through the piano wire or the stinger, the object responds the same way as impact testing, by attenuating totlpoker some and amplifying certain frequencies. These frequencies are measured as modal frequencies.When the impact hammer or the shaker stinger is fited with the device called a load cell, one can measure the excitation signal. The response signal is acquired through an accelerometer fitted to the object. Comparing these two signals totlpoker in the frequency domain gives one the totlpoker idea how the object moves or vibrates at modal frequencies.If adequate totlpoker measurement points are avaiiable, mode shape of the object can be evaluated from the transfer function.External links www.eigenbiz.com Eigenbiz