Natural Frequency Measurement - Kelm Engineering- impact hammer test natural frequency ,NATURAL FREQUENCY MEASUREMENT. Natural frequencies occur on all mechanical systems. In most cases they are not a problem. However, if there is an exciting force that has a frequency near the natural frequency, the vibration response will be amplified as much as 100 times what it would be without the natural frequency.What is a frequency response function (FRF)?19/10/2009· To find the natural frequency of a structure you would complete a hammer impact test with a force instrumented impact hammer and an accelerometer, sometimes called bump testing or tap testing. Taking the FFT of the response signal, converting the result to modulus and phase and taking the real part only will not give you a complete picture of the part under test.
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