There are many methods for measuring vibration, such as electrical measurement methods, mechanical methods, and optical methods. Among them, electrical measurement methods are very commonly used. According to the physical quantity of measuring vibration, it can be divided into displacement, velocity and acceleration. Among them, displacement is suitable for measurement. Low frequency Vibration; velocity is suitable for measuring mid-frequency vibration; acceleration is suitable for measuring high-frequency vibration. Displacement, velocity, and acceleration between the three parameters can be obtained through mathematical differentiation or integration, but acceleration is obtained through integration and the velocity and displacement errors are small, and the displacement Or the difference in speed is greater error.
The method of measuring ball screw noise is more difficult than measuring vibration and many other physical quantities, and it is not easy to measure, that is, the measurement error is large. The ideal sound field for measuring noise is the free sound field. The free sound field means that it is uniform and isotropic In the medium, the boundary effect can be ignored. Sound field. In the free sound field, sound waves can propagate the radiation characteristics of the sound source in all directions without obstacles or interference. However, it is difficult to achieve a free sound field, and usually only certain measurements can be obtained. The approximate free sound field required by the error. The sound field in an anechoic chamber. The anechoic chamber can effectively absorb incident sound waves. The effect of reflected sound waves on the sound field is basically negligible. Therefore, the sound field in an anechoic chamber can basically be regarded as Free sound field in a specific frequency range. The method of measuring ball screw noise is to use the A-weighted network sound pressure level in the anechoic room (A-weighted sound level is suitable for simulating the frequency characteristics of the human ear, and low-intensity noise below 55dB. As well as the attenuation of low-frequency components. Very large), the background noise requirement should generally be less than 15dB(A) or even 12dB(A). When measuring, the difference between the ball screw noise and the background noise should be greater than 10dB(A), the very small value must be above 4dB(A), otherwise it is difficult to accurately measure the noise ball screw.
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