1 on the real relationship between the two

When discussing the essence of the two times, the first physical characteristics analyzer. The so-called vibration is said in certain areas, many carry out the reciprocating motion, or is the highest point and the lowest point between multiple activities. The reason there is a sound is due to the motion of a body from time to time although games causes sound, but it's not all exercise will lead to sound. When the vibration, when necessary to increase the frequency of specific, can hear the sound. The current generation of high and low frequency difference if the amplitude is very high, will the antipathy, or are the ones that will disturb people's life is called noise existed. Through the above exposition. The result shows that the vibration appears when must has certain elements appear when it is sound. When sound reaches the specific background, in the presence of noise. The presence of interference to the use, so to deal with this problem, must from the source to carry out activities to control its provenance. Characteristics of its operation, due to the existence of the phenomenon of vibration, so will interfere with equipment, durability in this way will make the parts wear, and interfere with the use of reflected. For problems that are caused by vibration if I continue to stay in this kind of atmosphere, obviously my body is will be very beneficial effect therefore, through the above discussion that the noise carry out comprehensive control, from the source control, and to prevent the present problems.

2 on its characteristics

In terms of the bearing and the two phenomena, not only a common device characteristics and its some unique. Is that in lubrication or run time will lead to these problems, in addition, its can easily lead to such problems.

2.1 on its vibration characteristics

2.1.1 bearing vibration is very complex, the vibration form of radial vibration, axial vibration and coupled vibration.

2.1.2 due to bearing structure, its own has failed to prevent the natural vibration: rolling body through the bearing vibration area; II ring by load bending deformation and vibration.

2.1.3 existing manufacturing level, bearing vibration mainly with the ring raceway and rolling element waviness, and roundness and surface rough degree of non significantly related.

2.1.4 bearing vibration including vibration from low frequency to high frequency of the various frequency components, the vibration frequency is everywhere dense

Noise characteristics of 2.2 bearing

2.2.1 bearing noise is caused by the occurrence of many factors of bearing vibration, which affect larger mainly raceway and rolling body appearance degree of waviness and roughness.

2.2.2 bearing noise of sound source also includes body roll and keep the plane crash, adhere to the frame as the eddy generated whistlers, rolling body and rolling the contact friction sound (lubrication is not good) and so on.

2.2.3 bearing sound frequency background noise with white noise characteristics, but abnormal noise is the main frequency components are concentrated in 1000-10000Hz namely the bearing noise is generally expressed as a middle and high frequency noise.

The 3 control means to control the vibration and noise

The last time, has been active in analyzing the vibration problem, in essence, is actually to the noise control. Mainly because, when the bearing operation, it is easy to cause vibration problems. But because its accuracy and structural uniqueness. Generally speaking, the cause of the vibration are not very serious so due to the bearing itself caused by vibration don't actually have a negative effect. Since the durability, to carry out exploration activities are to noise control when the development of manufacturing activities or the use of specific, because the device in the operation of the games, caused the noise, interference to the normal operation and interference to production activities carried out, because the need to carry out detailed exploration, in order to prevent the noise phenomenon. At present, many international areas have carried out exploration. For the vibration of the activities, the key is to explore how to control noise, so for the vibration analysis is actually the noise control, only the the control before they can get the meaning of the actual. The living condition is getting better, for a variety of life elements are very stringent regulations. The current life atmosphere, according to the environmental regulations are very strict, so the noise is very stringent regulations. Life activities, running appliances regularly, then the provisions at the time of the operation, to control the noise to a minimum. If you want to control activities of the development, it is necessary to control the vibration of the bearings, by using a special device to carry out testing activities, a move that not only can obtain significant meaning, also can get very accurate information. If it is through the noise test, obviously the provisions for the environment is very strict provisions of background noise to some low, at this time should be the locale test, and the spent a lot of money. Therefore, in order to pass the test of vibration to realize the significance.

4 methods of measuring the vibration and noise of bearing

4.1 methods of measuring the vibration of a bearing

There are many methods to measure the vibration, electric method, mechanical method and optical method, electrometric method is one of the most commonly used. According to the physical measurement of vibration is different, can be divided into the displacement, velocity and acceleration. The displacement is applicable to the measurement of low frequency vibration; velocity applicable to measure frequency vibration; acceleration is applied to measure the high frequency vibration. Three parameters of displacement, velocity and acceleration, through mathematical differential or integral are obtained, but the acceleration by integral get smaller error of velocity and displacement and displacement or velocity differential, the error is large.

4.2 methods of measuring the bearing noise

Measurement of noise ratio measurement of vibration and many other physical quantities are difficult, not easy to measure accurately, namely measurement error. The ideal acoustic measurement of noise is the sound. Refers to the free field in the isotropic medium, the border effect can be neglected field. Free field, acoustic radiation characteristics can be source in all directions without hindrance or interference to communication. But the free field is very difficult to achieve, and generally only get to meet the requirements of some measurement error approximation of the free field, such as the sound field in an anechoic chamber. Anechoic chamber can effectively absorb the incident wave and reflection of sound waves on the sound field effect can be neglected, so in a certain frequency range, the basic sound field in an anechoic chamber that is free field. The measurement of the bearing noise method is an anechoic chamber, using a meter in network sound pressure level (A-weighted sound level applicable to simulate the human ear to below 55dB of low intensity noise frequency characteristics, and on the low frequency components decay level background noise requirements should generally be less than 15dBA even 12dBA measurement, the difference of bearing noise and background noise should preferably be in more than 10dBA, minimum essential assurance in more than 4dBA, otherwise is difficult to accurately measure the bearing noise.

epilogue

Vibration and noise from essentially said that the two aspects of one thing, with highly correlated; but from the representation point of view, because it is two kinds of physical phenomena, and each has its correlated significantly with the opposite sex. The vibration and noise of the bearing is no exception, but also has its particularity. For the control of bearing vibration, its main purpose is to control the noise.