Small small-sized bearing rolling noise analysis

Rolling bearing is the basis of the mechanical devices commonly used devices, though the noise of the bearing itself generally not influence the equipment noise level, but work bearing suitable rate of small vibration, can produce resonance, make the adjacent parts to produce larger noise. Especially for precision equipment, if the bearing itself is bad or defective, the bearing noise can also be one of the main noise source, so the bearing noise is also cannot be ignored. One, the production mechanism of the noise from the physics point of view, the noise is refers to the sound intensity and frequency is irregular, the sound of the chaotic changes, mainly through the noise to measure the strength of the noise and spectrum analysis, noise measurement method and vibration measurement method is not the same, too. Ball bearing noise is rotating on outer ring, and under the condition of fixed by the sound level meter measurement of sound pressure level to review. Objects emit noise, vibration and mechanical noise from mechanical components between alternating force. According to force transfer type and function, these alternating force generally can be divided into three types of periodic force, impact force and friction. A periodic will arouse the power of the mechanical parts of steady-state vibration, noise at the same time, and go out in the form of sound energy to the surrounding radiation. In principle, it is hard to completely eliminate the steady state vibration, to control the noise, the most fundamental way is to eliminate or reduce the vibration exciting force caused by a lot of mechanical noise mainly comes from collisions between mechanical parts, to reduce the noise will send first level or increase the damping of low vibration. Friction noise is the object of mutual friction friction caused by the noise. Produce the brush when high friction, the vibration amplitude. Therefore to overcome the friction noise is the basic method of reducing friction. According to the above the noise of the classification and incentive form, bearing noise can be divided into: bearing inherent noise, due to the design and process machining error of noise and noise caused by scar and inclusions. The main reason for the rolling bearing noise is due to the rolling bearing in the process of rotation, under the effect of load, the rolling bearing distortion caused by vibration. Second, the noise of the classification and the causes of 1. The inherent noise of rolling bearings if the control of various sizes of bearings are the ideal size ( The internal and external raceway and rolling body are round, have clearance) And there is no error, also can produce the inherent noise, when bearing rotation for rolling bearing which is itself is a kind of noise, is inevitable. This kind of noise is due to the bearing rotating a smooth, continuous noise, it is a basic noise. The noise is caused by the natural vibration of elastic ring bending. This kind of vibration in radial and axial directions. On the number of learning can be described with the volume integral: set elastic alternating force for F ( ) , the system damping for c, system quality is m, system for spring stiffness k