Reduction in machine noise and vibration levels based on the statistical energy analysis method

Abstract

In noise and vibration control, damping treatment and isolation of structures are often applied to dissipate the energy of flexural vibrations and to reduce the transmission of energy to the surroundings. However, these treatments must be carefully designed because the present requirements of the size, power and noise levels resulting from commercial competition are very restrictive and usually there is little space to put additional material. In this paper, the statistical energy analysis (SEA) method has been used to optimize such treatment. The power balance equations have been established for a motor-fan-casing unit, and the design and possible modifications have been analysed with an SEA model. The energy transmission paths within the structure have been clearly identified and the test results confirmed the accuracy of this model. The optimum has been determined and lower noise levels have been verified by tests. A significant reduction in noise level has been achieved and the example has shown that an SEA model is very useful for analysing structures with regard to noise and vibration levels.

Research on vibration suppression method of alternating current motor based on fractional order control strategy

“…AC motor is regarded as one typical rotating machinery, its vibration mainly includes the electromagnetic vibration and mechanical vibration. [4][5][6] The vibration of motor will cause the bending and breaking of rotor, accelerating the bearing wear, leading to shorten the life of motor. Therefore, the vibration suppression of motor has been one widely concerned science problem.…”