Keywords:
Fluid power
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Through comparative experiments of testing vibration and noise on the high speed gearbox vibration and noise control test bench,the noise of meshing impact frequency and frequency doubling and the noise of natural frequency are tested.By analyzing the effect of damping for vibration and noise it is found that pasting damping material could control the vibration and noise.Two configurations of pasting damping material and filling damping material had good effect on vibration and noise control.It is certified that damping characteristic is enhanced through appending damping on gearbox and it is consist with the theory of damping for vibration and noise control.According to the main vibration of the gear meshing impact in gearbox,the configuration of alloy damping-ring could control the vibration and noise through testing and analyzing.It is the bases of researching vibration and noise control of over loading drag device with gear inducer.
Damping torque
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The solution to the low frequency noise control by active noise reduction is discussed, and the effects of vibration control of structure acoustic through the analysis of the principle of active noise reduction and the active vibration control measures of structure acoustic are described in this paper. The structural plate is taking as an example to study the degree of noise radiation reduction in the case of adding a secondary vibration source based on simulation, which can explore new solutions for noise control.
Active Noise Control
Active Vibration Control
Acoustic radiation
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Using noise and vibration analysis system,the transmission system noise and vibration of a traction motor were tested,and the characteristics of the noise and vibration were analyzed.It is concluded that the noise level increases with the rotation speed increasing mainly in the frequency range near 800 Hz,and noise of MIC02 is higher than the noise of MIC01;gearbox vibration is bigger than motor vibration.This work provides a reference for noise and vibration reduction design of transmission systems of traction motors.
Traction motor
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In this paper, active vibration control concept using the existing pump control system based on the multi-frequency two-weight notch LMS (Least Mean Square) filter was investigated and tested experimentally. This research also includes the direct swash plate acceleration measurement, the case acceleration measurement, and the simultaneous multi-position microphone measurement in the semi-anechoic chamber. A 75 cc/rev swash plate type axial pump was modified to implement swash plate active vibration control combining a high speed direct drive servovalve, an electronic swash plate angle sensor, a swash plate acceleration sensor, and a high speed real-time controller with the NI Labview FPGA. Vibration measurements utilizing a tri-axial swash plate acceleration sensor and two tri-axial case acceleration sensors, and noise measurements using three microphones were conducted in the semi-anechoic chamber to investigate the influence and effectiveness of the developed system and the proposed swash plate active vibration control.
Swash
Anechoic chamber
Piston (optics)
Active Vibration Control
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Through analysis and research on the noise and vibration in the test ground of vibratory road roller, measures have been taken to lower the noise and vibration level and good effect has been resulted.
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