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Numerical Simulation and Experimental Study on Inherent Characteristics of Gearboxes Tao Zeguang, Li Runfang, Lin Tengyi (Constrained modal calculations for the gearbox finite element model of Chongqing University's mechanical transmission. Table 1 shows the calculated first 10 natural frequencies and modes.
Only the front 4th natural mode of the gearbox is shown. Table 1 The natural frequency and mode shape of the first 10 gears of the gearbox. The modal order natural frequency (Hz) 734.7 Vibration mode axial oscillation longitudinal expansion axial expansion torsion longitudinal torsion bending Deformation Bending Deformation Bending Deformation Bending 4 Gearbox Natural Frequency Test At present, the natural frequency of the box-type parts is mainly obtained by the experimental modal analysis method. Since the experimental modal analysis method tests the actual structure, the natural frequency reliability obtained is high, especially in the low frequency band. Due to the inevitable high-frequency interference during the test, the accuracy of the obtained modal parameters is low. In order to verify the correctness of the finite element method of the natural frequency of the box, the experimental modal analysis method is used to obtain the inherentity of the box. frequency.
4.1 Basic composition and test method of the test system At the same time, the force signal is collected by the force sensor BK8202 on the pulse hammer, and the response signal is collected by the acceleration sensor BK4373 on the surface of the box; then the signal (force, acceleration) transmitted by the sensor is passed. The charge amplifier BK2635 is amplified and input to the tape recorder TEAC-MR30 to record the signals of the two channels. At this time, the signal analyzer CF-355 can be used to observe the signal condition; then, the signal on the tape is played back to the spectrum analyzer CF-355. After the signal pre-processing, a fast Fourier transform (FFT) is performed to obtain its transfer function. Through the multiple measurements on the axial, longitudinal and vertical main points of the gearbox, the curve fitting and parameter identification of each transfer function can obtain the vibration modal parameters (such as modal frequency, vibration mode, damping ratio). Etc), this test only obtains the natural frequency of the box 4.2. Comparing Table 1 and Table 2, the calculation results are shown. The intrinsic characteristic parameters of the box are measured by the test modal analysis method. The main process is as follows: Firstly, the pulse hammer force is applied to the surface structure of the tooth 1 wheel by the pulse hammer 妒20 and this ublishing
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