| الملخص: | [Objective] In the actual operation process, the noise generated by medium-low speed maglev trains is a key factor affecting the quality of train service. Therefore, it is necessary to analyze the noise in medium-low speed maglev trains. [Method] The testing scheme for noise in medium-low speed maglev trains is introduced. Taking a certain medium-low speed maglev vehicle as example, the train maglev noise, suspension frame vibration, and linear motor current under train typical operating conditions are analyzed, and corresponding noise reduction measures are proposed. [Result & Conclusion] The noise frequency at 9# motor measuring point is mainly concentrated in the low-frequency band below 50 Hz, with significant noise at 1000 Hz and its multiplications. The vertical vibration acceleration of the suspension frame is mainly concentrated between 0 to 1.5 g (g as gravitational acceleration), and the vertical acceleration during braking is significantly higher than that during acceleration. The high-frequency vibration component of the suspension frame vertical acceleration is mainly concentrated at 1 000 Hz and its multiplications. The harmonic electromagnetic excitation force caused by the 1 000 Hz harmonic current leads to electromagnetic excitation of vehicle bottom mechanical structure, resulting in high-frequency noise from the maglev train bottom. Noise reduction measures such as adjusting switching frequencies and installing filters can effectively reduce the operating noise of medium-low speed maglev trains.
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