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目的:液压锥阀产生尖锐刺耳的啸叫噪声,严重地降低了液压锥阀的品质。本文探讨液压锥阀啸叫噪声的产生机理,揭示啸叫噪声对特定频率噪声信号的选择性放大原理,为啸叫噪声抑制提供理论依据。创新点:观测到介质相变、锥阀开度及阀腔变化下啸叫噪声基频漂移现象,建立空化条件下锥阀流体共振分析模型,获得了锥阀啸叫噪声是对特定频率信号的选择性放大的结论。方法:1.通过实验分析,观测到液压锥阀中啸叫噪声基频的漂移规律(图5~7、10和11);2.提出液压锥阀啸叫噪声是流声耦合引起的亥姆霍兹共振假设;3.通过建立锥阀阀腔声学共振频率模型,运用实验与理论相结合的方法分析不同工况下的啸叫噪声基频漂移规律,通过大量实验验证所提假设的正确性(图7、10和11)。结论:1.液压锥阀流声共振产生啸叫噪声,完成对特定频率噪声信号的选择性放大;2.液压锥阀只有在流体不稳定产生的周期性压力扰动信号的频率与阀腔声学共振频率接近时才产生啸叫噪声;3.运用液压锥阀流声共振产生啸叫噪声的结论,通过改变阀腔声学共振频率,使之与流道内流体不稳定引起的压力扰动频率错开,能有效地抑制液压锥阀中啸叫噪声的产生。
Purpose: Hydraulic poppet valves produce sharp, harsh whistling noise that severely reduces the quality of hydraulic poppet valves. This paper explores the mechanism of howling noise of hydraulic poppet valve and reveals how the howling noise selectively amplifies the noise signal of specific frequency to provide a theoretical basis for howling noise suppression. Innovative point: observed media phase change, the cone valve opening and the change of the valve cavity under the whistle noise fundamental frequency drift, the establishment of cavitation valve cone valve fluid resonance analysis model was obtained cone valve whistle noise is a specific frequency signal The selective enlargement of the conclusion. The experimental results show that the drift of the fundamental frequency of the howling noise in the hydraulic poppet valve is observed (Fig. 5 ~ 7, 10 and 11); 2. It is proposed that the whistling noise of the hydraulic cone valve is caused by the acoustic coupling Hawthorne resonance hypothesis; 3. Through the establishment of cone valve cavity acoustic resonance frequency model, the combination of experimental and theoretical analysis of different conditions of howling noise fundamental frequency drift law, through a large number of experiments to verify the accuracy of the hypothesis (Figures 7, 10 and 11). The hydraulic cone valve generates noisy noise and completes the selective amplification of the noise signal at a specific frequency. 2. The hydraulic cone valve only resonates with the valve cavity only when the frequency of the periodic pressure disturbance signal generated by fluid instability The whistling noise is generated when the frequency is close to 3.Through the hydraulic cone valve to produce whistling noise, conclusion can be validated by changing the resonant frequency of the valve cavity to the frequency of pressure disturbance caused by unstable fluid in the flow channel To suppress the hydraulic cone valve whistling noise generation.