The poppet valve is a fundamental component in fluid power systems. Under particular conditions, annoying ＂squeal＂ noises may be generated in hydraulic poppet valves. In the present study, the frequency spectrum of ...The poppet valve is a fundamental component in fluid power systems. Under particular conditions, annoying ＂squeal＂ noises may be generated in hydraulic poppet valves. In the present study, the frequency spectrum of the squeal noise is obtained by analyzing the sampling data from the accelerometer mounted on the valve body. It is found that the flow velocity, pressure, and structural parameters have crucial effects on the properties of squeal noise, especially frequency. Larger valve chamber volume or lower backpressure leads to lower fundamental frequency of the squeal noise. An explanation for the squeal noise, as a result of Helmholtz resonance, is suggested and proved by experimental results.展开更多
流致声共振是发生在特定结构中的流场与声场相互作用的现象。针对方形封闭旁支管结构的声共振特征开展实验，研究了主管道流速和旁支管长度对封闭旁支管声共振现象的影响，获得了声共振发生区域和压力脉动特征。实验研究的3种旁支管长...流致声共振是发生在特定结构中的流场与声场相互作用的现象。针对方形封闭旁支管结构的声共振特征开展实验，研究了主管道流速和旁支管长度对封闭旁支管声共振现象的影响，获得了声共振发生区域和压力脉动特征。实验研究的3种旁支管长度分别为 L/d＝5、6和7，实验的雷诺数 R e＝2.74×10^4～2.429×10^5，马赫数 M a＝0.025～0.218。研究结果表明，声共振频率随流速的增加表现出频率锁定特征，随旁支管长度的增大，共振工况声压幅值降低，声共振频率降低。在本实验结构中，声共振现象发生在斯特鲁哈数为0.3～0.6和0.7～1.0的区域内。展开更多
基金Project supported by the National Natural Science Foundation of China （No. 51475415）, the Science Fund for Creative Research Groups of the National Natural Science Foundation of China （No. 51221004）, and the Fundamental Research Funds for the Central Universities, China
文摘The poppet valve is a fundamental component in fluid power systems. Under particular conditions, annoying ＂squeal＂ noises may be generated in hydraulic poppet valves. In the present study, the frequency spectrum of the squeal noise is obtained by analyzing the sampling data from the accelerometer mounted on the valve body. It is found that the flow velocity, pressure, and structural parameters have crucial effects on the properties of squeal noise, especially frequency. Larger valve chamber volume or lower backpressure leads to lower fundamental frequency of the squeal noise. An explanation for the squeal noise, as a result of Helmholtz resonance, is suggested and proved by experimental results.
文摘流致声共振是发生在特定结构中的流场与声场相互作用的现象。针对方形封闭旁支管结构的声共振特征开展实验，研究了主管道流速和旁支管长度对封闭旁支管声共振现象的影响，获得了声共振发生区域和压力脉动特征。实验研究的3种旁支管长度分别为 L/d＝5、6和7，实验的雷诺数 R e＝2.74×10^4～2.429×10^5，马赫数 M a＝0.025～0.218。研究结果表明，声共振频率随流速的增加表现出频率锁定特征，随旁支管长度的增大，共振工况声压幅值降低，声共振频率降低。在本实验结构中，声共振现象发生在斯特鲁哈数为0.3～0.6和0.7～1.0的区域内。
