基于时频分析的非稳态排气噪声辐射特性研究  

Study on radiation characteristics of unsteady exhaust noise based on time-frequency analysis

作　　者：李靖祥[1] 赵升吨[1] 钟斌[1] 赵仁峰[1] 

机构地区：[1]西安交通大学机械工程学院模具与先进成形技术研究所,陕西西安710049

出　　处：《锻压装备与制造技术》2015年第1期91-94,共4页China Metalforming Equipment & Manufacturing Technology

基　　金：高档数控机床与基础制造装备国家科技重大专项资助项目(2011ZX04016-081);国家自然科学基金资助项目(51175413);中央高校基本科研业务费专项资金资助项目

摘　　要：应用时频分析方法对气动装置的非稳态排气噪声进行研究,分析了该排气噪声频谱随时间变化的规律,揭示出该排气噪声具有的脉冲冲击特性的产生机理,非稳态质量流引起的单极子声源和湍流四极子声源在排气过程中的变化规律及辐射特性。The time-frequency analysis method has been applied to study on the radiated noise of unsteady pneumatic exhaust. The variation law of noise spectrum with time has been analyzed. The generation mechanism of impulsive and shocked exhaust noise has been revealed. The variation law of mono-pole source generated by unsteady mass flow and quadrupole source generated by turbulence during the exhaust process has been put forward, as well as the radiation characteristic.

关 键 词：气动装置 排气噪声 时频分析 辐射特性 

分 类 号：V211.24[航空宇航科学与技术—航空宇航推进理论与工程]