PROBLEM TO BE SOLVED: To provide a system for evaluating noise reduction device performance, with enhanced evaluation accuracy by eliminating variation in an evaluation result which depends on positions of microphones.SOLUTION: The system for evaluating noise reduction device performance includes; oscillation means 3 for oscillating air in an annular cavity SP of a structure 1 having the annular cavity SP; a noise reduction device 2, arranged in the annular cavity SP, for reducing sound waves in the annular cavity SP; a plurality of microphones 4 arranged in the annular cavity SP; and an evaluation device 5 for calculating a performance value of the noise reduction device 2 based on sound waves measured by the plurality of microphones 4. When the annular cavity SP is divided into halves of a first region Ar1 and second region Ar2 at an oscillating position 3a of the oscillation means 3, the plurality of microphones 4 are arranged only in the first region Ar1 and the noise reduction device 2 is arranged only in the second region Ar2.

    【課題】マイクロフォンの位置に応じた評価結果にバラツキを無くして、評価精度を向上させた騒音低減装置の性能評価システムを提供する。【解決手段】環状空洞SPを有する構造物1の空洞内空気を加振する加振手段3と、環状空洞SPに配置され、環状空洞SPの音波を低減する騒音低減装置2と、環状空洞SPに配置される複数のマイクロフォン4と、複数のマイクロフォン4で計測した音波に基づき騒音低減装置2の性能値を算出する評価装置5と、を有する。加振手段3による加振位置3aを境界として環状空洞SPを第1領域Ar1と第2領域Ar2の半分に分割した場合に、複数のマイクロフォン4は第1領域Ar1のみに配置され、騒音低減装置2は第2領域Ar2のみに配置されている。【選択図】図2


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    Title :

    SYSTEM AND METHOD FOR EVALUATING NOISE REDUCTION DEVICE PERFORMANCE


    Additional title:

    騒音低減装置の性能評価システム及び騒音低減装置の性能評価方法


    Contributors:

    Publication date :

    2015-08-24


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    G01M TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES , Prüfen der statischen oder dynamischen Massenverteilung rotierender Teile von Maschinen oder Konstruktionen / B60B VEHICLE WHEELS , Räder für Fahrzeuge / B60C VEHICLE TYRES , Fahrzeugreifen / G01H MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES , Messen von mechanischen Schwingungen oder Ultraschall-, Schall- oder Infraschallwellen



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