噪声与振动控制
譟聲與振動控製
조성여진동공제
NOISE AND VIBRATION CONTROL
2014年
5期
198-202,209
,共6页
汪小银%单颖春%刘献栋%何田%吴金涛
汪小銀%單穎春%劉獻棟%何田%吳金濤
왕소은%단영춘%류헌동%하전%오금도
振动与波%颗粒阻尼器%台架实验%正弦扫频%随机激励%非线性振动
振動與波%顆粒阻尼器%檯架實驗%正絃掃頻%隨機激勵%非線性振動
진동여파%과립조니기%태가실험%정현소빈%수궤격려%비선성진동
vibration and wave%particle damper%bench test%swept-sine vibration test%random excitation%nonlinear vibration
用多组颗粒阻尼器对航天器上某工程结构进行减振实验研究,并用两种指标(共振峰处传递函数和测点与激振台加速度均方根之比)分别评价了正弦扫频和随机激励作用下颗粒阻尼器减振效果,发现采用正弦扫频、随机激励两种激励条件时,得出的减振效果有明显差异。为此,对差异机理进行了研究、分析。结果表明:颗粒阻尼器作为一种强非线性的被动阻尼器,其减振效果的评价不宜基于某种特定的激励条件和采用单一的评价指标,而应根据具体的使用环境选择合适的激励条件和评价指标。
用多組顆粒阻尼器對航天器上某工程結構進行減振實驗研究,併用兩種指標(共振峰處傳遞函數和測點與激振檯加速度均方根之比)分彆評價瞭正絃掃頻和隨機激勵作用下顆粒阻尼器減振效果,髮現採用正絃掃頻、隨機激勵兩種激勵條件時,得齣的減振效果有明顯差異。為此,對差異機理進行瞭研究、分析。結果錶明:顆粒阻尼器作為一種彊非線性的被動阻尼器,其減振效果的評價不宜基于某種特定的激勵條件和採用單一的評價指標,而應根據具體的使用環境選擇閤適的激勵條件和評價指標。
용다조과립조니기대항천기상모공정결구진행감진실험연구,병용량충지표(공진봉처전체함수화측점여격진태가속도균방근지비)분별평개료정현소빈화수궤격려작용하과립조니기감진효과,발현채용정현소빈、수궤격려량충격려조건시,득출적감진효과유명현차이。위차,대차이궤리진행료연구、분석。결과표명:과립조니기작위일충강비선성적피동조니기,기감진효과적평개불의기우모충특정적격려조건화채용단일적평개지표,이응근거구체적사용배경선택합괄적격려조건화평개지표。
The vibration reduction effects and mechanism of particle dampers have been widely studied. However, very few literatures, which investigate the influence of various excitations on the vibration reduction effect, can be found. In this paper, the experimental study on applying several particle dampers to the engineering structure of a spacecraft is performed, and two indexes (transfer function at resonance points and ratio of RMS accelerations between the measurement point and the testing bench) are used to evaluate the vibration reduction effects under swept-sine and random excitations. And a significant difference between the evaluation results under the swept-sine and the random excitations for the same particle damper is found. Thus, the mechanism of the difference is analyzed. The results indicate that the vibration reduction effect of the particle damper, as a kind of passive dampers with strongly nonlinear characteristics, is unlikely to be evaluated by a single evaluation index under a specific excitation only, but should be evaluated by a proper excitation condition and an evaluation index according to its working environment.