引信气流激振压电发电机结构参数影响分析

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1、引信气流激振压电发电机结构参数影响分析邹华杰张江华BBS王泽平常州机电职业技术学院机械工程学院南京理工大学机械工程学院满足引信用小型振动压电发电机气流致振发电要求，解决稳定激振力的问题，控制结构敏感参数是一种有效方法。通过模拟吹风实验，分析气流致声激振机构的相关结构参数对激振力的影响规律。结果表明，不冋共振腔长度对应的激振力幅值与入流速度近似呈现线性增大趋势，丑长度越大其斜率越小，反之亦然，喷口到共振腔的间距和喷口环隙对激振力幅值的影响较复杂，过大或过小都会使得激振力幅值较小甚至没有波形产生;共振腔长度是影响激振力频率的主耍因数，频率随长度的增大而变小，呈现

2、反比关系，喷口到井振腔的间距和喷口环隙对频率的影响较小。因此，对于高速气流，短共振腔可以获得较大幅值的高频稳定激振力，以及需合理控制喷门到共振腔的间距和喷门环隙使得激振力幅值较大。关键词：:ft-号器禾斗引信;’气流至夂声;压电发电权L;激振力;E一mail:zhj88000@163.收稿曰期:2017-03-02基金：W家自然科学基金项目(51377084)AnalysisofStructureParametersofAirflow-inducedVibrationPiezoelectricGeneratorforFuzeZOUHua-jieZHANGJT

3、iang—huaCHENHe-juanWANGZe-pingCollegeofMechanicalEngineering，ChangzhouVocationalInstituteofMechatronicTechnology;SchoolofMechanicalEngineering,NanjingUniversityofScienceandTechnology;Abstract：Inordertomeettherequirementsofairflow-inducedvibrationofsmallpiezoelectricgeneratorforfuze

4、,andsolvethecriticalissueofstableexcitationforce,thekeyistoeffectivelycontrolthesensitiveparametersofgeneratorstructure.Theinfluenceofrelatedstructuralparametersofairflow-inducedexcitationdeviceonexcitationforceisanalyzedthroughsimulatingflowtest.Thetestresultshowsthattheamplitudes

5、ofexcitationforcecorrespondingtodifferentresonatorlengthsincreaseapproximatelylinearlywiththeairflowvelocity,andthelongerthelengthofresonatoris,thesmallertheslopeis,andviceversa.Thespacebetweennozzleandresonatorandtheringgapshavethecomplexeffectsontheamplitudeofexcitationforce,andt

6、oobigortoosmallgapwouldmaketheamplitudesmallerorevennowaveformformed.Thelengthofresonatoristhemainfactorimpactingonthefrequencyofexcitationforce,andthefrequencydecreaseswiththeincreaseintheresonatorlength,presentinganinverserelationship.Thespacebetweennozzleandresonatorandtheringga

7、pshavelesseffectsonthefrequencyofexcitationforce.Therefore,forhighairflowvelocity，thestableexcitationforcewithhighamplitudeandfrequencycanbeobtainedbyshortresonator.Inaddition,reasonablespaceandringgapsarealsoimportantforensuringbiggeramplitudeofexcitationforce.Theresultingsensitiv

8、eparametervaluesofsoundexc