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减振结构刚度特性对随机振动响应的影响 被引量:4
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作者 陈颖 朱长春 +1 位作者 王雄祥 周德惠 《西南交通大学学报》 EI CSCD 北大核心 2002年第B11期26-29,共4页
对典型的减振结构建立等效的质量 刚度集中参数模型 ,推导在基础随机激励下该模型的振动响应谱解析公式 ,并对它们在不同刚度参数下的振动响应变化特点进行了分析。通过分析可知 :在质量和阻尼一定的情况下 ,减振结构的刚度越小 ,对高... 对典型的减振结构建立等效的质量 刚度集中参数模型 ,推导在基础随机激励下该模型的振动响应谱解析公式 ,并对它们在不同刚度参数下的振动响应变化特点进行了分析。通过分析可知 :在质量和阻尼一定的情况下 ,减振结构的刚度越小 ,对高频的过滤作用越明显 ;无论系统或减振结构刚度如何变化 ,其位移响应谱总均方根值主要都集中在低频段 ,因此对于需严格控制线位移或角位移的系统 。 展开更多
关键词 减振结构 刚度特性 随机振动 振动响应谱 质量-刚度集中参数模型 减振设计
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基于随机结构的延寿服役海洋平台管节点疲劳寿命可靠度预测方法 被引量:2
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作者 刘勇 陈炉云 易宏 《上海交通大学学报》 EI CAS CSCD 北大核心 2013年第6期950-955,共6页
将延寿服役平台管节点在进行疲劳寿命可靠度预测的过程中视为随机结构,基于断裂力学疲劳模型,结合随机有限元法和复合随机振动理论,提出海洋平台管节点随机结构在随机波浪作用下疲劳寿命预测方法.通过算例说明了该方法的实用性和简便性... 将延寿服役平台管节点在进行疲劳寿命可靠度预测的过程中视为随机结构,基于断裂力学疲劳模型,结合随机有限元法和复合随机振动理论,提出海洋平台管节点随机结构在随机波浪作用下疲劳寿命预测方法.通过算例说明了该方法的实用性和简便性,同时计算结果证明结构随机性会对疲劳寿命可靠度预测产生较大的影响. 展开更多
关键词 延寿服役平台 管节点 疲劳寿命可靠度 随机结构 复合随机振动响应谱 虚拟激励法
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ANALYSIS FOR AIRCRAFT TAXIING AT VARIABLE VELOCITY ON UNEVENNESS RUNWAY BY THE POWER SPECTRAL DENSITY METHOD 被引量:2
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作者 聂宏 W.Kortuüm 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2000年第1期64-70,共7页
In this paper a novel approach for the analysis of non stationary response of aircraft landing gear taxiing over an unevenness runway at variable velocity is explored, which is based on the power spectral density met... In this paper a novel approach for the analysis of non stationary response of aircraft landing gear taxiing over an unevenness runway at variable velocity is explored, which is based on the power spectral density method. A concerned analytical landing gear model for simulating actual aircraft taxiing is formulated. The equivalent linearization results obtained by probabilistic method are inducted to treat landing gear non linear parameters such as shock absorber air spring force, hydraulic damping and Coulomb friction, tire stiffness and damping. The power spectral density for non stationary analysis is obtained via variable substitution and then Fourier transform. A representative response quantity, the overload of the aircraft gravity center, is analyzed. The frequency response function of the gravity overload is derived. The case study demonstrates that under the same reached velocity the root mean square of the gravity acceleration response from constant acceleration taxiing is smaller than that from constant velocity taxiing and the root mean square of the gravity acceleration response from lower acceleration taxiing is greater than that from higher acceleration. 展开更多
关键词 aircraft landing gear random vibration non stationary response power spectral density equivalent linearization
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New Observation of Na2 4^3∑g^+ State by Pulsed Perturbation Facilitated Optical-Optical Double Resonance Spectroscopy
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作者 Zheng Chen Cheng-zhe Cui +3 位作者 Yao-ming Liu Li Li V. B. Sovkov V. S. Ivanov 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 北大核心 2006年第1期11-14,共4页
Sixty-five new vibronic levels of the Na2 4^3∑g^+ state have been observed in the 33900-35200 cm^-1 energy region above the potential minimum of the ground state by pulsed perturbation facilitated optical-optical do... Sixty-five new vibronic levels of the Na2 4^3∑g^+ state have been observed in the 33900-35200 cm^-1 energy region above the potential minimum of the ground state by pulsed perturbation facilitated optical-optical double resonance (PFOODR) fluorescence excitation spectroscopy. These new data fill the gap between the low-v levels mainly observed by continuous wave (CW) PFOODR spectroscopy and the high-v levels above the 3s+3d limit observed by pulsed PFOODR with predissociation detection, Molecular constants are fitted below potential shelf around the 3s+3d atomic limit with previously published data (mainly observed by CW PFOODR) and these new data. RKR potential curve has been calculated with the new constants. The constants are: Te= 32127.090 cm^-1,ωe=121.4099(0.20720) cm^-1, Be = 0.116287(0.0002300) cm^-1, Re=3.551 A, An error of the RKR potential curve of J. Chem. Phys. 108, 7707 (1998) is corrected. 展开更多
关键词 NA2 Triplet states PFOODR 4^3∑g^+ state STATE Rydberg states
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Piezoelectric active control for tail buffeting at high angle of attack 被引量:1
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作者 WANG Wei ZHANG XinPing +2 位作者 YANG ZhiChun LI Bin LIU JinLi 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第10期2694-2699,共6页
Tail buffeting at high angle of attack causes distinct fatigue problem on tail structure of twin tail fighters.In this study,a piezoelectric active control experiment of tail buffeting was performed in a wind tunnel u... Tail buffeting at high angle of attack causes distinct fatigue problem on tail structure of twin tail fighters.In this study,a piezoelectric active control experiment of tail buffeting was performed in a wind tunnel using arching PZT actuator(APA) and principal modal control(PMC) method.Test results showed the peak value of power spectral density(PSD) function of tail buffeting acceleration response could be suppressed by about 42% when the angle of attack reached 35°,indicating the validity and feasibility of PMC method and APA for tail buffeting alleviation at high angle of attack. 展开更多
关键词 tail buffeting piezoelectric active control aeroelastic model wind tunnel test
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