多体系统传递矩阵法及其应用(芮筱亭[等]著)思维导图
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索力振动测量的传递矩阵法刘志军;芮筱亭;杨富锋;于海龙;姜世平【摘要】振动法测量拉索张力需要准确描述索力与自振频率的关系,在建立拉索振动的离散模型基础上应用传递矩阵法计算拉索固有频率,通过求解特征方程建立了索力与振动频率的关系;然后将计算得到的模态频率与测试得到的模态频率比较,通过修正拉索张力计算值使计算频率与实测频率误差最小,最后修正的拉索张力则为拉索实际张力.通过对实际工程的测试结果分析表明,该方法具有准确、实用和易编程的特点,完全能满足工程应用要求.%The relation between cable tension and natural vibration frequencies needs to be defined accurately for measurement of cable tension with vibration method. Transfer matrix method of a multibody system was used to compute natural vibration frequencies of a cable based on a cable-vibration discrete model. The relation between cable tension and natural vibration frequencies was described by solving a characteristic equation. The computed value of cable tension was modified until the difference between the theoretical calculation frequencies and the measured ones reached the minimum. The final computed value of cable tension was regarded as the actual cable tension. The field measurement results were analyzed and it was indicated that the proposed method has higher computational efficiency because of lower order of system matrices and can effectively satisfy the requirements for measurement precision of cable tension.【期刊名称】《振动与冲击》【年(卷),期】2011(030)010【总页数】4页(P270-273)【关键词】传递矩阵法;索力;固有频率【作者】刘志军;芮筱亭;杨富锋;于海龙;姜世平【作者单位】南京理工大学发射动力学研究所,南京210094;南京理工大学发射动力学研究所,南京210094;南京理工大学发射动力学研究所,南京210094;南京理工大学发射动力学研究所,南京210094;南京理工大学发射动力学研究所,南京210094【正文语种】中文【中图分类】U448.27拉索作为结构的主要承重构件在工程中得到了广泛应用,拉索张力的大小直接关系到结构的受力状况。
一种压杆稳定计算的通用算法
作者:崔清洋, 郭少春
作者单位:崔清洋(盐城工学院建工系,盐城,224003), 郭少春(宁夏大学土木与水利学院,银川,750021)
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本文链接:/Conference_6152889.aspx。
浮基两刚体模型强迫振动动力响应分析王丙;江召兵;陈徐均;黄亚新【摘要】为分析浮基在外力作用下产生的强迫振动对浮基多体系统动力响应影响,将浮基多体系统简化为光滑铰接的两刚体模型,用多体动力学离散时间传递矩阵理论,并编写程序对浮基多体系统动力响应求解。
分别计算浮基在周期横摇角强迫振动与波浪作用下浮基两刚体动力响应,获得浮基两刚体系统运动响应曲线。
数值模拟结果表明,当横摇角强迫振动幅值、频率增加时,起吊重物的摆动更剧烈,绳索长度变化对重物摆动影响不大。
在横向规则波作用下,浮基与重物的摆动幅值随绳索长度、吊臂仰角的增加而增大,随起吊重物质量变化先增大后减小。
%In order to analyze the influence of forced vibration on dynamic responses of a multi-body system with floating base,the system was simplified into a two rigid-body model connected by smooth joint.The dynamic responses ofthe system were solved by using the transfer matrix theory of multi-body dynamics.The time histories of motion of the system were obtained under the condition of the floating base acted by forced periodic rolling motionor waves.The results of numerical simulation show that the swing of the lifted weight becomes severe with the increase of amplitude and frequency of the forced vibration,but is not influenced by the length variation of the rope.The oscillation amplitudes of the floating base and the lifted weight under the action of transverse regular wave increase with the increase of the rope length and arm elevation.【期刊名称】《振动与冲击》【年(卷),期】2014(000)002【总页数】6页(P168-172,177)【关键词】浮基两刚体系统;传递矩阵;强迫振动;动力响应【作者】王丙;江召兵;陈徐均;黄亚新【作者单位】解放军理工大学野战工程学院,南京 210007;解放军理工大学野战工程学院,南京 210007; 上海交通大学船舶海洋与建筑工程学院,上海 200240;解放军理工大学野战工程学院,南京 210007;解放军理工大学野战工程学院,南京 210007【正文语种】中文【中图分类】U661.3浮基两刚体系统为最简单的浮基多体系统。