共查询到20条相似文献,搜索用时 0 毫秒
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Song KongjieZhang BingSun LinglingSun YuguoSchool of Mechanical Engineering Shandong University Jinan China 《机械工程学报(英文版)》2003,16(4):408-410,416
Passive-active control of a flexible isolation system is investigated from the viewpoint ofpower flow. Dynamic transfer equations of the system are deduced based on a matrix method whichuses mobility or impedance representations of three substrictures: the source of vibration, the receiverand the mounting system which connects the source to the receiver The cancellation of axial inputforces to the receiver is considered as the active control strategy and its effects are discussed. Theresults of the study show that the strategy adopted herein can effectively reduce the power transmittedto the receiver. 相似文献
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微制造隔振平台振动的模糊广义预测控制 总被引:1,自引:0,他引:1
采用主动隔振与被动隔振相结合的技术,建立以空气弹簧为被动隔振元件、超磁致伸缩致动器为主动隔振元件的微制造平台6自由度隔振系统及其结构模型。提出一种改进的自适应广义预测控制算法,并与模糊控制结合起来,应用于微制造平台的振动控制中,实现广义预测控制与模糊控制的优势互补。计算机仿真与试验结果表明,所设计的微制造平台模糊广义预测控制系统具有良好的鲁棒稳定性、抗干扰能力和时域性能,可在非常宽的频率范围内将由干扰所引起的微制造平台的振动在被动隔振的基础上减少80%左右,效果显著。 相似文献
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0INTRODUCTIONVibrationtransmissionfromamachinesourcetoflexiblesupportingstructuresandtheasociatedsoundradiationfromthevibrat... 相似文献
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Xiong Yeping 《机械工程学报(英文版)》1999,12(2)
A new concept, namely, the equivalent mobility matrix of coupling subsystem is proposed, and the corresponding three-subsystem coupling progressive approach is explored. With the new efficient approach presented, the complexity in dealing with a more complicated dynamic coupling system is greatly reduced. The new modeling method is then combined with the theory of power flow to investigate the dynamics of the overall non-rigid isolation system from the viewpoint of energy. The interaction between the resilient machine of its main modes and the resonant behavior of the flexible foundation on power flow transmission is studied. Taking a machine tool mounted on a multi-story working plant as an example, the dynamic characteristics of the machine-foundation coupling system are analyzed, and their effects on power flow transmission are revealed under various service frequency bands. Some advisable control strategies and the design principle for machinery mounted on flexible structure are proposed. 相似文献
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将主动隔振技术应用到双层精密隔振系统中,设计双层主动隔振系统,建立其动力学方程和状态方程。根据精密制造和精密仪器的隔振需求,提出控制目标,建立系统的线性二次型调节器(linear quadratic regulator,LQR)最优控制模型,利用Matlab/Simulink软件进行仿真分析,在不同激励下研究主被动系统隔振对象的加速度响应大小。仿真结果表明:双层主动隔振系统的隔振效果远远优于被动隔振系统。 相似文献
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某机载雷达中晶体振荡器隔振系统弹性特性研究 总被引:3,自引:0,他引:3
从振动对雷达频综器中晶体振荡器的影响入手,分析晶体振荡器在随机振动条件下的相位噪声。并根据某机载雷达所处的恶劣的力学环境和苛刻的安装条件,利用隔振理论,对晶体振荡器隔振系统的弹性特性进行设计。试验证明,对某机载雷达频综器中晶体振荡器的隔振系统的弹性特性研究和对其采取的隔振措施是行之有效的。不仅解决了现有机载隔振系统存在的问题,而且该隔振系统还适用于各种机载雷达的晶体振荡器。 相似文献
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新型动静压挤压油膜阻尼器对柔性转子系统振动的控制 总被引:1,自引:0,他引:1
为改善传统动压挤压油膜阻尼器油膜力高度非线性的不足,提出了一种新型的动静压挤压油膜阻尼器结构。在推导出新型动静压挤压油膜阻尼器油膜力近似解的基础上,从理论及试验上研究了新型动静压挤压油膜阻尼器对柔性转子系统振动的控制能力。 相似文献
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OPTIMUM CONTROL OF VIBRATION AND STRUCTURE-BORNE NOISE FOR MACHINERY ON FLEXIBLE FOUNDATION 总被引:2,自引:0,他引:2
OPTIMUMCONTROLOFVIBRATIONANDSTRUCTURE-BORNENOISEFORMACHINERYONFLEXIBLEFOUN-DATIONOPTIMUMCONTROLOFVIBRATIONANDSTRUCTURE-BORNEN... 相似文献
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POWER FLOW TRANSMISSION OF AN ASYMMETRICAL FLEXIBLE SYSTEM EXCITED BY AN OFF-CENTRE FORCE 总被引:9,自引:0,他引:9
《机械工程学报(英文版)》1999,(3)
0INTRODUCTIONInpracticalengineering,moreandmoreatentionisbeingpaidtotheseriousproblemscausedbythenonrigidfoundationsofvibrat... 相似文献
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Sun Yuguo Song Kongjie College of Optic Electronic Information Engineering University of Shanghai for Science Technology Shanghai China College of Mechanical Engineering Shandong University Jinan China 《机械工程学报(英文版)》2004,17(2):219-221
In shipping and aircraft engineering, the vibrating motor or intrumentation is usuallymouned on a non-rigid base. To apply isolation design effectively it is necessary to investigate thenature vibration characteristics of the rigid motor, flexible base coupled system. A universal dynamicexpress for the coupled system is derived. A PC-based measurement solution is presented. And thesystem's dynamic behavior is then investigated numerically and experimentally. The results show thata strong interaction will exist between the motor's rigid mode and the flexible base's mode when themotor's mounting frequency is close to the flexible base's first natural frequency. The first naturalfrequency of the coupled system is generally lower than the metor's rigid mode frequency. At highfrequency, the fiexible base's modes are the dominant modes of the coupled system. 相似文献
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0 INTRODUCTIONContinuous isolators play more and moreimportant roles in modern industry and everyday life.Investigation of modeling and dynamics on discreteisolation systems is mature while that about the..continuous isolation systems is almost i.iti.l[1--4].Pinnington['] analyzed the vibrational POwertransmission in the infinite continuous isolationsystem of syTnmetry. It is found that the power inputto the machine vastly exceeds that input to thefOundation. Sno.dO.[6] studied the vibr… 相似文献
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广义Ruzicka隔振系统的简谐振动隔离研究 总被引:2,自引:0,他引:2
提出广义Ruzicka隔振系统的概念,该系统在实际工程系统中有广泛应用,如铁路机车车辆和汽车的隔振系统中。通过建立广义Ruzicka隔振系统的运动方程,导出简谐激励下隔振系统的绝对传递率,而简单隔振系统和Ruzicka隔振系统则可作为广义Ruzicka隔振系统的特例。取铁路客车的1/4车体模型作为应用实例,研究Ruzicka和广义Ruzicka隔振系统的简谐隔振性能,并对参数的影响进行分析。 相似文献
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针对主动隔振系统存在非线性的情况,提出一种神经网络控制方法.控制器采用CMAC(cerebellar model articulation control)网络,参数调整基于梯度下降法.为消除系统次通道对控制器参数调整的影响,利用BP(back propagation)网络离线辨识得到次通道模型.系统的输出误差信号与次通道模型参数相结合,共同调整控制器参数.仿真结果表明,该控制方法对于存在非线性的主动隔振系统具有良好的控制效果,隔振能力超过常用的滤波LMS(least mean square)方法. 相似文献