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Effectiveness of a Passive-active Vibration Isolation System with Actuator Constraints

Chinese Journal of Mechanical Engineering 2014年第3期27卷 567-574页

作者： SUN Lingling SUN Wei song kongjie HANSEN Colin H Key Laboratory of High-efficiency and Clean Mechanical Manufacture Shandong University School of Mechanical Engineering University of Adelaide

In the prediction of active vibration isolation performance, control force requirements were ignored in previous work. This may limit the realization of theoretically predicted isolation performance if control force of large magnitude cannot be supplied by *** behavior of a feed-forward active isolation system subjected to actuator output constraints is investigated. Distributed parameter models are developed to analyze the system response, and to produce a transfer matrix for the design of an integrated passive-active isolation system. Cost functions comprising a combination of the vibration transmission energy and the sum of the squared control forces are proposed. The example system considered is a rigid body connected to a simply supported plate via two passive-active isolation mounts. Vertical and transverse forces as well as a rotational moment are applied at the rigid body, and resonances excited in elastic mounts and the supporting plate are analyzed. The overall isolation performance is evaluated by numerical simulation. The simulation results are then compared with those obtained using unconstrained control strategies. In addition, the effects of waves in elastic mounts are analyzed. It is shown that the control strategies which rely on tmconstrained actuator outputs may give substantial power transmission reductions over a wide frequency range, but also require large control force amplitudes to control excited vibration modes of the system. Expected power transmission reductions for modified control strategies that incorporate constrained actuator outputs are considerably less than typical reductions with unconstrained actuator outputs. In the frequency range in which rigid body modes are present, the control strategies can only achieve 5-10 dB power transmission reduction, when control forces are constrained to be the same order of the magnitude as the primary vertical force. The resonances of the elastic mounts result in a notable increase of

关键词： passive-active isolation transfer matrix control effort constraint feedforward control

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General Model to Predict Power Flow Transmitted into Laminated Beam Bases in Flexible Isolation Systems

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Chinese Journal of Mechanical Engineering 2009年第2期22卷 227-232页

作者： NIU Jtmchuan GE Peiqi HOU Cuirong LIM C W song kongjie School of Mechanical Engineering Shandong University Jinan 250061 China School of Environmental Science andEngineering Shandong University Jinan 250100 China Department of Building and Construction City University of Hong Kong Hong Kong China

For estimating the vibration transmission accurately and performing vibration control efficiently in isolation systems, a novel general model is presented to predict the power flow transmitted into the complicate flexible bases of laminated beams. In the model, the laminated beam bases are simulated by the first-order shear deformation laminated plate theory, which is relatively simple and economic but accurate in predicting the vibration solutions of flexible isolation systems with laminated beam bases in comparison with classical laminated beam theories and higher order theories. On the basis of the presented model, substructure technique and variational principle are employed to obtain the governing equation of the isolation system and the power flow solution. Then, the vibration characteristics of the flexible isolation systems with laminated bases are investigated. Several numerical examples are given to show the validity and efficiency of the presented model. It is concluded that the presented model is the extension of the classical one and it can obtain more accurate power flow solutions.

关键词： power flow vibration isolation plate theory flexible system

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PASSIVE-ACTIVE CONTROL OF POWER FLOW IN AN ISOLATION SYSTEM MOUNTED ON FLEXIBLE FOUNDATIONS

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Chinese Journal of Mechanical Engineering 2001年第2期14卷 111-115页

作者： Huo Rui Shi Yin Institute of Naval Ship Equipment Noise & Vibration, Naval University of Engineering song kongjie Shandong University of Technology 解放军海军工程大学动力工程学院湖北武汉山东工业大学山东

A general model of flexible isolation systems which involves both the passive and active control factors is established by inserting actuators into an passive isolation system. And the power flow transmission function in such a system as with multi disturbance, multi mounts, passive isolators and actuators is deduced. By means of the numerical simulation method, the influence of actuators on power flow transmission characteristic is studied. And as a conclusion, the passive active synthetic control strategy of power flow is summarized.

关键词： Vibration isolation Power flow Coupling Active control

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OPTIMUM CONTROL OF VIBRATION AND STRUCTURE－BORNE NOISE FOR MACHINERY ON FLEXIBLE FOUNDATION

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Chinese Journal of Mechanical Engineering 1996年第1期9卷 13-20页

作者： Xiong Yeping song kongjie Wang Chun ( Shandong University of Technology)

Faced with the key problems of machinerv- induced vibration and structure-borne noise when dynamic machines are mounted on flexible foundations such as upper floors of facto- ry buildings, the vibration and noise transmission mechanism and optimal control for the flexible system are systematically studied by the novel approach of power flow. A more general system of machinery-isolators一flexible foundation is modelled. Based on substructure transfer matrix tech- nique the power flow input and transmitted are formulated in closed forms, and the effects that the flexibility of foundation and the asymmetricity of system have upon the power flow transmis- sion spectra are revealed, Also the inverse problems of isolation design are discussed by using an optimum method. Optimum design for a typical example about a force fan mounted on a con- crete building floor is successfully performed to show that the model is practical, the theory and the optimisation developed are reasonable and effective. Thereby, theoretical bases for accurate prediction of isolation effectiveness and an optimum method for practical design of a general flexi- ble isolation system are provided.

关键词： Power flow Structure-borne nosie Flexible subsystems Optimum control

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POWER FLOW ANALYSIS FOR THE FINITE CONTINUOUS ISOLATION SYSTEMS

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Chinese Journal of Mechanical Engineering 2001年第3期14卷 215-218页

作者： Mao Yinghong,song kongjie,Sun Yuguo (Institute of Sound and Vibration , Shandong University)

A universal expression for the transmitted power to the flexible foundation via the finite continuous isolation system of asymmetry is derived where the concept of effective mobility for the coupled system with continuous contact points is put forward. On the basis of the theoretic calculation and analysis, effects of structure parameters of the system on the power flow transmission as well as on the isolation efficiency are fully investigated.

关键词： Power flow Finite system of asymmetry Continuous isolator

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多激励多支承全柔性隔振系统的传递特性分析

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机械工程学报 2011年第7期47卷 59-64页

作者：牛军川宋孔杰吉林大学汽车动态模拟国家重点实验室长春130025 山东大学机械工程学院济南250061

现代机械的高速化和轻量化的发展趋势导致了更加严重的振动噪声问题,因此柔性系统的高频隔振降噪是机械设计过程中必须要考虑的问题。充分考虑机械系统的柔性性质,采用子结构导纳综合法和传递矩阵技术,建立多激励多支承的柔性机器和柔... 详细信息

现代机械的高速化和轻量化的发展趋势导致了更加严重的振动噪声问题,因此柔性系统的高频隔振降噪是机械设计过程中必须要考虑的问题。充分考虑机械系统的柔性性质,采用子结构导纳综合法和传递矩阵技术,建立多激励多支承的柔性机器和柔性基础(Flexible machine and flexible base,FMFB)全柔性隔振系统的一般动力学模型和力学描述,该模型不但包含了刚性机器和刚性基础(Rigid machine and rigid base,RMRB)、刚性机器和柔性基础(Rigid machine and flexible base,RMFB)、柔性机器和刚性基础(Flexible machine and rigid base,FMRB)等多种隔振模型,而且还可以借助该模型分析积极隔振和被动隔振等问题。通过系统综合,给出适合于不同隔振系统的传递率和功率流表达式,探讨各类柔性系统的固有频率耦合规律,并研究它们的振动传递特性等问题,得到了一些有价值的结论,对柔性隔振设计具有重要的指导意义。

关键词：功率流传递率柔性系统振动隔离

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复杂机械系统多维耦合振动传递矩阵分析

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机械工程学报 2005年第4期41卷 38-43页

作者：孙玲玲宋孔杰山东大学机械工程学院济南250061

以特性传递矩阵描述复杂机械系统中子结构输入、输出力与速度矢量关系,提出了复杂振源激励、多弹性支承与基础板结构三维耦合隔振系统传递矩阵力学模型。考虑隔振支承多维波动效应,推证了弹性支承耦合振动传递矩阵,为复杂系统功率流特... 详细信息

以特性传递矩阵描述复杂机械系统中子结构输入、输出力与速度矢量关系,提出了复杂振源激励、多弹性支承与基础板结构三维耦合隔振系统传递矩阵力学模型。考虑隔振支承多维波动效应,推证了弹性支承耦合振动传递矩阵,为复杂系统功率流特性及隔振器多维驻波效应研究确立了有效途经。数值模拟计算表明,基础板结构的前两阶弯曲共振模态是高频域系统功率流提高的主要原因。振源力矩或垂向激振力诱发的隔振器纵向谐振使系统功率流明显提高:增大基础板厚度,驻波共振峰值提高。

关键词：驻波隔振传递矩阵功率流

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机器-基础耦合振动功率流传递最优控制

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振动与冲击 2007年第1期26卷 117-120页

作者：孙玉国宋孔杰上海理工大学光学与电子信息学院上海200093 山东大学机械工程学院济南250061

建立了机器-基础耦合振动状态空间方程,对系统的耦合振动特性与模型降阶进行了研究。给出了状态观测器构造的一般方法。从功率流传递的角度,对模态耦合振动线性二次调节器(LQR)控制效果进行了评估。数值计算表明:机器-基础的耦合振动主... 详细信息

建立了机器-基础耦合振动状态空间方程,对系统的耦合振动特性与模型降阶进行了研究。给出了状态观测器构造的一般方法。从功率流传递的角度,对模态耦合振动线性二次调节器(LQR)控制效果进行了评估。数值计算表明:机器-基础的耦合振动主要表现为机器Z向模态与基础第一阶弯曲模态的耦合振动。以模态速度为LQR控制指标可有效地衰减共振频率处功率流传递、阶跃响应收敛时间较短。

关键词：功率流主动隔振线性二次调节器模态速度

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仪器—基础耦合振动固有频率偏移

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仪器仪表学报 2006年第Z2期27卷 1112-1113页

作者：孙玉国宋孔杰上海理工大学光学与电子信息工程学院上海200093 山东大学机械工程学院济南250061

针对柔性基础上精密仪器的隔振设计问题,对仪器-基础耦合振动刚度矩阵进行了求解。对耦合系统的固有频率偏移进行了数值计算。研究表明:耦合系统基频小于仪器的安装频率。在低频段,仪器纵向振动刚体模态与基础第1阶弯曲模态动力耦合效... 详细信息

针对柔性基础上精密仪器的隔振设计问题,对仪器-基础耦合振动刚度矩阵进行了求解。对耦合系统的固有频率偏移进行了数值计算。研究表明:耦合系统基频小于仪器的安装频率。在低频段,仪器纵向振动刚体模态与基础第1阶弯曲模态动力耦合效应明显。

关键词：隔振精密仪器柔性基础耦合振动

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Investigation of power flow in a continuous floating raft isolation system

引用

Chinese Journal of Acoustics 2001年第2期20卷 156-162页

作者： song kongjie, MAO Yinghong (Shandong University of Technology Jinan 250061) LIN Li (Syster Engineering Research Institute Beijing 100036) Shandong University of Technology Jinan 250061 System Engineering Research Institute Beijing 100036

A general dynamic model of a floating raft isolation system with multiple machines and supports is established. Considering the coupling of the foundation in high frequency and basing on the mobility analysis of substructures, the expression of the power flow transmission spectrum of the finite continuous isolation system of asymmetry is derived. At the same time the mathematical calculation and analysis by figure are made to find the rules related to the isolation effect in the case of different parameters of the system.

关键词： flow

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