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Abstract
Compliant Mechanism has been designed for various types of application to transmit desired force and motion. In this study, we have explored an application of Compliant Mechanism for passive vibration isolation systems, for which compliant isolator is used to cancel undesired disturbance, which results in attenuated output amplitude. The Compliant Mechanism is equipped with isolator, which acts as a transmission of force, in order to control the amount of displacement transmitted from it. Compliant Mechanism also used as passive vibration isolator. Here, introducing compliance into the connection, the transmission of applied forces is reduced at some frequencies, at the expense of increasing transmission at other frequencies. The force transmissibility is numerically identical to the motion transmissibility. In order to find the flexible building blocks for force transmissibility, structural optimization approach is applied. The Structural optimization approach focuses on the determination of the topology, shape and size of the mechanism. Thus approach is used to establish the actuator model of the block and it is validated by commercial Finite Element software. A library of compliant elements is proposed in FlexIn. These blocks are in limited number and the basis is composed of 36 elements. The force transmitted to the rigid foundation through the isolator is reduced to avoid transmission of vibration to other machines. Thus the preliminary results of FEA from ANSYS demonstrate that the compliant mechanism can be effectively used to reduce the amount of force transmitted to the surface.
Highlights
Δst Static deflection, mm k Stiffness, N/m2 m Applied mass, kg X Displacement amplitude, mm c Damping coefficient ω Forcing frequency, rad/sec ωn Natural frequency, rad/sec I area moment of inertia, mm[4] L Length of strip, mm R Frequency ratio η Isolation efficiency T r Transmissibility ratio FT Force transmitted, kN E Young’s modulus, N/m2
We explore an application of compliant mechanisms for passive vibration isolation systems
Compliant mechanism is designed for passive vibration isolation system (PVIS)
Summary
Δst Static deflection, mm k Stiffness, N/m2 m Applied mass, kg X Displacement amplitude, mm c Damping coefficient ω Forcing frequency, rad/sec ωn Natural frequency, rad/sec I area moment of inertia, mm[4] L Length of strip, mm R Frequency ratio η Isolation efficiency T r Transmissibility ratio FT Force transmitted, kN E Young’s modulus, N/m2. Homogenization based topology optimization is the basis for the design technique proposed in this research.[2,3,4] Topology and size optimization methods are used to design compliant mechanisms, and the design procedure followed is based on the size optimization of the beam-element abstraction derived from the continuum topology solution.[5] The topology optimization problem is formulated as a problem of finding the optimal distribution of materials in an extended fixed domain where some structural cost function is maximized.[6,7] This work of topology optimization is carried out using ANSYS;[8,9] by this, the optimum material distribution is obtained.[10] the structural optimization[11] is done using flexible building blocks[12] designed by FlexIn Corporation These elements are arranged in such a manner that to reduce the amount of force transmitted the trial and approximation method is used. The building blocks are used to optimize a structure for force transmission
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