Design analysis and experiment of double simply-supported cantilever beam-type anti-resonant vibration isolator
[Objective]To explore the implementation of a three-element-type anti-resonant vibration isolat-or,a mechanical device is proposed which is composed of a double simply-supported cantilever beam connect-ing to a mass block at the cantilever end and a double supported beam,i.e.,beam-type anti-resonant vibration isolator(BAVI).[Mehtods]First,the dynamic characteristics of the double simply-supported cantilever beam are analyzed and the impedance equation deduced.Based on the driving point impedance function,a low-order dynamic model of the double simply-supported cantilever beam is synthesized,which is a series model consisting of a single inertial volume and a single spring.The analytical solution of the equivalent para-meters for the low-order dynamic model is also obtained.The isolator prototype is then made and the test is conducted.The experimental results validate the anti-resonant characteristics of the isolator device,and the ef-fectiveness of the theoretical analysis is also verified.Furthermore,research on the stiffness characteristics and effects of different types of damping is carried out.[Results]The dynamic model of the isolator device ac-cords with the three-element-type model when the span ratio is less than 1/6,and the isolator device has high static stiffness and low dynamic stiffness.By implementing one damping measure on the double simply-supported cantilever beam,the resonance can be absorbed while the transmissibility in the isolation frequency region attenuates at the maximum rate.[Conclusion]The results of this study prove the realizability of the three-element-type anti-resonant vibration isolator,and the proposed mechanical device provides a simple and feasible implementation in engineering.
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