科研之友
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摘要
To overcome the disadvantages of the traditional vibration system used in a horizontal dynamic balancing machine, based on the principle of the instantaneous motion centre in theoretical mechanics, a novel two-degree-of-freedom vibration system comprising two non-parallel four-bar linkages in series is designed to improve the plane separation effect and minimum achievable residual unbalance for dynamic balancing measurement of an outboard rotor. The structure characteristics and unbalancing response of this vibration system are analysed in depth. The plane separation equations are derived. Theoretical analyses show that this vibration system integrates the advantages of both the overhanging beam structure and simple-supported beam structure, and its vibration centre keeps at the instantaneous motion centres, with the result that the balancing efficiency and plane separation performances are improved. Moreover, to improve the sensitivity of the vibration system, the distance between measuring planes is increased by adjusting the angles of two four-bar linkages. The transducers are installed on the same measuring plane; thus, the performance difference in transducers caused by environment fluctuation is reduced and the force coupling effect is eliminated. The result for this vibration system in long-term operation is a more accurate measurement with a lower requirement for a second correction run. The final experimental results validate the superiority of this vibration system in plane separation performance, minimum achievable residual unbalance, and repeatability.
- 出版日期2009-2
- 单位上海交通大学
