Linear ultrasonic motor for absolute gravimeter

被引:36
作者
Jian, Yue [1 ,2 ]
Yao, Zhiyuan [1 ]
Silberschmidt, Vadim V. [2 ]
机构
[1] Nanjing Univ Aeronaut & Astronaut, State Key Lab Mech & Control Mech Struct, Nanjing 210016, Jiangsu, Peoples R China
[2] Loughborough Univ, Wolfson Sch Mech & Mfg Engn, Loughborough LE11 3TU, Leics, England
基金
美国国家科学基金会;
关键词
Linear ultrasonic motor; Absolute gravimeter; Clamping method; Design; TRANSDUCER;
D O I
10.1016/j.ultras.2017.01.023
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
Thanks to their compactness and suitability for vacuum applications, linear ultrasonic motors are considered as substitutes for classical electromagnetic motors as driving elements in absolute gravimeters. Still, their application is prevented by relatively low power output. To overcome this limitation and provide better stability, a V-type linear ultrasonic motor with a new clamping method is proposed for a gravimeter. In this paper, a mechanical model of stators with flexible clamping components is suggested, according to a design criterion for clamps of linear ultrasonic motors. After that, an effect of tangential and normal rigidity of the clamping components on mechanical output is studied. It is followed by discussion of a new clamping method with sufficient tangential rigidity and a capability to facilitate pre-load. Additionally, a prototype of the motor with the proposed clamping method was fabricated and the performance tests in vertical direction were implemented. Experimental results show that the suggested motor has structural stability and high dynamic performance, such as no-load speed of 1.4 m/s and maximal thrust of 43 N, meeting the requirements for absolute gravimeters. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:88 / 94
页数:7
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