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| Study on the Technology of Standard Force Generating Device with Double Levers and Changeable Lever Ratio |
| ZHANG Xue-cheng1,TANG Chun-qian2 |
1.Jilin University, Chuangchun, Jilin 130022, China
2.National Institute of Measurement and Testing Technology, Chengdu, Sichuan 610021, China |
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Abstract A loading way and a device with double levers and a changeable lever ratio is introduced. The device is composed of two levers, one main lever and one ministrant lever. According to the changeable lever ratio principle, force is applied by the main lever while the ministrant lever maintain the initial balance of the entire system. The changeable lever ratio principle indicates that the lever ratio alters via an individual weight moving alone the lever arm. The force applies to the specimen because of the lever ratio alternation. That is, the variational force is applied through controlling the position of the weight. The system restores balance after loading. With the loading method mentioned above, the operation of such device would be simple and the balance state is adjusted naturally at zero. The system force control is realized by precise displacement change, such method results to much wider force value and fewer errors. The frequency of weight move decides the speed of force application, therefore, this device enhances the loading efficiency. The basic principle of the machine is presented in details and the errors analyzed as well. Furthermore, an experiment to a 1MN force standard machine which applies such techniques was conducted. Data and test result are also included . The force value accuracy class 0.01 is achievable according to the test result.
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Received: 08 February 2014
Published: 27 January 2016
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Corresponding Authors:
Xue-cheng ZHANG
E-mail: zxche@163.com
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2016, Vol. 37 
