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Implementation of a Sensor to Detect the Foot-pushing Force for an Agricultural Transport-convenience Vehicle

농업용 이동편의장치를 위한 발로 미는 힘을 감지하는 센서 구현

  • Seung-hee, Baek (Department of Bio ICT Engineering, Graduate School, Andong National Unversity) ;
  • Ik-hyun, Kwon (Department of Electrical and Electronic Education, Andong National Unversity) ;
  • Cheong-worl, Kim (Department of Electrical and Electronic Education, Andong National Unversity)
  • 백승희 (안동대학교 대학원 바이오 ICT 융합공학과) ;
  • 권익현 (안동대학교 전기전자교육과) ;
  • 김청월 (안동대학교 전기전자교육과)
  • Received : 2022.09.28
  • Accepted : 2022.10.26
  • Published : 2022.11.30

Abstract

In this paper, we propose a sensor with a C-shaped load cell to detect force change when a person sitting on the chair in an electrical transport-convenience vehicle is pushing ground by both heels. The load cell built in the vehicle is mechanically deformed by the vertical force owing to the human weight and the horizontal force by ground-pushing feet. The deformation rate of the load cell and its distribution are simulated using finite element analysis. In the simulation, the applied loads are preset in the range of 10 kg - 100 kg with a step size of 10 kg, and the ground-pushing force by feet is increased to 40 N with a step size of 5 N with respect to each applied load level. The resistance change of the load cell was observed to be linear in simulation as well as in measurement. the maximum difference between simulation and measurement was 0.89 % when the strain gauge constant was 2.243. The constant has a large influence on the difference. The proposed sensor was fabricated by connecting an instrument amplifier and a microcontroller to a load cell and used to detect the force by ground-pushing feet. To detect foot driving, the reference signal was set to 130% of the load, and the duration of the sensor output signal exceeding the reference signal was set to 0.6 s. In a test of a vehicle built with the proposed sensor, the footpushing force by the worker could be successfully detected even when the worker was working.

Keywords

Acknowledgement

이 논문은 안동대학교 기본연구지원사업에 의하여 연구 되었음.

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