力学与实践 ›› 2020, Vol. 42 ›› Issue (4): 442-446.DOI: 10.6052/1000-0879-20-022

• 应用研究 • 上一篇    下一篇

扁担挑物的动力学分析

刘荣梅1)   

  1. 南京航空航天大学航空学院,南京210016
  • 收稿日期:2020-01-14 出版日期:2020-08-20 发布日期:2020-08-25
  • 通讯作者: 1)刘荣梅,副教授,主要研究方向为工程力学。E-mail: romme@nuaa.edu.cn

DYNAMIC ANALYSIS OF A LOADED SHOULDER-POLE DURING WALKING

Liu Rongmei1)   

  1. College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2020-01-14 Online:2020-08-20 Published:2020-08-25

摘要: 建立了扁担挑物的动力学模型和动力学方程,并进行了数值求解。扁担挑物时存在三种频率,即重物类似于单摆的振动频率、挑运者的步行频率和扁担-重物系统铅垂方向的振动频率。计算结果表明,为了获得较好的挑担体验,三种频率应该相互协调。当人挑担行走的频率为扁担-重物系统铅垂方向振动频率的70%,$\sim$,80%时,肩部铅垂附加动反力为重物重力的30%左右且与肩部铅垂运动同相,当重物类似于单摆的振动频率为人步行频率的25%,$\sim$,30%时,重物的摆角和肩部受到的水平附加动反力均较小,从而有利于人挑担行走。

关键词: 扁担, 动力学, 振动, 频率

Abstract: A dynamic model and the related equations for a loaded shoulder-pole during walking are established. Three frequencies are involved, i.e. the vibration frequency of the load simplified as a pendulum, the walking frequency and the vertical vibrant frequency of the loaded shoulder-pole. Numerical calculation results indicate that in order to make the walking comfortable, the above three frequencies should be coordinated. When the walking frequency is 70%,$\sim$80% of the vertical vibrant frequency of the loaded shoulder-pole, the vertical additional dynamic reaction force on the shoulder is about 30% of the weight of the load and is in the same direction with the vertical moment of the shoulder. When the vibration frequency of the load simplified as a pendulum is 25%,$\sim$30% of the walking frequency, the swing of the loads and the horizontal additional dynamic reaction force on the shoulder are relatively small.

Key words: shoulder-pole, dynamic, vibration, frequency

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