| Wearable human motion generating means may utilize the body’s kinetic energy into electrical energy,and for the human body wearable electronic power supply apparatus.This can reduce environmental pollution and energy consumption in production and use for wearable devices that require replacement of micro-batteries or frequent charging.Dielectric Elastomer(DE)is a special electroactive polymer material,which usually has the functions of force-electricity sensing,electric drive and power generation.Compared with other power generation functional materials,the characteristics of high energy density,light weight,high elasticity,high dielectric,variability and large degree of variability,make it have greater research and application potential in the field of power generation functional materials,and gradually It has received the attention and attention of many relevant experts at home and abroad.The main work of this paper is as follows:1.Based on the extreme position of the knee joint in the movement of the lower limbs of the human body,the mechanical part of the rotary-type dielectric elastomer kneepad power generation device is designed.By searching and collecting the static shape and motion law of the human knee joint,the parameters of the rotary power generating mechanism were selected and optimized,and the mechanical stretch part of the rotary dielectric elastomer kneepad power generating device was trial-produced and installed on the kneepad.The final designed device theoretically has 127.2mW generating power.2.In order to increase the power generation of the knee power generating device,it is necessary to increase the stretching magnification of the dielectric elastic body in the device,and thus a displacement multiplying pulley block type displacement amplifying mechanism is proposed.The mechanism can magnify the displacement of the dielectric elastic body in a straight line by a fixed multiple according to the winding law of the pulley block,thereby increasing the power generation of the dielectric elastic body under the condition of a certain knee displacement.In order to verify the feasibility of this mechanism,two types of pulley block displacement amplification mechanisms are used to carry out the force-displacement test of DE.stretching,and the results are analyzed.According to the results,the optimal 3 times displacement magnification mechanism is obtained and the mechanism design scheme is determined.Finally,a device that can theoretically emit 172.5mW is obtained.3.In order to carry out a variety of DE tensile tests,a new type of planar biaxial tensile test device was designed and produced,and the mechanical properties and power generation performance of DE materials in pure shear tensile mode were tested.Through the control of different stretching distances,the corresponding DEG power generation peak waveform image and the highest voltage value,as well as the relative stretching force and capacitance value are obtained.According to the measured data,the power generation,mechanical energy consumption and electromechanical conversion efficiency under different stretching distances are calculated.Among them,DE material has the highest voltage peak value(120V)when it is sheared and stretched by 25mm.And analyze the DE retraction speed and the peak voltage,the amount of charge and the amount of power generation in the DEG.It is obtained that the DEG power generation is proportional to the DE retraction speed and the stretched area,and these two influencing factors have a synergistic effect.Then,the equivalent power generation tests were carried out on the two DE tensile power generation mechanisms,and the power generation-related characteristics of the two power generation devices were analyzed.Finally,the 3 times type pulley displacement amplification mechanism is selected as the drag mechanism of the power generation knee pad and further optimized according to the experimental data.Theoretically,the power generation power is 147.1 mW. |
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