Study On The Influence Of Eyepiece Height On Neck Comfort

Although the functions of domestic analytical instruments have reached the advanced level in the world,the ergonomics has not been take n into account in product design,and the comfort,operation efficiency and pleasure of the products have been neglected.As a result,the instruments can’t meet the needs of different application scenarios.With the maturity of electroencephalogram(EEG),electromyogram(EMG)and other technologies,ergonomics evaluation methods have become more diversified.This paper discusses the influence of eyepiece height on neck comfort.Different eyepiece heights were evaluated by eyepiece height analysis,EMG experiment and principal component analysis.And the degree of cervical muscle comfort was evaluated to help designers to optimize the height and size of the eyepiece of the microscope,and adapt to different user scenarios.Firstly,the size of Chinese human body is analyzed,and analytical the operator’s pose with Microscope.The relationship model between the height of comfortable eyepiece and the size of human body is obtained by using ergonomics theory.Then,simulating the Ergonomics based on Jack,creates the digital human model and virtual working environment in the simulation software,and analyses the comfort and physical condition of the virtual human in task operation,which provide a reference for determining the level of independent variables in surface electromyography experiment.Based on the study of human neck structure,the experiments of observing samples at different eyepiece heights were carried out.The surface electromyogram(EMG)signal of subjects in experimental posture were extracted by multi-channel physiological recorder,and the signals were analyzed from time domain,frequency domain,non-linearity,etc.The trend of EMG changing with eyepiece height was explored,and the influence of eyepiece height on neck muscle comfort was explained from different index angles.Finally,the principal component analysis method is used to evaluate the experimental results comprehensively.After dimensionless processing of the data under each index,the Eigenvalue and variance contribution rate are obtained to select the principal component.Finally,the comprehensive score after dimensionality reduction is calculated to obtain the fatigue degree ranking under different eyepiece heights,and to determine the optimal eyepiece height and the rule of neck comfort varying with the eyepiece height.According to the experimental results,the eyepiece height design is optimized.Suggestions are made for the size design of the operating system of the microscope according to the human body size of Chinese adults.The size relationship between the height of the worktable,seat,eyepiece and the ground is clarified,which improves the comfort of the operation of the microscope.At the same time,it can be used as a reference for the design of related instrument products.