办公椅靠背形态参数对体压分布的影响OA

To study the impact of office chair backrest parameters on the human body pressure distribution and comfort,and to determine the optimal design range for backrest parameters,the authors first consulted relevant standards and conducted a questionnaire survey to investigate common backrest parameters,office chair back types,materials,and commonly used sitting postures.Based on the collected data,parameter measurements were performed on 71 office chair backrests of the corresponding types and materials.Finally,25 office chairs with a single-mesh fabric backrest were selected for experimental analysis.Using 3D scanner equipment,the office chair backrest parameters were extracted,recorded,and organized.Twelve suitable subjects were tested for backward sitting body pressure distribution,while simultaneously completing a subjective comfort evaluation form.The collected body pressure distribution data were processed using MATLAB software to extract relevant indicators,followed by mathematical statistical analysis.The analysis results showed the upper half of the backrest of the horizontal radius R1,the lower half of the horizontal radius R2,and the upper half of the backrest of the longitudinal radius r1.All three parameters were significantly correlated with the body pressure distribution index,which are important parameters affecting the backrest body pressure distribution of the mesh and body pressure distribution index.It can be concluded that these three office chair backrest parameters are important morphological parameters that affect the pressure distribution of the backrest in the single back of the network.When the parameters of the office chair increased,the corresponding body pressure distribution index showed the same change trend,that is,at first decrease and then increase,and the valley value was located in the middle.The subjective comfort level was higher across all parameters,providing a scientific basis for the parameter design of the office chair backrests.When designing backrest parameters,it is essential to avoid extremes in size and aim for a balanced,medium range.Specifically,the recommended design ranges are as follows:the horizontal radius of the upper backrest should be 844.00-1 786.60 mm,the longitudinal radius of the upper backrest should be 855.00-1 503.00 mm,and the horizontal radius of the lower backrest should be 640.00-930.25 mm.