Research On Static Model Of Virtual Human In Traffic Lifting Operation Scenario

Material handling is a common task for workers in the transportation industry and an important cause of bone injury.The whole body static biomechanical model modeling method based on virtual human is the theoretical basis for analyzing the human factor index in the process of industrial tasks.It is also a key technology in the application of occupational biomechanics in industrial lifting operations.It can be used to predict multidimensional mechanical data of human body,evaluate the suitability of working tasks,and achieve the purpose of improving the working mode of workers.Related research has a history of nearly 100 years in developed countries.Although the application ecology of human biomechanical model and supporting simulation system is widely distributed and the demand for autonomy and control is strong in China,due to the relatively weak theoretical and algorithmic foundation,domestic research mainly focuses on the design and application of foreign existing models or the research of single technologies related to virtual human,lacking the research of basic algorithm model.To solve the above problems,based on improving the work experience of employees in the transportation industry,this thesis focuses on the study of human body static biomechanical model as the basic algorithm model for virtual human ergonomics analysis.The main work contents are as follows:(1)Construction of object-oriented whole body static biomechanical model.In this thesis,based on the analysis of human bone structure,a virtual human connection system was established,relevant anthropometric parameters were defined,and a whole body static biomechanical model was constructed by applying mechanics principles.The model calculated the force and moment at human joints,average strength,maximum load of hand,etc.(2)Construction of common human posture database in transportation industry.Through a questionnaire survey,the common lifting posture of employees in the transportation industry was selected,and the whole body static biomechanical model was introduced to construct the common human posture database in the transportation industry.(3)Development of static biomechanical model testing environment for human body.The Ergonomic Component(ERG)was developed,which combined with the wearable motion capture device to realize the mapping from real human to virtual human,and the real human experimental environment was established.(4)Reliability verification experiment and model application simulation experiment of human body static biomechanical model.The reliability of the whole body static biomechanical model was preliminarily tested and evaluated by using the human data in the posture database,and the model was applied to predict and analyze the relevant human mechanical parameters in the lifting operation scenario.The comparison results with the industrial ergonomic software Jack show that the output of test prototype system ERG is consistent with that of Jack software,which proves the reliability of the whole body static biomechanical model constructed in this thesis.The simulation results of industry application of the model show that: under the same load,different postures correspond to different maximum joint load and hand load,and the working posture should be adjusted to adapt to the load.Standing or bending the leg has little effect on the maximum load capacity of the hand.Forearm extension leads to reduced hand load capacity;Reaching forward with the upper arm can lead to a significant reduction in the load capacity of the hand;A two-handed load can withstand a greater hand load than a one-handed load.