Research On Heavy-duty Commercial Vehicle Ergonomic Design Method And Application

Heavy-duty commercial vehicle is an important part in automobile product catalog, and plays an important role in our national economical construction and social development. In recent years, with rapid development of the Chinese national economy, extensive construction of highway, and development of logistics industry, Heavy-duty truck industry develops rapidly in China. Although domestic commercial vehicle enterprises have the abilities of self-R&D and science and technology innovation, but domestic commercial vehicle enterprises lag behind oversea automobile companies in ergonomic design. From the point of view of vehicle design, the most direct way to improve the active safety of vehicle and working environment of drivers so as to promote the drivers'safety and health, is to design the cab scientifically by using the ergonomic theories.Based on national '863' high-tech development project "Advanced Technology of Integration and Development for Heavy-duty Trucke" (No.2206AA110105), The profound and systematic research works are carried out in this dissertation focusing mainly on the key techniques of Heavy-duty commercial vehicle cab ergonomic design and evaluation method. The major research contents are finished as follows:A summation is conducted for the ergonomic design contents, processes and statistical method of commercial vehicle cab. A ergonomic design method for heavy-duty truck is established.In this dissertation, key techniques of modeling of digital human used for Heavy-duty commercial vehicle ergonomic design and analysis are studied, including anthropometry parameters description, kinematics and dynamics modeling, direct and reverse kinematics for limbs driving and posture calculation, geometric modeling and visualization, performance modeling, etc. A 3D digital human model is built up. By integrating these functions, together with vehicle modeling and ergonomic analysis features, a Heavy-duty commercial vehicle ergonomic design and evaluation system SHOVED(System for Heavy-duty Commercial Vehicle Ergonomic Design) is developedBy using SHOVED, cab concept can be constructed based on the cab parameters inputted, test samples of target population for ergonomic analysis can be generated, comfort of upper and lower extremities can be evaluated considering steering, shift and pedal operations, front and back vision field, A-pillar dead ground, dashboard vision field and mean observation distance, windshield sweep area, and convenience for up-and down truck can be analyzed and evaluated. Results show that ergonomic performance of target vehicle satisfied domestic and SAE standard requirements. A few suggestions are proposed for improving ergonomic performance of the cab further.An improved evaluation method of human body posture comfort is proposed. Human body muscle load is used for objective measurement, and muscle load is calculated according to joint load from macroscopic view. Posture comfort distribution within posture space is obtained by simulation analysis. After statistical analysis is made from posture comfort distribution data, an evaluation model of posture comfort is set up. The about evaluation model of posture comfort is put into practice used for match of point H of heavy-duty truck. A better effect is acquired.A subjective evaluation is conducted by semantic subdivision method to vision field of the cab, interior space, hand contact quality, and driver's manipulation comfort. Results indicate that the ergonomic design scheme of the cab is reasonable, but there is a possibility to made further refinement.The research works in this dissertation will produce an active effect on improving heavy-duty truck product's ergonomic performance and enterprise's technology innovation, design and R&D ability.