Ergonomics Optimization Of Heavy Commercial Vehicle Cab

The adult human body size GB10000-1988 was implemented in 1989 and has not been updated since then.It has been 30 years old.With the improvement of people’s living material level,the size of the human body is gradually increasing.Therefore,the existing data can no longer be directly used as a design basis.At present,domestic heavy commercial vehicles are basically arranged according to the Society of Automotive Engineers’(SAE)standards.The driver’s comfort requirements cannot be met because the driver’s body characteristics are not fully considered.In order to improve such problems,this subject takes a heavy commercial vehicle cab as the research object.On the basis of correcting the human body size of Chinese adults,the focus is on optimizing the driver’s sitting comfort and operating comfort.Firstly,the paper establishes a mathematical model of sitting position,a mathematical model of the position of the steering wheel and a mathematical model of the position of the shift lever.Identify the key limb sizes that affect cab comfort.Based on the GB10000-1988 Chinese human body size,the key body size that affects comfort is corrected.Secondly,the distribution characteristics of the comfort zone of the H-point of the B-type vehicle are systematically studied.Find the position of the comfortable ride reference point(SgRP)for Chinese driving.Fitting the commonly used percentile H point fitness model.The final seat horizontal stroke is determined by taking into account the H-point position of the special crowd,and the driver’s leg space is checked and the seat position is optimized.Then,the system studies the distribution characteristics of the steering wheel center point and proposes three arrangements of the steering wheel.Analyzed the reason why the lower edge of the steering wheel interfered with the driver’s stomach.Optimized from a design perspective.Specifically,it includes calculating the common area of the Chinese driver’s comfortable steering wheel center point;calculating the position of the steering wheel center point under the brake safety constraint,and fitting the Chinese male driver’s hand center point fitness line model;on this basis,establishing and applying The upper limb joint torque and joint comfort model calculates the final range of the steering wheel center point.In addition,the upper and lower field tangent equations of the optimized vehicle are obtained based on the SgRP point and the upper edge point of the steering wheel.After that,for the shift lever arrangement in the class A car,the experiment was designed and the physical measurement method was used to actually measure the angle of the right arm joint that the driver manipulated to each extreme position,and the shift lever position of the heavy commercial vehicle was redefined.Finally,using the CATIA software,the driving posture,the maneuvering posture and the front field of view of the two cab layout schemes before and after optimization are simulated and evaluated,and the final seat SgRP point,the steering wheel center point and the shifting rod arrangement position parameters are determined.The research results of the thesis have certain practical guiding significance in the general layout of the human-machine of the B-type vehicle cab.At the same time,it has certain application prospects in other heavy-duty cab manufacturing enterprises.