Abstract: Abstract: In view of the unreasonable layout of operating elements in large mining excavators, the elements of the man-machine interface of the excavator cab were quantitatively analyzed based on the ergonomic theory by the method of the improved Topsis method. Firstly, according to the operating frequency of each component in the excavator cab under different working conditions, the improved approximation ideal solution was used to prioritize each component. Secondly, in order to improve the operational convenience and work efficiency of drivers, user experience methods such as functional zoning principle and color design principle were comprehensively utilized to rearrange and design the operating components. Finally, the user interface of the redesigned layout and the original interface of current excavator were evaluated subjectively by using the 0-5 scoring table method. The results show that the user interface of the redesigned layout has higher human-computer interaction performance score than the former one. In Particular, in area division and component classification, they both have an optimization rate of about 40% and the average overall optimization rate is 35.4%. This method provides a design idea for rational planning and layout of the complex human-computer interface.

Key words: Keywords: large mining excavators, man-machine interface, the cab, improved Topsis method