Research On Optimal Design Of Tractor Hood

Tractors are the main power machinery in agricultural production.In the context of various national policies supporting agriculture and benefiting agriculture to encourage the development of China's agriculture and rural areas,the tractor market is also evolving with the growth of consumer demand.There are many tractor brands at home and abroad.In order to improve the competitiveness of domestic agricultural machinery brands in the market,the design and development of tractors not only requires technical breakthroughs,but also meets the needs of consumers in styling design.As the main component of the overall shape of the tractor,the hood of the tractor affects the overall style of the tractor.Dig deeply into the consumer's perceptual perception of the hood shape of the tractor,and analyze the correspondence between the morphological elements of the hood of the tractor and the perceptual image,so that the new products designed can meet the perceptual needs of consumers.Since the product form has a holistic principle,the image evaluation obtained by separating a component part alone cannot represent its image feeling in the overall form.Therefore,in this study,the hood of the tractor was guided by the theoretical method of perceptual engineering As a variable,the rest of the parts except the hood are processed quantitatively to form an experimental sample to complete the sensory cognitive measurement of consumers;mathematical statistical analysis method is used to analyze the correlation between the consumer's perceptual image and the morphological elements of the tractor hood,and to This is the reference to complete the optimization design scheme of the tractor hood based on consumer emotional image.The main research work and results of this article are:(1)Focus group,KJ method,multiple regression analysis and cluster analysis are used to screen and dimensionality reduce the collected samples,select 10 wheeled tractor samples to construct representative Sample space.(2)The semantic difference method,factor analysis and cluster analysis are used to analyze the collected perceptual images and survey data,and 7 pairs of perceptual image vocabulary form a space representing sexy images.(3)Design a free-form eye-movement experiment to verify that the hood is the most important part of the subject when observing the wheeled tractor.(4)Designed a taskbased eye movement experiment,and conducted a spoken language evaluation experiment at the same time,understanding the subjects' eye movement changes and perceptual cognition of the specific modeling elements of the hood.(5)The eye movement data and hood shape elements of the subjects in each group of perceptual image recognition tasks are used as the input layer,and the corresponding perceptual image evaluation value is used as the output layer to complete the BP neural network of the tractor hood shape design User evaluation and prediction model training and construction;at the same time,multiple regression analysis is used to obtain the specific correspondence between tractor hood modeling elements and perceptual images.(6)Based on the results of the correlation study,the modeling optimization design of the tractor hood corresponding to 7 sets of perceptual images was completed,and the comparative analysis of the actual perceptual prediction values and evaluation values was carried out to verify the reliability of the BP neural network model obtained in this study.According to the morphological design elements obtained by multiple regression analysis,the corresponding perceptual image optimization design scheme can be formed,which provides a new idea for the optimization design research of the tractor hood.