Research On The Evaluation Method Of Modern Agricultural Equipment Ergonomics Design

After decades of rapid development of Chinese agricultural equipment industry,the type,quantity and total power have made great progress,and main crop's production processes have been basically realizing mechanization While compared with agricultural developed countries,Chinese agricultural equipment still lag significantly behind in overall technology level,security,reliability and humanized.The traditional ergonomic evaluation methods of agricultural equipment focused on studies of the ergonomic evaluation index system,weight and synthetic model which were based on the analysis of specific product's man-machine system.They neglected the effects of different developing and design strategies in each product life cycle stages upon agricultural equipment ergonomic design and evaluation,and the continuity and evolution of ergonomic evaluation activities in product life cycle.The research hypothesis that ergonomic evaluation of agricultural equipment should be based on the theory of product lifecycle was put forward for that it may promote agricultural equipment production enterprises to view the ergonormic evaluation activities in more dynamic and growing perspective,and plan each lifecycle stage's ergonomic design strategies more effectively.The study of each lifecycle stage's ergonomic evaluation,and the establishment of a more rapid,accurate and suitable ergonomic evaluation expert system for early design,can not only improve the application level of ergonomic knowledge and methods in agricultural equipment,evaluate the cost-benefit of ergonomic design and the matching degree of man-machine,but also provide some directions and strategies to optimize the product design by the evaluation results obtained from the expert systemBased on the above,the study tries to explore problems arising in agricultural equipment ergonomic evaluation and application process which was based on the theory of product lifecycle.The research content is as follows:1.The matching level and influence factors of man-machine in agricultural equipment.By analyzing the conmmon theory models of user satisfaction,a human-machine matching and satisfaction model was put forward,and then the research of human-machine matching level was carried out by user satisfaction evaluation method.A survey questionnaire with attitude towards system function,specific human-machine interfaces,self-perception work state of operators,anticipations of future design in 5 points Likert scale was given out to 100 agricultural equipment operators.After analyzing the 74 valid questionnaires in descriptive and correlation analysis,characteristics of the operators and attitudes towards different aspects of ergonomic design for agricultural equipment and the influence fectors were collected.2.The ergonomic evaluation index system and their structural relationships for each lifecycle stage agricultural equipment.In order to ensure that the ergonomic evaluation index system in each lifecycle stage was of diversity,growth,particularity,a new index system with strong representative indicators collected from some experts who worked in agricultural equipment design and manufacture,and optional indicators added for specific strategy reasons was put forward.At first.an initial ergonomic evaluation index system was set up after reviewing the related literatures,some rounds brainstorm discussions.To collect the strong representative indicators and optimize the index system structures in introduce,developing and maturity lifecycle stages,2 rounds feedback Delphi consults with15 experts in 3 areas were consulted,and the attitude means,coefficient of variation and standard deviation were used to decide which indicator was highly recommended by the experts panel3.The same measurement processing method of different evaluation indicators.After analyzing the aim of lifecycle ergonomic evaluation,characteristics of each evaluation indicator and common same-measurement processing methods,a method that the quantity indicators should be processed with the corresponding curve function obtained in Matlab.The qualitative indicators should be processed by direct scoring method with hundred mark system from subjective evaluation participators.4.The indicator weights and synthesis model of each lifecycle stage.After analyzing the advantages and disadvantages of the main methods to establish indicator weights,a new method with AHP and entropy weight method was put forward to establish weights of the bottom level indicators.In this way,the subjective value judgment weights of expert panel,the reliability weights of each expert and the information weights of evaluation data were synthesized.The weights of other level indicators were obtained from the subjective evaluation participators by using 1?9 scale weight construction method.According to the evaluation aim and lifecycle stage of the product,suitable evaluation index system and weights were selected,and then,all the evaluation results of each indicator were synthesized by additive synthesis model.5.The development and testing of the ergonomic evaluation expert system.According to the lifecycle ergonomic evaluation theory and methodology proposed above,the key technologies of Web serviced expert system were analyzed.After that the main function and user requirements,the establishment of the knowledge base and database,the design of reasoning machine and human-computer interface,all keys of the lifecycle ergonomic evaluation expert system were analyzed and designed,and the expert system were developed in Dreamweaver.Finally the expert system was tested with pedal element of one domestic tractor design to verify the validity of the method proposed in this paper and test the availability and feasibility of the expert system developed with the above method and theory.