Reliability-based Robust Design Research On The Key Components Of Rice Transplanter

Quality is an key consideration in agricultural equipment market competitiveness.Since the working conditions of farm machinery and equipment complexity, poor working conditions make it particularly important to reliability requirements. In recent years, market research feedback shows that most parts of the vulnerability of farm machinery and equipment have poor reliability. It coupled with less service technicians in agriculture and longer after-sales service period, resulting a poor experience of farm machinery and equipment. The above mentioned constraint the farm machinery sales and marketing. Thus, the reliability of agricultural products play a key role that customers measure the quality of its products. It is imperative to improve the reliability of agricultural machinery products.This view that quality is been designed has been widely accepted. The traditional method of agricultural equipment is more rugged design, which ignore the design parameters of randomness and discrete, mostly following the safety factor of this idea,allowing bulky, low degree of reliability. Based on research “the National Natural Science Foundation of China”(51305152), this paper summarizes the present situation of structural reliability and select the rice transplanter machine as the research object, which extract its key component to do reliability-based robust design.The product quality characteristics and quality loss throughout the paper. First of all,Using quality function deployment and axiomatic design methods, fuzzy analysis of customer needs, converted the customer needs into technical staff design language. Using fuzzy regression theory establish key quality feature extraction parameters. Then,establish key quality characteristics(dial shaft) reliability optimization design for the design parameters of the model, using the improved particle swarm algorithm to the optimal solution. Thirdly, based on reliability optimization design, it further considered the variation affect of design parameters and noise factors. The product cost, quality loss is minimized as the objective function, reliability as constraints. Integrated physical planning and tolerance model to establish the structural reliability-based robust design model of the key components(compressive bar). The method used a two-step model of tolerance law by obtaining general optimization solution, and then guide physical planning to build preference function of objective function. It made the model more in line with engineering practice and reducing the calculation. Finally, use the niching PSO to solve reliability-based robust optimization model of compressive bar. Algorithm forcomputing time was short and had a high efficiency. The optimization results also had high precision.This paper detailed introducted the rice transplanter extraction process of key parts,and respectively to do the reliability optimization analysis of the dial shaft and reliability-based robust design of compressive bar, which verified the correctness of the proposed method and theory. It had a very good guiding role for practical application.