# The Research of Complex Product Design Process Model under the Concept of Self-Recovery
###### Abstract  
The working environment of contemporary mechanical products is becoming more complex, and the working conditions are becoming more extreme. This has led to a significant increase in the frequency of problems in mechanical products. In order to reduce the frequency of human repair after problems, the application of the self-recovery concept has become a hot research topic in the area of smart design. However, the current application of the self-recovery concept is mostly limited to the structural and parametric levels, with less research at the functional level, which may lead to a waste of resources within products. To solve this problem, this research combines the functional-level product research method with the self-recovery concept and establishes a design process model of complex products under functional self-recovery. This model extends the application scope of the self-recovery concept and improves the efficiency of resource utilization in the product. The design process model has six steps. First, according to the user requirements and the existing product, the initial function solving is carried out, and the initial function model of the product is established. Next, the main functions of the product are determined based on the initial function model of the product. Then, according to the determined main functions of the product, combined with the parameters marked in the function structure, the self-diagnosis function is designed. After that, the LT matrix and effect library are used to design the self-regulation function corresponding to the main functions, and the parameters are used to screen the self-regulation function design scheme. Finally, according to the design scheme of the self-diagnosis function and self-regulation function, the functional period oriented to self-recovery is constructed to ensure the realization of the main functions of the product. The effectiveness of the design process model is proved through the design process of an intelligent photovoltaic power generation system at the end of the paper. self-recovery concept; smart design; complex product; functional level; intelligent photovoltaic power generation system +
Footnote †: journal: Applied Sciences  
The Research of Complex Product Design Process Model under the Concept of Self-Recovery  
[PERSON], [PERSON], [PERSON], C. The Research of Complex Product Design  
and improve the design. Analyzing the product at the functional level is an effective way to reduce the design process complexity of the product and reduce the workload at the structural and parametric levels. At the same time, there are a large number of problem analysis tools at the functional level, such as function models [3], function structures [4], resource analysis [5], and conflict area analysis [6], and a large number of problem-solving tools, such as effect libraries [7], standard solutions and trimming [8]. Currently, functional-level product research methods are not well integrated with the self-recovery concept, which may lead to the wastage of functional-level resources within the product, resulting in increased difficulty in subsequent structural and parametric design. To relieve the limitations of the current research on the self-recovery concept, this paper extends the application of the self-recovery concept to the functional level, introduces the function classification criteria to the complex product design process under the self-recovery concept, and proposes the criteria for judging the self-recovery priority of product functions. In addition, effect library software is introduced into the self-regulation function design process for predicting solutions to product problems and screening solutions to product problems by marking parameters in the function structure. After extending the application of the self-recovery concept to the functional level, the resources within the product can be maximized and the ideas of complex product design under the self-recovery concept can be broadened.