| Reliability is a comprehensive indicator reflects the overall quality of industrial robots and an important factor in determining the market competitiveness of industrial robots.Reliability allocation,as one of the reliability analysis methods,plays a vital role in the product design or development phase.This paper summarizes the working characteristics and structural composition of industrial robots through research and literature on industrial robots,and lays a foundation for studying the reliability of industrial robots.Combined with the reliability analysis method,the basic reliability allocation of industrial robots and the optimization reliability allocation of cost factors are considered,which provides a reliability allocation scheme for enterprises to improve the reliability of industrial robots.The main research results are:(1)The FMECA method in reliability analysis is applied to industrial robots to analyze all possible failure modes and causes of failure of industrial robots from the whole to the local.Then,using fault tree analysis method,the fault tree with "industrial robot fault" as the top event is established.Through qualitative analysis and quantitative calculation,the reliability of industrial robot and the probability importance of each basic bottom event are obtained.Finally,from the proportional relationship between the increase of the reliability of the basic bottom event and its probability importance,the reliability of each bottom event after the allocation is calculated.(2)In the initial stage of the design of new industrial robots,the fault data of various subsystems of industrial robots are often not available,making it difficult to carry out reliability allocation work.This paper proposes a reliability allocation method suitable for the initial design of new industrial robots.Under the premise of considering many influencing factors,the weight of each influencing factor is obtained by the advantage of AHP,and then the fuzzy comprehensive evaluation is combined to establish a fuzzy comprehensive evaluation and allocation model based on analytic hierarchy process.Finally,through the actual example,the allocation result is given.(3)Reliability allocation can be roughly divided into two categories.The first category is unconstrained reliability allocation,also known as basic reliability allocation.The second category is constrained reliability allocation,also known as reliability optimization allocation.It is a nonlinear optimization problem.This paper bases on the classical cost function and establishes the reliability assignment model of industrial robots considering cost factors.Many factors affect the total cost of industrial robots.This article lists basic costs,research and development costs,maintenance costs,and maintenance costs.Under the consideration of these cost factors,the nonlinear optimization model of industrial robots is established,and caculated the reliability of industrial robot subsystems considering cost factors though MATLAB. |
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