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A reliability allocation method for NC machine tools based on maximum entropy ordered weighted average

A CNC machine tool, weighted average technology, applied in data processing applications, instruments, resources, etc., to reduce machine tool maintenance costs, improve reliability, and control reasonable support costs.

Inactive Publication Date: 2018-12-25
BEIJING UNIV OF TECH
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Problems solved by technology

[0005] Aiming at the deficiencies of existing machine tool reliability distribution methods, the present invention proposes a numerically controlled machine tool reliability distribution method based on the maximum entropy ordered weighted average, which effectively solves the problems of factors I, S, P, and E in traditional target feasibility technologies. The Equal Weight Problem of Measurement Scale

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  • A reliability allocation method for NC machine tools based on maximum entropy ordered weighted average
  • A reliability allocation method for NC machine tools based on maximum entropy ordered weighted average
  • A reliability allocation method for NC machine tools based on maximum entropy ordered weighted average

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Embodiment Construction

[0028] The present invention takes a numerical control machine tool as an example to verify whether the invention can achieve optimal distribution.

[0029] Specifically include the following steps:

[0030] Step 1: List the structure of the CNC machine tool system and its subsystems, such as figure 1 shown

[0031] Step 2: Based on the design requirements and system operating environment, the system reliability of the CNC machine tool system is set to 0.995214, and the task time is set to 1000 hours. The failure rate of the CNC machine tool system can be calculated by formula (1), namely

[0032] lambda S =-ln(R) / T=0.0000047975=47.975×10 -7

[0033] Step 3: Determine the scales of I, S, P, and E for each subsystem of the CNC machine tool (ISPE value is a number within 1 to 10), and then use the method of expert judgment to determine the ISPE of each subsystem of the CNC machine tool value, as shown in Table 2

[0034] Table 2: ISPE values ​​of CNC machine tool subsystem...

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Abstract

The invention discloses a reliability distribution method of a numerical control machine tool based on a maximum entropy ordered weighted average, belonging to the design field of a high-grade numerical control machine tool and basic manufacturing equipment, in particular to a reliability distribution method of the numerical control machine tool. Based on the target feasibility technology, the polynomial equation is derived from the ordered weighted average operator to determine the optimal weighted vector under the maximum entropy, and the correct evaluation is made on the comprehensive influence degree of complexity, technical level, working time and environment on the machine tool subsystems, so as to make a correct judgment on the reliability allocation level of the machine tool subsystems. This method fundamentally solves the shortcomings of the target feasibility technology and the uneven distribution of the measurement scale of the average weight distribution method.

Description

technical field [0001] The invention relates to the design field of high-grade numerical control machine tools and basic manufacturing equipment, in particular to a reliability distribution method of numerical control machine tools Background technique [0002] Reliability assignment is one of the most important factors to consider when determining product reliability and competitiveness, and is an important analytical tool that can be used to improve system reliability. In recent years, due to the increased complexity of engineered systems used in high-tech industrial processes, concerns about system reliability have increased [0003] Reliability allocation is the work carried out in order to allocate the reliability index of the system to each component unit of the system according to certain criteria. Its purpose is to convert the reliability index of the whole system into the reliability index of each subsystem or unit to make them consistent. It is a decomposition pr...

Claims

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Application Information

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IPC IPC(8): G06Q10/06
CPCG06Q10/06312
Inventor 程强王昊张彩霞孙东洋杨聪彬刘志峰
Owner BEIJING UNIV OF TECH
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