Time-variant reliability sensitivity analysis method and device

A technique for sensitivity analysis and reliability, used in special data processing applications, instruments, electrical digital data processing, etc.

Active Publication Date: 2017-05-31
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a time-varying reliability sensitivity analysis method and device to solve the technical problem that

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  • Time-variant reliability sensitivity analysis method and device
  • Time-variant reliability sensitivity analysis method and device
  • Time-variant reliability sensitivity analysis method and device

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Embodiment 1

[0066] figure 1 It is a schematic flow chart of the time-varying reliability sensitivity analysis method provided according to Embodiment 1, such as figure 1 As shown, this embodiment provides a time-varying reliability sensitivity analysis method, which is based on a long-period degraded motion mechanism, including:

[0067] Step 101, perform n-order PCE calculation on the motion mechanism to obtain the n-th-order MRF and n-th-order PCE function formula of the motion mechanism, where n is a positive integer greater than 1.

[0068] Specifically, n-order chaotic polynomial expansions (Polynomial chao expansions, referred to as PCE) operations are performed on the motion mechanism to obtain the maximum resistance force of the n-th order resistance of the motion mechanism (Maximum resistance force, referred to as MRF) and the n-th order PCE function formula, the n-th order The first-order PCE function is a relationship between the dependent variable and the independent variable...

Embodiment 2

[0078] This embodiment is a supplementary description based on the first embodiment.

[0079] figure 2 It is a schematic flow chart of the time-varying reliability sensitivity analysis method provided according to Embodiment 2, such as figure 2 As shown, this embodiment provides a time-varying reliability sensitivity analysis method, which is based on a long-period degraded motion mechanism, including:

[0080] Step 201, obtaining degenerate design parameters, wherein the degenerate design parameters are design parameters with a wear-out failure mechanism in the motion mechanism and whose nominal values ​​change with time;

[0081] Specifically, step 201 specifically includes:

[0082] Obtain the failure mode and failure mechanism with the highest risk level of the motion mechanism; establish a failure model according to the failure mode and failure mechanism; calculate and obtain degenerated design parameters according to the failure model.

[0083] Specifically, it is f...

Embodiment 3

[0150] The time-varying reliability sensitivity analysis device provided in this embodiment is used to implement the time-varying reliability sensitivity analysis method in the first embodiment above.

[0151] Figure 6 It is a schematic structural diagram of a time-varying reliability sensitivity analysis device according to Embodiment 3 of the present invention, as Figure 6 As shown, this embodiment provides a time-varying reliability sensitivity analysis device, including: a first acquisition module 301 , a second acquisition module 302 , a judgment module 303 and a third acquisition module 304 .

[0152] Among them, the first acquisition module 301 is used to perform n-order chaotic polynomial expansion PCE operation on the motion mechanism, and obtain the maximum value MRF of the resistance of the n-th order of the motion mechanism and the n-th order PCE functional formula, wherein n is a positive value greater than 1 integer.

[0153] The second acquiring module 302 i...

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Abstract

The invention provides a time-variant reliability sensitivity analysis method and device. The method comprises the following steps: step 101, n-order PCE (Polynomial chaos expansions) operation is performed on a motion mechanism, and the MRF (maximum resistance force) of the nth order of the motion mechanism and an nth-order PCE functional expression are obtained, wherein n is a positive integer larger than 1; step 102, estimated MRF obtained on the basis of simulation model estimation is acquired; step 103, whether the absolute value of the difference between the nth-order MRF and the estimated MRF is smaller than a preset threshold is judged; step 104, when the absolute value of the difference between the nth-order MRF and the estimated MRF is smaller than the preset threshold, a time-variant limit state function is constructed according to the nth-order PCE functional expression, time-variant reliability sensitivity of the motion mechanism is obtained, so that time-variant reliability sensitivity analysis based on the long-period degeneration motion mechanism is realized, and support is provided for reliability-based design optimization of the long-period degeneration motion mechanism.

Description

technical field [0001] The invention relates to the field of reliability analysis of motion mechanisms, in particular to a time-varying reliability sensitivity analysis method and device. Background technique [0002] The reliability of the motion mechanism is defined as the ability of the mechanism to complete the specified function within the specified time and under the specified conditions. In engineering design, in order to maximize the output performance of the motion mechanism on the premise of ensuring the reliability of the mechanism, it is usually necessary to adopt reliability-based design optimization (RBDO). However, its computational workload has a great relationship with the number of input variables. Reliability sensitivity analysis aims to quantify the degree of influence of uncertainty parameters on model reliability, which can help designers answer the following questions: (1) which uncertainty parameter has the greatest impact on reliability, (2) which u...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/17
Inventor 杜绍华陈旭鸿潘宇雄汪旭袁莹莹
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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