Abstract
Based on the random perturbation technique for reliability sensitivity design, some realistic reliability-based sensitivity issues are discussed, some of which have a structure of high nonlinear performance functions. Combining the related theories of the moment method of the reliability analysis, the matrix differential, and the Kronecker algebra, the reliability-based sensitivity method based on the perturbation method is modified if the first four moments of random variables are given. Meanwhile, a reliability-based sensitivity computation method is proposed. Some examples are used to show that using this method can effectively improve the accuracy of the reliability-based sensitivity computation and offer a reliable theoretic basis in engineering.
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Abbreviations
- X :
-
a vector of random variables
- n :
-
the dimensions of the vector X
- X d :
-
a certain part of the random parameters
- X p :
-
a random part of the random parameters
- ɛ :
-
a small parameter
- g(X):
-
the performance function
- g d (X):
-
a certain part of the performance function
- g p (X):
-
a random part of the performance function
- E(X):
-
the mean value of random variables
- var(X):
-
the variance of random variables
- C3(X):
-
the third moment of random variables
- C4(X):
-
the fourth moment of random variables
- µg :
-
the mean value of the performance function
- σ 2 g :
-
the variance of the performance function g(X)
- θ g :
-
the third central moment of the performance function g(X)
- η g :
-
the fourth central moment of the performance function g(X)
- β :
-
the reliability index
- PDF:
-
the probability density function
- Φ(·):
-
the standard normal distribution function
- φ(·):
-
the standard normal probability density function
- H i (y):
-
the Hermite polynomial
- R(β):
-
the reliability of the system
- \( \frac{{dR\left( \beta \right)}} {{d\bar X^T }} \) :
-
sensitivity of reliability with respect to the mean value of random variables
- \( \frac{{dR\left( \beta \right)}} {{d\operatorname{var} \left( X \right)}} \) :
-
sensitivity of reliability with respect to the variance of random variables
- I n :
-
the n × n unit matrix
- U n×n :
-
the permutation matrix
- Q :
-
the load effect on the tension bar
- d 0 :
-
the inside diameter of the tubular section
- d 1 :
-
the outside diameter of the tubular section
- r :
-
material strength of a tension bar
- l :
-
the length of the shaft where the dynamic stress is maximum
- E :
-
the elastic modulus of the shaft
- ω :
-
the rotational speed of the rotor system
- u :
-
the unbalance value of the rotor system
- ρ :
-
the correlation coefficient
- PRSM:
-
the reliability sensitivity computation method based on the perturbation method
- PRSMM:
-
the modified reliability sensitivity method based on the perturbation method
- CDM:
-
the central difference method
- MCS:
-
the Monte-Carlo simulation method.
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Communicated by Li-qun CHEN
Project supported by the Key National Science and Technology Special Project on “Hign-Grade CNC Machine Tools and Basic Manufacturing Equipments” (No. 2010ZX04014-014), the National Natural Science Foundation of China (No. 50875039), and the Program for Changjiang Scholars and Innovative Research Team in University
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Zhang, Ym., Zhu, Ls. & Wang, Xg. Advanced method to estimate reliability-based sensitivity of mechanical components with strongly nonlinear performance function. Appl. Math. Mech.-Engl. Ed. 31, 1325–1336 (2010). https://doi.org/10.1007/s10483-010-1365-x
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DOI: https://doi.org/10.1007/s10483-010-1365-x