Reliability Optimization Allocation Method for Multifunction Systems Based on Goal Oriented Methodology

2016 ◽  
Author(s):  
Xiaojian Yi ◽  
B. S. Dhillon ◽  
Jian Shi ◽  
Hui-na Mu ◽  
Peng Hou
Keyword(s):  
System Reliability ◽  
Reliability Index ◽  
Mathematic Model ◽  
Allocation Problem ◽  
Reliability Optimization ◽  
Constraint Function ◽  
System Cost ◽  
Allocation Method ◽  
Reliability Constraint ◽  
Optimization Allocation

This paper proposes a new reliability optimization allocation for multifunction systems based on GO methodology. First, two constraints functions are proposed, which are unit reliability constraint function and system reliability constraint function, respectively. The unit reliability constraint function consists of allocated reliability index of unit and the range of reliability index for unit. And the system reliability constraint function consists of the target reliability index of system, and the predicted reliability index of system obtained by using GO method and allocated reliability index of unit. Then, the objective function of optimization allocation problem is established to describe the system cost minimization taking into consideration costs of unit redesigned and unit selected versions. Based on above, the mathematic model of reliability optimization allocation problem for complex multifunction systems is established. In addition, an improved genetic algorithm is presented to solve this mathematic model. Furthermore, the process of the new reliability optimization allocation method for complex multifunction systems is formulated. Finally, the new method is applied in reliability optimization allocation of Power-shift Steering Transmission whose goal is to minimize the system cost. The results analysis shows that the system costs for different operation times turn to a relatively stable value, and the allocated reliability indexes of unit are satisfied with engineering requirements. All in all, this new optimization allocation method can not only obtain the reasonable allocation results quickly and effectively, but it also can overcome the disadvantages of existing reliability optimization allocation methods for complex multifunction systems efficiently. In addition, the analysis process shows that the reliability optimization allocation method based on GO method can provide a new approach for the reliability optimization allocation of multifunction systems.

A New Reliability Optimization Allocation Method for Nuclear Power Systems Based on Goal Oriented Methodology

2017 ◽  
Author(s):  
Yi Xiao-jian ◽  
Xie Yong-cheng ◽  
Shi Jian ◽  
Mu Hui-na ◽  
Hou Peng
Keyword(s):  
Power Systems ◽  
System Reliability ◽  
Nuclear Power ◽  
System Analysis ◽  
Mathematic Model ◽  
Reliability Optimization ◽  
New Approach ◽  
Allocation Method ◽  
Go Model ◽  
Optimization Allocation

This paper presents a new reliability optimization allocation method for complex nuclear power systems based on Goal Oriented (GO) method, whose goal is to minimize the system cost. First, the new reliability optimization allocation method is expounded in detail. And its process is formulated. Then, the hoisting mechanism in nuclear power plant is taken as an example to allocate its system reliability index to design unit by the new method. The reliability optimization allocation processes are mainly as follows: (i) Conducting system analysis, (ii) Developing GO model, (iii) Establishing reliability optimization allocation mathematic model, (iv) Solving the reliability optimization allocation mathematic model, (v) Determining the allocation results. The results analysis shows that the system costs for different solving times turn to a relatively stable value, and the allocated reliability indexes of unit are satisfied with engineering requirements. All in all, this new reliability optimization allocation method can not only obtain the reasonable allocation results quickly and effectively, but it also can overcome the disadvantages of existing reliability optimization allocation methods for complex nuclear power systems efficiently. Moreover, this paper provides a new approach for the reliability optimization allocation of complex nuclear power systems.

A New Composite Allocation Method on Balance of Reliability and Maintainability Index With the Goal of Availability

2016 ◽  
Author(s):  
Hui-na Mu ◽  
Li Cheng ◽  
Xiaojian Yi ◽  
B. S. Dhillon ◽  
Peng Hou
Keyword(s):  
Reliability Index ◽  
Fuzzy Ahp ◽  
Local Optimum ◽  
Repairable Systems ◽  
System Availability ◽  
System Cost ◽  
Data Correction ◽  
Allocation Method ◽  
System Data ◽  
Optimization Allocation

This paper proposes a new composite allocation method, which is composed by improved Fuzzy-AHP allocation method, old system data correction allocation method, and optimization allocation method. The objective of the new method is to minimize the system cost and allocate the reliability index and maintenance index of unit with the goal of system availability and the balance between them. For the solution of optimization problem in this paper, in order to prevent local optimum, improve the convergence efficiency and get the satisfied optimal solution, the improved GA method is put forward in this paper. First, the reliability index allocation method is proposed by the combination of optimization allocation method with the objective of minimum cost, the improved Fuzzy-AHP method with the consideration of the experts’ expectations, and the old system data correction allocation method. Then, based on constraints of the unit reliability allocation index and system availability index, the maintain-ability allocation method is proposed considering the minimum maintenance cost. In addition, the process of this new composite allocation method is formulated in this paper. Finally, the system cost, reliability index, and maintenance index of an integrated transmission device of an armored vehicle are allocated by this new composite allocation method. The result analysis shows that the allocation result of this new composite allocation method is reasonable and has engineering applicability. All in all, this new composite allocation method not only synthetically considers experts’ expectations on the new system, system cost and system reliability baseline information, but also associate the reliability index and maintenance index with the goal of system availability. In addition, this paper provides a new approach for reliability index & maintenance index of complex repairable systems in the early stages of product design.

Reliability Optimization Allocation Method for Multifunction Systems With Multistate Units Based on Goal-Oriented Methodology

2017 ◽  
Vol 3 (4) ◽  
Author(s):  
Xiao-jian Yi ◽  
B. S. Dhillon ◽  
Jian Shi ◽  
Hai-na Mu ◽  
Peng Hou
Keyword(s):  
Reliability Optimization ◽  
Allocation Model ◽  
New Approach ◽  
Reliability Indices ◽  
Analysis Process ◽  
Allocation Method ◽  
Power Shift ◽  
Go Model ◽  
Go Methodology ◽  
Optimization Allocation

This paper proposes a new reliability optimization allocation for multifunction systems with multistate units based on goal-oriented (GO) methodology. First, this optimization allocation method is expounded in terms of establishing GO model, establishing reliability optimization allocation model, and solving algorithm. Then its process is formulated. Finally, the new method is applied in reliability optimization allocation of power-shift steering transmission (PSST), whose goal is to minimize the system cost. The results analysis shows that the system costs for different operation times turn to a relatively stable value, and the allocated reliability indices of unit are satisfied with engineering requirements. All in all, this new optimization allocation method can not only obtain the reasonable allocation results quickly and effectively, but it also can overcome the disadvantages of existing reliability optimization allocation methods for complex multifunction systems efficiently. In addition, the analysis process shows that the reliability optimization allocation method based on GO method can provide a new approach for the reliability optimization allocation of multifunction systems with multistate units.

A Reliability Optimization Allocation Method Considering Differentiation of Functions

2016 ◽  
Vol 13 (04) ◽  
pp. 1641020 ◽  
Author(s):  
X. J. Yi ◽  
Y. H. Lai ◽  
H. P. Dong ◽  
P. Hou
Keyword(s):  
Genetic Algorithm ◽  
Optimal Solution ◽  
Reliability Function ◽  
New Method ◽  
Reliability Optimization ◽  
Main Function ◽  
Actual Situation ◽  
Allocation Method ◽  
Importance Factor ◽  
Optimization Allocation

The reliability optimization has achieved great concern in recent years. Nowadays, many researchers obtain allocation results which can maximize the system reliability subject to the system budget. In these researches, the effect of system’s functions is always neglected or only considering the single main function of system. In addition, there are also no obvious evidences in results to distinguish the importance level of different units. However, complex systems tend to perform multiple functions. What’s more, the use frequency of each function and the combinations of units to realize different functions are not the same. In addition, the use demand of different functions is decided by different task environments, the demand differentiation of functions has led to the usage of frequency of various functions having different levels about reliability. Therefore, the reliability optimization allocation only considering cost constraint conditions is not accurate and will results in disaccord between the obtained results with actual situation. Focusing on the problem mentioned above, a reliability optimization allocation method that considers cost constraint and importance factor is proposed. In this paper, we consider systems consisting of units characterized by different reliability and importance factors. Such systems are multi-function because they must perform different tasks depending on the combination of units. Different functions may work simultaneously. Firstly, the concept of importance factor is defined to describe the importance of a unit and the required importance factor level of system functions in the task is also given. To deal with the differentiation of system functions, the corresponding bound about importance factor are executed when looking for the optimal solution. Similarly, the cost constraint is also forced. Finally, in order to reduce the randomness of intelligent algorithm, a number of optimization are conducted and a rule is proposed to select the most optimal solution from all the optimal solutions which are obtained in every iterative loop. Example of an integrated transmission device is presented. To begin with, we establish the reliability function of system as the objective optimization function. Then, the restraint of budget and different demands of importance factor of system functions are posed. Furthermore, using a genetic algorithm as the optimization tool, the optimization result can be obtained. Finally, the most optimal solution is selected. The results show that, the method, we proposed is more correct and more approximate than the reality. To verify the advantages and engineering applicability of the new method, the results obtained by the new method are compared with the results obtained under different conditions using basic genetic algorithm, without considering functions and the differentiation of functions, to solve the allocation problem of integrated transmission device, respectively. The reliability optimization allocation method presented in this paper can not only consider the constraint of cost but also can consider the diversities of functions, and thus the optimization results will be more approximate in actual situation. At the same time, this paper can also provide guidance for the similar reliability optimization problem.

A Reliability Optimization Allocation Method for Multifunction System With Differentiation of Functions

2015 ◽  
Author(s):  
Xiaojian Yi ◽  
Peng Hou ◽  
Haiping Dong ◽  
Yuehua Lai ◽  
Huina Mu
Keyword(s):  
Genetic Algorithm ◽  
Generating Function ◽  
System Reliability ◽  
Reliability Optimization ◽  
Main Function ◽  
System Function ◽  
Improved Genetic Algorithm ◽  
Reliability Allocation ◽  
Power Shift ◽  
Optimization Allocation

The study on the optimization of system reliability allocation rarely involved the constraints on different functions of system. Some constraints only referred to the main function or one function in system. Owing to the requirement of mission and other factors, all system functions need to have different performance and reliability respectively. For this reason, we proposed a new method for optimization of reliability allocation in this paper. The constrains in the method focus on the discrepancy of reliability of different functions of system. The reliability of system function is defined as it whether to meet the requirement of mission capacity, and the reliability of all different system functions will be calculated by universal generating function, and the objective is to minimize system cost. At last, this method is applied in reliability optimization allocation of a Power-shift Steering Transmission with the improved genetic algorithm.

Sign in / Sign up

Export Citation Format

Share Document