scholarly journals A Fuzzy-Based Analytic Hierarchy Process for Mechanical Noise Source Identification of a Diesel Engine

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
Junhong Zhang ◽  
Qidi Zhou ◽  
Jiewei Lin ◽  
Weidong Li ◽  
Zhoujie Tang ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Analytic Hierarchy Process ◽  
Test Point ◽  
Partial Coherence ◽  
Component Level ◽  
Noise Sources ◽  
Analytic Hierarchy ◽  
Frequency Bands ◽  
Left Block ◽  
Hierarchy Process

In this paper, a novel fuzzy-based analytic hierarchy process (FAHP) is proposed for identifying noise sources of diesel engine and sorting their contributions. The hierarchy tree consists of 5 levels including the component level, the frequency band level, the test point level, the operating condition level, and the overall noise level. The variational mode decomposition (VMD) is employed to decompose the overall noise into several frequency bands. The factor weights between levels are determined by the partial coherence analysis (PCA) to consider the correlation of component vibration and radiated noise in different frequency bands. A fuzzy consistency matrix is then constructed to order the corresponding factors level by level that can avoid the consistence problem of the traditional AHP. Based on the rig test of a diesel engine, the proposed approach is implemented to weight the noise sources identified. It is shown the overall weighting order of the six major noise sources is (in descending order) the oil pan, the left block, the valve cover, the flywheel housing, and the right block.

Identification of Noise Source Based on Partial Coherence Analysis

2012 ◽  
Vol 239-240 ◽  
pp. 482-486
Author(s):  
Hai Ping Wu ◽  
Jing Jun Lou ◽  
Wen Wu Liu
Keyword(s):  
Analytic Hierarchy Process ◽  
Source Identification ◽  
Noise Source ◽  
Partial Coherence ◽  
Coherence Analysis ◽  
Noise Sources ◽  
Analytic Hierarchy ◽  
Noise Source Identification ◽  
Source Excitation ◽  
Hierarchy Process

Noise source identification is the precondition and foundation of the noise reduction. There are some limitations while using some common method to analyze noise sources, so on the basis of partial coherence analysis and analytic hierarchy process, a method was proposed which can sort noise source contribution. When noise in the multi-source excitation system is coherent，this method can identify and sort noise source.

The Application of Analytic Hierarchy Process in the Evaluation of Simulation Models of Marine Diesel Engine

2014 ◽  
Vol 525 ◽  
pp. 203-209
Author(s):  
Yuan Qing Wang ◽  
Guang Ren ◽  
Zeng Yan ◽  
Yang Hui Tan
Keyword(s):  
Diesel Engine ◽  
Analytic Hierarchy Process ◽  
Large Scale ◽  
Simulation Models ◽  
Mean Value ◽  
Marine Diesel Engine ◽  
Analytic Hierarchy ◽  
Engine Simulation ◽  
Marine Diesel ◽  
Hierarchy Process

Facing to the problem of hierarchical structure decision analysis which is made of scheme level + factor level + target level, the analytic hierarchy process gives a whole set of solution and process. This method is used to evaluate diesel engine simulation model. Evaluate original mean value model of large-scale low-speed marine diesel engine and the new one by this method. Calculated results prove this method is applicable.

scholarly journals Research on Multiobjective Topology Optimization of Diesel Engine Cylinder Block Based on Analytic Hierarchy Process

2019 ◽  
Vol 2019 ◽  
pp. 1-16 ◽  
Author(s):  
Fenghe Wu ◽  
Zhaohua Wang ◽  
Jinxu Han ◽  
Guobin Pei
Keyword(s):  
Topology Optimization ◽  
Diesel Engine ◽  
Analytic Hierarchy Process ◽  
Dynamic Characteristics ◽  
Mechanical Performance ◽  
Cylinder Block ◽  
Analytic Hierarchy ◽  
Engine Cylinder ◽  
Hierarchy Process ◽  
Weight Coefficients

There are alternating impact loads for the diesel engine cylinder block. The topology optimization of the extreme single-working condition cannot guarantee its overall mechanical performance, and the traditional multiworking condition optimization has the problem that the weight coefficients are difficult to determine. Thus, a multiobjective topology optimization method based on analytic hierarchy process is proposed. Firstly, the static, dynamic characteristics and structure efficiency are calculated by the finite element analysis which indicates the direction of topology optimization for the cylinder block. The hierarchical structure model of topology optimization, including 12 weighting coefficients, is constructed considering static multiworking condition stiffness and dynamic multiorder natural frequency. The comprehensive evaluation function for the cylinder block is established by the compromise programming method and the weight coefficients are determined based on analytic hierarchy process. The optimization mathematical model is established and the multiobjective topology optimization of the cylinder block is carried out. The optimization results show that the proposed method can take into account structural multiworking condition performance, which has obvious advantages over the single objective topology optimization. The simulation results show that the static and dynamic characteristics are improved to some extent and the overall mechanical performance of the new model is more uniform with a 5.22% reduction in weight. It shows that the topology structure of the cylinder block is more reasonable.

scholarly journals Application of analytic hierarchy Process in abnormal vibration of Marine machinery

2021 ◽  
Vol 2133 (1) ◽  
pp. 012041
Author(s):  
Junwei Zhang ◽  
Bowen Xiao ◽  
Miaomiao Cai ◽  
Jiangyu Fang ◽  
Zeguang Nie ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Analytic Hierarchy Process ◽  
Hierarchical Structure ◽  
Normal Operation ◽  
Structure Model ◽  
Analytic Hierarchy ◽  
The Hierarchical Structure ◽  
Hierarchy Process

Abstract This paper will use analytic hierarchy process to evaluate abnormal vibration of diesel engine in operation. The possible abnormal vibration factors of diesel engine in use are further analyzed to ensure the normal operation of diesel engine in use. Combined with analytic hierarchy process, the hierarchical structure model is determined, and the problems are analyzed from different angles to reduce the influence of subjective factors.

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