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 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.

Research on the Preventive Measures of Sports Injury Based on Causality Diagram and Analytic Hierarchy Process

2013 ◽  
Vol 380-384 ◽  
pp. 1838-1842
Author(s):  
Zu Xu Zhou
Keyword(s):  
Physical Education ◽  
Analytic Hierarchy Process ◽  
Primary Schools ◽  
Sports Injury ◽  
Analysis Method ◽  
Prevention Measures ◽  
Analytic Hierarchy ◽  
Analysis Theory ◽  
Hierarchy Process ◽  
Weight Coefficients

Because of the frequent occurrence of injury accident in the sports curriculum, the security of physical education cannot be ignored. So, this paper analyzes the factors of injury accident in physical education teaching process and proposes prevention measures. The establishment of security system in physical education is an urgent problem. This paper studies the causes and countermeasures of sports injury accidents based on two methods: causality diagram and analytic hierarchy process. The first section introduces the principles of causality diagram and hierarchical analysis in detail. The second part of the article establishes mathematical model of the analysis method. The part three of the text investigates and analyzes the accident status and prevention measures of 100 primary schools and universities in Heilongjiang province in the form of literature researches and questionnaires. It also proposes weight coefficients and causality diagrams of Sports Injury Accidents using causal analysis theory. It converts causal diagram into a hierarchical model using the analytic hierarchy process AHP.

scholarly journals Accurate Load Modeling Based on Analytic Hierarchy Process

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Zhenshu Wang ◽  
Xiaohui Jiang ◽  
Shaorun Bian ◽  
Yangyang Ma ◽  
Bowen Fan
Keyword(s):  
Power System ◽  
Analytic Hierarchy Process ◽  
Load Modeling ◽  
Analytic Hierarchy ◽  
Load Model ◽  
Load Models ◽  
Power Load ◽  
Hierarchy Process ◽  
Weight Coefficients ◽  
Traction Power

Establishing an accurate load model is a critical problem in power system modeling. That has significant meaning in power system digital simulation and dynamic security analysis. The synthesis load model (SLM) considers the impact of power distribution network and compensation capacitor, while randomness of power load is more precisely described by traction power system load model (TPSLM). On the basis of these two load models, a load modeling method that combines synthesis load with traction power load is proposed in this paper. This method uses analytic hierarchy process (AHP) to interact with two load models. Weight coefficients of two models can be calculated after formulating criteria and judgment matrixes and then establishing a synthesis model by weight coefficients. The effectiveness of the proposed method was examined through simulation. The results show that accurate load modeling based on AHP can effectively improve the accuracy of load model and prove the validity of this method.

scholarly journals On the features of the implementation of the interval method for analytic hierarchy process in the problem of assessing the effectiveness of the employment service

2020 ◽  
pp. 41-48
Author(s):  
N. F. Bogachenko ◽  
D. N. Lavrov
Keyword(s):  
Analytic Hierarchy Process ◽  
Interval Arithmetic ◽  
Pairwise Comparisons ◽  
Efficiency Function ◽  
Analytic Hierarchy ◽  
Employment Service ◽  
Interval Method ◽  
The Analytic Hierarchy Process ◽  
Hierarchy Process ◽  
Weight Coefficients

To determine the weight coefficients of the efficiency function of the employment service, the analytic hierarchy process and interval arithmetic were used. This made it possible to take into account the opinions of various experts without losing the consistency of the matrices of pairwise comparisons.

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 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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