scholarly journals Optimization design of powertrain mounting system considering vibration analysis of multi-excitation

2018 ◽  
Vol 10 (9) ◽  
pp. 168781401878824 ◽  
Author(s):  
Xiangyang Xu ◽  
Chengyun Su ◽  
Peng Dong ◽  
Yanfang Liu ◽  
Shuhan Wang
Keyword(s):  
Energy Method ◽  
Vibration Analysis ◽  
Optimization Design ◽  
Vibration Isolation ◽  
Design Method ◽  
Robustness Analysis ◽  
Integrated Design ◽  
Front Wheel ◽  
Rigid Body Dynamics ◽  
Response Characteristics

The stiffness of mounting system determines the vibration isolation ability of the transmitted path, which is the key factor that affects the vibration and noise of vehicle. In order to improve the vibration isolation ability of the powertrain mounting system, considering the powertrain of front wheel drive car as the research object, the vibration decoupling rate and its corresponding frequency of the powertrain mounting system are analyzed by rigid body dynamics and energy method. The correctness of the calculation program with energy method has been verified by calculated vibration decoupling rate. Based on the genetic algorithm and the fusion robustness analysis, the decoupling rate and modal frequency of the mountings in all directions are considered as the objectives; the stiffness of the three mountings is optimally designed. Through multi-excitation of three methods and vehicle test, the vibration response characteristics and the vibration noise test data of the optimization stiffness are compared and the results shown that the vibration isolation performance has been significantly improved more than 10%. An integrated design method of stiffness optimization design and vibration analysis in vehicle PMS is formed, which has theoretical and practical value, and can reduce vehicle vibration and noise.

Equipment Development of Crankshaft Barrel Finishing on Integrated Design Theory

2012 ◽  
Vol 522 ◽  
pp. 264-267 ◽  
Author(s):  
Wen Hui Li ◽  
Sheng Qiang Yang ◽  
Xiu Hong Li
Keyword(s):  
Design Theory ◽  
Optimization Design ◽  
Design Method ◽  
Integrated Design ◽  
Function Optimization ◽  
Equipment Development ◽  
Barrel Finishing

ntegrated design theory and method oriented to the product generalized quality is one design method facing to the full-function and whole performance. Design theory of barrel finishing equipment is put forward by the design of crankshaft barrel finishing equipment, function optimization and visual optimization design are mainly discussed, which can provide the design thought for developing new barrel finishing equipment.

The Simulation and Optimization Design of Adams-Based Engine Suspension System

2014 ◽  
Vol 686 ◽  
pp. 529-534
Author(s):  
Jian Xin Xie ◽  
Xiao Le Wang ◽  
Chao Liu
Keyword(s):  
Initial Data ◽  
Optimization Design ◽  
Vibration Isolation ◽  
Design Method ◽  
Suspension System ◽  
Multi Objective Optimization ◽  
Intrinsic Frequency ◽  
Simulation And Optimization ◽  
Engine Vibration ◽  
Simulation Results

In this study, the engine suspension system was optimized for making the vibration between engine and car body minimized, and also the optimization was simulated using software Adams. The purpose of this study was to research the vibration isolation of the engine mounting system and implement multi-objective optimization for the intrinsic frequency. In this paper, the optimization was implemented in two ways: (1) the intrinsic frequency was optimized by reasonably allocating it: (2) the intrinsic frequency was optimized using energy decoupling. The optimized intrinsic frequencies were simulated using software Adams and then the simulation results were compared. The simulation results showed that the optimized energy distribution was almost up to 90% and the decoupling degree was greatly improved by comparing the initial data, proving the optimized data played a greater effect on engine vibration isolation and further verifying the feasibility of optimization design method.

APDL Based Vibration Optimization of a Ship Foundation

2011 ◽  
Vol 338 ◽  
pp. 525-529
Author(s):  
Fu Zhen Pang ◽  
Ye Qing Jin ◽  
Xiong Liang Yao
Keyword(s):  
Optimization Design ◽  
Vibration Isolation ◽  
Design Method ◽  
Optimization Theory ◽  
Foundation Design ◽  
Structural Dynamic ◽  
Optimization Study ◽  
Practical Engineering ◽  
Vibration Isolation Performance ◽  
Isolation Performance

Based on the structural dynamics optimization theory, a vibration optimization design method of a ship foundation by APDL language is presented in this paper. Structural dynamic optimization design of a ship foundation under the constraint of gross weight of a ship cabin is performed by ANSYS to minimize the vibration of ship hull plating. Optimization shows that the thickness of webs has considerable influence on the vibration isolation performance of ship foundation, while changes of the thickness of base panels and brackets have insignificant influence. Optimal thickness combination of webs, panels and brackets of the foundation is obtained through the optimization. Study also provides reference for practical engineering as well as enriches theories and methodologies of novel vibration isolation for ship foundation design.

Optimization Design of Vibration and Shock Isolation System

2006 ◽  
Author(s):  
Cun-Sheng Zhao ◽  
Shi-Jian Zhu ◽  
Zhen-Zhong Zhang
Keyword(s):  
Optimal Design ◽  
Optimization Design ◽  
Vibration Isolation ◽  
Design Method ◽  
Engineering Application ◽  
Experimental Results ◽  
Isolation System ◽  
Combination Optimization ◽  
Shock Resistance ◽  
Shock Isolation

The combination optimization design problem of vibration isolation and shock resistance system is studied in consideration of acoustical concealment performance and lifeforce of ships. The weakness of design method based on continuity is pointed out and combination optimal design method is brought forward. Then the limiting performance of shock isolation system is analyzed and two realization methods are discussed. One method is to adopt linear stiffness component with large damping. The other method is to use multiple linear stiffness components without damping. Amplitude of steady excitation is much smaller than that of shock input during experiment. Experimental results showed that the optimal loss factor is still 0.4 when the stiffness of shock bumper is much larger than that of vibration isolator, just the same with that suffered from only shock loads. Experimental results also showed that limiting performance can be achieved by configuration optimal design using multiple linear components. The two discussed methods can be used to direct engineering application.

scholarly journals An Integrated Design Approach for LCL-Type Inverter to Improve Its Adaptation in Weak Grid

Energies ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2637
Author(s):  
Zheng ◽  
Liu ◽  
Liu ◽  
Li ◽  
Dai ◽  
...  
Keyword(s):  
Design Method ◽  
Robustness Analysis ◽  
Integrated Design ◽  
System Stability ◽  
Lcl Filter ◽  
Weak Grid ◽  
Grid Impedance ◽  
Integrated Design Approach ◽  
Simulation And Experiment ◽  
Grid Connected Inverter

To improve the robustness of grid-connected inverter against grid impedance in a weak grid an integrated design method of LCL-filter parameters and controller parameters is proposed. In the method the inherent relation of LCL-filter parameters and controller parameters is taken into consideration to realize their optimized match. A parameter normalization scheme is also developed to facilitate the system stability and robustness analysis. Based on the method all normalization parameters can be designed succinctly according to the required stability and robustness. Additionally, the LCL parameter and controller parameter can be achieved immediately by restoring normalization parameters. The proposed design method can guarantee the inverter stability and robustness simultaneously without needing any compensation network, additional hardware, or the complicated iterative computations which cannot be avoided for the conventional inverter design method. Simulation and experiment results have validated the superiority of the proposed inverter design method.

Combination Optimization Design Method of Vibration Isolation and Shock Resistance System

2006 ◽  
Vol 324-325 ◽  
pp. 783-786
Author(s):  
Cun Sheng Zhao ◽  
Shi Jian Zhu
Keyword(s):  
Optimal Design ◽  
Optimization Design ◽  
Vibration Isolation ◽  
Design Method ◽  
Engineering Application ◽  
Isolation System ◽  
Combination Optimization ◽  
Resistance System ◽  
Shock Resistance ◽  
Simulation Results

The optimization design problem of vibration isolation and shock resistance system is studied in consideration of acoustical concealment performance and life-force of ships. The weakness of design method based on continuity is pointed out and combination optimal design method is brought forward. Then the limiting performance of shock isolation system is analyzed and two realization methods are discussed. One method is to adopt linear stiffness component with large damping. The other method is to use multiple linear stiffness components without damping. Simulation results showed that the optimal loss factor is still 0.4 when the stiffness of shock bumper is much larger than that of vibration isolator, just the same with that suffering from only shock loads. Simulation results also showed that limiting performance can be achieved by configuration optimal design using multiple linear components. The two discussed methods can be used to direct engineering application.

Study on Optimization Design of Hybrid Vibration Isolation System on Flexible Foundation

2005 ◽  
Author(s):  
Wei-Min Mao ◽  
Shi-Jian Zhu ◽  
Hui-Ming Jiang
Keyword(s):  
Optimization Design ◽  
Power Flow ◽  
Vibration Isolation ◽  
Design Method ◽  
System Structure ◽  
Parameter Method ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Global Sensitivity ◽  
Flexible Foundation

This article analyzes the process to design hybrid vibration isolation system on flexible foundation. The dynamic model of a hybrid vibration isolation system on flexible foundation is build and the character of power flow transmission is analyzed by sub-system structure impedance synthesis technique and four poles parameter method. The global sensitivity analysis with the Sobol’ method is used to study the global sensitivity behavior of the hybrid vibration isolation system. The multi-objective optimization design method of hybrid vibration isolation system is studied and the mathematic optimization model has been built. Gene algorithm has been used to solve the global optimization problem, and the numerical simulation is carried out.

scholarly journals A Comprehensive Optimization Design Method of Aerodynamic, Acoustic, and Stealth of Helicopter Rotor Blades Based on Genetic Algorithm

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Mingxu Yi ◽  
Yalin Pan ◽  
Jun Huang ◽  
Lifeng Wang ◽  
Dawei Liu
Keyword(s):  
Genetic Algorithm ◽  
Optimization Design ◽  
Design Method ◽  
Integrated Design ◽  
Optimization Method ◽  
Rotor Blades ◽  
Helicopter Rotor ◽  
Optimization Approach ◽  
Design Variables ◽  
Helicopter Rotor Blades

In this paper, a comprehensive optimization approach is presented to analyze the aerodynamic, acoustic, and stealth characteristics of helicopter rotor blades in hover flight based on the genetic algorithm (GA). The aerodynamic characteristics are simulated by the blade element momentum theory. And the acoustics are computed by the Farassat theory. The stealth performances are calculated through the combination of physical optics (PO) and equivalent currents (MEC). Furthermore, an advanced geometry representation algorithm which applies the class function/shape function transformation (CST) is introduced to generate the airfoil coordinates. This method is utilized to discuss the airfoil shape in terms of server design variables. The aerodynamic, acoustic, and stealth integrated design aims to achieve the minimum radar cross section (RCS) under the constraint of aerodynamic and acoustic requirement through the adjustment of airfoil shape design variables. Two types of rotor are used to illustrate the optimization method. The results obtained in this work show that the proposed technique is effective and acceptable.

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