Development of an Engine System Model for Predicting Structural Vibration and Radiated Noise of the Running Engine

1997 ◽  
Author(s):  
Shung H. Sung ◽  
Donald J. Nefske ◽  
Francis H. K. Chen ◽  
Michael P. Fannin
Keyword(s):  
System Model ◽  
Structural Vibration ◽  
Radiated Noise ◽  
Engine System

Development of an Engine System Model for Predicting Structural Vibration

1995 ◽  
Author(s):  
S. H. Sung ◽  
D. J. Nefske
Keyword(s):  
Finite Element ◽  
Narrow Band ◽  
Vibration Response ◽  
System Model ◽  
Structural Vibration ◽  
Octave Band ◽  
Engine System ◽  
Excitation Frequencies ◽  
Engine Components ◽  
Structural Mass

Abstract A finite-element based engine system model is developed for predicting the structural vibration of the engine. The engine system model combines modal models of the major bolted-together sub-structures of the engine, with non-structural mass models of the remaining engine components added to bring the inertial properties to those of the running engine. The model is developed and experimentally evaluated with impact and shaker excitation tests. Comparisons are made of the predicted and measured vibration response for various partially assembled engine configurations, as well as for the fully assembled engine. The comparisons illustrate the accuracy of the model in predicting the narrow-band and one-third octave-band vibration response for excitation frequencies up to 2 kHz.

Radiated noise control via structural vibration control

1998 ◽  
Author(s):  
Vasundara V. Varadan ◽  
Senthil V. Gopinathan ◽  
Young-Hun Lim ◽  
Vijay K. Varadan
Keyword(s):  
Vibration Control ◽  
Noise Control ◽  
Structural Vibration ◽  
Structural Vibration Control ◽  
Radiated Noise

Simulation Research of Engine’s Electronic Control System Based on Modular Modeling Method

2014 ◽  
Vol 1078 ◽  
pp. 235-238
Author(s):  
Jian Min Sun ◽  
Ling Hua Gao ◽  
Yun Yang
Keyword(s):  
Control System ◽  
Supply System ◽  
Modeling Method ◽  
System Model ◽  
Electronic Control ◽  
Modular Modeling ◽  
Average Value ◽  
Engine Control System ◽  
Electronic Control System ◽  
Engine System

Abstract. Modular modeling method was adopted to build model for the engine’s electronic control system , including the engine system model, sensor model, controller model and actuator models. For the engine system, the modeling approach of the average value was used to establish an air supply system model, the fuel supply system model and the engine power take-off model. By the method of mathematical fit, a mathematical model of electronic control engine’s sensors was established. Based on Mat-lab/Simulink, it designed simulation system and proceeded simulation tests for each model of engine control system, then the results show that the model is correct, and it can manifest the changes of relevant parameters during the actual operational process of the engine.

A Structural-Acoustic Vehicle System Model for Noise and Vibration Analysis

2003 ◽  
Author(s):  
Shung H. Sung ◽  
Donald J. Nefske ◽  
Douglas A. Feldmaier ◽  
Spencer J. Doggett
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Exhaust System ◽  
Element Model ◽  
Interior Noise ◽  
System Model ◽  
Structural Vibration ◽  
Vehicle Interior ◽  
Front Suspension ◽  
Vehicle System

A structural-acoustic finite-element model of a sedan-type automotive vehicle is developed and experimentally evaluated for predicting vehicle interior noise and structural vibration. The vehicle system model is developed from finite-element models of the major structural subsystems, which include the trimmed body, front suspension, rear suspension, powertrain and exhaust system. An acoustic finite-element model of the passenger compartment cavity is coupled with the vehicle system model to predict the interior noise response. The predicted interior noise and structural vibration by the vehicle system model are compared with the measured responses for shaker excitation at the axle to 200 Hz. The comparisons demonstrate the accuracy of the structural-acoustic vehicle system model, and they indicate where modeling improvements are required.

scholarly journals Optimization of the Housing Shape Design for Radiated Noise Reduction of an Agricultural Electric Vehicle Gearbox

2020 ◽  
Vol 10 (23) ◽  
pp. 8414
Author(s):  
Gwan-Hee Son ◽  
Beom-Soo Kim ◽  
Seung-Je Cho ◽  
Young-Jun Park
Keyword(s):  
Noise Reduction ◽  
Electric Vehicle ◽  
Computing Time ◽  
Optimization Technique ◽  
Operating Conditions ◽  
Structural Vibration ◽  
Shape Design ◽  
Fe Model ◽  
Radiated Noise ◽  
Noise Characteristics

As the demand for agricultural electric vehicles increases, it is becoming important to conduct noise reduction in consideration of the characteristics of an electric powertrain. This study was conducted to optimize the shape design of gearbox housing for radiated noise reduction of an agricultural electric vehicle gearbox. The noise and vibration of the gearbox were measured considering the noise characteristics of the electric vehicle gearbox, which radiates high-frequency pure tone noise. The main noise source radiated by the structural vibration of the gearbox housing was identified and considered when modeling the loading conditions in the numerical analysis. To improve the reliability, the finite element (FE) model was updated and validated. Internal machine elements were modeled as a substructure through a reduced-order modeling method to reduce the computing time and apply a constant gear excitation force. The weak areas of structure were determined and it was used as the design area for optimization. The topology optimization technique was used to reduce the equivalent radiated power (ERP) which was used as an indicator of radiated noise level. The maximum value of the ERP decreased under all operating conditions at the rated speed.

scholarly journals STUDY ON STRUCTURAL-ACOUSTIC CHARACTERISTICS OF CYLINDRICAL SHELL BASED ON WAVENUMBER SPECTRUM ANALYSIS METHOD

Brodogradnja ◽  
2021 ◽  
Vol 72 (2) ◽  
pp. 57-71
Author(s):  
Liu Wenxi ◽  
◽  
Guan Huiren ◽  
Zhou Qidou ◽  
Lou Jingjun
Keyword(s):  
Spectrum Analysis ◽  
Axial Direction ◽  
Exciting Force ◽  
Structural Vibration ◽  
Normal Velocity ◽  
Analysis Method ◽  
Radiated Noise ◽  
Distribution Form ◽  
Wavenumber Spectrum ◽  
The Moment

By the finite element method, the structural vibration response is calculated under the action of the axial exciting force and the moment with different distribution form, and then the transfer function of the mean square normal velocity is analyzed. The wavenumber spectrum analysis method is used to separate and quantify the shell vibration in the wavenumber domain, and then the relation between the structural vibration characteristics and the structural wavelength is summarized. It is concluded that the structural vibration and radiated noise can be reduced under the symmetric action of axial exciting force and the moment. Based on the above conclusion, a symmetrical thrust bearing supporting system is designed and the stiffness of the supporting structure in the axial direction is controlled by selecting suitable size of structural members, therefore, the structural vibration and radiated noise of the submarine is reduced significantly.

scholarly journals Train-Induced Building Vibration and Radiated Noise by Considering Soil Properties

2020 ◽  
Vol 12 (3) ◽  
pp. 937
Author(s):  
Chao Zou ◽  
Yimin Wang ◽  
Ziyu Tao
Keyword(s):  
Soil Properties ◽  
Ground Improvement ◽  
Three Dimensional ◽  
Structural Vibration ◽  
Population Increase ◽  
Land Resource ◽  
Development Mode ◽  
Vibration Transmission ◽  
Radiated Noise ◽  
The Impact

Constructing buildings above subway tracks exploits urban-area space intensively by adopting the three-dimensional overlapping development mode, which is one of the important measures for solving the contradictions among urban population increase, land resource shortage, and environmental protection. However, the vibration generated by the frequent train operations is transmitted to the upper buildings through the track structure and ground soil, which can cause structural vibrations and radiated noise and bring physical and mental side effects to occupants within the buildings. Subway projects are often located in geologically sensitive areas, while the influences of the encountered geological problems on the generation and propagation of structural vibration and structure-radiated noise within the buildings are not yet clear. Hence, this paper presents a method of studying the train-induced vibration transmission from the ground up into the buildings and the structure-radiated noise within the building. The method consists of a train-track model, track-soil-building model, and structure-radiated noise simulation. The impact of soil properties on the building vibration and structure-radiated noise is analyzed and ground-improvement measures are proposed in order to mitigate vibration and structure-radiated noise within buildings. The results show that the interaction between soil and structure has a great impact on vibration transmission from the ground into the building. Good foundations reduce vibration transmission from ground soil up into the building and lead to a lower level of structure-radiated noise. Ground improvements increase the impedance of ground soil, thereby weakening the vibration transmission and lowering the structure-radiated noise.

Numerical Simulation of Valve Timing and Size on a Compressed Air Engine Performance

2011 ◽  
Vol 130-134 ◽  
pp. 781-785
Author(s):  
Ye Jian Qian ◽  
Cheng Ji Zuo ◽  
Zhi Fang Chen ◽  
Hong Ming Xu ◽  
Miroslaw L. Wyszynski
Keyword(s):  
Numerical Simulation ◽  
Renewable Energy ◽  
Engine Performance ◽  
Compressed Air ◽  
System Model ◽  
Valve Timing ◽  
Engine Design ◽  
Engine System ◽  
Critical Requirement ◽  
And Performance

The compressed air engine is receiving increasingly worldwide attention because it takes advantage of renewable energy and has zero exhaust emissions. This paper presents a systematic study on valve timing and size of a prototype compressed air engine for optimizing its efficiency and performance. An in-house air engine system model has been developed using the FLOWMASTER platform. The simulated results show that the optimizing valve timings is probably the most critical requirement in the compressed air engine design process.

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