• Title, Summary, Keyword: Intake Noise

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STUDY ON THE OPTIMAL DESIGN OF A VEHICLE INTAKE SYSTEM USING THE BOOMING NOISE AND THE SOUND QUALITY EVALUATION INDEX

  • LEE J. K.;PARK Y. W.;CHAI J. B.
    • International Journal of Automotive Technology
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    • v.7 no.1
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    • pp.43-49
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    • 2006
  • In this paper, an index for the evaluation of a vehicle intake booming noise and intake sound quality were developed through a correlation analysis and a multiple factor regression analysis of objective measurement and subjective evaluation data. At first, an intake orifice noise was measured at the wide-open throttle test condition. And then, an acoustic transfer function between intake orifice noise and interior noise at the steady state condition was estimated. Simultaneously, subjective evaluation was carried out with a 10-scale score by 8 intake noise and vibration expert evaluators. Next, the correlation analysis between the psychoacoustic parameters derived from the measured data and the subjective evaluation was performed. The most critical factor was determined and the corresponding index for intake booming noise and sound quality are obtained from the multiple factor regression method. And, the optimal design of intake system was studied using the booming noise and the sound quality evaluation index for expectation performance of intake system. Conclusively, the optimal designing parameters of intake system from noise level and sound quality whose point of view were extracted by adapting comparative weighting between the booming noise and sound quality evaluation index, which optimized the process. These work could be represented guideline to system engineers, designers and test engineers about optimization procedure of system performance by considering both of noise level and sound quality.

Development of Active Intake Noise Control Algorithm for Improvement Control Performance under Rapid Acceleration and Disturbance (L-Point Running Average Filter를 이용한 급가속 흡기계의 능동소음제어 성능향상을 위한 알고리즘 개발)

  • 전기원;조용구;오재응;이정윤
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.780-783
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    • 2004
  • Recently Intake noise has been extensively studied to reduce the engine noise. In order to diminish intake noise several resonators were added to the intake system. However this can cause a reduction of engine output power and an increase of fuel consumption. In this study, active noise control simulation of the Filtered-x LMS algorithm is applied real instrumentation intake noise data under rapid acceleration because intake noise is more excessively increased under the such a harsh condition. But the FXLMS algorithm has poor control performance when the system is disturbed. Thus modified FXLMS algorithm using L-point running average filter is developed to improve the control performance under the rapid acceleration and disturbance. The noise reduction quantity of modified Filtered-x LMS algorithm is more than original one in two cases. In the case of control for real instrumentation intake noise data, maximum residual noise of modified FXLMS algorithm is 2.5 times less than applied the FXLMS and also in the case of disturbed, the modified FXLMS algorithm shows excellent control performance but FXLMS algorithm cat not control.

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Reduction of Aeroacoustic Noise from Intake Head of a Vacuum Cleaner (진공청소기 흡입유로의 공력소음 개선)

  • Koo, Jeong-Su;Hwang, Won-Gul;Oh, Il-Kwon;Oh, Jang-Guen;Song, Hwa-Gyu
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.202-207
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    • 2006
  • The aeroacoustic noise from intake head of a vacuum cleaner is caused by complicated transient pressure fluctuation and it greatly affects the overall SPL of the vacuum cleaner. In this study, we intended to decrease the overall SPL by reducing the aeroacoustic noise from intake head. In the first the place, we analyzed the aeroacoustic noise from the unsteady fluid analysis of intake head. And then, we grasped the dominant frequency band from the aeroacoustic noise by comparing the spectrum distributions between examinations and analyses. Also, we systematically investigated the aeroacoustic noise sources from each part composing the intake head. Consequently, we redesigned each part of the dominant noise sources and suggested the modified intake head, resulting in the reduction ortho overall SPL by 3.6dB(A).

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Numerical Study on the Radiation of Intake Noise from Internal Combustion Engine by Using Essentially Non-Oscillatory Schemes (ENO기법을 이용한 연소 엔진 흡기계 소음의 방사에 관한 수치적 연구)

  • 김용석;이덕주
    • Journal of KSNVE
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    • v.8 no.2
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    • pp.239-250
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    • 1998
  • Traditionally, intake noise from internal combustion engine has not recevied much attention compared to exhaust noise. But nowadays, intake noise is a major contributing factor to automotive passenger compartment noise levels. The main objective of this paper is to identify the mechanism of generation, propagation and radiation of the intake noise. With a simplest geometric model, one of the main noise sources for the intake stroke is found to be the pressure surge, which is generated after intake valve closing. The pressure surge, which has the nonlinear acoustic behavior, propagates and radiates with relatively large amplitude. In this paper, unsteady compressible Navier-Stokes equations are employed for the intake stroke of axisymmetric model having a single moving cylinder and a single moving intake valve. To simulate the periodic motion of the piston and the valve, unsteady deforming mesh algorithm is employed and Thompson's non-reflecting boundary condition is applied to the radiation field. In order to resolve the small amplitude waves at the radiation field, essentially non-oscillatory(ENO) schemes with an artificial compression method (ACM) are used.

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The Study on the Performance Improvement and the Development of Active Intake Noise Control System (능동홉기소음제어 시스템의 개발 및 성능향상에 관한 연구)

  • 이충휘;오재응;심현진;이유엽
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.326-329
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    • 2002
  • Engine noise is one of the major causes of the interior noise, and so has been studied in various ways in recent days. Recently Intake noise has been extensively studied to reduce the engine noise. Conventional method to reduce the noise is adding several resonators to the induction system. However this causes a reduction of engine output power and an increase of fuel consumption. In this study, the prototype of Active Intake Noise Control System is developed by using the Filtered-x LMS algorithm to reduce the Intake noise during acceleration. Intake noise is more excessively increased when the engine is rapidly accelerated. So, Normalized LMS algorithm is applied to improve the control performance under the rapid acceleration.

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Experimental Analysis of Flow Fields inside Intake Heads of a Vacuum Cleaner

  • Daichin;Lee, Sang-Joon
    • Journal of Mechanical Science and Technology
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    • v.19 no.3
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    • pp.894-904
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    • 2005
  • The flow structure inside the intake head greatly affects the working efficiency of a vacuum cleaner such as suction power and aero-acoustic noise. In this study, the flow inside intake heads of a vacuum cleaner was investigated using qualitative flow visualization and quantitative PIV (Particle Image Velocimetry) techniques. The aerodynamic power, suction efficiency and noise level of the intake heads were also measured. In order to improve the performance of the vacuum cleaner, inner structure of the flow paths of the intake head, such as trench height and shape of connection chamber were modified. The flow structures of modified intake heads were compared with that of the original intake head. The aero-acoustic noise caused by flow separation was reduced and the suction efficiency was also changed due to flow path modification of intake head. In this paper, the variations of flow fields for different intake heads are presented and discussed together with results of aerodynamic power, suction efficiency and noise level.

Development of a Sound Quality Index for the Evaluation of an Intake Noise of a Passenger Car (급가속시 차량의 흡기소음에 대한 음질지수 개발)

  • Lee, J.K.;Park, Y.W.;Chai, J.B.
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.15 no.8
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    • pp.939-944
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    • 2005
  • In this paper, a sound quality index for the evaluation of the vehicle intake noise was developed through a correlation analysis of the objective measurement and the subjective evaluation. First, intake orifice noise was measured at the wide-open throttle sweep condition. And then, the acoustic transfer function between intake orifice noise and interior noise was measured. Simultaneously, subjective evaluation was carried out with a 10-scale score by 8 special engineers. The correlation analysis between the psychoacoustic parameters derived from the measurement and the subjective evaluation was performed. The most critical factor was determined and the corresponding sound quality index for intake noise was obtained from the multiple factor regression analysis method. Finally, the effectiveness of the proposed index was validated.

Intake Noise Control of Diesel Power Plant using Combined Silencer (조합형 소음기를 이용한 육상발전용 디젤 엔진의 흡기 소음 제어)

  • Song, Keun-Bok;Joo, Won-Ho;Kim, Dong-Hae
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.861-866
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    • 2012
  • Turbo-charger noise radiated from air intake part is one of the most important noise sources in diesel power plant. In this paper, intake noise control of the diesel power plant was studied using parallel baffle type silencer and concentric hole-cavity resonator simultaneously. Firstly, acoustical characteristics and attenuation performance for parallel baffle type silencer were investigated through theoretical approach and experimental method. Based on the results, optimal design of the parallel baffle silencer was suggested. Secondly, for reducing the low frequency noise contained in the intake noise, the concentric hole-type resonator was developed and the acoustic performance was verified from the test. By combining two types of silencers, it is expected that the overall insertion loss is about 50 dB. So, the combined silencer is very helpful in reducing the intake noise of diesel power plant.

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The Development of a design approach for reducing intake noise of vehicle (자동차 흡기소음저감을 위한 설게기법에 관한 연구)

  • 오재응;한광희
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.41-46
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    • 1996
  • The engine intake system noise has been recognized as a problem for many years. Acoustic design of intake system has traditionally been a trial and error process. This has resulted in the development of computer simulation program for a acoustic analysis and acoustic modeling. In this study, we developed the program based on the transfer matrix method which analyze and predict the performance of a intake noise. The program was verified by experiments on a real intake system. By using of the simulation program, we analyzed acoustic characteristics and, made proposals of improvement to reduce the intake noise and was verified by the SYSNOISE software.

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The Optimal Design for Noise Reduction of the Intake System in Automobile Using DACE Model (전산 실험 모형을 적용한 자동차 흡기계의 소음 저감에 대한 최적 설계)

  • Ryu, Je-Seon;Jin, Jung-Un;Cha, Kyung-Joon;Oh, Jae-Eung;Sim, Hyoun-Jin
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.15 no.10
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    • pp.1123-1130
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    • 2005
  • We propose an optimal design to improve the capacity by reducing the noise of the intake system. The length and radius of each component of the current Intake system are selected as control factors. We accept the output from computer simulator with orthogonal arrays. Then, the Kriging estimates are computed. From this, we exploit the optimal design of the intake system by adapting simulated annealing. From the results of this optimal design, we conclude that Kriging method with the orthogonal arrays is the efficient method for Design and Analysis of Computer Experiments and we propose the useful results for the low noise intake system.