• Title, Summary, Keyword: Engine Noise

Search Result 859, Processing Time 0.051 seconds

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
    • /
    • /
    • pp.326-329
    • /
    • 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.

  • PDF

Certification of Noise in Medium Speed Diesel Engine Test Shop (중형 엔진 시운전장의 소음 원인 규명)

  • Cho, S.Y.;Oh, K.T.;Kim, H.W.;Ha, J.S.;Kim, K.S.
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • /
    • pp.1693-1698
    • /
    • 2000
  • In operating test of medium speed diesel engine, the large noise over 110dBA would be occurred, and silencer should be needed to prevent the transmission of noise through exhaust duct. A near neighborhood of medium speed engine test shop, outbreak of low frequency noise was reported. From the result of noise measurement, it was found that the coupling of engine noise and air column between workshops was main cause of annoying low frequency noise. From this study, 3 ways of reformation methods were proposed; insertion of plenum chamber, placement of baffles, and alteration of direction of exhaust. As a result of these modification, low frequency noise was cancelled out.

  • PDF

An Experimental Study on Identification of Noise Generation Mechanism And Its Improvement in Gerotor Oil Pump (직동식 오일 펌프의 소음 발생 메커니즘 규명과 개선에 관한 실험적 연구)

  • Jung, Byung-Hwan;Jeong, Won-Jo;Shin, Dal-Heun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • /
    • pp.121-127
    • /
    • 2012
  • Whine noise in engine oil pump system was issued in developing an engine. Generally, A noise of engine oil pump largely are classified two cases. The first one is a gearing noise caused by relative motion of inner rotor and outer rotor. The other is fluid pulsation noise caused by oil pressure fluctuation. The aim of the paper is to identify a noise mechanism in engine oil pump and improve its Noise. Also, it suggests to the guide line on the design of oil pump.

  • PDF

An Experimental Study of Engine Mount Optimization to Improve Noise and Vibration Quality of F.R. Vehicle (후륜구동 차량의 소음 진동 성능향상을 위한 엔진마운트 최적설계에 관한 실험적 연구)

  • 이준용;김찬묵
    • Journal of KSNVE
    • /
    • v.7 no.4
    • /
    • pp.681-688
    • /
    • 1997
  • The purpose of engine mount system is to reduce the noise and vibration caused by engine vibration, and to decouple the roll and bounce mode at idle. To reduce the noise and vibration level in a vehicle, it is important to make the design optimization of engine mount system that consider the moment of inertia and inclination of mount rubber. As a result, according to the definition of Torque Roll Axis (TRA), the vibration axis at idle must be on the TRA or very close to it. In this paper, we studied the effect of the design optimization of engine mount system. And we have achieved good improvements in noise and vibration quality of F.R. vehicle.

  • PDF

Control Characteristics of ER engine mount considering Temperature Variation (온도 변화에 따른 ER 엔진마운트의 제어 특성)

  • Song, Hyun-Jeong;Choi, Seung-Bok
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • /
    • pp.180-183
    • /
    • 2005
  • The engine mount of vehicle systems is role of support engine mass and isolate noise and vibration from engine disturbance forces. One of attractive candidates to achieve this goai is to utilize a semi-active ER engine mount. By applying this, we can effectively control damping force and hence the noise and vibration by just controlling the intensity of electric field. However, control performance of the engine mount may be very sensitive to temperature variation during engine operation. In this work, we Investigate dynamic performances of ER engine mount with respect to the temperature variation. In order to undertake this, a flow-mode type of ER engine mount is designed and manufactured. Displacement transmissibility is experimentally and numerically evaluated as a function of the electric field. The ER engine mount is then incorporated with full-vehicle model in order to investigate vibration control performance. After formulating the governing equation of motion, a semi-active controller is designed. The controller is implemented through a hardware-in-the-loop simulation (HILS), and control responses such as acceleration level at various engine speeds are evaluated in the frequency and time domains.

  • PDF

Diesel Combustion Noise Reduction based on the Numerical Simulation (디젤 엔진소음 II)

  • 강종민;안기환;조우흠;권몽주
    • Journal of KSNVE
    • /
    • v.7 no.6
    • /
    • pp.909-918
    • /
    • 1997
  • Combustion oriented noise is a part of engine noise, which is mainly determined by the in-cylinder pressure profile and the structure attenuation of an engine. A numerical model for predicting the in-cylinder pressure profile and the resultant combustion noise developed by the use of a commercial code. The model is experimentally validated and updated based on the performance as well as the noise by considering the fuel injection timing, the fuel injection rate, Cetane number, intake temperature, and compression ratio. For providing a design guide of a fuel injector for a low combustion noise engine model, the optimal parameters of injection pressure profile, injection rate profile, and injection timing are determined, which gives the 5 dBA noise reduction.

  • PDF

The Diesel Engine and the Environment - Noise

  • Bryndum, Lars
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • /
    • pp.37-45
    • /
    • 2003
  • The diesel engines was invented a little more than one hundred years ago and has ever since been developed for better fuel economy, increased power and smaller size. Thanks to its fuel economy, the diesel engine is today the dominating prime mover in many applications, such as smaller power plants, commercial ships, trains, trucks, buses and all kinds of mobile construction machinery. As engine for passenger cars, the diesel engine is steadily increasing its share of the market. However, its versatility and, consequently, large prevalence have led to environmental demands to its exhaust emissions, noise and vibration. This paper deals with the noise aspects of diesel engine designs of the so-called low speed two-stroke type installed in most large ships.

  • PDF

Development of Sound Quality for a Vehicle by Controlling CVVT (CVVT 제어를 이용한 차량 음질 개발)

  • Kim, Young-Ki;Cho, Teock-Hyeong;Kim, Jae-Heon;Kang, Koo-Tae
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • /
    • pp.622-625
    • /
    • 2007
  • For optimizing the performance of SI engine such as engine torque, fuel consumption, and emissions, systems for variable valve timing were developed by many automotive researchers. In this work, we investigated the relationship between valve timing and intake orifice noise to improve the NVH (Noise, Vibration and Harshness) performance as well as engine torque and power. Two approaches are conducted, which are engine dynamometer testing and 1-D simulation analysis. Experimental data were measured on about 21 different operating conditions. This experiment shows that the intake and exhaust valve timing related to overlap period influence on the NVH performance, especially intake orifice noise of engine at given range of operation conditions. Similar results are achieved by using 1-D simulation analysis. It is concluded that the optimal strategies of controlling valve timing and tuning intake systems, are necessary to develop engines or vehicles with good sound quality.

  • PDF

Implementation of Active Sound Enrichment Control for Improving Engine Sound Quality Inside the Cabin of a Passenger Car (차량 실내공간의 가속 시 엔진음 음질 향상을 위한 실시간 능동음향증강 제어 구현)

  • Lee, Young-Sup;Kim, Jeakwan;Ryu, Seokhoon;Kim, Seonghyeon;Park, Dong Chul
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.26 no.2
    • /
    • pp.195-202
    • /
    • 2016
  • In this study, a concept of active sound enrichment (ASE) control system was implemented and demonstrated for improving engine sound quality inside the cabin of a passenger car during acceleration. Unlike the active noise control cancels the noise for disturbance rejection, the ASE adds additional sound to the noise for tracking control. This approach requires a new algorithm to provide additional artificial sound to the original engine sound using active control strategy to achieve a target sound profile, which is predefined to satisfy required interior sound quality. The ASE algorithm was implemented in a digital controller dSPACE DS1401 and real-time control experiment was accomplished in an actual car. The ASE control results show that the actively enriched sound of each engine order against RPM tracks the target profiles precisely and quickly and improves the discontinuity, the level ratios and the sound pressure level of each engine order. Thus it is anticipated the ASE system can be applied for the improvement of the engine sound quality inside the cabin during acceleration.

Noise Properties of Diesel Electric Locomotive (디젤전기기관차의 기관소음 특성)

  • 이덕희;조준호;정우성
    • Proceedings of the KSR Conference
    • /
    • /
    • pp.187-191
    • /
    • 2001
  • Diesel locomotive engine is the main source of train noise in these days but hard to reduce the level by barrier for it emitted from high location. For the passing high level noise properties of diesel locomotive engine, there are needs of changing the environmental railway limit to maximum level from equivalent. In this study we investigate the noise characteristics of the diesel electric locomotive according to the change of notch. From the result we found out the frequency of engine cycle noise and the shape of noise spectrum.

  • PDF