Turbocharger Noise - Generation and Control

Åbom, Mats; Kabral, Raimo

doi:10.4271/2014-36-0802

Cited by 12 publications

(5 citation statements)

References 7 publications

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“…Unfortunately, the noise emissions generated by turbochargers become a non-negligible part of the engine noise source, hindering environmentally sustainable development to some extent [8,9]. In addition, due to the increase in output power requirements for diesel engines, the turbocharger pressure ratio increases, resulting in an increase in the compressor load and higher aerodynamic noise emissions [10,11]. The existing literature indicates that aerodynamic noise is considered to be the main noise source in turbochargers [12,13].…”

Section: Introductionmentioning

confidence: 99%

An Explainable Prediction Model for Aerodynamic Noise of an Engine Turbocharger Compressor Using an Ensemble Learning and Shapley Additive Explanations Approach

Huang,

Ni,

Qiao

et al. 2023

Sustainability

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In the fields of environment and transportation, the aerodynamic noise emissions emitted from heavy-duty diesel engine turbocharger compressors are of great harm to the environment and human health, which needs to be addressed urgently. However, for the study of compressor aerodynamic noise, particularly at the full operating range, experimental or numerical simulation methods are costly or long-period, which do not match engineering requirements. To fill this gap, a method based on ensemble learning is proposed to predict aerodynamic noise. In this study, 10,773 datasets were collected to establish and normalize an aerodynamic noise dataset. Four ensemble learning algorithms (random forest, extreme gradient boosting, categorical boosting (CatBoost) and light gradient boosting machine) were applied to establish the mapping functions between the total sound pressure level (SPL) of the aerodynamic noise and the speed, mass flow rate, pressure ratio and frequency of the compressor. The results showed that, among the four models, the CatBoost model had the best prediction performance with a correlation coefficient and root mean square error of 0.984798 and 0.000628, respectively. In addition, the error between the predicted total SPL and the observed value was the smallest, at only 0.37%. Therefore, the method based on the CatBoost algorithm to predict aerodynamic noise is proposed. For different operating points of the compressor, the CatBoost model had high prediction accuracy. The noise contour cloud in the predicted MAP from the CatBoost model was better at characterizing the variation in the total SPL. The maximum and minimum total SPLs were 122.53 dB and 115.42 dB, respectively. To further interpret the model, an analysis conducted by applying the Shapley Additive Explanation algorithm showed that frequency significantly affected the SPL, while the speed, mass flow rate and pressure ratio had little effect on the SPL. Therefore, the proposed method based on the CatBoost algorithm could well predict aerodynamic noise emissions from a turbocharger compressor.

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Section: Introductionmentioning

confidence: 99%

An Explainable Prediction Model for Aerodynamic Noise of an Engine Turbocharger Compressor Using an Ensemble Learning and Shapley Additive Explanations Approach

Huang,

Ni,

Qiao

et al. 2023

Sustainability

View full text Add to dashboard Cite

show abstract

“…However, in addition to the combustion and mechanical noise in the engine cylinder, the noise generated by the turbocharger becomes a non-negligible part of the engine noise source [6]. Due to the increase in the output power requirements of diesel engines, the turbocharger pressure ratio increases, leading to a rise in the compressor load and higher aerodynamic noise emissions [7,8]. In the existing literature, aerodynamic noise is considered the main noise source of turbochargers [9,10].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Mechanism Study of Aerodynamic Noise Emission Characteristics from a Turbocharger Compressor of Heavy-Duty Diesel Engine Based on Full Operating Range

Huang

Wang

et al. 2023

Sustainability

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Heavy-duty diesel engines equipped with turbochargers is an effective way to alleviate energy shortage and reduce gas emissions, but their compressor aerodynamic noise emissions have become an important issue that needs to be addressed urgently. Therefore, to study the aerodynamic noise emission characteristics of a compressor during the full operating range, experimental and numerical simulation methods were used to analyze the aerodynamic noise emissions. The results showed that aerodynamic noise’s total sound pressure level (SPL) increased with increased speed under the test conditions. At low speeds, the total SPL of aerodynamic noise was affected by the mass flow of the compressor more obviously. The maximum difference of aerodynamic noise total SPL was 1.55 dB at 60,000 r/min under different mass flows. At the same speed, the compressor could achieve lower aerodynamic noise emissions by operating in the high-efficiency region (middle mass flows). In the compressor aerodynamic noises, the blade passing frequency (BPF) noise played a dominant role. The transient acoustic-vibration spectral characteristics and fluctuation pressure analysis indicated that BPF and its harmonic frequency noises were mainly caused by the unsteady fluctuation pressure. As the speed increased, the BPF noise contributed more to the total SPL of the aerodynamic noise, and its percentage was up to 75.35%. The novelty of this study was the analysis of the relationship between compressor aerodynamic noise and internal flow characteristics at full operating conditions. It provided a theoretical basis for reducing the heavy-duty diesel engine turbocharger compressor aerodynamic noise emissions.

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“…In more than an octave, noise reduction was more than 30 dB for its high damping effects. 18,19 Tian et al 20 introduced a reactive silencer to reduce turbocharger synchronous noise, and the results obtained in a vehicle test indicated that the silencer can reduce noise effectively in the frequency range of 1000-5000 Hz. The aforementioned researches obtained many benefits from the compressor intake noise control, but they mainly concentrated on the automotive turbocharger broadband noise.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental analyses of intake silencer and its effects on turbocharger compressor performance

Liu

Cao

Yang

et al. 2019

Advances in Mechanical Engineering

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Numerical studies of a marine diesel engine intake silencer are conducted to evaluate its performance, and effects of the silencer on the turbocharger compressor performance are also discussed. The results show that the duct acoustic mode method can be used in the silencer transmission loss prediction, and the predicted noise reduction and main frequency range agree with the measurements fairly well. However, it is found that the silencer compromises the compressor performance by shortening its operating range. It is found that the static pressure on the compressor blade surface is decreased, thus the compressor total-to-total pressure ratio and isentropic efficiency are reduced. Pressure fluctuations at compressor rotor and stator inlets enhanced when a silencer is installed, which means the trend of pressure spectrum in the rotor and stator passage is changed. Compared with the results of a compressor in natural aspiration, it is found that the silencer can significantly reduce high-frequency noise. In particular, it is quite effective in tonal noise reduction. In addition, the compressor inlet noise spectrum indicates that noise radiation characteristics are different with a silencer installed.

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Turbocharger Noise - Generation and Control

Cited by 12 publications

References 7 publications

An Explainable Prediction Model for Aerodynamic Noise of an Engine Turbocharger Compressor Using an Ensemble Learning and Shapley Additive Explanations Approach

An Explainable Prediction Model for Aerodynamic Noise of an Engine Turbocharger Compressor Using an Ensemble Learning and Shapley Additive Explanations Approach

Experimental and Mechanism Study of Aerodynamic Noise Emission Characteristics from a Turbocharger Compressor of Heavy-Duty Diesel Engine Based on Full Operating Range

Numerical and experimental analyses of intake silencer and its effects on turbocharger compressor performance

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