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首页> 外文会议>Innovative Solutions for the Advancement of the Transport Industry >AN INNOVATIVE APPROACH TO LEVEL REDUCTION ANDSOUND QUALITY ENHANCEMENT OF COMBUSTION NOISE INDIESEL ENGINES
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AN INNOVATIVE APPROACH TO LEVEL REDUCTION ANDSOUND QUALITY ENHANCEMENT OF COMBUSTION NOISE INDIESEL ENGINES

机译：降低燃烧噪声工业级发动机声级和质量的创新方法

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Diesel engines are considered by the European transport industry as a convenient powerplant. Thernlow consumption achievable, and the subsequent reduction in CO2 emissions, together with thernuse of new technologies allowing meeting present and future legislations for pollutant emissionsrnreduction, make them attractive from an environmental viewpoint. However, current and futurernDiesel concepts are intrinsically noisy, and thus it is imperative to consider combustion noise asrnan additional factor in engine development alongside performance, emissions and driveability.rnOtherwise, end-users could be reluctant to drive Diesel-powered vehicles and their potential forrnenvironment preservation could thus be lost or underused. Evaluation procedures are required,rnboth for noise level and sound quality, that may be integrated in the global engine developmentrnprocess in a timely and cost-effective manner, avoiding the need to retort to long and expensivernacoustic tests. In this paper, such a procedure, based on the consideration of suitable indicesrnextracted from in-cylinder pressure, is proposed and validated. Such indices are obtained from anrninnovative decomposition of the in-cylinder pressure signal, so that features associated withrncombustion and with resonance excitation may be properly identified. Indicators obtained may berncorrelated with the overall noise level or with an expert jury mark. In the first case, a prediction ofrnthe radiated noise level more accurate than that obtained from the classical “block attenuation”rnapproach is achieved, while combustion process features related with the resulting noise level canrnbe identified and thus corrective actions may be proposed. In the second case, a direct physicalrnexplanation of subjective issues is not forthcoming but significant correlations may be obtainedrnand thus guidelines for the design of engines with a higher sound quality may be achieved.
机译：柴油发动机被欧洲运输业视为便利的动力装置。可实现的低消耗以及随之而来的二氧化碳排放量的减少，再加上新技术的使用，这些新技术可满足当前和未来减少污染物排放的法规，因此从环境角度来看，它们具有吸引力。然而，当前和未来的柴油概念本质上都是嘈杂的，因此必须在性能，排放和可驾驶性方面将燃烧噪声作为发动机发展的附加因素。否则，最终用户可能不愿驾驶柴油动力汽车及其潜在的环境因此，保存可能会丢失或使用不足。需要评估程序，包括噪声水平和声音质量，这些评估程序可以及时，经济高效地整合到全球发动机开发过程中，从而避免了对冗长而昂贵的声学测试的需求。在本文中，基于对缸内压力提取的合适指标的考虑，提出并验证了这种方法。这些指数是通过缸内压力信号的创新分解获得的，因此可以正确识别与燃烧和共振激发相关的特征。所获得的指标可能与总体噪声水平或专家陪审团标志无关。在第一种情况下，可以实现对辐射噪声水平的预测比从经典“块衰减”方法获得的预测更准确，同时可以识别与所产生的噪声水平相关的燃烧过程特征，因此可以提出纠正措施。在第二种情况下，主观问题没有直接的物理解释，而是可以得到显着的相关性，因此可以实现具有更高音质的发动机设计指南。

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