共查询到18条相似文献,搜索用时 91 毫秒
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《中国公路学报》2017,(6)
针对中国某汽车企业传动系声品质评价问题,开展了该传动系声品质的主观评价,建立了与主观评价相统一的声品质客观评价模型。传动系噪声在半消声室试验台架上测试获得,测试工况包括全工作转速范围的匀加速和部分定速工况,通过测试数据的一致性分析确定用于声品质分析的噪声样本;综合考虑该传动系噪声的物理特征和人耳的听觉特性,并依据声品质主观评价方法的内涵属性,选择语义细分法作为声品质主观评价方法。研究结果表明:从强度、音调、音色等多个维度出发,建立汉语背景下语义细分法的语义空间,运用专家咨询法、项目区分度、主成分分析和因子分析方法,可以确定语义空间中适用于汽车传动系声品质评价的评价指标,并验证了其有效性;选取评价主体完成该传动系声品质的主观听音试验,获得主观评价结果;选取响度、尖锐度、语言清晰度等指标作为该传动系噪声客观评价指标并计算出结果;以主观评价结果为应变量,客观指标计算结果为自变量,通过一元回归分析,发现响度、尖锐度、语言清晰度与主观评价结果相关性较好;以主观评价结果为响应,多个客观指标计算结果为输入,运用多元回归分析方法及支持向量机智能建模方法,建立了该传动系啸叫客观评价的回归模型和人工智能模型,并进行了验证,实现了该汽车传动系声品质的客观量化评价。 相似文献
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汽车的进气噪声能够直接影响车内的噪声水平和声品质。在车内动力感声品质研究过程中,需要借助进气噪声能量增强车内噪声的动力感,在发动机半消声室单纯测试进气噪声的传统方法无法满足汽车声品质研究需要。因此,本文中提出了一种在整车半消声室NVH底盘测功机上同时获得进气噪声和车内噪声的方法,通过现场测试人员的主观感受和测试数据的分析,验证了该方法的有效性,能够获得相对纯净的进气噪声;并对研究车型急加速工况下的进气噪声和车内噪声品质的关联性进行了分析,通过对4个典型的声品质客观参量的对比分析发现进气噪声是车内动力感声品质实现中比较优秀的噪声源,其研究对汽车声品质设计具有重要意义。 相似文献
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载货汽车车内噪声的控制 总被引:2,自引:0,他引:2
介绍了汽车车内噪声的评价指标和CA1091K2L2型汽车噪声控制的研究成果。车内噪声的控制,应首先考虑抑制发动机的辐射噪声。在驾驶室密封好的前题下,应对透声严重的驾驶室围板和底板采取隔声措施,使车内噪声降到最低程度,然后再考虑吸声材料的使用以及避免驾驶室空腔共振的措施。 相似文献
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本文主要讨论主观评价的基本原理及其在汽车开发研究领域中的应用。主观评价基本原理方面主要讨论概念、要素和与客观评价的区别。汽车开发研究领域的应用主要选取在汽车操纵稳定性、噪声品质、平顺性等方面中主观评价的应用。 相似文献
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支持向量机在汽车加速车内声品质预测中的应用 总被引:1,自引:0,他引:1
《汽车工程》2015,(11)
应用支持向量机方法对汽车加速时车内声品质进行预测。以噪声样本的响度、尖锐度、粗糙度、AI指数等客观评价参量作为输入因子,主观烦躁度评价结果作为输出因子,利用支持向量机回归方法建立了汽车加速车内声品质的预测模型。对比结果表明,与多元线性回归模型相比,基于支持向量机的汽车加速车内声品质预测模型能够更准确地反映客观评价参量与主观烦躁度之间的非线性映射关系,预测精度更高。 相似文献
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以某型纯电动公交客车的驱动电机噪声为评价对象,进行双通道噪声信号采集用以便合成立体声来模拟人耳听觉,并按照3 dB的级差逐级衰减噪声信号的声压级以生成噪声样本序列用于人体主观感受的测试。进而通过高保真音频回放逐一考察各噪声样本作用下的人体舒适性/不舒适性主观感受,并以规定的"描述符"对其加以说明,同时采用评分方式进行量化。在此基础上,揭示出主观感受声学舒适性与不舒适性之间的相互关系,并划定出与舒适性感受相对应的噪声样本集合,以之为依据,进一步确立了驱动电机声学舒适性的评价方法。 相似文献
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汽车关门声声品质评价方法的研究 总被引:3,自引:0,他引:3
介绍了基于A计权声压级时频特性的汽车关门声品质评价方法,建立了Zwicker瞬时响度与时变响度、Moore瞬时响度与时变响度和尖锐度的计算模型,分析了各种模型对汽车关门声品质评价的适用性;最后建立了以A计权声压级时频特性、尖锐度和瞬时响度为指标的汽车关门声品质评价方法,并通过对两个关门声样本的评价,验证了该方法的可行性。 相似文献
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The intake system in an automotive engine has a short duct compared with that of the exhaust system. The filtered-x LMS (FX-LMS)
algorithm has been applied to the active noise control (ANC) system in a short acoustic duct. This algorithm design is based
on the FIR (finite impulse response) filter; however, it has a slow convergence issue due to a large number of zero coefficients.
To improve the convergence performance, the step size of the LMS algorithm was modified from fixed to variable. However, this
algorithm is still not suitable for the ANC system of a short acoustic duct because the reference signal is affected by the
backward acoustic wave propagated from a secondary source. Therefore, the recursive filtered-u LMS algorithm (FU-LMS) based
on the infinite impulse response (IIR) is developed to consider backward acoustic propagation. Generally, this algorithm has
a stability problem. The stability issue was improved using an error-smoothing filter. In this paper, the recursive LMS algorithm
with a variable step size and smoothing error filter is designed. This recursive LMS algorithm, the FU-VSSLMS algorithm, uses
an IIR filter. With fast convergence and good stability, this algorithm is suitable for the ANC system in a short acoustic
duct, such as the intake system of an automotive engine. This algorithm is applied to the ANC system of a short acoustic duct.
The disturbance signals used as primary noise source are a sinusoidal signal embedded in white noise and the chirp signal,
which has a variable instantaneous frequency. The test results demonstrate that the FU-VSSLMS algorithm has a superior convergence
performance when compared with the FX-LMS and FX-LMS algorithms. The algorithm can be successfully applied to the ANC system
in a short duct, such as the intake duct. 相似文献
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汽车高速时的侧风稳定性对其主动安全有着至关重要的影响。文章系统介绍了汽车侧风稳定性的研究背景及国内外的研究现状,探讨了汽车侧风稳定性的研究内容,包括汽车参数的影响、汽车造型的影响、不同侧风的影响、侧风稳定性的评价研究、侧风稳定性试验,展望了高速汽车侧风稳定性研究的发展趋势。 相似文献
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This paper presents a novel approach to apply the physiological signal of the human brain to the sound quality evaluation of automotive sound. In the previous work, psychoacoustic metrics were applied to the sound quality evaluation of automotive sound. Loudness among psychoacoustic metrics is used for one of major sound metrics for the objective evaluation of the sound quality of the acceleration sound inside a car. Subjective evaluation of the sound quality of the acceleration sound shows different results depending on the two different groups of participants. One group liked powerful sound when a car is accelerated: the other group liked the refine sound. Loudness of the acceleration sound is not correlated with the subjective rating of the former group whilst it is correlated with that of the latter group. This evaluation suggests that for the people who like the powerful acceleration sound, it needs to find the sound metric for the objective evaluation of the sound quality of the acceleration sound. In this paper, a driver’s brain signal is measured using electroencephalography (EEG) when a driver hears the acceleration sound of passenger cars. The signal is analyzed to obtain the relationship between brain signals and human perception. According to these results, the alpha wave correlates to the human perception of powerful sound quality of passenger cars. This interesting relationship can be used for objective evaluation of passenger car sounds. 相似文献