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| 1 | 强干扰环境中挖掘机噪声独立分量分析显示文摘为了确定挖掘机的噪声源,采用声学照相机对挖掘机噪声进行测试,并利用独立分量分析方法对测试噪声信号进行分离研究。根据测试环境存在强烈的背景噪声与回声干扰的特点,建立基于快速固定点独立分量频域复数算法的噪声分离模型,分析得到主要噪声源独立分量的主频率。为找到这些频率对应的零部件,利用Ansys软件对柴油机表面主要零部件进行振型模态分析,并将噪声测试方向上振型模态的共振频率与独立分量主频率进行对比。研究结果表明:利用独立分量频域复数算法能快速有效地分离含背景噪声和回声干扰的噪声信号;通过对比振型模态与独立分量主频率可找到机体、气缸盖、气门室盖等主要表面噪声辐射源。 | 廖力达 何清华 胡钟林 张大庆 | 2012 | 中南大学学报(自然科学版)2012，43，9： | 4 |
| 2 | Psychoacoustic Study on Contribution of Fan Noise to Engine Noise显示文摘There are more researches on engine fan noise control focusing on reducing fan noise level through optimizing fan structure,and a lot of research achievements have been obtained.However,researches on the effect of fan noise to engine noise quality are lacking.The influences of the effects of fan structure optimization on the engine noise quality are unclear.Thus,there will be a decline in fan noise level,but the deterioration of engine noise quality.Aiming at the above problems,in consideration of fan structure design and engine noise quality,an innovative method to analyze the contribution of fan noise to engine noise quality using psychoacoustic theory is proposed.The noises of diesel engine installing different cooling fans are measured by using the acoustic pressure method.The experiment results are regarded as analysis samples.The model of sensory pleasantness is used to analyze the sound quality of a diesel engine with different cooling fans.Results show that after installing 10-blade fan in medium diameter the sensory pleasantness at each test point is increased,and the increase is 13.53% on average,which indicate the improvement of the engine noise quality.In order to verify the psychoacoustical analysis,the subjective assessment is carried out.The test result shows the noise quality of engine installed10-blade fan in medium diameter is most superior.1/3 octave frequency spectrum analysis is used to study the reason of the improvement of engine noise quality.It is found that after installing proper cooling fan the sound pressure level below 400 Hz are obviously increased,the frequency assignment and spectral envelope are more reasonable and a proper cooling fan can optimize the spectrum structure of the engine noise.The psychoacoustic study is applied in the contribution of fan noise to engine noise,and the idea of engine sound quality improvement through the structure optimization is proposed. | ZHANG Junhong LIU Hai BI Fengrong NI Guangjian ZHANG Guichang LIN Jiewei YU Hanzhengnan | 2012 | Chinese Journal of Mechanical Engineering2012，25，4： | 3 |
| 3 | 轮式装载机驾驶室噪声源分离和识别显示文摘为了改善装载机的噪声状况,提高产品的噪声分析技术水平及产品市场竞争力,采用鲁棒独立分量分析(RobustICA)的方法,对ZL50轮式装载机驾驶室噪声进行了声源识别的研究.主要采用RobustICA算法对测得的驾驶室噪声信号进行了盲源分离,得到一系列独立的噪声分量,利用连续小波变换和相干分析对分离得到的各独立分量进行了分析,时频分析和相干分析结果确定了分离得到的各独立分量和不同噪声源的对应关系.结果表明,采用该方法分离得到的独立分量分别对应着装载机的排气噪声和风扇噪声,且两者为司机耳旁噪声的主要成分.验证了鲁棒独立分量分析在声源分离和识别领域的优越性. | 刘宏骏 毕凤荣 张剑 | 2015 | 工程设计学报2015，22，1： | 2 |
| 4 | 挖掘机用柴油机噪声源的识别显示文摘为了有效降低某型液压挖掘机的辐射噪声,对某挖掘机用柴油机的噪声源进行了识别研究。采用声学照相机对挖掘机噪声信号进行了测试,找到最大噪声源区域并记录噪声信号。根据测试环境受到回声与背景噪声干扰的特点,建立了基于快速固定点独立分量分析频域复数算法的噪声分离模型,通过独立分量分析得到了40个独立分量及其主频。为了确定这些主频对应的零部件,对柴油机表面主要零部件进行了模态分析。将在测试噪声方向上振型模态的共振频率与独立分量分析得出的各分量的主频相比较,找到了机体、气门室盖、气缸盖等主要表面噪声源。研究结果表明:运用独立分量分析和模态分析相结合的方法,可以准确识别挖掘机用柴油机表面噪声辐射源。这种方法可以广泛应用于复杂机器噪声源识别以及故障诊断等领域。 | 陈欠根 张国浩 | 2012 | 广西大学学报(自然科学版)2012，37，5： | 2 |
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