共查询到17条相似文献,搜索用时 515 毫秒
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在研究汽车车内噪声的过程中,判断低频噪声的主要来源和降低车内低频噪声水平是一个难点。运用声传递向量(ATV)技术,以某轿车为例,建立车内声学空腔边界元模型,对车内低频噪声进行仿真;通过对声传递向量以及声压频响函数的计算,进一步对低频段的噪声贡献量分析,为判断低频噪声的主要来源提供了一种分析方法。选取车内驾驶员右耳畔声压响应的6个峰值点,采用幅值—相位图对场点声压进行模拟,对车身板件声学贡献量进行排序,发现防火墙和前挡风玻璃的结构振动对车内低频噪声的产生可能有重要影响,为进一步的改进提供一定的参考依据。改进设计后,车内低频噪声水平得到一定程度抑制。 相似文献
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在应用声传递向量技术对某商用客车的车内噪声进行板件声学贡献分析的基础上,提出了引入特征频率计权系数和场点权重系数确定多特征频率下对车内综合声场声学贡献量最大的关键车身板件的方法。接着采用中心组合设计通过最小二乘拟合建立了以关键板件振速和1阶模态频率为目标,板件与阻尼层厚度为变量的非线性的响应面模型,通过优化确定了变量的最佳组合。优化方案的实车试验结果显示车内噪声改善效果明显。 相似文献
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以某型客车白车身的试验模型和车门车窗的有限元模型求取结构模态信息,获取结构20~200 Hz的振动速度特性后,建立车内空腔的边界元模型.在LMS Virtual.Lab中计算声学传递向量特性,从而进行车身板件声学贡献分析,得出各板件对车内场点总声压的贡献度,并找出对车内某点声学贡献大的板件.通过实施改进措施,改善了该车车内噪声水平. 相似文献
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针对某客车怠速时出现严重轰鸣现象,采用传递路径分析(TPA)、板贡献量分析(PCA)、模态分析(MA)等方法,找出其原因和主要传递路径;采取有效的共振规避措施,改善整车声品质. 相似文献
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内燃机结构辐射噪声分析技术研究 总被引:2,自引:0,他引:2
建立了“基于BEM理论,利用ATV技术,采用FEM—BEM联合求解策略”的内燃机结构辐射噪声预测分析方法。在内燃机多工况条件下,为结构声辐射问题的快速求解,提供了新的思路和方法。使用该方法,对某型直列6缸柴油机进行了计算机仿真分析。通过试验测试,证明了该方法的科学性、合理性和可行性。 相似文献
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关于ATV的各项技术日益受到行业内相关人士的关注,笔者以中国专利数据库(CPRS)中2012年12月31日以前公开的ATV的专利文献作为样本,对全地形车专利态势进行分析并对专利申请提出建议。 相似文献
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This paper presents a fault detection and diagnosis (FDD) method to enhance the reliability and safety for longitudinal control
of an autonomous all-terrain vehicle (ATV). An integrated approach using decentralized and centralized FDD is proposed to
optimize the tradeoff between sensitivity and robustness. While the decentralized approach is suitable for detecting faults
in actuators and sensors directly connected to a single processor, it is sensitive to noises and disturbances and thus may
result in false alarms. On the other hand, the centralized approach is based on information communicated between multiple
processors, and it detects and diagnoses faults through analyzing concurrent computations of multiple hardware modules. However,
its performance is still limited to isolating faults specifically in terms of components in the single hardware. To incorporate
the advantages of both FDD approaches, a two-layered structure integrating both decentralized and centralized FDD is proposed
and allows us to perform more robust fault detection as well as more detailed fault isolation. Finally, the proposed method
is validated experimentally via field tests of an ATV. 相似文献
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G. N. Wilson A. Ramirez-Serrano Q. Sun 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2017,55(2):168-190
Advanced empirical, and physical-based tyre models have proven to be accurate for simulating tyre dynamics; however, these tyre models typically require expensive and intensive tyre parameterisation. Recent research into wheeled unmanned ground vehicles requiring vertical force analysis has shown good results using a simple linear spring model for the tyre which demonstrate the continued use for simple tyre models; however, parameterisation of the tyre still remains a challenge when load test equipment is not available. This paper presents a cost-effective tyre vertical stiffness parameterisation procedure using only measured tyre geometry and air pressure for applications where high-fidelity tyre models are unnecessary. Vertical forces calculated through an air volume optimisation approach are used to estimate tyre vertical stiffness. Nine tyres from the literature are compared to evaluate the performance of the vertical force estimation and stiffness parameterisation algorithms. Experimental results on a pair of ATV tyres are also presented. 相似文献
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目前我国全地形车行业面临新的机遇和挑战,产品开发与市场开拓工作对企业的发展起着关键作用.为了行业的健康发展,一方面,政府部门和行业机构应不断研究新情况,对产业进行正确引导;另一方面,各企业特别是行业骨干企业,应当重视对行业发展的研究,实施各自的产品开发与市场开拓战略. 相似文献
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Interior sound field refinement of a passenger car using modified panel acoustic contribution analysis 总被引:3,自引:0,他引:3
Panel acoustic contribution analysis (PACA) is a practical engineering tool for the reduction of interior structure-borne
noise in passenger cars. In this study, the current PACA method has been improved for sound field refinement of the entire
interior. Two new parameters, the “acoustic contribution sum” and the “total sound field contribution”, are introduced to
analyze the interior sound field characterized with multiple field points and sound pressure peaks, and to evaluate the integrated
acoustic contributions of auto body panels. In addition, a systematic methodology for automotive interior sound field refinement
is also proposed on the basis of the modified PACA method. An example of a passenger car model demonstrates the application
of the sound-field-refinement methodology and shows the advantage of using damping layers at optimum locations on the auto
body. The example also shows that the modified PACA method has practical significance for refining the interior sound field
and decreasing added mass in accord with the trend towards lightweight auto bodies. 相似文献