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文章主要针对玻璃升降过程中由内水切造成的异响问题进行分析研究,介绍了内水切异响类型和相关设计要点。结合物理模型和振动微分方程分析其异响机理,总结出异响控制的3种方式。最后运用DFSS方法识别异响机会,根据客户要求定义工程指标,通过优化自身变量确定控制因子和噪音因子,利用有限元分析得到水切拔出力,分析其信噪比找到消除异响的稳健设计方案,并通过实车验证其方案有效。 相似文献
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玻璃升降系统是整车车身系统中最大和最复杂的附件系统,其性能的好坏对整车的舒适性、NVH (Noise Vibration Harshness,噪声、振动、声振粗糙度)等起着重要的作用.针对整车玻璃升降系统异响问题,提出玻璃升降过程中Y向偏移量对异响问题影响的研究思路,从摩擦学角度对升降系统的振动异响原因进行分析,确定车门钣金焊接工艺的优化与内水切绒毛改善方案,改善了玻璃升降过程中Y向偏移量大的问题并调整优化了摩擦系数等,使玻璃升降系统异响的故障率从50.8%降至0. 相似文献
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在新车型设计匹配过程中,经常出现变速器异响的问题,而响声通常是难以分析的,本文论述了变速器异响的分类及原因分析,并就动力输入引起的异响案例进行了分析。 相似文献
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汽车异响为整车常见的抱怨,排气歧管异响一般较少见,但在某排气歧管开发过程中,某1.5L AT整车在加速过程中出现一种很清脆的"沙沙"声,属于高频范围。经过噪声排查测试,该异响是由于歧管的流道过短、设计不合理而产生。通过对比四种不同结构的排气岐管的噪声测试结果,发现歧管设计中应该避免歧管出口流道设计过短,各流道长至少在150mm以上,并应达到完全隔离的状态,避免各缸之间气流的相互干涉而产生异响噪声。 相似文献
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文章介绍了在汽车仪表板横梁设计开发过程中,材料选择、横梁主副管梁及其他安装支架等结构设计的重要参数。针对车辆在路试时常出现的异响问题,在设计过程中考虑仪表板横梁的模态,避让发动机怠速工况的固有频率与仪表板横梁模态频率相近产生共振异响,通过计算机辅助工程(CAE)软件分析某汽车仪表板横梁总成模态,并结合公司内部相关标准,得出设计的横梁满足设计要求,避免后续因异响问题产生横梁的修模费用,旨在为后续同类结构设计提供参考。 相似文献
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玻璃升降器的升降基准线对指导车门导槽、车门玻璃、车门玻璃密封条的设计以及玻璃升降器系统玻璃升降的平稳性起到重要作用。本文着重介绍了玻璃升降基准线的设计方法,并简要介绍了该设计方法产生的原理。 相似文献
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基于仿真分析的轿车门框密封条装配结构改进研究 总被引:1,自引:0,他引:1
借助MARC有限元分析方法,对某款具有代表性的单泡管型门框密封条进行插拔变形和弯曲变形模拟分析.根据变形过程和仿真结果,确定原设计存在装配困难、容易脱落及弯曲塌陷等问题,并提出相应的改进方案.通过计算机仿真、零件性能测试和装车效果评价相结合的方法,验证了装配结构改进后的门框密封条在插拔性能和弯曲性能上均能满足设计要求. 相似文献
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介绍了车门设计的方法和过程,包括内外板、门锁、铰链布置、运动校核、玻璃升降器布置、车门玻璃的设计。通过对设计过程的介绍,阐述了基于设计硬点和主断面的车门设计思路。 相似文献
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车门密封条是汽车车门的重要组成部件之一。文章介绍了车门密封条的种类与材料的选择,研究了玻璃导槽、内水切、外水切、门密封条及门槛条等车门密封条的典型断面结构,分析了这些断面的不同功能与设计准则,展示了密封条的微观结构与配合关系。最后得出结论:断面设计是密封条设计的关键,直接影响密封条的性能,同时为后续的密封条设计开发提供参考与支持。 相似文献
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在车企总装车间车身装配过程中,内饰线、底盘线、总装线、四轮定位、返修各工段都有各自的失效模式,如果发生质量问题,就会导致花费大量时间检查,影响生产效率。文章结合车辆在路试过程中的后背门异响实际案例,运用PFMEA工具进行分析,找出导致后背门异响产生的原因,并且在前期的总装车间装配过程中进行工艺优化,在后续的工艺试验验证基础上,解决了后背门在路试过程中产生异响的质量问题,提高了车身稳定性及安全性。 相似文献
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Door glass position errors that occur when an automobile door glass goes up and down not only reduce the basic performance of the door glass in terms of sound- and water-proofing, but also decrease the life span of the glass run and belt. Thus, there is a need for understanding the dynamic behavior of a door glass in order to reduce these errors. In this research, we analyzed the door glass behavior by developing a dynamic numerical analysis model for a single rail regulator type of door glass lifting system. We modeled the glass run and belt lip load as a non-linear spring-damper system to reflect changes in the lip load caused by door glass position errors in the analysis. We also introduced local coordinate systems to find door glass position errors during the lifting process. By using our model, the time spent on the up and down motions, the current, and the lifting resistance could be predicted with 4 %, 11 %, 3 % and 4 % of error, respectively, comparing with the test data. We confirmed the effects of imbalances and boundary conditions in the load and moment which occur during the door glass lifting process. We also found that the lip reaction force, coefficient of friction, overlap length and position of the lift line cause door glass position errors. 相似文献
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W. F. Zhu X. H. Jiang X. Chen P. J. Lin 《International Journal of Automotive Technology》2016,17(5):853-864
Installed between metallic DIW (Door in White) panel and nonmetallic door glass, automotive window seals has great influence on customers’ perception of NVH (Noise-Vibration-Harshness) performance. Recently, aerodynamic effect on ride comfort attracts increasing research interest. The external load causes unsteady pressure on glass, which is finally transferred to window seals and leads to complicated vibration and increases interior noise level. However, non-linearities of hyper-elastic material, rubber-glass contact and large deformation behavior make the construction of window seals constraint model much more difficult, thus impeding further analysis and optimization. A new window seal design method is proposed featuring in considering aerodynamics-induced load and nonlinear constraint. Firstly, by SST ? k ? ε (Shear Stress Transport) turbulence model, external flow field of full-scale automotive is established by solving three-dimensional, steady and uncompressible Navier-Stokes equation. With re-exploited mapping algorithm, the overall aerodynamic pressure is extracted and matched to local window as external loads for seals, thus taking into account high speed fluid-structure interaction. Secondly, based on functional equivalence and mathematical fitting, new surrogate constraint model is presented. The unitedseal CLD (Compression Load Deflection) curve is synthesized after translations and transformations from two semi-seal CLD experimental measurements of inner and outer lips. It is then fit to complex exponential function, making seal constraint equivalent to a surrogate elastic constraint with variable stiffness. Experiment is performed to verify the constraint surrogation effectiveness. Finally, case study of window seal design under high speed is investigated. After seal optimization based on the new method, windows seals’ maximal displacements have decreased. The improved seal-glass fitting status shows better NVH quality of window seal in high-speed condition. 相似文献
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针对声品质主观评价试验成本高的问题,提出一种基于车窗上升过程稳态噪声和瞬态噪声的声品质预测模型。采集24款轿车左前门车窗上升过程的噪声信号,在时域上划分为具有瞬态噪声特征的启动阶段、停止阶段和具有稳态噪声特征的平稳运行阶段,分别计算出3个阶段的客观评价参数。通过主观评价试验得到每款样本车的主观评价结果。运用BP神经网络建立了车窗上升过程的声品质预测模型,预测结果表明,此方法提取的客观评价参数能反映左前门车窗上升过程的声品质特征,BP神经网络建立的声品质预测模型具有较高准确度和泛化能力,能在一定程度上代替评测员对车窗上升过程声品质进行评价。 相似文献