共查询到20条相似文献,搜索用时 400 毫秒
1.
2.
3.
4.
5.
6.
7.
某纯电动样车在试验过程中被抱怨驱动电机噪声问题。针对该问题,首先进行永磁同步驱动电机的振动噪音机理分析,建立以转速为输入信号和以噪声频率与阶次为输出信号的电机振动噪声理论模型,并推导出A声级噪声理论谱线;其次,进行被测永磁同步的电机振动噪声测试,得出A声级噪声试验谱线;最后,对比理论模型预测和测试结果,验证了模型的正确性,并识别被测永磁同步电机异常噪声源。该模型与试验相结合可以快速识别永磁同步电机的异常振动噪声源。 相似文献
8.
9.
10.
11.
为了在设计阶段保证整车的NVH性能,通过搭建虚拟路面仿真平台探究轮胎关键物理参数对于整车路面振动噪声的影响规律。结合实车采集的试验场NVH路面PSD、高精度物理轮胎CDTire模型以及整车声固耦合模型,建立完整的整车路噪仿真环境。通过某款SUV的仿真结果表明,不同款轮胎及同款轮胎不同批次对整车路面振动噪声有直接的影响。虚拟路面方法可以在整车开发早期甄别出在车辆噪声中起主导作用的频率段,从而排查明显的NVH设计缺陷,同时,可以为车型NVH正向开发提供轮胎选型依据。 相似文献
12.
13.
传递路径分析法是诊断汽车振动噪声问题准确有效的方法。试验传递路径分析耗时耗力且需要实制样车,为在整车开发初期诊断汽车振动噪声问题,对整车虚拟传递路径分析法进行了研究。首先建立了包含底盘的整车声固耦合有限元模型,采用频率响应法预测车内声学振动响应,发现驾驶员右耳声压在38 Hz处以及驾驶员座椅导轨振动在59 Hz处存在较大峰值。在有限元模型基础上建立了整车虚拟传递路径分析模型,该模型合成的声学振动结果与频率响应法结果吻合较好,验证了模型的正确性。利用虚拟传递路径法对两处峰值作诊断分析,根据分析结果对贡献量大的路径进行优化。优化结果表明,38 Hz处驾驶员右耳声压降低2 dB,59 Hz处座椅振动改善效果明显。 相似文献
14.
48VBSG混合动力系统控制策略开发及试验研究 总被引:5,自引:0,他引:5
传统内燃机结合48V BSG电机的弱混合动力系统是应对未来油耗法规的一种高性价比方案,其节油效果明显、成本低、开发难度小.为研究48V BSG混合动力系统对于现有车辆性能的改善效果,对一台量产SUV进行了改造,在原有的发动机上加装了48V BSG电机系统,实现了加速助力、能量回收、发动机高速起动等混合动力功能.在该车上,对上述混合动力功能的控制策略进行了研究与优化,并进行试验验证.改造前后的N EDC循环测试表明,该系统能够降低燃油消耗9.1%、THC排放34.3%、NMHC排放35.4%、NOx排放60.6%,并能大幅降低车辆起动的振动噪声水平,提升车辆动力性. 相似文献
15.
16.
用于车内减振降噪的智能材料和结构的研究 总被引:10,自引:0,他引:10
随着国内外对智能材料和结构研究的日益深入,这一高新技术在汽车工业中的应用前景显示越来越广阔,分析了汽车车内噪声产生的机理,认为利用智能结构进行车内噪声控制主要从三个方面入手:一是消除噪声源;二是隔绝振源与车身之间的振动传递关系,阻断固体传播;三是进行车身振动的主动控制,通过减少振动来消除噪声,对智能材料和结构在汽车减振降噪领域的应用作了探讨和展望。 相似文献
17.
在介绍混合动力电动汽车结构和工作特性的基础上,分析了混合动力电动汽车由于动力源增加、驱动桥改变和工作模式不同,导致其振动和噪声相对于传统内燃机汽车发生了较大改变,并针对这些改变归纳和提出了减振降噪的技术。 相似文献
18.
S. J. Kim S. G. Kim K. S. Oh S. K. Lee 《International Journal of Automotive Technology》2008,9(6):703-711
The excitation force of a powertrain is one of major sources of interior noise in a vehicle. This paper presents a novel approach
to predict the interior noise caused by the vibration of the powertrain by using the hybrid TPA (transfer path analysis) method.
Although the traditional transfer path analysis (TPA) is useful for the identification of powertrain noise sources, it is
difficult to modify the structure of a powertrain by using experiments for the reduction of vibration and noise. In order
to solve this problem, the vibration of the powertrain in a vehicle is numerically analyzed by using the finite element method
(FEM). The vibration of the other parts of the vehicle is investigated by using experiments based on vibrato-acoustic transfer
function (VATF) analysis. These two methods are combined for the prediction of interior noise caused by a powertrain. Throughout
this research, two papers are presented. This paper presents a simulation of the excitation force of the powertrain exciting
the vehicle body based on numerical simulation. The other paper presents a prediction of interior noise based on the hybrid
TPA, which uses the VATF of the car body and the excitation force predicted in this paper. 相似文献
19.
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(4):405-428
A hybrid hydraulic vehicle (HHV) combines a hydraulic sub-system with the conventional drivetrain in order to improve fuel economy for heavy vehicles. The added hydraulic module manages the storage and release of fluid power necessary to assist the motion of the vehicle. The power collected by a pump/motor (P/M) from the regenerative braking phase is stored in a high-pressure accumulator and then released by the P/M to the driveshaft during the acceleration phase. This technology is effective in significantly improving fuel-economy for heavy-class vehicles with frequent stop-and-go drive schedules. Despite improved fuel economy and higher vehicle acceleration, noise and vibrations are one of the main problems of these vehicles. The dual function P/Ms are the main source of noise and vibration in a HHV. This study investigates the dynamics of a P/M and particularly the profile and frequency-dependence of the dynamic forces generated by a bent-axis P/M unit. To this end, the fluid dynamics side of the problem has been simplified for investigating the system from a dynamics perspective. A mathematical model of a bent axis P/M has been developed to investigate the cause of vibration and noise in HHVs. The forces are calculated in time and frequency domains. The results of this work can be used to study the vibration response of the chassis and to design effective vibration isolation systems for HHVs. 相似文献
20.
K. Jeon H. Hwang S. Choi J. Kim K. Jang K. Yi 《International Journal of Automotive Technology》2012,13(2):247-253
Cornering maneuvers with reduced body roll and without loss in comfort are leading requirements for car manufacturers. An
electric active roll control (ARC) system controls body roll angle with motor-driven actuators installed in the centers of
the front and rear stabilizer bars. A vehicle analysis model developed using a CarSim S/W was validated using vehicle test
data. Two ARC algorithms for a sports utility vehicle (SUV) were designed using a sliding-mode control algorithm based on
a nonlinear roll model and an estimated lateral acceleration based on a linearized roll model. Co-simulation with the Matlab
simulink controller model and the CarSim vehicle model were conducted to evaluate the performance of two ARC control algorithms.
To validate the ARC performance in a real vehicle, vehicle tests were conducted at KATECH proving ground using a small SUV
equipped with two ARC actuators, upper and lower controllers and a few subsystems. From the simulation and vehicle validation
test results, the proposed ARC control algorithm for the developed ARC actuator prototypes improves the vehicle’s dynamic
performance. 相似文献