Electric motor and transmission coupled vibro-acoustics of electric powertrains

电动动力系统的电动机和变速器耦合振动声学

• 批准号: 2585407
• 金额: --
• 依托单位: Loughborough University
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2585407
• 关键词: Electric; motor; transmission; coupled; vibro

The UK is at the forefront of utilising zero-emission (electric) vehicles (EVs) in a large scale, since the sale of new internal combustion engine driven cars and vans is planned to end by 2030 according to recent government announcements. Opposing to the prevalent views, the powertrains of EVs are not silent.The generated noises (from the electric motor and the drivetrain) during the EV operation (predominantly at medium to high speeds) are amplified by the lack of masking noise from the internal combustion engine. Thus, Automotive OEMs will have to quickly adapt their Noise, Vibration and Harshness (NVH) design approaches to the new challenges imposed by electric powertrains.The most prominent NVH issues in Evs are the tonal noises radiated from the electric motor (at harmonics of the rotor speed, namely whistling noise) and from the mechanical transmission (at harmonics of the gear meshing frequency, namely whining noise). In the former, the electric motor electromagnetic force plays a key role, exciting the structure, amplified by the reduced size (and weight) of the motor. In the latter, the torque variation reaching the transmission combined with system misalignments (in gears, shafts and the housing) ae exciting the drivetrain, leading to gear meshing oscillations.The above NVH issues are often amplified by the wide range of EV operating conditions and high power transmitted, which introduces instabilities in the coupled system dynamics (between the electric motor and the transmission). A coupled multiphysics investigation involving whistling and whining NVH requires the simultaneous consideration of various disciplines, such as electromagnetics, component flexibility, transient dynamics and noise generation. The aim is to identify the principal root-causes behind the above NVH behaviour. As a result, novel design solutions will be proposed to reduce the powertrain NVH severity in EVs early in the development process.The research will focus on the following aspects: i) the coupling between the e-motor and transmission transient dynamics and ii) novel reduced-order methods to simulate the above NVH behaviour.

英国在大规模使用零排放（电动）汽车（ev）方面走在前列，因为根据政府最近的公告，新的内燃机驱动的汽车和货车计划到2030年停止销售。与流行的观点相反，电动汽车的动力系统并不是无声的。电动汽车在行驶过程中（主要是在中高速行驶时）产生的噪音（来自电动机和传动系统）由于缺乏内燃机的掩蔽噪声而被放大。因此，汽车oem厂商必须迅速调整其噪声、振动和粗糙度（NVH）设计方法，以应对电动动力系统带来的新挑战。电动汽车中最突出的NVH问题是电动机（转子转速谐波，即啸叫噪声）和机械传动（齿轮啮合频率谐波，即啸叫噪声）发出的音调噪声。在前者中，电动机的电磁力起着关键作用，它刺激结构，并因电动机尺寸（和重量）的减小而放大。在后者中，到达变速器的扭矩变化与系统错位（齿轮，轴和外壳）相结合，激励了传动系统，导致齿轮啮合振荡。上述NVH问题通常会因电动汽车的广泛工作条件和高功率传输而被放大，这在耦合系统动力学（电动机和变速器之间）中引入了不稳定性。涉及呼啸声和呜呜声NVH的耦合多物理场研究需要同时考虑多个学科，如电磁学、组件灵活性、瞬态动力学和噪声产生。目的是确定上述NVH行为背后的主要根本原因。因此，在开发过程的早期，将提出新颖的设计解决方案，以降低电动汽车动力总成NVH的严重程度。研究将集中在以下几个方面：1)电动机和变速器瞬态动力学之间的耦合；2)模拟上述NVH行为的新颖降阶方法。