A novel optimization technique was implemented to investigate the effects of vibrations on comfort of occupants to maintain oscillations in an acceptable zone in accordance with the International Organization for Standardization 2631 standard. In this regard, a newly introduced comfort indicator was defined as discomfort criterion (DiC). The effectiveness of the proposed measure was investigated throughout the suspension optimization of an in-wheel motor electric vehicle which almost doubled the unsprung mass by adding an electric motor to the wheel assembly. First, a spatial oscillatory model of the electric vehicle with eight degrees of freedom was developed, and the linear quadratic regulator control scheme is selected to control an actuator in an active suspension. Road excitations were then generated by applying the power spectral density of road class B–C provided by the International Organization for Standardization 8608 standard. The exceedance from the reduced comfort limit (in accordance with the International Organization for Standardization 2631 standard) and wheel travel (WT) of the vehicle were considered as design objectives. Finally, using a novel optimization procedure, the optimum condition and impact factor of the design variables, as well as counterplots of the design objectives with respect to the effective design parameters, were extracted and analyzed. Results proved the proposed indicator, that is, discomfort criterion (DiC) as a reliable measure to assess suspension systems’ performance effectively.

根据国际标准化组织2631标准，采用了一种新颖的优化技术来研究振动对乘员舒适度的影响，以将振动维持在可接受的范围内。在这方面，新引入的舒适度指标被定义为不适标准（DiC）。在整个轮毂电机电动汽车的悬架优化过程中，研究了拟议措施的有效性，通过在轮毂组件上增加电机，使未悬挂弹簧的质量几乎翻了一番。首先，开发了具有八个自由度的电动汽车的空间振动模型，并选择了线性二次调节器控制方案来控制主动悬架中的执行器。然后通过应用国际标准化组织8608标准提供的B-C级道路的功率谱密度来产生道路激励。降低的舒适度限制（根据国际标准化组织2631标准）和车辆的车轮行驶距离（WT）被视为设计目标。最后，使用新颖的优化程序，提取并分析了设计变量的最佳条件和影响因子，以及与有效设计参数有关的设计目标。结果证明了拟议的指标，即不适标准（DiC）作为有效评估悬架系统性能的可靠措施。