本项目旨在填补多轴直线振动与角振动联合激励下人体对振动的客观和主观响应研究方面的空白。以高速列车车厢、座椅和乘客为研究对象，以列车特有的多轴直线振动和侧倾振动为切入点，开展高速列车乘坐动力学机理与动态舒适性预测方法研究。一方面，通过坐姿人体动力学试验研究，建立多种坐姿人体模型；研究座椅的动态特性、座椅与乘客系统的传递特性和动态耦合机理，建立“座椅-人”耦合系统的动力学模型；研究高速列车整车动态特性，探究“座椅-人”耦合系统与整车动力学之间的动态耦合关系，建立能够预测乘坐动态响应的“车辆-座椅-人”耦合系统物理模型。另一方面，探究多轴振动条件下坐姿人体舒适性随振动频率、幅值、时长及坐姿等变化的等舒适性曲线及其演化规律，研究人体主观舒适性与客观物理量之间的关联性，建立乘坐振动舒适性的预测模型。最终，基于“车辆-座椅-人”物理模型和舒适性预测模型，指导高速列车乘坐振动舒适性的优化设计。

This project seeks to fill the gap in the research of human responses to vibration subjectively and objectively with multi-axis Whole-Body Vibration. The research, involving the carriage, seats and passengers, will consider combined multi-axis translational and rotational vibrations often encountered in high-speed train. A series of biodynamic tests will be conducted so as to develop biodynamic models of seated human body. Characteristics of train seats and the underlying mechanism of vibration transmission between seats and passengers will be examined, leading to development of coupled models of “seat – human” dynamic system. A dynamic model of a carriage will be developed based on test results of high-speed train and its substructures (bogie and carriage) or based on the existing knowledge and data available. The model of the carriage will be further integrated with the developed “seat-human” dynamic model to form a model of “vehicle-seat-human” coupled dynamic system, making it possible to predict the dynamic responses of seated human body under multi-axis vibrations. In the meantime, a series of subjective studies will be conducted. 2D and 3D equivalent comfort contours of seated human body under multi-axis excitations will be explored. How the comfort contour changes with the vibration frequency, magnitude and durations will be revealed. The relationship between subjective responses and objective measurements will be established to develop a multi-scale predictive model of ride comfort. Based on the developed “vehicle-seat-human” physical model and the multi-scale comfort model, a design method for optimizing the dynamic performance of high-speed train and ride comfort, which can be easily extended to general tracked vehicles, will be recommended.