基于车内NVH控制的悬置刚度与阻尼的设计方法
Determination of Dynamic Stiffness and Damping of Mounts in a Powertrain Mounting System Based on the Requirement of NVH in Vehicle Level

基于汽车座椅滑槽的振动与驾驶员右耳旁噪声控制的要求和建立的由动力总成、车身和非簧载质量组成的13自由度汽车模型，提出了动力总成悬置动刚度和阻尼的设计方法。在计算模型中，将悬置的动刚度和阻尼简化为与激振频率相关的函数。各悬置与车身连接点的动态力、各悬置到汽车座椅滑槽振动与驾驶员右耳旁噪声的传递函数可以通过试验或计算方法得到。给出了在不同工况下，车内评价点的振动和噪声的计算方法。基于对整车振动和噪声控制的要求，给出了液阻悬置动刚度和阻尼的确定原则与计算方法。结果表明，基于车身评价点振动控制要求的液阻悬置阻尼设计对于降低车身评价点的振动具有明显作用。
A method for determining the dynamic stiffness and damping of mounts in a powertrain mounting 〖HJ4.5p system (PMS) is developed based on the limitation requirements for the vibrations of a seat track, and the noise at the driver′s ear on the right side. A calculated model with 13 degrees of freedom (DOFs) is proposed that includes 6 DOFs for the powertrain, 3 DOFs for the car body and 4 DOFs for the four unsprung masses. In the model, the stiffness and damping of a mount are simplified as a function of excitation frequency. The vibration transfer function (VTF) or noise transfer function (NTF) from the connecting point of mount and body to the vibration of seat track, and the noise at the driver′s ear on the right side, can be measured and calculated. The vibration or noise of the interested points is estimated under different driving conditions.