Paddan G S, Griffin M J
Institute of Sound and Vibration Research, The University, Southampton, U.K.
J Biomech. 1988;21(3):191-7. doi: 10.1016/0021-9290(88)90169-8.
Vibration in the three translational (fore-and-aft, lateral and vertical) and the three rotational (roll, pitch and yaw) axes of the head has been measured during exposure to whole-body random vibration. Using an instrumented bar gripped between the teeth, the influence of variations in bite grip and bite-bar mass on movements of the head were found to be small up to a mass of 375 g. The repeatability of measures of seat-to-head transmissibility within a single subject and the variability in transmissibility across a group of twelve subjects have been determined with two seating conditions: a rigid seat with a backrest and the same seat with no backrest. Seat-to-head transmissibilities associated with vertical seat vibration are presented at frequencies up to 25 Hz for all six axes of head vibration both with and without a backrest. Head motion occurred principally in the fore-and-aft, vertical and pitch axes of the head. The backrest increased the magnitude of head vibration in most cases. Intra-subject variability was generally small compared to inter-subject variability.
在全身随机振动暴露期间，测量了头部在三个平移轴（前后、横向和垂直）和三个旋转轴（横滚、俯仰和偏航）上的振动。使用夹在牙齿之间的仪器杆，发现咬合力和咬杆质量的变化对头部运动的影响在质量达到375克之前很小。在两种座椅条件下，确定了单个受试者内座椅到头部传递率测量的重复性以及一组12名受试者之间传递率的变异性：一种是带靠背的刚性座椅，另一种是不带靠背的相同座椅。给出了在有靠背和无靠背两种情况下，与垂直座椅振动相关的座椅到头部传递率在高达25Hz的频率下针对头部振动的所有六个轴的情况。头部运动主要发生在头部的前后、垂直和俯仰轴上。在大多数情况下，靠背增加了头部振动的幅度。与受试者间变异性相比，受试者内变异性通常较小。
