In hand-held human machine systems the biodynamic response of the human hand arm system influences the overall dynamic behavior. The biodynamic response of the hand arm system is affected by several influencing factors. These influencing factors include the feed force, body posture, gripping force, and anthropometric properties. In present studies the importance of the gripping force on the biodynamic response is highlighted. In the state of the art; however, the magnitude of gripping forces as well as the influence of the human factors body posture and feed force on hammer drills for a larger group of professional users is unclear. To analyze the influence that these human factors have on hammer drill vibrations, a study with 15 professional power tool test personnel has been conducted. Characteristic gripping force values have been measured (Median: 84 N–156 N at the main handle, 10 N–30 N on the auxiliary handle) for different feed forces (100 N, 150 N, 200 N) and body postures. Then the influence of body posture, feed force, and gripping force on the hammer drill vibration is determined. A significant influence of the body posture (ANOVA: p = .003, r = .367) on the RMS acceleration of the main handle was observed. Furthermore, the feed force has a significant influence on the vibration of the hammer-drill for some groups. The data also demonstrates that for increasing gripping forces, the RMS of the acceleration and frequency weighted acceleration $a_{hv}$ on the main and auxiliary handle decrease. The findings of this study represent a starting point for the development of adjustable hand-arm models for the reproducible vibration assessment of power tools.

在手持人机系统中，人手手臂系统的生物动力学响应会影响整体动态行为。手臂系统的生物动力学响应受几个影响因素的影响。这些影响因素包括进给力、身体姿势、抓握力和人体测量学特性。在目前的研究中，强调了夹持力对生物动力学响应的重要性。处于最先进的水平；然而，夹持力的大小以及人为因素身体姿势和进给力的影响对更多专业用户使用锤钻的情况尚不清楚。为了分析这些人为因素对锤钻振动的影响，我们对 15 名专业电动工具测试人员进行了研究。已针对不同的进给力（100 N、150 N、200 N）和身体姿势测量了特征夹持力值（中位数：主手柄为 84 N–156 N，辅助手柄为 10 N–30 N）。然后确定体位、进给力和夹持力对锤钻振动的影响。身体姿势的显着影响（方差分析：p  =  .003，r  =  .367) 上观察到主手柄的 RMS 加速度。此外，对于某些组，进给力对锤钻的振动有显着影响。数据还表明，为了增加夹持力，加速度和频率加权加速度的 RMS${\mathrm{一个}}_{\mathrm{小时}v}$上主副手柄减少。这项研究的结果代表了开发用于电动工具可重复振动评估的可调节手臂模型的起点。