Methodological approach and co-simulation for the prediction and biomechanical optimization of human-machine interaction during activities with electric hand tools

计划中的研究项目的目的是为评估电动工具在不同电动工具应用中的使用过程中的人体压力建立一个系统的程序和一个联合模拟。这将通过在产品开发的早期阶段评估颠覆性设计变化的影响，考虑由此产生的人类压力，从而在未来实现电动工具的人体工程学优化设计。已经存在基于产品和应用边界条件来模拟用户的姿势和由此产生的肌肉骨骼压力的方法。它们使用模拟环境，可以预测使用中产品的真实用户姿势，以及可以根据给定姿势和外力负荷预测肌肉骨骼应力的环境。因此，在现有技术中存在姿势和应变预测的方法，但这些方法不能直接适用于涉及电动手工具的活动。对于联合仿真，使用现有的模型方法将其扩展到使用电动手工具的活动。该方法将使用示例系统锤子钻机来开发。锤子钻系统特别适合，因为一方面，它对使用者造成高水平的压力，并在广泛的应用中使用，另一方面，它的(准)静态态度使其对于该方法的开发来说是可管理的复杂性。该项目的结果是一种方法和联合模拟，用于预测用户在应用期间与新设计的产品交互时最可能采取的姿势，以及基于生物力学模拟预测用户的应力。

The aim of the planned research project is to establish a methodical procedure and a co-simulation for the assessment of human stress during the use of power tools in different power tool applications. This will enable the ergonomically optimized design of power tools in the future by assessing the impact of disruptive design changes at an early stage of product development, considering the resulting human stress. Approaches already exist for simulating postures and the resulting musculoskeletal stresses on the user based on product and application boundary conditions. These use simulation environments that can predict realistic user posture with the product in use, as well as environments that can predict musculoskeletal stresses from the given posture and loading from external forces. Thus, approaches to posture and strain prediction exist in the state of the art, but these are not directly applicable to activities involving electric hand tools. For the co-simulation, existing model approaches are used to extend them for activities with electric hand tools. The method will be developed using the example system hammer drill. The hammer drill system is particularly suitable because, on the one hand, it causes a high level of stress for the user and is used in a wide range of applications and, on the other hand, its (quasi-)static attitude makes it a manageable complexity for the development of the method. The result of the project is a method and co-simulation for predicting the postures most likely to be assumed by the user in interaction with a newly designed product during an application, as well as the prediction of the user's stress on the basis of a biomechanical simulation.