GoodToKnow ErgonomicsAnalysis SmartPosturingEngine
EWD computes automatically the forces and torques applied to the hand when interacting with an object or using a tool.
1. Object weight:
The hand forces due to the object weight depend on the action in the phrase and also the position of one or two hands with respect to the object center of gravity (CoG). For instance, if an object is held by one hand from the side a force and a torque due to the gravitational force is applied to the hand. If the object is held on the side by both hands the forces are distributed according to the hand proximity to the object CoG.
The hand force also depends on the action. See the following post:
2. Tool Loads:
The forces and torques applied to the hand when holding the tools depend also on the action. For instance, if the action is to "hold" a tool only the weight of the tools is considered. However, if the action is to "screw" the equations consider two additional information: The typical working torque of the tool and the typical feed force applied to the tool to keep the screw in place while the tool operates. This along with the tool geometry, the tool position/orientation (pose) in space, and its weight allow computing automatically the forces and torques applied to the hand when a tool is involved.
