Design of a Novel Device for Measuring the Inertia of Helmet

The moment of inertia is an important factor affecting the comfort of the helmet. However, the shape of the helmet has irregular characteristics, so the moment of inertia (MI) is difficult to measure. Therefore, this paper develops a device that accurately measures the MI of the helmet. The device uses the weighing method and the torsion method combined with the lever theory to measure the MI of the irregular helmet. Visual C++ is used as the development environment to create visualization software, which can display and print data. The device can accurately measure the center of gravity and moment of inertia of the helmet without damaging the helmet. It is a new method of measuring MI, and It is simple and reliable.