| 摘要 |
PURPOSE:To measure easily the moment of inertia of an object to be measured by subjecting a horizontal arm of known moment of inertia attached with an object to be measured to free damped oscillation by means of a spring having a known spring constant, and measuring the oscillation frequency thereof. CONSTITUTION:An arm 6 attached with an object A to be measured is turned against a spiral 10 to bring an iron piece 11 opposite to a solenoid 12 for starting. When the operator pushes a start switch 14 of a box 13 of a display device, a solenoid 12 is de-energized, and the arm 6 including the object A performs free damped oscillation. Therefore, a photocoupler 16 detects the pass time of a light shielding plate 15, that is, the oscillation frequency of the arm 6. Said oscillation frequency time is inputted to the box 13, where the result calculated by the microcomputer built therein is displayed directly as the moment of inertia of the object A with a display device 17 of the box 13. The moment of inertia of the implement is thus easily measured as a rational measure for selecting the implement. |
