A method and device for on-line measuring the moment of inertia of a rotating body

Abstract

The invention relates to a method and device for measuring the rotation inertia of a revolution body online, and belongs to the field of mechanical properties. The revolution body to be tested is connected with a measurement device; a first standard inertia disc is installed, a time synchronous control system performs control, a first time faller experiment starts to be executed and a data acquisition system records displacement data; a second standard inertia disc is replaced, the time synchronous control system performs control, a second time faller experiment starts to be executed, and the data acquisition system records the displacement data again; the angular accelerations at the same speed time are respectively calculated according to the displacement data obtained two times, and therefore the rotation inertia of the revolution body can be obtained. The affect on the measurement result of speed and load factors in the faller method is avoided, and the measurement repeatability and precision are improved.

Description

technical field [0001] The invention relates to the field of mechanical properties, in particular to a method and device for online testing of the moment of inertia of a revolving body, which is suitable for measuring the moment of inertia of a revolving body that is inconvenient to disassemble from the working environment or has been assembled. Background technique [0002] In precision instruments, engineering machinery, weapon systems, aerospace and other fields, the moment of inertia is an important parameter that affects the working characteristics of components and systems. The moment of inertia is the measure of the inertia of a rigid body in rotation, and it is related to the total mass, shape and position of the rotating shaft of the rigid body. For rigid bodies or rotary systems with complex shapes such as engine crankshafts and automobile clutches, it is very difficult to calculate their moments of inertia mathematically, so experimental methods are often used to ...

AI Technical Summary

Problems solved by technology

It can be seen that the traditional falling method directly regards the resistance torque as a constant value and needs to be improved

[0015] (2) The measurement system and the control system of the traditional falling method are not synchronized, and the repeatability of multiple measurements is not high

[0016] (3) The angular acceleration value used in the calculation of inertia by the traditional falling body method is the average value of the acceleration of several time periods, but the lengths of the several time periods taken are not the same, and the falling process is not uniformly accelerated due to the existence of resistance, so the above The average value of acceleration does not have a clear physical meaning, and its corresponding velocity value is also inconsistent with the actual

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