SU932326A1 - Rotor moment of inertia determination method - Google Patents

Description

The invention is an ognosigs for measurement technology and can be used to determine the moments of inertia. There is a known method for determining the moment of inertia of a body from the movement of the system under the simultaneous action of two weights (l prc which to one end of the thread pulled onto the machine cylinder and passed through the block located on the right side of the cylinder hang the load R, and to the other end of this thread passed through a block located on the other side of the cylinder, weight the load P and determine the time of lowering the larger load (or raising the smaller one) by distance 1i, change the values of the loads so that the total weight of the loads remains The time of movement of loads for the distance b is determined and again concluded on the magnitude of the moment of inertia fl. The disadvantage of this method is the insufficient accuracy and complexity of the device implementing the method.The method of determining the moment of inertia of the rotor is also known by the intention of the time of movement under the action of loads, which are self-inflamed on the rotor with the help of a thread (2) which is attached to a thread wound on the rotor with a weight U and measure the time of the load falling on the rake (the load ii, measure the weight for the weight P, and There is a conclusion about the magnitude of the moment of inertia 2}. Insufficiency: this method is insufficient accuracy due to pressure change in the support. The purpose of the invention is to improve accuracy. This goal is achieved by the fact that in the method for determining the rotor inertia moment by measuring the time of movement under the action of loads alternately fixed to the rotor with the help of a thread, the loads are chosen the same, fixed them at different radii, and the time of movement is fixed at the same angular velocity rotor.

The drawing shows a device for implementing the method.

The device comprises a rotor I in the form of a cylinder, to which the weight 2 is attached with the help of the thread 3. The method is performed in the following order.

When first measured on tsilnnar 1 radius. winding the thread 3, to the end of which a load 2 of weight P is attached, and the time t of the steps P of the load P to the height of point n is determined. The time value, at the moment of fixing the time of fall -fe-f, is determined by the angular velocity III of the rotation of the cylinder 1.

For the second measurement, the filament 3 is wound on PI of NIR 4 with a radius of G, the fall time -fe of the load 2 of weight P at height ii2 is determined, and the height is chosen such that at the moment of fixation of time t, the angular velocity UU / i equals L).

The same weight of the load when performing measurements ensures in both measurements the constancy of the component moments of the friction forces depending on the train in the supports, and the equality of the angular skortiya at the end of the measurements - the constancy of the average values of the component moments of the friction forces depending on the angular speed. Due to this, the accuracy of determining the moment of inertia is improved.

Claims (2)

1.Gernet M.M., Ratobylsky V.F. Definition of e-yertia moments. M., Mechanical Engineering, 1969, p. 149-153. 2.Gernet M.M., Ratobylsky V.F. Definition of moments of energy. M., Mechanical Engineering, 1969, p. 144-145 (prototype).