SU1239536A1 - Method of static balancing of rotor on elastic suspension - Google Patents

Description

The invention relates to a measuring equipment and can be used to determine the imbalance of the rotors of angular accelerometers during their static balancing.

The purpose of the invention is to improve the accuracy of the rotor's alansirovation, fixed on the gesture of an elastic suspension, which ensures the performance of the angular accelerometer of severe conditions of operation.

Improved balancing accuracy is ensured by compensating the stiffness of the elastic torsion suspension.

FIG. 1 shows a structural diagram of an installation for implementing the proposed method; on fng. 2 - rotor corner angle. lerometer on an elastic suspension, option; in fig. 3 - graphs of the output nagf of the transducer of displacement of the rotor of the boosable angular accelerometer with smooth rotation of the device in a horizontal position, the scientific research institute of the axis of the elastic suspension of the rotor.

The proposed method is carried out using a test unit (Fig. 1), which contains a rotary device 1, a mandrel 2 for fastening the accelerometer 3, in the case of which a rotor 5, an angular displacement transducer 6, an amplitude-adjustable generator 7 are mounted on elastic suspensions 4 output signal and the recorder 8 output signal from the displacement transducer.

In addition, the rotor 5 of the angular accelerometer with the movable element 9 of the converting transducer 9, the fixed elements 10 of the angular displacement transducer, the gap S between the elements of the displacement transducer are indicated (Fig. 2).

The balancing of the rotor of the angular accelerometer is performed as follows.

The balanced accelerometer is installed with the help of a rotating device in a position in which the axis of the elastic suspension of the rotor is vertical (Fig. I Q).

The moment of resistance to torsion of the elastic suspension is compensated by the moment of interaction forces between the movable and non-movable elements of the angular displacement transducer. The counteracting moment of resistance of the elastic suspension is compensated as long as, when a moment equal to the required unbalance of the rotor is applied to the rotor, the output of the transducer is displaced with a signal sufficient for recording with existing means. The moment is applied to the rotor by means of a torque sensor present in the accelerometer, and in the case of its absence it is applied by an application

2395361

a known force at a certain distance from the axis of rotation of the rotor.

To create a normalized force applied to the rotor at a certain distance

J standing from its axis of rotation, it is possible, for example, to use a stream of air exiting the nozzle. The force created by the air stream is predetermined depending on the air pressure and the distance from the nozzle,

0 from which air comes out, to a place on the rotor, on which the stream of air gets. The magnitude of the compensating moment is controlled by changing the voltage of the capacitive or inductive converter.

f J of the displacement supplied to the fixed elements from the generator with an adjustable amplitude of the output signal, as well as a change in the gap between the elements 1frame and the displacement body. As stationary elements, both regular displacement transducer elements and special elements that allow for frequency response of a large amplitude signal to them can be used. The balancing accelerometer sets 25 s using a rotating device to a position in which the axis of the elastic suspension of the rotor is horizontal (Fig. IS) and smoothly rotates around the axis ynpjToro of the suspension within 360 °.

thirty

I

35

40

45

When the rotor rotates; -a within the angle V О-ЗБО in the presence of its unbalance at the output of the displacement transducer, the Ovyh signal depends on the angular position of the rotor (Fig. 3).

The amplitude and phase of the output signal from a capacitive or inductive displacement transducer determine the magnitude and angular coordinate of the unbalance of the rotor, which is removed by any known methods.,

The presence of Omax min indicates the imbalance of the rotor, and the ratio of imax Udop and UMHH - additional - about the imbalance of the permissible value; angles 3, and 3, define the angle

the coordinate of the rotor imbalance.

By successively removing the imbalance by any known method and turning the accelerometer or the sensing element within an angle of 0-360 °, it is achieved that UMSKC and become smaller + idop and - Cdop, respectively.

Obtaining this ratio indicates that the unbalance of the rotor does not exceed the allowable Mneb Mdop, and the balancing process is over.

Since the proposed method allows for precision balancing,

Initially, the rotor must be balanced in any known manner to a value of NOH cm.

When the supply voltage of a capacitive or inductive transducer of rotor movement of a balanced angular accelerometer from a generator with adjustable output amplitude directly to stationary elements of the transducer is applied, the characteristic of the negative rigidity generated will be nonlinear, while the characteristic of the elastic suspension of the rotor is linear. Therefore, in the case of a distorted signal at the output of a converter, the signal is distorted when the rotor is rotated within 360 ° around the axis of rotation of the elastic suspension at

; Talnoe his position, you need an axis

 the elastic suspension and the axis of rotation of the rotator are set at such an angle to the horizon that the waveform is close to sinusoidal. After the rotor is balanced, the angle of inclination of the axis of the elastic suspension and the axis of rotation of the bending device to the horizon is reduced and the rotor is balanced again by the proposed method. The final balancing of the rotor is carried out with the horizontal position of the axis of the elastic suspension and the axis of rotation of the rotator. If the creation of a negative rigidity is carried out in accordance with the known, then the proposed method is realized by rotating the balancing accelerometer from the position (fig. 1 q) directly into the polo; life (Fig. IS).

v.

1

Elastic axis

suspension 5

Editor N. Dumbass

Compiled by A. Trunov,. .

Tehred I.Popovich Proofreader O. Lugova

Order 3386/40. Circulation 778 Subscription

VNSh1PI USSR State Koltot

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Printing and printing enterprise, Uzhgorod, st. Project, 4

Fig2

FIG.

Claims (1)

METHOD FOR STATIC BALANCING OF A ROTOR ON AN ELASTIC SUSPENSION, which consists in rotating the rotor around an axis of elastic suspension located horizontally and determining the magnitude and angular coordinate of the imbalance by the magnitude and phase of the output signal from the rotor angular displacement transducer, characterized in that, in order to improve the accuracy of balancing , before determining the imbalance of the rotor, it is installed vertically by the axis of the elastic suspension and compensate for the opposing moment of torsion resistance elastically suspension of torque forces between the movable and fixed elements inverter angular movement to the value required imbalance.