RU2533748C1 - Method and device for measurement of angular acceleration of controlled object - Google Patents

Abstract

FIELD: measurement equipment.

SUBSTANCE: measurement of duration of time intervals is performed between fronts of all pulses by means of a pulse sensor of angular position; average velocity is determined at each time interval, thus creating reversed relative movement of the parts of the pulse sensor of angular position, which are differently connected to a controlled object, thus providing generation by means of the pulse sensor of maximum number of pulses in an end braking section of the controlled object, and measurement of angular acceleration values is performed at braking. The device includes inertia mass 5, pulse sensor of angular position 2, which is rigidly installed on controlled object 1, recording device 7 and calculator 8, as well as freewheel clutch 6 installed between controlled object 1 and inertia mass 5, which is rigidly fixed on a shaft of optic disc 3 of the pulse sensor of angular position 2, which is represented with a sensor-encoder.

EFFECT: improving accuracy of determination of angular acceleration in an end braking section of the controlled object.

3 cl, 1 dwg

Description

The invention relates to the field of instrumentation and can be used to measure angular acceleration.

A known method of measuring acceleration and a device for measuring acceleration described in AS No. 767658, 1978, IPC G01P 15/08. The method consists in the fact that the position of the object is determined at known time intervals and the speed and acceleration are calculated from them.

A device that implements this method contains LEDs, a pulse generator, and a recorder (film).

The disadvantages of this method and device include the relatively low accuracy of measurements at low speeds and the complexity of processing the results.

The closest and selected as a prototype is the method of measuring angular accelerations described in AS No. 824061, publ. 04/23/1981, IPC G01P 15/08 under the name "Digital shaft acceleration meter", which includes measuring the duration of time intervals between the edges of all pulses of a pulse encoder, determining the average speed at each time interval and the values of angular acceleration. A device that implements this method contains a pulsed angular position sensor (quantizer), a recording device and a computer (implemented on triggers and digital logic elements).

The disadvantages of these technical solutions include the lack of accuracy in calculating the angular acceleration at the final stage of braking of the controlled object (at low speeds and angular displacement).

The aim of this invention is to increase the accuracy of determining angular acceleration in the final section of braking of the controlled object.

This is achieved by the fact that in the method of measuring the angular acceleration of a controlled object, including measuring the duration of time intervals between the edges of all pulses of a pulse encoder, determining the average speed at each time interval and the values of angular acceleration, according to the invention, the relative movement of the parts of the pulse encoder is created, differently associated with the controlled object, ensuring that the sensor generates the maximum number of pulses, and measure of angular acceleration at the end portion of braking controlled object.

And this is also achieved by the fact that the device for measuring the angular acceleration of the controlled object, containing a pulse sensor of angular position, a recording device and a calculator, is equipped with an inertial mass and an overrunning clutch installed between the controlled object and the inertial mass, while the inertial mass is rigidly fixed to the pulse shaft angle sensor.

In addition, in the device for measuring the angular acceleration of a controlled object, a encoder encoder is selected as a pulse angular position sensor.

The technical result consists in the fact that it was possible to reduce the uncertainty of the sequence of angular positions of the controlled object and the number of obtained values of angular acceleration in an important time interval - immediately before it stops and at the time of stopping, reducing the pulse period of the angular position sensor and increasing the number of these pulses.

The presence in the claimed invention features that distinguish it from the prototype, allows us to consider it appropriate to the condition of "novelty."

New features of the method (creation of relative motion of parts of a pulsed angular position sensor differently associated with a controlled object, ensuring the generation of a maximum number of pulses by a pulsed sensor at the final section of braking of a controlled object and measurement of angular velocity during braking) and a device for measuring the angular acceleration of a controlled object (supplying it with an inertial mass and an overrunning clutch installed between the controlled object and inertia mass, while the inertial mass is rigidly fixed to the shaft of the pulse sensor of the angular position) are not identified in technical solutions of a similar purpose. On this basis, we can conclude that the claimed invention meets the condition of "inventive step".

The drawing shows a General view of the proposed device.

The device for measuring the angular acceleration of the controlled object 1, for which the faceplate is selected, contains a pulsed angular position sensor 2, the housing of which is rigidly mounted on the controlled object 1, a recording device 7, which records in relation to time the signals from the optocouplers 4 included in the angular sensor position 2, calculator 8, overrunning clutch 6, installed between the controlled object 1 and the inertial mass 5, rigidly mounted on the shaft of the optical disk 3 of the angle sensor 2, as The encoder encoder, which gives out 3600 pulses per one revolution of the optical shaft, was selected.

The device operates as follows.

The controlled object 1 is driven into rotation, while the angular position sensor 2 and the inertial mass 5 at the stage of braking preparation rotate together with the controlled object 1 and have the same angular velocity. Pulses are not received to the recording device 7, since the optical disk 3 does not rotate relative to the housing of the pulse sensor of the angular position 2 and the optocouple 4 installed in it.

When braking the controlled object 1, the housing of the sensor of the angular position 2 is braked with it, and the inertial mass 5 continues to rotate at the speed achieved during acceleration, since the overrunning clutch 6 does not prevent this. As the controlled object 1 decelerates, the pulse repetition rate from the optocouplers 4 increases and reaches a maximum at the moment the controlled object 1 stops. All pulses are recorded with a time reference by recording device 7. In calculator 8, the average speed of the optical disk 3, continuing rotation, is determined at each angular interval , relative to the body, braking along with the object, and the angular acceleration is determined by the difference in speed values at adjacent intervals. Moreover, due to the fact that the speed of rotation of the optical disk 3 relative to the housing of the sensor of the angular position 2 is maximum at the moment the controlled object 1 stops, the number of obtained speed values at the important section is also maximum. The maximum acceleration is achieved at the moment of stopping the angular position sensor 2 (plan washers), in the last 5-10 angular minutes about (20-30)% of angular acceleration is achieved. In the absence of the described connection of the parts of the encoder 2 in an important area, 1-2 pulses will be registered, and in the presence of 100-200 pulses.

The inventive method and device made it possible to increase the accuracy of determining angular acceleration in the final section of braking of the controlled object.

For the claimed invention in the form described in the claims, the possibility of implementing a method and device for measuring the angular acceleration of a controlled object and the ability to achieve the technical result perceived by the applicant is confirmed. Therefore, the claimed invention meets the condition of "industrial applicability".

Claims (3)

1. The method of measuring the angular acceleration of a controlled object, including measuring the duration of time intervals between the edges of all pulses of a pulse encoder, determining the average speed at each time interval and determining the values of angular acceleration, characterized in that the relative motion of the parts of the pulse encoder is different associated with the controlled object, ensuring the generation of a maximum number of pulses by the pulse sensor in the final section deceleration of the controlled object, and produce a measurement of the angular acceleration values during braking. 2. A device for measuring the angular acceleration of a controlled object, containing a pulsed sensor of angular position, rigidly mounted on the controlled object, a recording device and a computer, characterized in that it is equipped with an inertial mass and an overrunning clutch installed between the controlled object and the inertial mass, while inertial the mass is rigidly fixed to the shaft of the pulse encoder angular position. 3. A device for measuring the angular acceleration of a controlled object according to claim 2, characterized in that the encoder encoder is selected as a pulse sensor of angular positions.