CS276926B6 - Mechanical system suitable for smooth tuning - Google Patents

Abstract

The mechanical system relates to a torsionally oscillating mechanical system and is intended for the implementation of continuous tuning using a torsional oscillation tuner /2/ and an additional control system /5/. The essence of the solution lies in the method of tuning by continuously changing the overpressure of the gaseous medium in the torsional oscillation tuner /2/ during operation of the system, which continuously changes the frequency of the natural oscillations of the system so that within the scope of its operating mode there is no resonance state, which would cause dangerous torsional oscillations of the given system.

Description

Mechanical system suitable for continuous tuning

Report techniques

A mechanical system suitable for the implementation of continuous tuning is included in the area of any torsionally oscillating mechanical systems, most often in the area of mechanical systems with a driving or driven piston device.

The state of the art

Due to the excessive torsional vibration of mechanical systems, it is necessary to perform their appropriate adjustment or tuning. The purpose of tuning is to adjust the stiffness, damping or weight parameters of some members of the system (the most commonly used flexible shaft couplings) so that dangerous torsional vibrations do not occur during the operating mode. All currently performed tuning or tuning of the mechanical system represent interventions in its dynamics in a quiet state, i. at the time before its commissioning. Then the system works with tuned (adapted) characteristics of the properties of the flexible shaft coupling, which, however, are constant and unchanged during its operation, of course if we do not take into account the aging and fatigue of its flexible members. Due to aging and fatigue, the flexible shaft coupling gradually loses its flood-positive properties, as a result of which the pre-tuned mechanical system begins to be out of tune. It follows that the tuning of the torsionally oscillating mechanical system would be little performed in a new way - the method of continuous tuning, i. tuning of the mechanical system during its operation. The constructions of current torsionally oscillating mechanical systems do not meet the requirements for the implementation of continuous tuning.

The essence of the invention

These shortcomings are eliminated by a torsionally oscillating mechanical system that meets the requirements for the implementation of continuous tuning. The essence of the invention is that the torsional oscillating mechanical system improved by us comprises a torsional oscillation tuner controlled by an additional control system.

The theoretical essence of continuous tuning of a torsionally oscillating mechanical system is characterized by the possibility of a continuous change of the overpressure of the gaseous medium in the torsional oscillator during the operation of the mechanical system. By a continuous change of the overpressure of the gaseous medium in the torsional oscillator, we ensure a change of its basic dynamic property, i. dynamic torsional stiffness. By changing the dynamic torsional stiffness, we continuously change the frequency of the natural oscillations of the mechanical system so that no resonant state occurs in the entire working range of the rotational frequency. The regulation of the continuous change of the overpressure of the gaseous medium in the torsional oscillator is ensured by an additional control system, which is an inseparable part of the newly realized mechanical system. Thus, our improved torsionally oscillating mechanical system is advantageous over current mechanical systems in that by using a torsional oscillator and an additional control system, we are able to realize continuous tuning, i. tuning of the mechanical system during its operation.

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Overview of the image in the drawing

In the attached drawing, the figure shows a schematic design of our improved torsionally oscillating mechanical system suitable for the implementation of continuous tuning with an additional control system.

Example of an embodiment of the invention

The driving part 1, formed for example by an electric motor, is actuated by means of a torsional vibration tuner 2, which at the same time performs the function of a flexible shaft coupling, a driven / loaded / part 3 of a torsionally oscillating mechanical system, formed e.g. any piston device. The change of the overpressure of the gaseous medium in the torsional oscillator 2 is controlled by an additional control system 5 and the actual supply of gaseous medium to the tuner is ensured by a supply path consisting of line 6, rotary connection 4 and vented shaft of electric motor 1.

When operating a mechanical system in an unfavorable area of its operating mode, i. when the frequency of the transmitted load is equal to or close to the frequency of the system's own oscillation, ie we say that the system has reached resonant oscillations or oscillations close to the resonant state, the whole system oscillates. The oscillation of the system is sensed, controlled and controlled by the control system 5, which represents an immediate change of the overpressure of the gaseous medium in the torsional oscillator during the operation of the device. By continuously changing the overpressure of the gaseous medium in the torsional oscillator, we continuously change the frequency of the system's own oscillations, ie we adapt it to the frequency of transmitted load so that its resonant state does not occur in the operating mode of the mechanical system.

Industrial usability

The use of the present invention, i. Improving co-existing mechanical systems to meet the requirements for continuous tuning by means of a torsional oscillator and an additional control system increases the technical level and operational reliability of all torsionally oscillating mechanical systems. By tuning the torsionally oscillating mechanical system during operation, we ensure that during the operating mode a resonant or near resonant state does not occur and at the same time dangerous torsional oscillations emanating from it.

Claims (1)

PATENT CLAIMS Mechanical system suitable for performing continuous tuning, consisting of a drive part, a driven part, an additional control system, characterized in that at least one torsional oscillator (2) controllable by an additional control system is arranged between the drive part / 1 / and the driven part / 3 /. system / 5 /.