Method and apparatus for semi-active reduction of compression oscillations in a hydraulic system

Abstract

The invention relates to a method and a device for the semi-active reduction of pressure oscillations in a hydraulic system of a cold- or warm-rolling train or a strip conditioning installation for iron, steel or aluminum materials. The aim of the invention is to provide a method and a device by means of which occurring pressure oscillations can be effectively suppressed by means of a simple and cost-effective device. This aim is achieved by a method of the type mentioned above, comprising the following method steps in the sequence specified: a) detecting a pressure signal by means of a pressure sensor through permanent pressure measurement in the hydraulic system; b) determining an alternating component of the pressure signal; c) determining in real time at least one variable that changes over time with the aid of a controller while taking the alternating component into consideration; d) subjecting at least one actuator to the variable, wherein the actuator changes a natural frequency of an oscillation absorber that is connected to the hydraulic system, thereby reducing the amplitude of the pressure oscillations in the hydraulic system.

Description

Technical field [0001] The invention relates to a method and a device for semi-actively reducing compression oscillations in a hydraulic system of a cold rolling or hot rolling mill or strip processing equipment for iron, steel or aluminum. Background technique [0002] It is known that the periodically occurring compression oscillations in hydraulic systems cause various problems, such as excessive noise formation, reduced service life of components, and interference in the regulation circuit. Compression oscillations are either generated in the hydraulic system itself, such as due to uneven pump delivery or due to valve actuation, etc., or due to external causes, such as periodic load changes of hydraulic cylinders or hydraulic motors. In addition, it is known that, especially in a high-power hydraulic system composed of a high-power continuous hydraulic valve (such as an electrically actuated proportional valve or a servo valve) and a hydraulic cylinder or a hydraulic motor, i...

AI Technical Summary

Problems solved by technology

This leads to actuators that are no longer compact (especially with a large volume) and only more advanced and expensive actuators can be used due to the high demands on power density

Another disadvantage of active oscillation compensation systems is the additional input of energy into the hydraulic system via actuators, which in principle degrades the stability of the overall system and can even lead to system performance especially if the regulator is not precisely adjusted Deterioration (that is, the amplitude of compression oscillations increases instead of falling)

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