Influence of undissolved gas in working liquid on dynamics of a logger hydraulic drive
The urgency of the discussed issue is caused by the fact that working liquids of a hydraulic drive often contain undissolved air. If the hydraulic liquid filling the device is not exposed to a vacuum, it will be a mixture of liquid and gas. The same mixture can be formed in a hydraulic drive during...
| Main Authors: | , |
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| Format: | Article |
| Language: | Russian |
| Published: |
Tomsk Polytechnic University
2019-05-01
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| Series: | Известия Томского политехнического университета: Инжиниринг георесурсов |
| Subjects: | |
| Online Access: | http://izvestiya.tpu.ru/archive/article/view/1424 |
| Summary: | The urgency of the discussed issue is caused by the fact that working liquids of a hydraulic drive often contain undissolved air. If the hydraulic liquid filling the device is not exposed to a vacuum, it will be a mixture of liquid and gas. The same mixture can be formed in a hydraulic drive during the dynamic processes due to the different rates of gas dissolution and emission at pressure drop on separate areas of working environment flow. Therefore, the paper considers the influence of gas content in working liquid on dynamics of a hydraulic drive. The main aim of the study: evaluation of influence of undissolved gas percentage in working liquid on dynamics of a hydraulic drive. The methods used in the study: methods of theoretical mechanics and fluid mechanics are used setting up equations describing processes in hydraulic drive; numerical methods for solving ordinary differential equations systems, the Runge-Kutta method of the 4th order using the software package Mathcad. The results: The authors have developed the mathematical model of a logger hydraulic drive that allows investigating transient processes and have carried out the systematic calculations of the dynamics of a hydraulic drive. The conclusion: The results of calculations show that even a small amount (up to 1 %) of undissolved gas in working liquid influences the change of the basic parameters in transient processes. Undissolved gas in working liquid influences most of all in the initial period of a boom and a rotary foundation movement. The mathematical model of a logger boom and rotary foundation movement allows investigating the influence of undissolved gas in working liquid on dynamics of the hinged equipment at a design stage, and selecting as well the optimum values of drive parameters. The results of calculations of the dependence of change in an angle and angular velocity of a boom and a rotary foundation, as well as the pressure in piston and rod cavities of hydraulic cylinders are shown in the form of graphs. |
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| ISSN: | 2500-1019 2413-1830 |