Electro hydraulic servo system heat balance determination method

An electro-hydraulic servo system and a technology for determining methods, which are applied in fluid pressure actuation system testing, fluid pressure actuation devices, mechanical equipment, etc., and can solve problems such as difficult thermal characteristics, many components of the servo system, and large temperature differences

Active Publication Date: 2016-12-14
BEIJING RES INST OF PRECISE MECHATRONICS CONTROLS +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The servo system consists of many parts, the temperature difference of each part is large, and the working and heating mechanism is complicated. This method is difficult to accurately simulate its thermal characteristics, and can only be used for rough estimation of the temperature in the early stage of the project.

Method used

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  • Electro hydraulic servo system heat balance determination method
  • Electro hydraulic servo system heat balance determination method
  • Electro hydraulic servo system heat balance determination method

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Embodiment

[0069] A certain type I level servo system is selected as the research object, and its thermal balance calculation and experimental research are carried out using the method of the present invention. The system is a one-to-two electro-hydraulic position servo system. According to the above 17 steps, the value of each parameter is completed. The equations are programmed under MATLAB and solved by the ode15s variable-order numerical differential algorithm to obtain 0~600 Second, the temperature of each node changes with time, and the simulation curve is analyzed, and the system quickly reaches an approximate thermal equilibrium state. The oil temperature in various places reaches equilibrium in about 30 seconds, and the temperature of each outer wall rises slowly after 100 seconds. When balancing, the temperature of the turbo mechanical seal is above 100°C, the temperature of the outer wall of the turbine and the pump support is around 0°C, and the temperature of the remaining ma...

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Abstract

The invention relates to an electro hydraulic servo system heat balance determination method. Aiming at the heat balance calculation of a servo mechanism, an existing method adopts a servo system as a temperature whole body, energy power is assumed to completely convert into heating, and the heat is absorbed by oil liquid and a structure through heat capacity and is converted into temperature rise. However, component parts of the servo system are more, the temperature difference of the parts is large, and an operating and heating mechanism is complicated, so that the method is hard to accurately simulate the heat property. According to the electro hydraulic servo system heat balance determination method provided by the invention, a servo system is decomposed into a turbine, a tangent pump, a heat exchanger, an overflow valve and other main elements; the elements are divided into flowing nodes and outer wall nodes; heat of each part is calculated; a heat model of the servo motor is built through a heat capacity-heat resistance (R-C) theory; and the heat circularly flows in the servo system along with hydraulic oil, so that the heat of the nodes is mutually affected, and finally the heat balance of the servo system is achieved.

Description

Technical field [0001] The invention relates to a method for determining the thermal balance of an electro-hydraulic servo system, which can determine the final thermal balance point of the electro-hydraulic servo system and provide a reference for the design of the electro-hydraulic servo system. Background technique [0002] my country's new generation of launch vehicles put forward greater power requirements for the servo system, and the flight mission time has also been lengthened. In addition, the installation space around the engine is limited, the flight thermal environment is harsh, and the volume and weight requirements are more stringent. The importance of the thermal design of the servo system is becoming increasingly prominent. For a new rocket I-level servo system, how to control the temperature of the hydraulic working medium within a reasonable range within the mission time has become the key to ensuring the success of the program. [0003] Regarding the calculation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B19/00
CPCF15B19/007
Inventor 吕凤实张晓莎景光辉王增秦向明兰天
Owner BEIJING RES INST OF PRECISE MECHATRONICS CONTROLS
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