Papers by Keyword: Hydraulic System

Abstract: Hydraulic systems are widely used in almost all industries. However, a significant drawback of hydraulic systems is large energy loss. One of the main reasons is the improper power design that causes excessive energy consumption by generating heat in the system, which reduces the equipment's lifespan and increases operating costs in production. In this study, we propose a power control system for hydraulic systems using servo control valves. The hydraulic station consists of a fixed displacement pump driven by an AC servo motor, which is controlled to change speed based on the feedback pressure from the load in order to control the pump's output power, thus also controlling the overall power of the system. The study begins with the proposal of the hydraulic system, followed by model establishment, simulation, experimental implementation in the workshop, and evaluation. The initial research results show that the system is capable of controlling power, improving energy efficiency, and ensuring the accuracy of the motion of actuator.

Abstract: The trawler winch is a main winching tool in the fishing operation of trawler. The disturbing influence of various factors such as sea wind and waves, change in the size of the catch and the turning of the fishing vessel during the operation of the trawler will cause unbalanced force on the wire rope of the two winches, which will easily cause the deformation and damage of the fishing net facilities and directly affect the improvement of the fishing yield and increase the harvest. In order to compensate for the change of the tension of the winch tractor during the operation of the trawler, the change of the load tension caused by the wave, or the rotation direction of the fishing vessel, and to ensure the good shape of the net opening, an electro-hydraulic control technology was used to design an automatic trawler tension controller. The tension control method of the trawler is investigated. The tension sensor is used as the input information of the electrical signal of the trawler's left and right trawler, which is measured indirectly and transmitted to the controller for logical operation, and the output torque of the hydraulic motor is changed by controlling the pilot overflow, which drives the trawler winch to adjust the tension of the left and right trawler to achieve the dynamic balance of the control system. In order to solve the problem of the tension of the trawl and the influence of the length change on the trawl, we designed an intelligent control system combining PLC control system and hydraulic system and used AMEsim hydraulic simulation software system to model and simulate it, the results show that without PLC control the torque of hydraulic motor 1 is 2387.7NM, the torque of hydraulic motor 9 is 2148.64NM the difference is 239.06 NM uneven force on both sides of the trailing platform, after adding PLC adjustment torque is obviously controlled torque to maintain about 2300NM, within a certain range to play a reliable adjustment effect.

Abstract: Although aircraft carriers operating in the seas have developed considerably from a constructive point of view, naval aviation continues to face significant challenges due to short runways, often in motion or unpredictable weather conditions, as a rule. This paper aims to analyze the concept of aircraft's rapid deceleration to landing, as well as to study the dynamic behavior of the aircraft restraint system used by aircraft carriers.

Abstract: During the ongoing operation of the hydraulic system you need a drive control information capable of maintaining fitness. Existing methods for assessing the technical condition of the hydraulic system require dismantling the hydraulic units and their research on test rigs. These methods are expensive, time consuming and do not provide a quick assessment of the technical condition. The aim of the study is to present the possibilities of using the evaluation of technical aviation hydraulic drive method which involves the use of objective information from the aircraft's flight control. In the proposed method, the carrier of information to the ongoing evaluation of the technical condition of the hydraulic system aviation as a whole is the pressure prevailing in it. With pressure and its features is inextricably bound up time. This relationship may be obtained directly from the objective flight control of the aircraft. The greatest credibility and the diagnostic value of two control parameters are obtained from the flight control objective. The first time the air pressure drop in the hydraulic drive from the top to the bottom of the measured value of the measured value after switching off the power unit. The second time the pressure falls below a certain value, and its return to the values ​​of the movement during the hydraulic motor. The method enables the ongoing assessment of the technical condition of the hydraulic system is a fast and costless.

Abstract: Unplanned outage of extensive transport and handling equipment used between main stages of the production process has magnified negative effect on logistics of the entire company. Article introduces information about examining and assessing the level of wear of working oil charge in an extensive hydraulic system of device used for the transport and processing of wood raw material between the woodworking line aggregates. The decisive role in preventing the listed unsolicited situation has respecting the early tribodiagnostic signal through the analytical ferrography. Completion of this particle analysis by information complex from other appropriately selected diagnostic methodologies will be essential for the trend analysis of wear regime of system oil charge creation. The analysis is also a key predictive information about state of degradation of internal contact surfaces of the examined machinery.

Abstract: In the working process of hydraulic system, it is usually hard to match the operating parameters with the real-time load to get the optimized efficiency. This paper proposes an operating parameters matching and efficiency optimization method for hydraulic system based on data envelopment analysis(DEA). This method can provide the optimal input parameter scheme corresponding to the real-time load of system. Simulation experiments are carried out by AMESim. Results show that this method can improve the system efficiency by adjusting the input parameters to better match the output parameters on the premise of without changing the normal function of system. The study provides a theoretical basis for applying this method into practical engineering of hydraulic system efficiency optimization.

Abstract: The condition monitoring of seals is very important in the working process of the hydraulic system. However, it is often difficult because of the limitation of the structure. The purpose of this study is to find an effective way to solve it. With finite element analysis (FEA) software Ansys Workbench, and the O-ring is taken as the example for the comparative study of the contact strain between the O-ring and the sealing groove under normal condition and failure mode respectively. The results show that the contact strain on the sealing groove under normal condition and failure mode are different. A certain rule is presented as the working medium pressure, pre squeeze rate, sealing groove notch radius and temperature changes. It provide an important basis for further monitoring of O-ring failure through contact strain changes in sealing groove.

Abstract: An accumulator is an auxiliary component in a hydraulic system as it stores the energy and avoids the pump from running continuously through the system which can reduce the pumps life. The accumulator is also used as the power source in the hydraulic hybrid system to accelerate the vehicle. A common hydraulic system uses the hydraulic oil as their working medium, but there is an application using water due to the high accessibility and environmental concern. In this paper, an accumulator is developed by using weighing method to increase the pressure in the system. This system uses water as a medium to provide clean environment as well as safe for mobile purpose. The system includes electric motor, water pump, directional control valve, pressure control valve and motor hydraulic. The performance of the accumulator is obtained by measuring the ratio of output and input pressure. The source of electricity is varied by using an inverter to control the frequency and the power of the pump. From the experiment, the pressure output and flow rate decreased with the increasing of the loads on top of the accumulator, while the pressure loss increased with the number of load. The operational frequency is optimal at a low reading compared to a higher frequency.

Abstract: The Lithium-electric Excavator Hydraulic System (Li-EEHS) is based on economic analysis of energy consumption, and it has changed the excavator counterweight into Lithium-ion Battery in order to replace the engine. A computational analysis which takes the Qingdao heavy industry excavator HW130 as the example demonstrates the accessibility of the scheme. The total efficiency of the excavator has been improved from 7% to 17.1% by the Li-EEHS without energy regeneration, while the cost has been decreased from 750¥/day into 240¥/day. And the cost recovery will take around 3.3 years (about 500,000¥).The article typically analyzes the system scheme and the working features for 4 major Li-EEHS.

Abstract: A kind of breakdown diagnosis algorithm was proposed based on Ant colony algorithm. The problem of fault identification and classification was translated to a constrained optimized clustering problem under certain conditions in this algorithm. It was applied to the process of fault diagnosis of a hydraulic system. The results show the algorithm is valid and reasonable.