Implementation and Application of a Real-Time Control System using Matlab/xPC

A real-time control system for rolling mill control such as the Hille 100 experimental rolling mill was developed based on Matlab Simulink, Real-Time Workshop and xPC Target. The Host-Target PCs architecture for the control system was introduced, then the approach for the implementation of data acquisition, real-time control and the associated graphic user interface (GUI), were discussed in detail. Some limitations of the commercial software were also presented. The developed control system has been verified with Hille 100 rolling mill in laboratory, indicating the effective application in rolling mill control

Development history, current situation and prospect of international vegetable oil-based hydraulic oil

Vegetable oil-based hydraulic oil is one of the biodegradable lubricants. With the strengthening of environmental awareness, especially in the context of the increasingly serious pollution of the marine environment by mineral oil used in ships, people are increasingly aware that the pollution of mineral oil-based hydraulic oil to the environment is very serious, and many solutions have been proposed. The use of biodegradable plant-based hydraulic oil instead of traditional mineral oil-based hydraulic oil can fundamentally solve the pollution of marine hydraulic oil to the marine environment. The development of vegetable oil-based hydraulic oil in the world is systematically summarized, including its material composition, physical and chemical properties. By analysing its practical prospect and future development direction, it is concluded that vegetable oil-based hydraulic oil is the most environmentally friendly hydraulic oil in the future shipbuilding, industrial manufacturing and other industries, and it is the development trend of “green shipping” in China in the future

Development history, current situation and prospect of international vegetable oil-based hydraulic oil

Vegetable oil-based hydraulic oil is one of the biodegradable lubricants. With the strengthening of environmental awareness, especially in the context of the increasingly serious pollution of the marine environment by mineral oil used in ships, people are increasingly aware that the pollution of mineral oil-based hydraulic oil to the environment is very serious, and many solutions have been proposed. The use of biodegradable plant-based hydraulic oil instead of traditional mineral oil-based hydraulic oil can fundamentally solve the pollution of marine hydraulic oil to the marine environment. The development of vegetable oil-based hydraulic oil in the world is systematically summarized, including its material composition, physical and chemical properties. By analysing its practical prospect and future development direction, it is concluded that vegetable oil-based hydraulic oil is the most environmentally friendly hydraulic oil in the future shipbuilding, industrial manufacturing and other industries, and it is the development trend of “green shipping” in China in the future

Raziskava modela in dinamičnih lastnosti novega proporcionalnega hidravličnega ventila, ki ga poganja zvočniška tuljava

As the key control component of the water hydraulic systems, water hydraulic proportional valve has an important influence on the control performance of the systems. Due to the poor viscous and lubricity of water, the valve spool resistance is not only large, but also nonlinear. In this study, a novel fast-response water hydraulic proportional valve is presented. The actuator of the valve adopts voice coil motor (VCM), which has the advantages of fast response, high control precision and small volume. In order to realize the fast control of the valve, a lever amplifier is designed to obtain enough actuation force. A detailed and precise nonlinear mathematical model of the valve considering both the valve structural parameters and VCM electromagnetic characteristics is developed. A comprehensive performance simulation analysis has been carried out, which can be mainly divided into electromagnetic simulation, characteristics analysis of lever magnifier and dynamic performance simulation of the valve. The simulation results show that the adjusting time is about 28ms and the maximum overshoot is about 5%. The step response rise time is about 15ms. The test rig of the valve and VCM have been built, respectively. The test results of the prototype show that the optimal stroke range of VCM is 4mm ~15mm. The maximum overshoot of the valve is all around 10%, the adjusting time is about 30 ms in the opening process, and 35 ms in the closing process. The test results prove that the valve has good static and dynamic control performance

Deformation investigation of electromagnetic diaphragm pump rubber diaphragm.

A diaphragm pump is a type of volumetric pump that has excellent sealing performance. An electromagnetic diaphragm pump is a kind of widely adopted diaphragm pump that has a simple structure, low power loss, and high cost performance. However, the calculation method of deformation for the electromagnetic diaphragm pump rubber diaphragm is presently lacking. Herein, a calculating method of deformation for the electromagnetic diaphragm pump rubber diaphragm is proposed. By establishing and analyzing a deformation model of the electromagnetic diaphragm pump rubber diaphragm, a theoretical relationship between the deformation of the electromagnetic diaphragm pump rubber diaphragm, the size of the electromagnetic diaphragm pump rubber diaphragm and the pressure of fluid is determined. The experimental results indicate that the biggest difference between the tested axial deformation and the calculated axial deformation of the electromagnetic diaphragm pump rubber diaphragm is 0.04 mm and the calculation results show agreement with the experimental results

An Adaptive Control Method for the Distribution Valve of a Digital Pump

Perfect flow distribution is extremely important and essential for digital pumps. However, the fluctuation of motor speed and the change of valve dynamic characteristics cause the flow distribution flaw, which generates the backflow of the oil in the piston chamber and the decrease in pump volumetric efficiency. Based on the three-dimensional and mathematical modeling of the digital pump, the perfect distribution state of the digital pump is analyzed. Then, the adverse effects of the variations in motor speed and valve dynamic characteristics on the flow distribution of the digital pump were simulated and investigated by the software AMESim. To overcome the aforementioned problems, we proposed an adaptive control method for the flow distribution valve of a digital pump, which was realized by adopting the axis rotation angle and the pressure difference between the inlet and outlet of the flow distribution valve. The results show that the control signal of the flow distribution valve can be regulated automatically along with the motor speed and the valve dynamic characteristics, achieving the ideal flow distribution of the digital pump designed in this paper. The study can be used as a reference for the optimal design and prototype manufacturing of the digital pump

An Adaptive Control Method for the Distribution Valve of a Digital Pump

Perfect flow distribution is extremely important and essential for digital pumps. However, the fluctuation of motor speed and the change of valve dynamic characteristics cause the flow distribution flaw, which generates the backflow of the oil in the piston chamber and the decrease in pump volumetric efficiency. Based on the three-dimensional and mathematical modeling of the digital pump, the perfect distribution state of the digital pump is analyzed. Then, the adverse effects of the variations in motor speed and valve dynamic characteristics on the flow distribution of the digital pump were simulated and investigated by the software AMESim. To overcome the aforementioned problems, we proposed an adaptive control method for the flow distribution valve of a digital pump, which was realized by adopting the axis rotation angle and the pressure difference between the inlet and outlet of the flow distribution valve. The results show that the control signal of the flow distribution valve can be regulated automatically along with the motor speed and the valve dynamic characteristics, achieving the ideal flow distribution of the digital pump designed in this paper. The study can be used as a reference for the optimal design and prototype manufacturing of the digital pump

The Difference in Tribological Characteristics between CFRPEEK and Stainless Steel under Water Lubrication in Friction Testing Machine and Axial Piston Pump

A water lubricating axial piston pump (WLPP) is the core power component of a green and environmentally friendly water hydraulic system. The friction and wear of the friction pairs of a WLPP are the key factors that restrict its development. In order to explore the friction and wear mechanism of materials, the tribological properties of CFRPEEK against 316L and 1Cr17Ni2 under water lubrication were investigated in a friction testing machine and an axial piston pump, respectively. An environmental scanning electron microscope (ESEM), confocal laser scanning microscopy and a surface profiler were used to analyze the morphology of the samples. In a friction testing machine, two different metals are paired with CFRPEEK, and the friction coefficient and wear rate barely show any differences. The wear rate of CFRPEEK is two orders of magnitude higher than that of metal. In the WLPP, 316L can hardly be paired with CFRPEEK, while 1Cr17Ni2 works well. The wear of 1Cr17Ni2 in the WLPP is greater than that of CFRPEEK. The high-pressure water film lubrication friction pairs cause the wear of the metal and show the difference in these two test methods. The wear mechanism is mainly abrasive wear. Improving the wear resistance of metals is very important for the development of WLPP