A practical approach to design a feedforward-plus-proportional-integral-derivative (FPID) controller for accurate and smooth velocity control on a hydraulic linear actuator is presented. The integrated controller consists of a feedforward loop and a PID loop. The feedforward loop is designed to compensate for the nonlinearity of the electrohydraulic system, including the deadband of the system ...

Owing to the high power consumption and limited control precision of traditional hydraulic drive winch systems, this study proposes electric-type energy recovery systems. The accumulator used in type has low density, which makes it difficult store a large amount energy. Meanwhile, electric motor/generator cannot solve secondary slip because oil leakage, leads controllability high-power under ne...

The implementation of lightweight technology is great significance to save energy, reduce pollution and achieve sustainable development. Lightweight mainly includes the use materials, such as high strength steel, magnesium alloy, aluminum engineering plastics, composite materials), advanced production technology, laser tailor-welded plate hydraulic forming steel red-hot technology), structural ...

The impact of forwarder traffic on soil physical properties was evaluated on a Gwinnett sandy loam, a commonly found soil of the Piedmont. Soil strength and saturated hydraulic conductivity were significantly altered by forwarder traffic, but reductions in air-filled porosity also occurred. Bulk density did not increase significantly in trafficked treatments. The greatest impacts to soil physic...

Pumps are often used in both industrial applications and mobile hydraulic machinery. In variable displacement pumps, the flow rate is dictated by the system requirements. The electro-hydraulic pump is a new integrated product, which comprise the combination of a pump and motor as a unit replacing the traditional connection with a shaft coupling. The pump is actuated without a rotating shaft uti...

Linear electro hydraulic servo-drives have been built and used in various industrial equipment for more than sixty years. They are distinguished by the ability to develope extremely large forces with the positioning accuracy of the order of a micrometer, ensuring, at the same time, very good dynamic features. The drives characterised by very slow motion and large force are used, among others, i...

In this paper I will present a summary of Turing’s article “Computing machinery and intelligence” [26] and discuss it. I retrace the ideas Turing presented in this paper and explain their historical context. Also, I discuss the impact Turing’s ideas had on the scientific community when the paper was published in 1950 as well as the meaning they still have today. Throughout this paper, I include...

This paper studies the energy-saving adaptive robust precision motion control of a single-rod hydraulic cylinder through the use of programmable valves. The programmable valves used in this study is a unique combination of five proportional cartridge valves connected in such a way that the meter-in and meter-out flows can be independently controlled by four of the valves as well as a true cross...

The cavitation phenomenon is an important factor affecting the safe and stable operation of hydraulic machinery units. units can lead to increased vibration, reduced efficiency, erosion blades. Therefore, a method needed determine incipient runner This study initiated from acoustic characteristics bubbles generated by model turbines radiated sound energy during cavitation. noise are studied. Af...

Abstract The hydraulic scissor lift is a widely used special lifting equipment. In its repeated ascent and descent, the gravitational potential energy of platform wasted. To address this problem, new energy-saving system based on accumulator proposed in paper. A simulation model established. shows that can recover up to 73% while reducing installed power electric motor by 60%, specifically from...