Due to its advantages of having a high power-to-weight ratio and being energy-efficient, the electro-hydraulic servo pump control system (abbreviated as EHSPCS) is frequently employed in industrial field, such (EHSPC) servomotor for steam turbine valve regulation control. However, EHSPCS has strong nonlinearity time-varying features, factors that cause performance degradation are complex. Once failure occurs, it may lead serious accidents, causing casualties economic losses. To address above...

A lensless optical system for implementing the coincidence fractional Fourier transform (FRT) is proposed. The conditions to implement FRT with incoherent light and entangled photon pairs are discussed. results offer a novel scheme FRTs thus suggest useful applications.

It is difficult for tunnel boring machine (TBM) operators to respond safe and high-efficient construction without accurate reference parameters such as the TBM thrust. A new hybrid model (MRFO-AT-TELM) combining an improved two-hidden-layer extreme learning (AT-TELM) manta ray foraging optimization (MRFO) algorithm proposed predict thrust with 12 selected input featuring parameters. The affine transformation (AT) activation function used improve performance of TELM. Input weights bias...

A hydro-viscous drive clutch is a complicated system with time-varying and nonlinear characteristics. In order to improve the dynamic performance of system, kind robust self-adaptive PID control strategy based on single neuron algorithm proposed. The proposed adaptive comparison fuzzy investigated system. theoretical analysis simulation results demonstrate effectiveness strategy.

A control strategy combining adaptive backstep sliding mode and dead-zone inverse compensation in a series was proposed to solve the problem of system parameter uncertainty process position an electro–hydraulic servo closed pump system. Firstly, backstepping controller designed by introducing principle. Secondly, smooth function constructed using continuous index design controller, which is combined with form controller. Finally, feasibility verified lithium battery pole strip mill. The...

Electro-hydraulic excitation systems are key equipment in various industries. Electric motor driving rotary valves mostly used existing systems. However, due to the separate design of and hydraulic parts, highly compact integration cannot be achieved by these type Moreover, investigation on influence relevant parameters system has been insufficient previous studies. To overcome problems, a novel full electro-hydraulic scheme as well analysis presented this paper. Theoretical models flow...

Accurate mathematical patterning of friction has always been a significant research project in the domains machinery and control, played crucial role analysis, control compensation mechanical systems containing friction. For high-property electrohydraulic servo systems, is an urgent problem to be solved. The LuGre pattern can represent most frictional behaviors, but piecewise-continuous, making it non-differentiable. Therefore, question how combine pattern, enhancing its tracking capacity...

<title>Abstract</title> Double-shield tunnel boring machine (TBM) has been widely used in construction. However, the unknown adverse geological conditions front of face can easily disturb construction progress double-shield TBM. To ensure safety TBM, it is necessary to predict information advance. unique environment with a TBM makes hard by conventional detection techniques. Therefore, this paper proposes TBM-mounted seismic ahead-prospecting system. According special structure system mainly...

During the static finite element analysis of gripping-thrusting-regripping mechanism, in order to avoid modeling repeatedly different positions within whole tunneling range, all components mechanism are divided into two types sub-modules, i.e. motive sub-modules and fixed according variations geometric physical parameters. The contact elements between connected by motion pairs counted as interfaces. Based on this, methods interfaces proposed respectively under SAMCEF software environment,...

Ship locks on mountain rivers usually experience difficulties owing to harsh flow conditions such as strong oblique and backflow, which significantly affect navigation safety efficiency. To improve conditions, a structural measure involving pile-foundation permeable dislocation-type diversion vanes, new type of structure, is proposed by analyzing the features working mechanisms existing structures. Based typical ship lock—the Wuqiangxi Lock—model tests including various schemes were...

Facing the development trend of electrification construction machinery, in view drawbacks existing electro-hydraulic-load-sensitive system terms dynamic characteristics and usage energy, based on drive source a servo motor-driven quantitative pump, an basis torque open-loop control was proposed. Firstly, working principle introduced system’s operating energy consumption were theoretically analyzed. Secondly, order to balance maneuverability, strategy with variable pressure margin designed....

Abstract As a fundamental component of an automobile engine's timing chain drive system, the hydraulic automatic tensioner significantly enhances fuel economy while minimizing system vibrations and noise. However, there is noticeable lack research on tensioners. This study presents comprehensive calculation approach for principal parameters tensioner. An effective method, grounded in hydraulics multibody dynamics, was introduced estimating dynamic response such The simulation model developed...

Aimed at four degree of freedom (DOF) hydraulic manipulator, an inverse kinematics solution is proposed from Cartesian space to drive based on geometrical method. To the structural and diver characteristics a forward conducted by using D-H The position orientation manipulator's end-effector can be obtained under constraint. By analyzing structure, manipulator obtained, conversion between joint got through sport's mechanism kinematics. In order meet need motion planning control are validated...