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41 results about "Control saturation" patented technology

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Undisturbed soil sample expansion force testing device capable of controlling saturation

The invention discloses an undisturbed soil sample expansion force testing device capable of controlling the saturation. The device comprises a base supporting system, wherein a lower disc is fixed on the base supporting system, a cutting ring base and a cutting ring are arranged on the lower disc, and the upper part of the cutting ring base is provided with an upper cover; a central circular groove and an annular groove are formed on the lower disc, a soil pressure sensor is arranged in the central circular groove, an annular water penetration plate is arranged in the annular groove, water-immersion circular grooves are formed on the annular water penetration plate, water-permeable stones are uniformly placed in the water-immersion circular grooves, and the bottom of the annular groove is connected with an external water injection system through a pipeline; a soil sample is placed between the lower disc and the cutting ring, and a water-permeable plate base which is provided with a water-permeable plate and water-permeable holes is arranged on the top of the soil sample; and a plunger, overflow equipment and vacuum extraction equipment are arranged on the upper cover. The device effectively solves the problems that testing devices for an expansion back pressure method, a pressurization expansion method and a balance pressurization method have relatively large disturbance on soil sample structures, cannot effectively control strict saturation states and are relatively long in testing time consumption.
Owner:XIAN UNIV OF TECH

Device for adjusting and controlling dissolved gas saturation in water under different pressure intensities

PendingCN107621433ADissolved gas saturation controlCalculate SaturationSurface/boundary effectControl saturationWater storage tank
The invention discloses a device for adjusting and controlling dissolved gas saturation in water under different pressure intensities. The device comprises a closed water storage tank, a liquid circulation module, a test observation module, a pressure module, a dissolved gas concentration measurement module, a gas circulation module and a water tank height adjusting module, the liquid circulationmodule provides circulation liquid for the closed water storage tank, the test observation module comprises a test table for placing samples, the test observation module is connected with the water storage tank and the liquid circulation module, the pressure module is used for measuring and adjusting gas pressure intensity and arranged at the top of the closed water storage tank, the dissolved gasconcentration measurement module is used for measuring the oxygen content in liquid in the closed water storage tank, and the gas circulation module is connected with the top and the bottom of the closed water storage tank through pipelines, so that air of the top of the closed water storage tank is pumped into liquid of the bottom of the water storage tank. According to the device, the dissolvedgas saturation in the water is adjusted and controlled, gas pressure intensity of the upper portion of the water surface is adjusted by the pressure module, relative liquid level and relative heightof the samples are adjusted by the water tank height adjusting module, and the device controls saturation states to keep stable or change.
Owner:PEKING UNIV

Multifunctional stimulating device for soil vibrating and liquefying as well as pile foundation liquefying resisting functions

PendingCN108797655AChange saturationAchieve the purpose of repeating the demonstrationFoundation testingControl saturationMovable type
The invention discloses a multifunctional stimulating device for soil vibrating and liquefying as well as pile foundation liquefying resisting functions. The stimulating device comprises a sand box stimulating device part, a telescopic pile foundation stimulating and controlling device part, different vibrating load loading device parts and a movable type pore water increasing-reducing device part. The movable type pore water increasing device controls saturation degree of water-containing sandy soil in the sand box through a water adding or reducing way, different vibrating load loading devices can apply different types of vibrating load, and vibrating and liquefying phenomena under different saturation degrees and different vibrating load of the water-containing sandy soil can be observed. The length of a variable pile foundation buried in the water-containing sandy soil is controlled, so that a tilting condition of a short pile foundation while the saturated soil is liquefied, and action, in resisting soil liquefying, of the long pile foundation can be observed. The device has the advantages of being multifunctional, easy to operate, repeatable, and visual in display, and is suitable for displaying the soil vibrating and liquefying as well as pile foundation liquefying resisting functions in the civil engineering field.
Owner:YELLOW RIVER CONSERVANCY TECHN INST

A Method for Suppressing Specified Subharmonic Current of Multiphase Induction Motor

The invention relates to a multi-phase induction motor-specific subharmonic current suppression method, which includes the following steps: (A) current reference value processing; (B) current feedback value processing; (C) current regulation; (D) voltage reference value determination. Based on the vector control of a multi-phase induction motor, the method maps the current of the multi-phase motor into a corresponding synchronous rotating reference frame of a fundamental wave and each subharmonic orthogonal to each other by multiple synchronous rotating coordinate transformations, and uses proportional-integral controllers to respectively carry out tracking with zero steady-state error and combine to form an integral current controller. The method has the advantages that trapezoidal integration is adopted to increase integral accuracy, and supplemented by variable structure control, appropriate self-adaptive compensation is introduced to resist control saturation, so that static and dynamic performance is further enhanced; the method can suppress motor loss caused by the harmful subharmonic current of the multi-phase motor and the adverse affection of torque ripple, vibration noise and the like, and can utilize the positive effect of usable subharmonic; the method takes full advantage of the multi-phase motor, and enhances system performance.
Owner:中国船舶重工集团公司第七一二研究所

A self-storage multi-terminal flexible straight system control method and system

The invention discloses a control method and system for a self-storage multi-terminal flexible straight system. The system controller is designed by using the reverse push method to realize the stability of the DC voltage and the rapid independent control of the active and reactive power. At the same time, a constraint command filter is introduced to solve the problem. The differential expansion and control saturation problems of reverse push control, and design compensation signals to solve the error problem of the filter, introduce adaptive control to ensure the robustness of the system to uncertain parameters, and use projection operators to optimize adaptive uncertain parameters , the control law of the system is designed based on the Lyapunov stability theory, which improves the anti-interference ability of the system and realizes the asymptotic stability of the whole system. Finally, a simulation model was built in the simulation software, and compared with the traditional PID control algorithm and the command filtering back-calculation algorithm, the simulation results show that the control method of the present invention has better robustness and dynamic response performance, and is a self-storage multi-terminal flexible The control algorithm of the straight system provides theoretical basis and technical support.
Owner:STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +4

Undisturbed soil sample expansion force testing device capable of controlling saturation

The invention discloses an undisturbed soil sample expansion force testing device capable of controlling the saturation. The device comprises a base supporting system, wherein a lower disc is fixed on the base supporting system, a cutting ring base and a cutting ring are arranged on the lower disc, and the upper part of the cutting ring base is provided with an upper cover; a central circular groove and an annular groove are formed on the lower disc, a soil pressure sensor is arranged in the central circular groove, an annular water penetration plate is arranged in the annular groove, water-immersion circular grooves are formed on the annular water penetration plate, water-permeable stones are uniformly placed in the water-immersion circular grooves, and the bottom of the annular groove is connected with an external water injection system through a pipeline; a soil sample is placed between the lower disc and the cutting ring, and a water-permeable plate base which is provided with a water-permeable plate and water-permeable holes is arranged on the top of the soil sample; and a plunger, overflow equipment and vacuum extraction equipment are arranged on the upper cover. The device effectively solves the problems that testing devices for an expansion back pressure method, a pressurization expansion method and a balance pressurization method have relatively large disturbance on soil sample structures, cannot effectively control strict saturation states and are relatively long in testing time consumption.
Owner:XIAN UNIV OF TECH
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