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199results about How to "Resistance to influence" patented technology

Hybrid finite time control method for quadrotor accurate trajectory tracking

The invention provides a hybrid finite time control method for quadrotor accurate trajectory tracking. The method comprises the steps: establishing a kinematic model and a dynamical model of a quad-rotor unmanned aerial vehicle; designing a vertical control law of the vertical motion according to a height tracking error of the quadrotor unmanned aerial vehicle and an adaptive integral sliding surface design; on the basis of a horizontal position tracking error of the quadrotor unmanned aerial vehicle, designing a horizontal control law of the horizontal motion based on a backstepping method; and designing a finite time disturbance observer based on the attitude angle of quadrotor unmanned aerial vehicle and designing a precise attitude stability control law by combining a non-singular terminal sliding-mode control law and the finite time disturbance observer. According to the invention, the quad-rotor is classified into three subsystems of the height, horizontal position and attitude and three kinds of control strategies are designed respectively; and on the basis of the hybrid control scheme, the trajectory tracking error is stabilized rapidly. The accurate trajectory tracking ofthe quadrotor can be realized under the condition that the unknown model parameters and the external disturbance are allowed; and the manipulation is more flexible.
Owner:DALIAN MARITIME UNIVERSITY

Double-wire differential-type magnetostrictive displacement sensor

The invention provides a double-wire differential-type magnetostrictive displacement sensor, relates to the technical field of sensors, and solves the technical problem of improving detection accuracy. A framework, a fixed block, signal generation assemblies and a measuring circuit are arranged in a casing of the sensor, wherein the framework and the fixed block are fixed at two ends of the inner wall of the casing respectively. The sensor is characterized in that: two sets of signal generation assemblies are provided; each set of the signal generation assemblies comprises a waveguide wire, an induction coil and a shielding device; one end of each waveguide wire is a near end and the other end of each waveguide wire is a far end; the near ends of two waveguide wires are arranged in two bores of the framework respectively, and the far ends of the two waveguide wires are arranged on the fixed block and connected to each other through a connection lead; the axial lines of the two waveguide wires are parallel to each other; two induction coils are coaxially wound at the peripheries of the two bores on the framework respectively and connected to the measuring circuit after being in series-opposing connection; and two shielding devices are coaxially sleeved at the peripheries of the induction coils of the assemblies respectively. The sensor provided by the invention has high detection accuracy.
Owner:SHANGHAI RUNIWILL AUTOMATION TECH

Foam water-drainage agent and its aqueous solution

The invention discloses a foam water-drainage agent and its aqueous solution, and belongs to the technical field of the oilfield chemical engineering. The foam water-drainage agent is composed of 50-80 parts by weight of a Sapindus mukurossi Gaertn extract, 20-40 parts of fatty alcohol polyoxyethylene ether AEO18, 1-5 parts by weight of polyacrylamide and 5-10 parts by weight of triethanolamine. The foam water-drainage agent has the characteristics of strong foaming capability after meeting water, good foam stability, and high liquid carrying capability and high mineralization resistance of foams, and is suitable for the use in natural gas wells containing gas condensate and having a high mineralization and a large water output; the foam water-drainage agent has a foam stability of 170mm, has a foam water content of not more than 2.0%, has a mineralization resistance of 250g/L, has a gas condensate resistance of 30%, has a temperature resistance of 90DEG C, is non-toxic, is easy to degrade, and does not pollute the environment; and the foam water-drainage agent has the advantages of compatibility with chemicals comprising methanol, a corrosion inhibitor, a scale inhibitor and the like, no chemical reaction with gas or liquid components, no increase to the toxicities of gases or combustion products, and no corrosion to equipment or pipelines.
Owner:CHINA PETROLEUM & CHEM CORP +1

Mode-locked fiber laser and pulse laser generation method

The invention provides a mode-locked fiber laser and a pulse laser generation method, and belongs to the field of a fiber laser. The mode-locked fiber laser comprises a pumped source and a mode-locked laser resonator, and the mode-locked laser resonator comprises a reflection part, a gain fiber, a polarization-maintaining filter and a saturable absorption mirror which are successively coupled, wherein the saturable absorption mirror is used for mode locking. Pump light emitted by the pumped source penetrates into the gain fiber to generate signal light, the signal light penetrates into the saturable absorption mirror after being processed into signal light in a preset polarization direction and within a preset wavelength scope by the polarization-maintaining filter and returns to the polarization-maintaining filter after mode locking of the saturable absorption mirror, the signal light returning to the polarization-maintaining filter re-penetrates into the gain fiber and is input to the reflection part after being amplified by the gain fiber, and the portion, which meets the transmission condition of the reflection part, in the signal light amplified by the gain fiber is output. Compared to a conventional mode-locked fiber laser, the mode-locked fiber laser provided by the invention is simple in structure and high in stability and reliability, thereby facilitating engineering application.
Owner:LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS

Low-noise magnetostrictive displacement sensor

The invention discloses a low-noise magnetostrictive displacement sensor, relating to the technical field of sensors and aiming to solve the technical problem of improving the detection precision. The sensor comprises a casing and a magnet assembly; a framework, a fixed block, a waveguide wire, a coil assembly, a shielding device and a measuring circuit are arranged in the casing; the framework and the fixed block are respectively fixed at two ends of the inner wall of the casing; the framework is provided with an inner hole; the near end of the waveguide wire is arranged in the inner hole of the framework and the far end of the waveguide wire is arranged on the fixed block; and the coil assembly and the shielding device are sleeved on the periphery of the inner hole of the framework. The low-noise magnetostrictive displacement sensor is characterized in that the shielding device is a circular permanent magnet; a ferromagnetic protective sleeve is sleeved on the periphery of the shielding device; the coil assembly is a differential coil which consists of two circular windings; and the two circular windings have the same specification, size and turn number as well as opposite winding direction of windings. The sensor has favorable noise reduction effect and can improve the detection precision.
Owner:SHANGHAI RUNIWILL AUTOMATION TECH

Online automatic control method for dual direction-changing side paddles of lake and reservoir workboat

ActiveCN106950960AFlexible motion controlEfficient sailingPosition/course control in two dimensionsStable stateAutomatic control
The invention discloses an online automatic control method for dual direction-changing side paddles of a lake and reservoir workboat. The workboat mainly comprises a boat body, side paddles, a propeller and a monitoring system. The monitoring system comprises a control unit, a navigation unit, an obstacle avoidance unit, a wind-wave monitoring unit, a wireless communication module and a power supply system. The method comprises the steps of setting a sailing path of the workboat; detecting the working state of the workboat; controlling the moving state of the workboat; performing adjustment on deviation of the workboat from the sailing path; performing adjustment on obstacle avoidance of the workboat; and keeping a stable state of the workboat at a target point. According to the invention, the propeller and dual side paddles capable of adjusting the speed in direction changing are used, and the control unit is utilized to control the direction and the rotating speed, so that efficient sailing of the workboat in various moving modes is realized. Meanwhile, the working state of the workboat is monitored by using a sensor, so that the flexibility of motion control for the workboat is enhanced, influences imposed on the workboat by wind and water flow are effectively resisted, and the workboat is enabled to keep stable at the target point under interference of wind and waves.
Owner:DALIAN UNIV OF TECH

Network storm suppression method in intelligent transformer station process layer communication

The invention discloses a network storm suppression method in intelligent transformer station process layer communication. Port flow is detected in real time via a switch operating a network monitoring service, and when flow reaches a threshold value, processing is performed by adopting a storm processing method. When damage to a network card of user terminal communication equipment is detected, a separating method is adopted via the switch operating the network monitoring service. When a looped network or protocol fault is detected, a blocking method is adopted via the switch operating the remote network monitoring service. When the situation that flow surpasses the specified threshold value is detected, a suppression method is adopted via the switch operating the remote network monitoring service. When a fault occurs on the switch, processing is performed via a device storm isolation blocking mechanism of an adjacent switch via a detection task operated by the switch. Permanent separation, blocking with the designated length of time and flow speed limit are performed on a communication port, or the aforementioned motions are applied in combination so that effective suppression of intelligent transformer station process layer network storm is realized.
Owner:NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD

Wide-temperature heat control device

The invention relates to a wide-temperature heat control device, and belongs to the technical field of electrical equipment. The combination of a phase-change material and a heat transfer technique is adopted for the device provided by the invention. The wide-temperature heat control device mainly comprises an outer shell, a heat insulating layer, an inner shell, a phase-change heat conducting cushion, a heat conducting block, a composite organic phase-change material, a heat diode and a heat radiating fin. A pure physical way is adopted for the device provided by the invention to carry out heat control; the addition of extra equipment (a fan, a heating wire and the like) is not needed; the addition of extra energy is not needed; the problem of the non-mandatory heat radiation of electronic equipment in a wide-temperature environment can be solved. The device provided by the invention is typically applied to an explosive environment; mandatory heat control measures of an axial fan, the heating wire and the like are inappropriately adopted in the explosive environment, as a potential safety hazard is possibly generated in a failure condition; however, the wide-temperature heat control device provided by the invention has no an extra heat load, is high in reliability, has no the potential safety hazard, and can be used for resisting the influences of a high temperature and a low temperature of a large-space environment on the electronic equipment.
Owner:北京中安科创科技发展有限公司
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