88results about How to "Eliminate Stability Issues" patented technology

This invention relates to high voltage circuit current measurement optical inductor and its test method, wherein, the sensor head is of bar magnetic materials along line distribution input fiber; the basic path is composed of self focus lens, bias device, optical sensor head, test bias device, parallel output self focus lens and fiber and vertical output focus lens and fiber. The test current passes through ring conductor to establish parallel magnetic field with at least one basic light path. The multiple light paths each sensor head is of same distance separately connected to low voltage two photoelectricity converters to output voltage signal and vertical voltage to compute test current.

A control system for an articulated manipulator arm (1), the manipulator arm having at least three degrees of freedom, said control system comprising a master controller (10) moveable to replicate the at least three degrees of freedom of the manipulator arm (1); means for determining the rate of movement of the master controller in each direction replicating a degree of freedom of the manipulator arm; and control means (200) for controlling actuation of the manipulator arm whereby the rate of movement of the manipulator arm in each of said at least three degrees of freedom is proportional to the rate of movement of the master controller (10) in each direction replicating a degree of freedom of the manipulator arm.

The invention relates to a cable fixing device, which comprises an adjustable mounting rack capable of adjusting high, low, front and rear positions of cable fixing clamps and at least one cable fixing clamp which is fixedly arranged on the adjustable mounting rack, wherein each cable fixing clamp comprises a clamping seat used for clamping a cable through a locking device after the alignment of the cable and a clamping cover; clamping through slots for clamping the cable are formed in the clamping seats; hollow cavities are respectively formed in two side walls of the clamping through slots; clamping bulges which can be inserted into the corresponding hollow cavities when the clamping covers and the clamping seats are aligned are arranged on aligned end faces of the clamping covers; and cable clamping surfaces on the clamping bulges and the clamping through slots on the clamping seats form cable clamping space of which the size is changed along with change of the alignment depth of the clamping covers and the clamping seats. By the cable fixing device, the stress of mechanical fastening on the cable can be reduced, the cable mounting reliability is improved, faults of cable heads are reduced, and the same cable fixing clamp can be matched with cables of different wire diameters. The invention also relates to a cable fixing clamp.

The invention relates to a fixed platform which enables to locate on the water any fixed structure such as the house, garden, road, airport, car park, children's park and holiday village in the seas, lakes and rivers. Our invention comprises the platform (7) where the floats (22) thereof capable of floating are submerged up to a safe zone 3-5 m from the water (10) surface, the floats (22) spending energy to come out on the water surface (5) produce forces to try to maintain the platform (7) always at the same point owing to the tightness of the ropes (3) of the floats (22) and where said platform (7) is prevented from being drifted by the violent storms and huge waves and the currents in the sea, wherein the platform (7) which is manufactured in a manner suitable for its purpose comprises the weight (4) to the end of which the ropes (3) are connected, the connecting ropes (3) serving to maintain the floats (22) at a constant distance from the floor and in submerged state, the floats (22) producing the buoyancy carried over by the platform (7), the carrier columns (21) connecting the floats (22) with the platform (7) and the connecting pieces (20) that connect the columns (21) with the platform (7).

The invention discloses a method and device for demodulating a distributed optical fiber vibration sensing system. The method comprises that two continuous ultra-narrow linewidth lasers with the sameoptical power are subjected to acousto-optic modulation and electro-optic modulation to be converted into two pulsed light signals; the two pulsed light signals are input into a sensing fiber at an interval of set pulse width; the backward Rayleigh scattered light of the two pulsed light signals generate a set frequency difference such that the returned Rayleigh light signals exhibit sinusoidal interference fringes; when a disturbance signal has an effect on the sensing fiber, the phase difference of the returned Rayleigh light signals changes, and the vibration waveform and position sensed bythe sensing fiber are obtained according to the phase difference. When the disturbance signal appears, a detector can quickly obtain the position of the disturbance signal and the intensity of the disturbance signal, which solves the problem that the demodulation algorithm of a [phi]-OTDR system is complex and a laser frequency drifts, and guarantees that the positioning error of the system is within +/-1m.

The invention belongs to the technical field of petrochemical industry, and particularly relates to a method and an apparatus for high-efficient crude oil desalination / dehydration by a combined filtration-electric field coalescence method. The apparatus for high-efficient crude oil desalination / dehydration of the invention comprises a raw material conveying system, a mixing device, a dehydration filtration device, and an electrical desalting device which are connected in order. The method for high-efficient crude oil desalination / dehydration of the invention is realized by using the apparatus for high-efficient crude oil desalination / dehydration of the invention and through the steps of raw material preheating, mixing, preliminary demulsification, and electrical desalination / dehydration. The invention adopts a combined filtration-electric field coalescence method for crude oil desalination / dehydration, which can overcome respective disadvantages of performing desalination / dehydration process by a filtration method or an electric field coalescence method, decrease running severity of both the two methods, not only improves the adaptability of the crude oil desalination process, the desalination / dehydration rate, and the stable running rate, but also reaches the purposes of energy saving and consumption reduction.

The invention discloses an aerated concrete block which is prepared from a cementing material, an additive and water by adopting an autoclaving-free process. The cementing material mainly comprises the following raw materials: steel slag, mineral slag and cement. The invention also discloses a preparation process of the aerated concrete block. The preparation process comprises the following steps:a, selecting steel slag, quick lime, gypsum, fly ash, cement, slag, aluminum powder paste, sodium sulfate, a foam stabilizer, water glass and sodium hydroxide as raw materials; b, carrying out dry mixing on the cementing material to prepare a mixture; c, adding water into the aluminum powder paste, the foam stabilizer and a curing agent to prepare a suspension; d, dissolving water glass and sodium hydroxide into water, and carrying out uniform mixing under stirring; e, pouring a solution obtained in the step d into the mixture obtained in the step b to obtain slurry; f, adding the obtained suspension into the slurry, and carrying out stirring to form paste; g, pouring the paste into a mold, carrying out casting molding, performing demolding after pre-curing, and carrying out hot and wet maintenance on a demolded green body to obtain the finished block. The block prepared by the autoclaving-free preparation process has the advantage of high compressive strength.

The invention discloses a glass plate combining apparatus, which comprises at least two glass plate conveying mechanisms, and the combining apparatus uses a mode that the glass plate conveyed by a conveying mechanism is send out and then automatically dropped on the another conveying mechanism to automatically assemble the glass plates conveyed by each conveying mechanism together. The combining apparatus realizes the automatic assembly of glass plates before sealing, so that the problems of large labor intensity of workers and poor quality stability of glass plate combination can be eliminated, the combination efficiency of the multi-sheet can be enhanced and the condition of the high efficiency production for the multilayer structure glass member can be created.

A computer controlled plating apparatus is composed of an optical film thickness monitor system consisting of light source and emitting system, monitor chip, signal receiver system and phase-locked amplifier, the computer with control program consisting of parameter setting-up module and data processing module, crystal controller, and barrier switch controller.

The invention discloses a biological agent for promoting osteogenic differentiation of bone marrow mesenchymal stem cells (BM-MSC), and a pharmaceutical composition for prevention and/or treatment ofadolescent idiopathic scoliosis (AIS). The inventor finds that lncAIS is key lncRNA involved in progress of AIS, wherein the lncAIS interacts with NF90 to promote HOXD8mRNA stability, thus transcription of RUNX2 in the BM-MSC is enhanced, and thus osteogenic differentiation of the normal BM-MSC is caused. By contrast, the NF90 cannot be collected due to down-regulating of the lncAIS in the BM-MSCof an AIS patient , thus the HOXD8mRNA stability is eliminated, and in this way, transcription of the RUNX2 for osteogenic differentiation is hindered. Thus, the BM-MSC of overexpression lncAIS, HOXD8or the RUNX2 can be used for preparing the biological agent for promoting osteogenic differentiation of the BM-MSC and the pharmaceutical composition for prevention and/or treatment of the AIS, and thus the new means is provided for prevention and/or treatment of the AIS.

The invention discloses an SDFT fundamental positive sequence component phase synchronization method and a phase synchronization system. The method comprises steps: analog signals for three-phase power grid AC voltage are discretized, discrete data are obtained through sampling in a fixed period, Clark transform is carried out on the discrete data, and transform data are obtained; according to a sampling sequence and an overlapped period, single-point DFT calculation is carried out on the transform data to obtain a correction result for an ith point, wherein the correction result for the ith point is the accumulated value between the DFT calculation result for the ith point and the correction result for an (i-1)th point; N-point recursive SDFT calculation is carried out on the transform data in the fixed period to obtain a calculation result in the current period; when i is smaller than N, the calculation result in the current period is outputted; when i is equal to N, the correction result for the ith point serves as the calculation result in the current period to be outputted; according to the calculation result outputted in the current period, an arc-tangent function is used for acquiring a fundamental positive sequence component phase angle. Thus, the problem of stability caused by recursive iterative cumulative errors can be eliminated.

The invention discloses a constant-pressure control device and method for a hydraulic pump. An oil inlet of a fine filter is communicated with an oil discharge port of the hydraulic pump, an oil outlet of the fine filter is communicated with a constant-pressure control valve port P and a rodless cavity of a small variable piston at the same time, a constant-pressure control valve port A is communicated with a shock reducing valve port P, a constant-pressure control valve port T is communicated with a shock reducing valve port T and an oil tank at the same time, a constant-pressure control valve control port is communicated with the constant-pressure control valve port P through internal fixing damping, and a shock reducing valve port A is communicated with a rodless cavity of a large variable piston; a feedback rod is fixedly connected with the small variable piston, so that when pressure at the oil discharge port of the hydraulic pump is higher than pressure set by a proportional spring of a constant-pressure control valve, the feedback rod can be driven by the small variable piston to move to contact with a valve spool of a shock reducing valve and push the valve spool to move to the communicating station of the shock reducing valve port P and the shock reducing valve port T; when pressure at the oil discharge port of the hydraulic pump is lower than pressure set by the proportional spring of the constant-pressure control valve, the feedback rod can be separated from the valve spool of the shock reducing valve.

The invention discloses a disturbance observation suppression method for the direct-current component of the output voltage of a photovoltaic grid-connected inverter. The method includes the followingsteps that: S1, the output voltage amplitude and phase angle reference instruction of the inverter are calculated according to virtual synchronous machine control or droop control, and the componentof a voltage reference value is calculated; S2, the filter capacitor voltage and filter inductor current data of the inverter are collected, a voltage loop/current loop model is established; S3, a generalized controlled object model is established, the filter capacitor voltage data of the inverter are collected, and a disturbance observer is adopted to estimate a direct-current voltage disturbancequantity; S4, a direct-current voltage disturbance estimation value is compensated to modulation voltage signals through feedforward compensation, so that an improved voltage loop/current loop control structure is formed, and the effective suppression of the direct-current component of the output voltage of the inverter is realized. The method has the advantages of parameter design simple, convenient operation, convenience in engineering realization, good suppression effect and high stability. With the method adopted, conventional voltage feedback control and outer loop voltage following performance are not affected.

The invention discloses a light-duty prefabricated sea island living cabin. The living cabin is shaped like a cylinder, a sphere or a combination thereof, and the inside of the living cabin is composed of a central column, a steel beam, a ring beam and surrounding columns. The main steel frame structure, the connection mode between the central column, steel beam, ring beam and surrounding columns is bolt connection; the central column is a hollow structure, and the main steel frame structure of the living cabin and the inner and outer wall panels are anti-corrosion light quality composite panels. The curved surface shape of the house of the present invention eliminates the adverse effects of the large wind pressure gradient at the eaves and corners of the traditional square building on the stability and wind resistance of the building, and can make the stress of each part of the house more uniform, so that the wind resistance of the building can be significantly improved Performance, and effectively resist the harsh climate environment on the island and natural disasters such as typhoons. The curved surface anti-corrosion light-weight composite plate used in the house of the invention can effectively prevent the erosion of sea salt spray and the damage of high-temperature, high-humidity and strong-wind environment.

A reactive power, unbalanced and harmonic detection method based on SDFT algorithm is as follows: three-phase alternating current signals are sampled at a fixed sampling period to obtain discrete sampling data; a zero sequence component is obtained, and meanwhile a result of removing the zero sequence component is obtained; SDFT conversion is carried out on the sampling data, and the integral result of each current flow under the fundamental wave period point is obtained; according to the calculation formula of DFT, the integral value of each current flow is corrected, and the result of the SDFT operation is replaced; a fundamental wave reactive power and unbalanced component is obtained according to a calculation formula in combination with a power grid voltage phase locking result, and the instantaneous value of the harmonic component can be obtained according to the phase relation; the rotation factor is obtained through a look-up method, only a sine value table is stored, and the memory usage can be reduced; and the stability problem caused by iteration accumulation errors can be eliminated.

The invention discloses a compound active equalization circuit based on an FPGA architecture, comprising a battery pack, a battery information acquisition circuit, an equalization circuit, and an FPGA module. The output end of the battery pack is connected with the input end of the battery information acquisition circuit. The output end of the battery information acquisition circuit is connected with the input end of the equalization circuit through the FPGA module. The output end of the equalization circuit is connected with the input end of the battery pack. Compared with the prior art, as the compound equalization circuit is composed of a DC-DC equalization active circuit and a PWM control converter active circuit based on an FPGA architecture, the energy efficiency of batteries is improved, and the hardware cost is reduced greatly. Compared with a passive equalization method, an active equalization method avoids the waste of energy obviously, and avoids heat produced in the process of passive equalization (discharge). Thus, the safety of the system is improved.

The invention discloses a suction fixing and magnetic fixing combined vehicle navigation instrument. The suction fixing and magnetic fixing combined vehicle navigation instrument comprises a navigation instrument body, a suction plate and a support rod assembly. The support rod assembly comprises a vertical rod, an iron bracket, a clip, a permanent magnet block and a permanent magnet sleeve. The suction plate comprises a suction plate body, a ring-shaped seal ring, an elastic exhaust plate, a connecting rod, a cam and an O-shaped seal ring. When the suction fixing and magnetic fixing combined vehicle navigation instrument is used, the navigation instrument body is connected through the clip, and the positions of the navigation instrument body and the iron bracket are fixed through the permanent magnet block and the permanent magnet sleeve, so that the navigation instrument body is easily disassemble, assemble and adjusted in angular position to facilitate the use; and meanwhile, the suction plate is used for fixing through suction, the ring-shaped seal ring can further enhance the suction force of the suction plate, and the O-shaped seal ring can prevent the air from flowing into an arc-shaped recess in reverse, so that the suction fixing and magnetic fixing combined vehicle navigation instrument is high in suction fixing capacity and solves the problem that an existing suction fixing and magnetic fixing combined vehicle navigation instrument is poor in suction stability and easy to fall.

An online full-redundancy mass and mass center measurement device based on an upper weighing sensor and a lower weighing sensor arranged in a vertical mirror image mode comprises a scale pan, weighing units which surround the scale pan and are of the same structure, two weighing sensor signal collection circuits independent of each other and a data processing and displaying system. The weighing units comprises the pair of weighing sensors, a support, a base and a support height adjustment block, wherein the weighing units are suitable for vertical mirror image positioning and installation, the base is used for fixing the support, the upper weighing sensor in the pair of weighing sensors is arranged on the scale pan, the lower weighing sensor in the pair of weighing sensors is arranged on the support, the scale pan and the support are respectively provided with standard pins and positioning pin holes, the standard pins and the positioning pin holes are used for installation of the upper weighing sensor and the lower weighing sensor, the weighing sensors are coupled together through force bearing coupling parts in a line or face tight contact mode, and the force bearing coupling part is restrained in the stable position and the stable state through force measurement parts or force measurement part transition connecting parts of the weighing sensors.

The invention discloses a car navigator bracket. The car navigator bracket comprises a sucker and a support rod component, the sucker comprises a sucker body, an annular sealing ring, an elastic exhaust plate, a connecting bar, a cam, a handle and an O-shaped sealing ring, under the sucker detachment state, the O-shaped sealing ring is located below a connecting bar hole, and under the sucker adsorption state, the O-shaped sealing ring has seal fit with the connecting bar hole. When working, the cam pushes the elastic exhaust plate to move towards the upside so as to discharge the air in an arc-shaped cavity from the connecting bar hole, the sucker is compressed on a windshield of the car or an instrument panel shell under the atmosphere pressure effect, and the annular sealing ring further reinforces the adsorption force of the sucker; the seal fit between the O-shaped sealing ring and connecting bar hole can prevent the air reversely flowing into the arc-shaped cavity so as to further improve the adsorption ability of the sucker. The car navigator bracket is strong in adsorption fixing ability and eliminates the problems of bad adsorption stability and easiness in falling of an existing car navigator bracket.

The invention discloses an anisotropic structure thermal-mechanical coupling multi-objective topological optimization method based on a meshless EFGM and a parameterized level set method. The method comprises the following steps: (1) inputting a Poisson's ratio factor, a thermal conductivity factor, a material direction angle and other material attributes of an anisotropic structure, and carrying out the discrete design of a domain through meshless nodes; (2) initializing a level set function of the meshless nodes; (3) interpolating a level set function by adopting a radial basis function in combination with the parameterized level set method; (4) solving a displacement field and a temperature field of the anisotropic structure based on meshless EFGM; (5) based on meshless EFGM and PLSM theories, establishing a mathematical model for thermal coupling multi-target topological optimization of the anisotropic structure; (6) inputting a termination condition, and judging whether an optimization loop is converged or not; (7) calculating a normal velocity field of a structure boundary; (8) programming, solving and optimizing the model, and updating the level set function. According to the method, thermal-mechanical coupling multi-target topological optimization of the anisotropic structure is carried out based on the meshless EFGM and PLSM, the calculation efficiency is high, the boundary of the topological structure is clear and smooth, and the method is simple and practical.