475results about How to "Improve dynamic stability" patented technology

The present invention relates to a posterior vertebral joint prosthesis. The left or right posterior vertebral joint prosthesis of the invention presents a smooth bearing surface and said surface presents antero-posterior curvature.

A lithium ion electrochemical cell having high charge / discharge capacity, long cycle life and exhibiting a reduced first cycle irreversible capacity, is described. The stated benefits are realized by the addition of at least one phosphonate additive to an electrolyte comprising an alkali metal salt dissolved in a solvent mixture that includes ethylene carbonate, dimethyl carbonate, ethylmethyl carbonate and diethyl carbonate. The preferred additive is an alkyl phosphonate compound.

A lithium ion electrochemical cell having high charge / discharge capacity, long cycle life and exhibiting a reduced first cycle irreversible capacity, is described. The stated benefits are realized by the addition of at least one phosphate additive to an electrolyte comprising an alkali metal salt dissolved in a solvent mixture that includes ethylene carbonate, dimethyl carbonate, ethylmethyl carbonate and diethyl carbonate. The preferred additive is an alkyl phosphate compound.

A spinal dynamic stabilization device for maintaining an anatomical height between two adjacent vertebras is provided. Each vertebra includes a spinous process and two symmetric pedicles. The spinal dynamic stabilization device includes a supporting member, at least one anchoring member, and at least one connecting member. The supporting member is disposed between the spinous processes. The anchoring member is fixed in one of the vertebra via one of the pedicles. The connecting member connects the supporting member to the anchoring member, fixing a relative position between the supporting member and the anchoring member, further fixing a relative position between the vertebras.

A lithium ion electrochemical cell having high charge / discharge capacity, long cycle life and exhibiting a reduced first cycle irreversible capacity, is described. The stated benefits are realized by the addition of at least one nitrate additive to an electrolyte comprising an alkali metal salt dissolved in a solvent mixture that includes ethylene carbonate, dimethyl carbonate, ethylmethyl carbonate and diethyl carbonate. The preferred additive is an organic alkyl nitrate compound.

A lithium ion electrochemical cell having high charge / discharge capacity, long cycle life and exhibiting a reduced first cycle irreversible capacity, is described. The stated benefits are realized by the addition of at least one nitrite additive to an electrolyte comprising an alkali metal salt dissolved in a solvent mixture that includes ethylene carbonate, dimethyl carbonate, ethylmethyl carbonate and diethyl carbonate. The preferred additive is an alkyl nitrite compound.

A posterior vertebral joint prosthesis is provided so that the left or right posterior vertebral joint prosthesis (1, 2) presents a smooth bearing surface (11, 11a, 11b, 17, 17a, 17b) and and which surface presents antero-posterior curvature.

The present invention comprises a multilayered heel construction for footwear. A fluid-filled bladder is incorporated into the heel of footwear. The bladder defines an internal cavity which is adapted to enclose a fluid at atmospheric pressure. The internal cavity defines a peripheral channel adjacent the periphery of the bladder and a plurality of intersecting channels orientated transversely to the longitudinal axis of the footwear. The intersecting channels are in communication with the peripheral channel of the interior cavity. The bladder is positioned at the heel of the footwear and is positioned intermediate an upper footbed support. The lower surface of the multilayered heel assembly defines a concave, cantilever surface. The combination of the bladder, the upper footbed support and the lower cantilever surface improve shock absorption and the stability of the footwear.

A lithium ion electrochemical cell having high charge / discharge capacity, long cycle life and exhibiting a reduced first cycle irreversible capacity, is described. The stated benefits are realized by the addition of at least one dicarbonate additive to an electrolyte comprising an alkali metal salt dissolved in a solvent mixture that includes ethylene carbonate, dimethyl carbonate, ethylmethyl carbonate and diethyl carbonate. The preferred additive is an alkyl dicarbonate compound.

The invention discloses a microgrid transient adaptive parameter control strategy based on VSG, belonging to the field of microgrid frequency control. The invention comprises the following steps: a dynamic model of a microgrid system based on VSG is constructed; The virtual inertial torque and virtual damping factor of the system model are controlled adaptively. The stability of the system energyfunction is evaluated. Matlab / simulink software is used to simulate and analyze the numerical example. By analyzing the frequency oscillation process, the method of the invention establishes the dynamic relationship between the system inertia and the system frequency offset, and changes the virtual inertia factor in real time according to the frequency change, thereby effectively suppressing the frequency oscillation, enabling the system to better cope with the transient disturbance and providing the system frequency stability.

A lithium ion electrochemical cell having high charge / discharge capacity, long cycle life and exhibiting a reduced first cycle irreversible capacity, is described. The stated benefits are realized by the addition of at least one carbonate additive to an electrolyte comprising an alkali metal salt dissolved in a solvent mixture including ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate and diethyl carbonate. The preferred additive is either a linear or cyclic carbonate containing covalent O-X and O-Y bonds on opposite sides of a carbonyl group wherein at least one of the O-X and the O-Y bonds has a dissociation energy less than about 80 kcal / mole.

The invention relates to a human gait acquisition and analysis system and method based on inertial sensor information integration. The system comprises at least two IMU (Inertial Measurement Unit) sensors, two triaxial accelerometer sensors, a controller and an upper computer, wherein the two same IMU sensors are installed on a thigh and a shank of at least one side of a human body, are enabled to be coaxially and equidirectionally placed at outer side positions of the thigh and the shank, and are used for transmitting sensed accelerated speed and angular speed information of the thigh segment and the shank segment to the controller; the two same accelerometer sensors are coaxially and equidirectionally placed on a strip-shaped steel plate; an x-axis direction of a sensitive axis of each sensor is enabled to be parallel to the long edge of the steel plate, and a y-axis direction of the sensitive axis of each sensor is enabled to be parallel to the short edge of the steel plate; the strip-shaped steel plate is installed at the center position of a back of a waist part; the long edge of the steel plate is enabled to be parallel to a direction of a human spine, and the distance between the installation position to a hip joint rotary shaft is recorded; the accelerometer sensors are used for sensing the accelerated speed information of the human waist spine direction and transmitting to the controller; the controller and the upper computer accomplish classification of different gaits and carries out gait predication.

The invention relates to a data drive control method for minimum energy consumption of a refrigerating system on basis of SPSA. The method includes the steps of adjusting frequency of a compressor to enable chilled water supply water temperature to be constant according to changes of a system load so that refrigerating capacity can be matched with a thermal load; obtaining a relation curve between the system load and the minimum stable superheat degree of an evaporator; establishing an online neural network identification model of the system; calculating the system load according to changes of refrigerating capacity of the refrigerating system of an air conditioner under dynamic regulation of the compressor, obtaining the minimum stable superheat degree corresponding to the system load according to the relation curve between the system load and the minimum stable superheat degree of the evaporator, and using the minimum stable superheat degree as a set value of the superheat degree of the evaporator; establishing a neural network controller; completing control over the superheat degree of the evaporator through an expansion valve control loop. The method is easy to calculate and implement, the number of parameters is small, and the control effect is good.

The invention discloses a VSG based photovoltaic microgrid dynamic frequency stability control method. The method includes the following steps: constructing a VSG based photovoltaic microgrid system dynamic model; performing adaptive control on the virtual inertia torque and virtual damping factors of the system model; configurating system key parameters, and selecting the optimal value of the parameters; and determining a calculation example, and adopting a simulation tool to perform simulation analysis on the calculation example. The method can establish the dynamic relation between the virtual inertia and virtual damping of a system and the frequency change of the system through the analysis on a frequency oscillation process, so that the two can be adaptively changed according to the frequency change, and therefore, frequency oscillation can be effectively inhibited, the system can better cope with transient disturbances, and the frequency stability of the system can be provided.

The invention discloses a high-modulus bituminous mixture additive and a preparation method thereof. The high-modulus bituminous mixture additive is composed of a modifying main agent, butadiene styrene rubber, polyethylene paraffin, a filling material, an anti-aging component, and a plasticizing component according to a mass percentage of 100:(10-30):(15-40):(40-80):(2-6):(5-20); wherein the modifying main agent consists of one or more components selected from waste PE, polypropylene, and EVA. The preparation method comprises the following steps: evenly mixing the modifying main agent, butadiene styrene rubber and polyethylene paraffin at a temperature of 160 to 190 DEG C, adding the filling material, anti-aging component and plasticizing component into the mixture, evenly mixing under a certain rotation speed, then extruding the mixture by a screw extruder, cooling at the room temperature, and finally cutting into particles. The high-modulus bituminous mixture additive is mainly applied to pavement projects such as new construction and reconstruction of high grade roads and heavy traffic roads, can improve the dynamic stability, static modulus, dynamic modulus and shearing resistant performance of bituminous mixture, thus prominently reduces the damages of rut, displacement, or the like, and can improve the low-temperature anti-cracking performance of high-modulus bituminous mixture at the same time.

The invention discloses a laser diode driver for an optical communication transmitter. The laser diode driver comprises an input shaping circuit, a laser diode modulated current control circuit which is provided with a modulated current switch and is connected with the output end of the input shaping circuit and a to-be-driven laser diode, a laser diode bias current control circuit which is provided with a bias current switch and is connected with the laser diode, a photoelectric switching circuit, a peak detection circuit in direct-current coupling with the photoelectric switching circuit to carry out quick detection of electric signals output by the photoelectric switching circuit to output a detection signal and a differential comparison amplifying circuit in direct-current coupling with the peak detection circuit, wherein the output end of the differential comparison amplifying circuit is connected with the laser diode modulated current control circuit and the laser diode bias current control circuit to form a negative feedback loop. The laser diode driver has the advantages that the driver is suitable for transmitting both burst signals and random balanced signal flows.

The invention relates to a high-rigidity nine-lever and two-freedom degree controllable mechanical loading mechanism, which comprises a machine frame, a movable arm control branched chain and a bucket control branched chain, wherein the movable arm control branched chain is controlled by a first driving lever and is used for elevating a movable arm; the bucket control branched chain is controlled by a second driving lever and is used for turning a bucket. The mechanical loading mechanism can complete loading and unloading operation by means of the interaction of the movable arm elevating branched chain and the bucket control branched chain. According to the mechanical loading mechanism, all the levers are connected through revolute pairs, and thereby the defects of high cost, low reliability, high maintenance cost and the like of the conventional full hydraulic loading mechanism with sliding pairs are overcome. Moreover, compared with other controllable loading mechanisms, the mechanical loading mechanism has the advantages of compact structure, high rigidity, and novel structure with superior kinematic and dynamic performance, and thereby the loading mechanism is higher in reliability and dynamic stability.

The invention relates to a variable-performance radial bearing formed by controllable tilting pads and a bearing pad. The variable-performance radial bearing consists of nine controllable tilting pads and one bearing pad. The bearing pad is a fixed pad and is arranged at the bottom of the bearing. The nine controllable tilting pads are distributed in three rows along an axial direction at equal distances and are distributed in three lines along a circumferential direction at equal angles. Each controllable tilting pad comprises a controller and a tilting pad. The variable-performance radial bearing formed by the controllable tilting pads and the bearing pad has the beneficial effects that the radial position of the tilting pads can be changed by rotating a controller adjusting screw, the dynamic characteristic of the bearing can be changed and the dynamic characteristic coefficient of the bearing can be recognized; since the bearing is longer than a common bearing, the situations that a rotor tilts and deflects when the rotor is supported by a single bearing can be effectively avoided by controlling the radial position of the tilting pads at two ends; by controlling the nine tiling pads in a combined way, various loading ways can be simulated and the bearing performance similar to bearings such as elliptical bearings can be generated; the variable-working-condition adaptability of the bearing and the power stability of a bearing-rotor system are improved.

The invention provides a reconfigurable device for a walking robot with four / two parallel legs, belonging to the technical field of robots. The leg mechanism of the robot is structurally designed in a modularization way, and the legs are of a same structure. When four-leg walking is carried out, the leg mechanism is a 3-UPU, and when two-leg walking is carried out, the leg mechanism is a 3-SPU (Synergistic Processing Unit), wherein the conversion between the two leg mechanisms is realized through a rotation-pair retaining device, and the conversion between four legs and two legs is realized through a merging device. The rotation-pair retaining device comprises an electromagnet, an electromagnetic chuck base, friction plates, a friction plate carrier, a support column, a spring and a rotation-pair retaining plate, a rotation pair in a pair S is controlled to be locked and unlocked through the lamination and the separation of the friction plates, and the lamination and the separation of the friction plates are controlled by the sucker type electromagnet. The merging device comprises an electromagnetic chuck, a guiding device, a push-pull type electromagnet and a locking clamp, and the merging device is locked by controlling the positions of two legs to be merged, merging the soles through the electromagnetic chuck and the guiding device, and driving the locking clamp to act by the push-pull type electromagnet.

The invention relates to a system control method for a dynamic reactive power compensation device and belongs to the technical field of grid safety and stable control of a power system. The method includes: according to voltage and current of the dynamic reactive power compensation device accessed to the power transmission grid, switching states of parallel compensation equipment in a substation and manual setup of operators, quickly calculating reactive power requirement values of each functional mode of the dynamic reactive power compensation device, and determining which output of the functional modes can be selected by the dynamic reactive power compensation device to serve as reactive power reference instruction values. The method has the advantages of distinct control structure, simplicity in implementation and the like and overcomes the defect of single control function of a traditional control method. In addition, the control method can be applied to stable control of the power system, and voltage stability and dynamic stability of the power transmission grid can be improved.

The invention discloses a control method for large wind field reactive-load compensation equipment in low voltage ride through. The control method comprises the follow steps that firstly, information of voltage, current, power and frequency in a power grid is sampled through coordination control of an automatic voltage control system, fault points are detected, and when draught fan low voltage ride through starts, a static var generator is rapidly started to provide reactive power; secondly, compensation capacity of various types of reactive-load compensation equipment is determined according to different installation places and effects of the reactive-load compensation equipment and different principles; thirdly, the static var generator respectively achieves the reactive compensation work state and the harmonic suppression work state by using different control strategies; fourthly, the automatic voltage control system starts a thyristor switched capacitor when power voltage is equal to pre-charged voltage of the thyristor switched capacitor; fifthly, the automatic voltage control system starts a thyristor controlled reactor according to reactive gap information; the fourth step and the fifth step are in parallel with each other.

A lithium ion electrochemical cell having high charge / discharge capacity, long cycle life and exhibiting a reduced first cycle irreversible capacity, is described. The stated benefits are realized by the addition of at least one carbonate additive to an electrolyte comprising an alkali metal salt dissolved in a solvent mixture that includes ethylene carbonate and an equilibrated mixture of dimethyl carbonate, ethylmethyl carbonate and diethyl carbonate. The preferred additive is either a linear or cyclic carbonate containing covalent O-X and O-Y bonds on opposite sides of a carbonyl group wherein at least one of the O-X and the O-Y bonds has a dissociation energy less than about 80 kcal / mole.

The mixed magnetic air journal bearing is mixed bearing of active magnetically suspension bearing and dynamic pressure air journal bearing, and includes active magnetically suspension radial bearing, elastic foil embedded between magnetic poles of the magnetically suspension radial bearing, and locking mechanism comprising locking wedge block, inclined blocks, bearing block, gag, screw and stop washer. The elastic foil with pre-wedged angle, has one end held onto the magnetic pole and has higher static and dynamic performance than rigid bearing. Owing to the magnetic force to suspend the rotor in the balance position and fluid force to deform the foil for coupling the interval of the air film, the rotor-bearing reaches ultimate stable balance. The bearing has simple structure, has the advantages of both active magnetically suspension bearing and foil bearing, excellent damping characteristic and improved structure rigidity and dynamic characteristic.

A method and apparatus for interfacing the motion of a user-manipulable object with an electrical or computer system includes a user object physically contacted by a user. A gimbal mechanism is coupled to the user object, such as a joystick or a medical tool, and provides at least two degrees of freedom to the user object. The gimbal mechanism preferably includes multiple members, at least two of which are formed as a unitary member which provides flex between the selected members. An actuator applies a force along a degree of freedom to the user object in response to electrical signals produced by the computer system. A sensor detects a position of the user object along the degree of freedom and outputs sensor signals to the computer system. Another embodiment includes a host computer system and a local microprocessor, separate from the host computer, for communicating with the host computer and controlling the forces output by the actuators according to a processor subroutine selected in accordance with a host command, sensor signals, and timing information. Another embodiment of the interface apparatus uses voice coil actuators that produce forces in either linear or rotary degrees of freedom using currents applied in a magnetic fields. A friction drive mechanism of the present invention can be coupled between an actuator and a gimbal mechanism. Force from the actuator is transmitted to the gimbal mechanism through frictional contact of members of the friction drive mechanism.

The invention discloses an automatic material weighing method for a mine excavator. Rotating angles of all components are obtained through measurement of an angle sensor, real-time positions of all the components are calculated, then the kinematics parameters such as the speed and the accelerated speed of all the components are calculated through differential, the pressure of a big cavity and the pressure of a small cavity of an oil cylinder are measured through a pressure sensor, the real-time thrust pressure of the oil cylinder is calculated to obtain force parameters, kinematics equilibrium equations of all the components of the working device are set up by using the Alembert principle, the kinematics parameters and the force parameters are substituted into the equations, an equation set is solved in a simultaneous mode to obtain the total mass of materials and a bucket, the mass of the bucket is subtracted from the total mass to obtain the mass of the materials, the mass center of the materials is corrected according to the calculation results, the material density and the stacking state, and the accurate mass of the materials is finally obtained through iterative calculation. According to the automatic material weighing method for the mine excavator, calculation is performed according to the Alembert principle, the influence on measurement by various factors such as surface slope and rotation is considered, and therefore the automatic material weighing method has the advantages of being high in calculation accuracy and dynamic stability.

An asphalt composition comprising 0.5 to 50 parts by weight of a block copolymer component (I), 100 parts by weight of an asphalt (II) and 0.01 to 10 parts by weight of at least one vulcanizing agent (III) selected from the group consisting of sulfur and a sulfur-containing compound, wherein the block copolymer component (I) comprises at least one modified block copolymer comprising an unhydrogenated or hydrogenated base block copolymer comprising at least one vinyl aromatic polymer block (A) and at least one conjugated diene polymer block (B), and a functional group-containing modifier group bonded to the base block copolymer.

The invention provides a wearable inertial device human body gait information acquisition and calculation method, and relates to the field of exoskeleton gait rule information acquisition. The methodincludes the following steps that (1), four accelerometers and two IMUs are installed on one leg of the human body; (2), a first knee joint angle is calculated according to a thigh pitch angle and a shank pitch angle; (3), a second knee joint angle is calculated according to a thigh inclination angle and a shank inclination angle; (4), a first human body thigh IMU coordinate system and a second shank IMU coordinate system are established; (5), a relation equation of the first knee joint angle and the second knee joint angle is established; (6), Kalman filtering calculation is carried out, anda knee joint angle error and a knee joint angle obtained after compensation are obtained. Real-time non-contact measurement of human body gait information is achieved, accurate knee joint angle information is acquired, and in combination with basic human body information acquired at the beginning, information such as the step length, the step frequency and the leg lifting height in the human bodywalking process is calculated.

The invention relates to flame retarding type fillings, in particular to flame retarding type fillings special for a tunnel asphalt road surface. The invention is characterized in that the fillings comprises limestone powder, flame retarding substance and modified substance with the weight ratio of 100:60 to 120:70 to 150, wherein, the flame retarding substance consists of aluminium hydroxides, magnesium hydrates, boron flame retardants and synergists with the weight ratio of 100:60 to 85:4 to 15:2 to 6. The synergist is Fe oxidant, Sb2O3, MgO or MoO3. The modified substance comprises lime hydrate, diatomite and natural zeolite powder with the weight ratio of 100:60 to 80:15 to 30. The invention has the advantages of high flame retarding efficiency, nontoxic operation, effective usage for improving the properties of asphalt mixed material, etc. when being used on roads.