66results about How to "Improve dynamics" patented technology

The invention belongs to the fields of material synthesis and energy technology, and especially relates to a graphene/metal oxide composite cathode material for lithium ion batteries and a preparation method thereof. Grapheme is dispersed into various metal oxide precursor salt solutions; a graphene/metal oxide compound is obtained directly by a hydrothermal method, or an graphene/metal oxide compound is obtained by a liquid in-situ polymerization method or a coprecipitation process; and the graphene/metal oxide compound is obtained by heat treatment or hydrothermal treatment. In the invention, the novel three-dimensional composite cathode material of graphene-coated metal oxide or graphene-anchored metal oxide is prepared by carrying metal oxide particles with graphene as a carrier. The obtained composite material can be used as a lithium ion battery cathode, which has a high specific capacity, excellent cycle stability and rate capability, and is expected to be used as a lithium ion battery cathode material with a high energy density and a high power density.

An electrically controlled and hydraulically driven vehicle with individual drive and brake of wheel and recovering braking energy has an engine and a hydraulic energy accumulator. Each wheel is equipped with a bidirectional hydraulic motor. Said engine are connected to hydraulic pump. Said hydraulic pump and each hydraulic motor are communicated to the hydraulic energy accumulator. Its electric control unit can receive the signals of different sensors and control engine and hydraulic motors. Its advantages include optical economic efficiency, recovering braking energy, reducing discharge of harmful substances, high performance, simple structure and low cost.

The invention discloses a robust distributed average tracking control method applied to cluster intelligent systems. The method comprises the following steps of S1, establishing a mathematic model ofa cluster intelligent system; S2, designing a mathematic model of a control capable of realizing the control for the cluster intelligent system; S3, carrying out stability analysis on the controller,if the control for the system is instable, returning to the step S2, and if the control for the system is stable, continuing to execute the next step; S4, designing parameters for the mathematic modelof the controller; and S5, substituting the controller parameters obtained in the step S4 into the mathematic model of the controller so as to complete the design. Under any initial conditions, the method is capable of tracking the average value of a plurality of nonlinear reference signals, so that the dynamic characteristics of the cluster intelligent system and the reference signals are greatly expanded; the dynamics of the cluster intelligent system and the reference signals are expanded from second order to common high-order nonlinear systems; and by utilizing robust control, the requirements for the initial information are removed, so that the method is more suitable for the field of engineering and is good in practicability.

The invention discloses a multivariate drilling time sequence prediction method based on a mixed leakage integral CRJ network. The method comprises the following steps of firstly, obtaining a time sequence data sample and performing data preprocessing on the data sample; secondly, selecting a high-correlation variable of a prediction variable as a network input by using a grey correlation algorithm; then, optimizing a traditional CRJ network model; combining a hybrid leakage integral neuron with stronger memorability mutually with a CRJ network to improve the dynamic characteristic and the prediction performance of the network; obtaining an optimal combination mode and an optimal leakage rate through a comparison experiment; constructing the mixed leakage integral CRJ network model based on an experiment result; and finally, using the trained mixed leakage integral CRJ network for carrying out time sequence prediction on the key variables of the drilling process. through the predictionresult, the change condition of the parameters are known in advance, and a corresponding adjustment strategy can be adopted in advance, and therefore it is ensured that drilling engineering is carried out safely and efficiently.

The invention relates to the technical field of communication, and particularly relates to a high performance channel simulator automatic control receiver and a verification device thereof. The receiver is characterized in that the receiver comprises a radio frequency variable attenuating unit, a broadband coupling unit, a radio frequency demodulation unit, a detection unit, an operational amplifier unit, a local oscillation unit and a main control unit; a storage unit is arranged in the main control unit which is used for storing the optimum power value corresponding to each frequency and controlling the detection unit and the local oscillation unit. Compared with the prior art, the receiver provided by the invention has the advantages that the receiver can automatically adjust the channel level without presetting receiving power; and the receiver is stable in the best working condition, and has the characteristics of wide frequency band, large dynamic state, automation, easy use, high accuracy and excellent marketing.

The invention discloses a numerical control machine tool kinematic chain design method considering a nonlinear error and a generalized modal. The method includes the steps of constructing a kinematicchain design and calculation model, with solving goals of minimizing a cumulative nonlinear error and minimizing the reciprocal of the generalized modal; generating a kinematic chain configuration population, for each kinematic chain configuration, calibrating a workpiece coordinate system, and subjecting cutter location data to the rotation transformation and the straight line transformation without travel constraints to obtain N groups of machine tool attitudes; determining whether the kinematic chain configuration matches the machine tool motion needed to realize the workpiece forming, andif not, carrying out the kinematic chain reconfiguration; calculating the generalized modal using a neural network model and calculating the cumulative nonlinear error using a differential method; andsolving the kinematic chain design and calculation model to obtain a Pareto solution set, and obtaining an optimal kinematic chain configuration by a TOPSIS method. The method of the invention overcomes the defects that a traditional kinematic chain design method relies on experience, only considers the forming characteristics of parts and has poor applicability, improves the kinematics and dynamics characteristics of a machine tool, and improves the machining accuracy of the machine tool.

The invention discloses a CNFs-loaded MoS2 novel magnesium-lithium double-salt battery positive electrode material and a construction method thereof. The CNFs account for x which is equal to 20-40wt%,and an MoS2 flower-shaped nano material accounts for 60-80wt%. The construction method comprises the steps: carbon fiber pretreatment, solution preparation, surfactant addition, PH value adjustment,hydrothermal synthesis and product collection; and finally, the one-step hydro-thermal synthesis of a final product is performed to generate a CNTs in-situ loaded MoS2 nano-composite material CNFs@MoS2. According to the invention, the capacity and the rate capability of the double-salt battery are improved, so that the cycle stability of a magnesium-lithium double-salt battery is improved, and theservice life of the battery is prolonged.

The invention discloses a MoSe2@EG magnesium-lithium double-salt ion battery positive electrode material and a construction method thereof. a layer of high-activity nanoflower-like two-dimensional nanomaterial MoS2 is loaded in situ on the surface of EG with good conductivity by one-step hydrothermal method, efficient saturated intercalation and de-intercalation of Li+ in the positive electrode material can be effectively promoted with the help of the high conductivity of EG and the high activity and layered structure characteristics of MoS2, and the capacity and rate characteristic of double-salt batteries are improved. In addition, MoSe2@EG can effectively alleviate a problem of material pulverization caused by volume expansion and contraction of the positive electrode material due to the intercalation and de-intercalation of Li+, thereby improving the cycle stability of the magnesium-lithium double-salt ion batteries, and prolonging the battery life.

The invention discloses a flat-convex engaged pure rolling mechanism for inside engaging transmission of parallel shafts and a design method of the flat-convex engaged pure rolling mechanism. The flat-convex engaged pure rolling mechanism consists of a pinion and a large gear ring of which the axes are parallel to each other; the cylindrical outer surface of the pinion is provided with helical trapezoidal grooves which are uniformly distributed; the cylindrical inner surface of the large gear ring is provided with helical circular arc teeth which are uniformly distributed; the helical circulararc teeth are matched with the helical trapezoidal grooves; the structures of the helical circular arc teeth and the helical trapezoidal grooves are determined by parameters such as an engaging lineparameter equation, the overlap ratio and the transmission ratio; in installation, the helical circular arc teeth are engaged with the helical trapezoidal grooves; and the pinion and the large gear ring are driven to rotate by a driver so as to realize transmission between the two shafts. The design method disclosed by the invention can be applied to the structural design of the pure rolling gearmechanism for the inside engaging transmission of the parallel shafts, has the advantages of being simple in design, easy in machining, high in transmission efficiency, large in overlap ratio, high inbearing capacity and the like, and is widely applied to the fields of tiny machinery, micro machinery and general machinery which are difficult to lubricate and designs of planetary gear transmission.

The invention provides a convex-concave meshing pure rolling spiral bevel gear mechanism for cross shaft transmission. The convex-flat meshing pure rolling spiral bevel gear mechanism comprises a small gear and a large gear, and the small gear and the large gear form a transmission pair. The small gear is fixedly connected with a drive through an input shaft, and the large gear is connected with an output shaft. The axis of the small gear intersects with the axis of the large wheel, and n1 uniformly distributed convex spiral circle-arc teeth are arranged on the outer surface of a cone of the small gear. The center lines of all the spiral circle-arc teeth are equal pitch conical spiral lines, and transitional fillets are arranged between the spiral circle-arc teeth and the outer surface ofthe cone of the small gear. n2 uniformly distributed spiral arc grooves are formed in the outer surface of a cone of the large gear, and the center lines of all the spiral arc grooves are equal pitchconical spiral lines. Transitional fillets are arranged between the spiral arc grooves and the outer surface of the cone of the large gear, and the engagement system of the spiral circle-arc teeth ofthe small gear and the spiral arc grooves of the large gear is pure rolling meshing transmission of point contact. The convex-flat meshing pure rolling spiral bevel gear mechanism for the cross shafttransmission has the beneficial effects that transmission efficiency is high, contact ratio is large, carrying capacity is high, and the convex-flat meshing pure rolling spiral bevel gear mechanism for the cross shaft transmission can be widely applied to the fields of small, micro machines and conventional machines which are not easy to lubricate.

The invention discloses a composite microemulsion cleaning agent which is an oil-in-water type composite microemulsion and comprises the following components: 3-4g/100ml of lauryl sodium sulfate, 6-8% of n-amyl alcohol in volume ratio, 1-7% of propylene carbonate in volume ratio and 1.5-11% of oil phase in volume ratio, wherein the oil phase comprises ethyl acetate or methylbenzene, dimethylbenzene, ethyl acetate and butyl ester in volume ratio of 39:11:11:39, or a mixture of n-butyl acetate, ethyl acetate and methylbenzene in volume ratio of 55:40:5. The invention also discloses a method for preparating the composite microemulsion cleaning agent. The composite microemulsion cleaning agent provided by the invention has the advantages of stable system, small collective, high trend, large interface, larger oil-water interface radius of curvature, safety, low toxicity, convenience in transportation and use and the like.

The invention discloses a potassium ion hybrid capacitor and a preparation method thereof. The potassium ion hybrid capacitor comprises a capacitance type positive electrode, a battery type negative electrode and an organic electrolyte, and the preparation method comprises the following steps: 1) the preparation of the capacitance type positive electrode, and preparation includes the preparation of a capacitance type positive electrode material, positive electrode mixing, coating and punching; 2) the preparation of a battery type negative electrode, the preparation includes the steps of preparing a battery type negative electrode material, mixing the negative electrode, coating and punching, 3) the preparation of the organic electrolyte, and 4) the assembly of the potassium ion hybrid capacitor, wherein the mass ratio of the positive electrode to the negative electrode is the optimal mass ratio obtained from different current densities, and the potassium ion hybrid capacitor has the characteristics of high energy density and high power density, and shows the application potential in the fields of braking devices, electric automobile energy supply, aerospace and the like.

The invention provides a flat-convex engaged pure rolling bevel gear mechanism for transmission of crossed shafts and a design method thereof. The flat-convex engaged pure rolling bevel gear mechanismfor transmission of the crossed shafts comprises a small wheel and a large wheel which form a pair of transmission pairs, wherein the axes of the small wheel and the large wheel are crossed; spiral trapezoidal slots are uniformly formed in the outer surface of the cone of the small wheel; spiral arc-shaped teeth are uniformly distributed on the outer surface of the cone of the large wheel; the structures of the spiral arc-shaped teeth and the spiral trapezoidal slots are jointly determined by a pure rolling engaging line parameter equation and a transmission ratio and the like, and the spiralarc-shaped teeth are matched with the spiral trapezoidal slots; when the large wheel and the small wheel are mounted, the spiral arc-shaped teeth and the spiral trapezoidal slots are engaged, and thesmall wheel and the large wheel are driven by a driver to rotate, so that transmission between two crossed shafts is achieved. The flat-convex engaged pure rolling bevel gear mechanism for transmission of crossed shafts provided by the invention can be used for a design of a pure rolling bevel gear mechanism for the crossed shafts, has the characteristics of being simple in design, easy to process, high in transmission efficiency, great in coincidence degree, high in bearing capacity and the like, and can be widely applied to the fields of small, micro and conventional machinery which is difficult to lubricate.

Disclosed is a drafting arrangement for a spinning machine, particularly a draft regulator, comprising at least two successive pairs of rollers, several electric motors (10, 20) for driving at least one respective roller (2, 3, 4) belonging to said roller pairs, and an electronic regulating ring (5) to which the electric motors (10, 20) are connected. The drafting arrangement is characterized in that an acceleration sensor (12, 22) is allocated to at least one electric motor (10, 20) and/or at least one roller (2, 3, 4).

The invention discloses a concave-convex meshing pure rolling bevel gear mechanism for cross shaft transmission and a design method thereof. The concave-convex meshing pure rolling bevel gear mechanism for the cross shaft transmission comprises a small gear and a large gear, and the small gear and the large gear form a transmission pair. The axis of the small gear intersects with the axis of the large wheel. Concave spiral arc grooves are uniformly formed in the outer surface of a cone of the small gear, and convex spiral circle-arc teeth are uniformly distributed on the outer surface of a cone of the large gear. The structures of the spiral circle-arc teeth and the spiral arc grooves are jointly determined by a pure rolling meshing line parameter equation and parameters such as contact ratio and transmission ratio, and the spiral circle-arc teeth are matched with the spiral arc grooves. The spiral circle-arc teeth mesh with the spiral arc grooves during the installation of the small gear and the large gear, and the small gear and the large gear are driven by a drive to rotate to realize the transmission between two cross shafts. The concave-convex meshing pure rolling bevel gear mechanism for the cross shaft transmission and the design method thereof can be used for the design of the pure rolling bevel gear mechanism of the cross shafts, have the advantages of simple design, easy processing, high transmission efficiency, large contact ratio, high bearing capacity and the like, and can be widely applied to the fields of small, micro machines and conventional machines whichare not easy to lubricate.

The invention provides a convex-convex engaged pure rolling helical bevel gear mechanism for cross shaft transmission. The convex-convex engaged pure rolling helical bevel gear mechanism comprises a pinion and a main gear which form a transmission pair; the pinion is fixedly connected with a driver through an input shaft; the main gear is connected with an output shaft; the axis of the pinion is intersected with the axis of the main gear; the conical outer surface of the pinion is provided with n1 helical circular arc teeth which are distributed uniformly; the center lines of all helical circular arc teeth all are equal-lift conical helical lines; a transition fillet is arranged between the helical circular arc teeth and the conical outer surface of the pinion; the conical outer surface ofthe main gear is provided with n2 helical circular arc teeth which are distributed uniformly; the center lines of all helical circular arc teeth all are equal-lift conical helical lines; a transitionfillet is arranged between the helical circular arc teeth and the conical outer surface of the main gear; and the helical circular arc teeth of the pinion and the helical circular arc teeth of the main gear are engaged in a point-contact pure rolling engagement transmission manner. The convex-convex engaged pure rolling helical bevel gear mechanism provided by the invention has the beneficial effects of being high in transmission efficiency, large in overlap ratio, high in bearing capacity and widely applied to the fields of tiny machinery, micro machinery and general machinery which are difficult to lubricate.

The invention relates to a preparation method of a sodion energy storage graphene/sodium titanate non-woven fabric material. The method comprises the following steps of: placing sodium titanate powderin graphene oxide/N,N-dimethyl formamide solution (GO/DMF) to obtain graphene oxide/sodium titanate/N,N-dimethyl formamide solution; injecting the obtained mixed solution into curing solution by an automatic injection machine at a uniform injection speed of 2 to 20ml/h, carrying out spinning according to a non-woven fabric structure, and drying an obtained graphene oxide/sodium titanate non-wovenfabric which is finally spun to have 2 to 10 layers at the room temperature; and then carrying out heat preservation in a container with hydrazine hydrate and finally, obtaining the graphene/sodium titanate non-woven fabric. According to the invention, the prepared graphene/sodium titanate non-woven fabric material is excellent in electrochemical performance, high in yield, low in price, convenient for industrial application, simple in synthesis method, non-toxic and harmless, and has the enormous potential in future portable and wearable energy storage products.

The invention discloses a high-voltage pulse electric field treatment device for accelerating releasing of formaldehyde in a nartificial wood board. The high-voltage pulse electric field treatment device comprises a strong pulse electric field treatment chamber. A high-voltage electrode used for generating a strong pulse electric field and a low-voltage electrode are arranged in the strong pulse electric field treatment chamber. A high-voltage pulse power source is used for supplying electricity to the high-voltage electrode, which generates the strong pulse electric field, in the strong pulse electric field treatment chamber. The output voltage of the high-voltage pulse power source is adjustable so that the strong pulse electric field with the adjustable electric field intensity ranging from 10 kV/cm to 100 kV/cm is formed between the high-voltage electrode and the low-voltage electrode. The to-be-treated board is placed between the high-voltage electrode and the low-voltage electrode. According to the high-voltage pulse electric field treatment device for accelerating releasing of the formaldehyde in the artificial wood board, releasing of the free formaldehyde in the artificial wood board can be accelerated within relatively-short time, accelerated decomposing and releasing of unstable groups in an adhesive are promoted, and therefore the content and the releasing amount of the formaldehyde of the board are reduced, and the environment-friendliness grade and additional value of the board are improved.