98results about How to "Many adjustable parameters" patented technology

The invention relates to a magnesium compound supported non-metallocene catalyst, which is obtained by directly contacting a compound of catalytic active metal and a magnesium compound containing a non-metallocene ligand through an in-situ supporting method. The preparation method for the magnesium compound supported non-metallocene catalyst has simple, feasible and flexible process, and has more adjustable parameters to the polymerization activity of the catalyst. When the supported non-metallocene catalyst and a catalyst promoter are adopted to form a catalytic system for the homopolymerization/copolymerization of olefins, the obtained polymer has high bulk density and low ash, and the molecular weight distribution of the polymer has wide adjustable range.

The invention discloses a control method on the basis of a discrete incremental distribution-order PI (proportion and integration) controller. The control method includes steps of 1), analyzing a distribution-order integrator in a time domain; 2), establishing a continuous mathematical model G (s) of a controlled object and analyzing the continuous mathematical model G (s) in a frequency domain; 3), establishing a distribution-order PI controller C(s) and analyzing the distribution-order PI controller C(s) in the frequency domain; 4), acquiring a system open-loop transfer function L(s)=G(s)XC(s) according to the steps 2) and 3), and then determining parameters of the controller according to design rules of the robust distribution-order PI controller; 5), digitally implementing the discrete incremental distribution-order PI controller; 6), enabling the distribution-order PI controller to perform self-adjusting; 7), operating a genetic algorithm on the distribution-order IC controller. The control method has the advantages that merits of a fraction-order method are inherited by a distribution-order operator of the control method, and the distribution-order operator has a large amount of unique characteristics.

The invention discloses a design method of a high-order modified eccentric circular gear and a non-circular gear pair conjugated with the high-order modified circular gear. There is no literature report on design and application research on a high-order modified eccentric circle-non-circular gear pair so far. The design method specifically comprises the following steps that firstly, a pitch curve equation of a high-order modified eccentric circle gear and a non-circular gear pair conjugated with the high-order modified eccentric circle gear is established, and a center distance is calculated through the numerical method; secondly, the concavity and convexity of a pitch curve are verified, the maximum modulus under the situation that undercutting is not carried out when a gear is machined through the gear shaping method is obtained, the pressure angle change range is calculated, the maximum pressure angle value is verified, and the contact ratio when the high-order modified eccentric circle gear and the non-circular gear pair conjugated with the high-order modified eccentric circle gear are meshed is calculated. According to the design method, a whole set of thorough design theoretical basis is provided for the high-order modified eccentric circle gear and the non-circular gear pair conjugated with the high-order modified eccentric circle gear in actual application, and the using and popularizing of the high-order modified eccentric circle gear and the non-circular gear pair conjugated with the high-order modified eccentric circle gear are promoted.

The invention discloses a device and a method for preparing directionally arranged fiber by a solution blow-spinning technology. The device comprises a solution blow-spinning system and a system for collecting fiber directionally arranged by airflow; the solution blow-spinning system comprises a spinning solution, an airflow control system and a blow-spinning device; the blow-spinning device, a spinning solution and the airflow control system are connected; a spinning collection system comprises a paving collection net; the paving collection net is connected with a negative pressure device; and the solution blow-spinning system collects directionally arranged nanometer fiber on the paving collection net by adjusting the angle of the spinning air flow and the paving collection net and by taking high-speed airflow as a directional driving force. The device and the method are relatively simple to operate, have many adjustable parameters and are high in precision; and the fiber obtained through preparation is high in arrangement degree, large in preparation quantity and high in uniformity.

The left hand microstrip transmission line (MTL), and time delay line based on the said MTL are produced from medium covered conductor plate. Capacitance is formed by two frames of plane cross fingers structures produced on conductor layer on up surface of medium plate. Moreover, via hole is prepared on outer cross finger or side strip on each plane cross fingers structure. Conductors on via holes connect capacitances to ground so as to constitute inductance. Ports of inputting and outputting signals of MTL are located at side strips on two ends of cross fingers capacitance. On plane carrier, the left hand MTL realizes series capacity and shunt inductance directly with features of compact structure, easy of manufacture, small size, low loss, and capability of applicable to microstrip IC. The MTL possesses symmetric structure, multiple adjustable parameters so as to suit requirements by different performances and different applications easily.

The invention discloses a vibrating screen with a vibrating screen surface and static screen box and aims to provide a vibrating screen which is low in energy consumption and foundation vibrating force and can be made in large size easily. The vibrating screen comprises a machine frame, a screen surface, a vibrating device and a transmission mechanism, wherein the transmission mechanism comprises a transmission rod, vibrating rods, rotating shafts, rotating shaft seats and a vibrating arm, wherein the vibrating device is connected with the transmission rods; the transmission rod is hinged with the vibrating rod, the vibrating rod is sleeved on the ends of the rotating shafts; the rotating shafts are arranged in the rotating shaft seats; at least two rotating shaft seats are arranged on each rotating shaft; the vibrating arms are arranged on the rotating shafts; the rotating shaft seats and the vibrating device are arranged on the machine frame; and the screen surface is fastened on the vibrating arms by bolts. The vibrating screen can be widely used in energy resource, metallurgical, ceramic, building material, chemical industries and other industries and mainly used for material grading and dehydration.

The invention relates to a wireless public network communication testing system and method for an acquisition terminal. An electromagnetic shielding darkroom is arranged in a testing box; a running track is arranged on a lower part in the electromagnetic shielding darkroom; a tray runs on the running track through a stepping motor; a tray jack is top-mounted on a lower bottom of the tray; the tray jack is driven by a docking motor; an acquisition terminal under test can be placed into the tray; a comprehensive tester and a signal interference device are fixedly arranged above the electromagnetic shielding darkroom; a coupling antenna is fixedly arranged at a top end of the electromagnetic shielding darkroom below the comprehensive tester; an alarm lamp and a display are arranged on the testing box; and an electrical unit, a PLC (Programmable Logic Controller) control unit, a power supply system and a control unit are also arranged in the testing box. The system consists of the electrical unit, a mechanical structural unit, a power supply system, a control unit, a docking unit, a jacking positioning unit and an automatic conveying unit. Through adoption of the wireless public network communication testing system and method, seamless coupling of an automatic assembly line is realized, and a precedent of realization of whole performance detection of a wireless public network communication module on the whole acquisition terminal is set.

The invention discloses an experiment table for a winding type mine hoist. One end of a traction steel wire rope (303) connected with a first tension sensor (304) is connected to one end of a movement platform (201), the other end of the traction steel wire rope (303) is wound on a driving winding drum (102), and a rotary coder (105) is arranged on the driving winding drum (102). One end of a load steel wire rope (601) connected with a second tension sensor (602) is connected with the other end of the movement platform (201), and the other end of the load steel wire rope (601) is wound on a load winding drum (401). Replaceable tank channels are arranged on the two sides of the movement platform (201). The experiment table further comprises a coding cable (801), and a coding cable antenna box (802), a carrier wave generator (803), an on-trolley communicator (804), a triaxial accelerometer and gyroscope (205), a signal collecting plate (202), a storage battery (203) and a balance weight (207) are arranged on the movement platform (201). The experiment table further comprises a control cabinet (701). The experiment table can complete various scientific researching and teaching experiments such as simulation operation of single-rope/double-rope winding and single-layer/double-layer row rope hoists and the dynamic influences on the moving states of lifted containers by unbalance loading, impact and applied loads.

The embodiment of the invention relates to the technical field of optics, and particularly relates to a grating structure, an optical waveguide and a near-to-eye display system. The embodiment of theinvention provides the grating structure which is applied to the optical waveguide and the near-to-eye display system. The grating structure comprises a grating body. A through hole is formed in the grating body, and compared with a cylindrical structure grating and a rhombus structure grating, the grating structure is more in adjustable parameters, high in design freedom degree and easy to adjustdiffraction efficiency of the grating so that the grating structure provided by the embodiment of the invention is better in diffraction efficiency.

The invention discloses a pyramidal dot matrix scatterer inclusion-type underwater sound absorption structure, including a plurality of cells, each cell is provided with a pyramidal dot matrix structure and scatterers, and a plurality of cells are arranged in an array mode to form the pyramidal dot matrix scatterer inclusion-type underwater sound absorption structure.According to the pyramidal dotmatrix scatterer inclusion-type underwater sound absorption structure, excellent mechanical properties and good underwater sound absorption properties are provided, in design more adjustable parameters, including structural parameters and material parameters, can be adjusted according to needs of actual working conditions, the structure is simple, and manufacture is easy.

The invention provides a method for analyzing sucrose ester in tobacco through multi-dimensional liquid chromatography-mass spectrometry. The method comprises the steps of adding an internal standardsample into a tobacco sample, adding a solvent, extracting, centrifuging and filtering to obtain a sample solution; and then, measuring the sample solution by adopting a two-dimensional liquid chromatography-mass spectrometry combination method, qualitatively determining the sucrose ester component and the internal standard sample in the sample solution by mass spectrometry, quantitatively determining the internal standard sample in the sample solution through a standard curve method, and determining the relative content of the sucrose ester component with the structure similar to that of theinternal standard sample determined quantitatively in the sample solution. The invention further provides a multi-dimensional liquid chromatography-mass spectrometry combined analysis system and a using method thereof. The method for analyzing the sucrose ester in the tobacco by the multi-dimensional liquid chromatography-mass spectrometry can effectively remove interfering substances which influence the quantification of the sucrose ester in the tobacco, has the characteristics of being high in accuracy, good in reproducibility and low in detection limit, the analysis can be automatically accomplished through an instrument, and the method is suitable for the batch detection of the tobacco sample.

The invention provides a spacecraft guaranteed-performance attitude control method independent of neural network approximation. The method comprises the following steps: 1, taking parameter uncertainty, unmodeled dynamics and external disturbance in a spacecraft mathematical model as total disturbance, and establishing a dynamic mathematical model and a kinematics mathematical model of a spacecraft attitude error control system according to the total disturbance; 2, introducing a preset performance function into the dynamic mathematical model and the kinematic mathematical model of the spacecraft attitude error control system to constrain steady-state and transient-state performance of an attitude loop tracking error of the spacecraft; and 3, designing a linear expansion high-gain observeraccording to the dynamic mathematical model and the kinematics mathematical model of the spacecraft attitude error control system, and obtaining the state and the total disturbance estimation value of the spacecraft attitude error control system. Under the condition of not depending on neural network estimation, tracking control over the spacecraft attitude is achieved, the requirements for stability and precision of attitude tracking are met, and good robustness is achieved.

The invention belongs to the technical field of hydraulic system detection or teaching facilities, and particularly relates to a hydraulic slide valve internal leakage acoustic emission detection experiment device and a using method thereof. The experiment device comprises a constant-pressure oil supply system, a leakage simulation device, an air-coupling acoustic emission sensor and a contact-type acoustic emission sensor; the constant-pressure oil supply system comprises a first oil tank, a hydraulic pump, a one-way valve, an energy accumulator and a ball valve which are sequentially connected through a pipeline; the experiment device further comprises a back pressure loading valve and an electromagnetic reversing valve with an inlet being connected to the back pressure loading valve; the leakage simulation device is connected through a pipeline and arranged between the ball valve and the back pressure loading valve; and the leakage simulation device comprises a plurality of valve elements, a plurality of valve bodies combined with the valve elements, a reset spring and a spiral micrometer head. The invention further provides the using method of the hydraulic slide valve internalleakage acoustic emission detection experiment device. Based on the device and the method, an analysis and verification experiment of internal leakage amount and leakage acoustic emission signal influence factors and a teaching experiment of leakage amount acoustic emission detection can be conveniently carried out.

The invention relates to an automatic welding method for a small-diameter thin-wall multi-layer pipe, which adopts automatic suspended arc welding (i.e. inert-gas arc welding). The automatic welding method comprises the following steps: by using pure tungsten or activated tungsten as an electrode, carrying out arc welding under the protection of inert gas; generating an arc between the end part of the tungsten electrode and a welded base material so as to carry out welding; and introducing argon gas for protection into the cavities of parts in the welding process, wherein the effective welding thickness is 0.7-1.1 millimeters; the effective welding length is 12-14 millimeters; the welding quality of the whole process can be ensured by dividing the whole welding process and adjusting the relevant parameter value of each section; the welding parameters are as follows: a positive rotation mode is adopted; the striking current is 9-11A, and the arc extinguishing current is 5-7A; the climbing time is 0.4-0.6 second, and the descending time is 2-3 seconds; and the welding process is divided into five sections. The invention has the following advantages: the automatic suspended arc welding is used instead of manual brazing; the X-ray inspection after welding shows that the welding qualified rate of pipe assemblies is increased to 90%; and the product quality is stabilized, the production cycle is shortened, and the processing cost is lowered.

The invention provides a damping lining hexagonal honeycomb perforated plate underwater sound absorption metamaterial. A plurality of honeycomb resonant cavity units are formed by welding or gluing aperforated upper panel, a honeycomb layer core and a lower panel, and damping lining layers are adhered to the side walls and the bottom surfaces of honeycomb resonant cavity units, so that the acoustic impedance characteristic of the structure is improved, and the low-frequency sound absorption performance of the structure is improved. According to the light honeycomb sandwich plate structure, onthe premise that good low-frequency underwater sound absorption performance is achieved, the weight of the structure is reduced, the bearing performance of the structure is guaranteed, and the problems that a traditional underwater sound absorption structure is generally poor in low-frequency sound absorption performance, heavy in weight and poor in bearing performance are solved.

The invention relates to a filler dripping device which comprises an accommodating tube, a magnetic piece, a first coil, a second coil and a control structure, wherein the accommodating tube is used for accommodating a filler; a filler outlet is formed in one end of the accommodating tube; the magnetic piece is accommodated in the filler of the accommodating tube; under the first state, the magnetic piece leaves the filler outlet and moves in the length direction of the accommodating tube to a first position; under the second state, the magnetic piece moves reversely from the first position toblock off the filler outlet; the first coil and the second coil are twined on the peripheral surface of the accommodating tube and are arranged at a preset distance in the length direction of the accommodating tube; the first coil is close to the filler outlet; the control structure is used for controlling the parameters of a magnetic field generated by the first coil and the second coil to switch over the magnetic piece between the first state and the second state; and the parameters comprise whether the first coil and the second coil are electrified or not, and/or the interval of the electrifying and outage switching time, and/or the current size of the first coil and the second coil under the electrifying state.

The invention discloses a bidirectional rough parallel arrangement micro-channel porous sound absorption structure, which is characterized in that a plurality of bidirectional rough micro-channels penetrating through the upper surface and the lower surface of an acoustic rigid framework plate are uniformly distributed in the acoustic rigid framework plate in parallel, the length direction of the bidirectional rough micro-channels is perpendicular to the plate surface of the acoustic rigid framework plate, the lower surface of the acoustic rigid framework plate is fixed to the surface of an object needing acoustic treatment, and a bidirectional rough parallel arrangement micro-channel porous sound absorption structure is formed. According to the invention, the bidirectional rough parallel arrangement micro-channel porous sound absorption structure has excellent sound absorption performance and good bearing capacity, the structure is light, thin and simple, and installation and use are convenient; and more adjustable parameters are provided in the design aspect, corresponding adjustment can be carried out according to the actual use condition, and efficient absorption of specific frequency noise is achieved.

The invention discloses a design method for transmission of a round-Fourier non-round-non-round three-wheel synchronous belt. The design method is characterized in that an active wheel is a conventional round synchronous belt wheel; a driven wheel is a Fourier synchronous belt wheel, and the output rule of the driven wheel depends on Fourier curve parameters of the driven wheel; and a tensioning wheel is a non-round synchronous belt wheel and plays a role in compensating synchronous-belt relaxation-amount change brought in the transmission process of the driving wheel and the driven wheel in real time. The design method comprises the following steps of: firstly establishing a pitch curve equation of the driving wheel and the driven wheel of the synchronous belt, and utilizing the cutting-pole coordinate theory to calculate the transmission ratio of the driving wheel and the driven wheel; and then calculating the circumference of the synchronous belt, and calculating all parameters of the pitch curve of the tensioning synchronous wheel by an iterative method according to the relaxation-amount change of the circumference of the synchronous belt. The design method disclosed by the invention has the advantages that a new transmission mechanism and a new design method are provided for realizing non-uniform-speed direct and accurate transmission with large center distance, and simultaneously the requirements for non-uniform-speed transmission and real-time tensioning are met.