114results about How to "Solving Design Challenges" patented technology

The invention discloses a low RCS wide-bandwidth angle-sweep phased array antenna based on a strong mutual coupling effect. The antenna comprises a radiation unit layer printed on a thin dielectric layer, and capacitive coupling between adjacent units is reinforced via an interdigital at the tail end of a dipole along the direction of a dipole arm in the radiation unit layer; and a multilayer impedance transformation Balun structure is used to feed the dipole. Thus, requirements of ultra wide band, wide-angle wave beam scanning and low RCS for the phased array antenna are all taken into consideration, and the low RCS wide-bandwidth angle-sweep phased array antenna is especially suitable for use in a new generation of hidden carrier platform.

The invention discloses an output coupling and filter circuit for power line carrier communication, and the circuit is used for coupling the output signals of a power amplifier in the carrier communication system to the power distribution line. A first serial resonant tank is connected with a power amplifier. The first serial resonant tank is harmonic with the center frequency of the carrier signals. An isolation transformator is provided with a first winding, a second winding and a third winding. The first winding is connected with the first serial resonant tank. The second winding is connected with the power distribution line. A shunt-resonant circuit and a switching element are connected with the two terminals of the third winding in parallel after the shunt-resonant circuit and the switching element are connected in series. The switching element is turned on or off under the control of a control signal so as to control the disconnection or connection of the shunt-resonant circuit and the third winding.

The invention discloses a multilayered ceramics antenna, which includes: cascade body, including the multi parcel shape ceramics medium layer cascaded together along the cascade dirtection; spirality conductor, including the strip, the L conductor design which set in the each cascade body; the multi electrode which set on the cascade body side surface; the outer electrode, which set on the two terminal surfaces of the cascade body; signal infan marking, which set on the position of cascade body surface near feeding end. This invention beneficial effect: the invention through set the spiralityconductor on the LTCC (low temperature altogether burns ceramics) the laminated ceramics medium layer, has solved the descend generation mobile and small mobile design difficult problem which brings because of the design space more and more narrowness.

The invention discloses a large-space saddle-shaped overall greening roof system. The large-space saddle-shaped overall greening roof system comprises a saddle-shaped reinforced concrete thin-shell structure panel with grid-type reversed beam ribs and a roof greening plantation construction, wherein the saddle-shaped reinforced concrete thin-shell structure panel with the grid-type reversed beam ribs comprises a saddle-shaped shell plate and the grid-type reversed beam ribs which are convexly arranged on the upper surface of the shell plate; the shell plate is a standard single-piece doubly-inclined hyperbolic paraboloid torsional shell; an edge beam is arranged at the edge of the shell plate; the shell plate and the grid-type reversed beam ribs are reinforced in a unified manner and are formed by synchronous overall type pouring; the roof greening plantation construction consists of a waterproof layer, a root puncturing resistance layer, a protection layer, a water drainage layer, a water retention layer, a filter layer, a soil layer and a plant layer which sequentially covers the shell plate and the grid-type reversed beam ribs from bottom to top; a water seepage pipe is arranged on the protection layer along the edge of a plantation groove. According to the large-space saddle-shaped overall greening roof system, the conflict between a large-span space structure and a roof greening load is effectively overcome, and a roof system which is most ecological and energy-saving is created for a large-space building.

The invention provides a clamping absorption integrated circuit for a two-stage matrix converter, which is arranged between the P pole and the N pole of a rectification grade output direct-current bus. The circuit comprises a particular structure that: the positive pole of a diode D is connected with the P pole; an electrolytic capacitor Ce, a high-frequency capacitor C and a voltage bleeder circuit which formed by connecting R1 and R2 in series are connected in parallel between the negative pole of the diode D and the N pole of the rectification grade output direct-current bus; an input end of a hysteresis comparator is connected to a node connecting the R1 and R2, and the output end thereof is connected with the grid of IGBT through a drive resistor Rg; the grid of the IGBT is connected to the N pole through a pull-down resistor; the source of the IGBT is connected with the N pole; and the drain of the IGBT is connected with the negative pole of the diode D through a discharge power resistor RD. The circuit can effectively inhibit invert stage instant overvoltage, can protect overvoltage of the direct current bus, and has the advantages of simple and compact structure and low power consumption and cost.

The invention relates to a functionalized wide-width implanted microelectrode array, a manufacturing method and an application thereof. The functionalized wide-width microelectrode array comprises a functional layer, a base layer, a conducting layer and an insulating layer which are successively arranged. The functional layer is a monomolecular layer, a polymer material layer and/or a polymer compound layer, and has the thickness of 1 nm to 1000 micron. The invention also provides the manufacturing method of the functionalized wide-width implanted microelectrode array. By using the functionalized wide-width microelectrode array, through increasing the size of a microelectrode, a microelectrode bit point, a line, a spacing and other correlation parameters can be effectively adjusted so as to reduce a technology complexity during a microelectrode micro-machining process and greatly increase the yield of a high-cost microelectrode array, and the design problem of a high-density microelectrode array is solved; and through a functionalized wide-width design, a microelectrode array folding or curling function can be realized so as to realize minimally invasive implantation and greatly reduce an operation risk.

The invention provides a high-speed laser device driving circuit which involves an input buffer stage, a signal amplification stage, an output driving stage, a laser device current source and a directly modulated laser device. The output driving stage comprises an output amplifier and a transistor, the output end of the input buffer stage is connected with the input end of the signal amplification stage, the output end of the signal amplification stage is connected with the input end of the output amplifier, the output end of the output amplifier is connected with the transistor, the transistor is a BJT transistor or an MOSFET transistor, only one laser device current source is arranged, and the laser device current source is connected between a power supply and the anode of the directly modulated laser device or connected between the cathode of the directly modulated laser device and the ground. The high-speed laser device driving circuit can be used for directly driving high-speed distributed feedback laser devices and others, and the design difficulty of an existing high-speed directly modulated laser device driving circuit is reduced.

The invention relates to a large-slenderness-ratio orbit-control lateral jet-flow force test structure comprising a jet pipe block, a main model body, a five-component balance component, an outer balance locking nut, a variable rigidity air-supply pipeline, and a support system. The jet pipe block is used for stabilizing an airflow of an orbit-control lateral jet flow and simulating an orbit-control jet flow. The main model body has a structure with a hollow cavity. The five-component balance component is installed in the hollow cavity of the main model body; one end, approaching the front endof the five-component balance component, of the hollow cavity sleeves the jet pipe block and is fixed; and the rear end of the five-component balance component is supported and fixed by the support system. The five-component balance component and the support system have hollow structures. The variable rigidity air-supply pipeline is installed in the hollow structures; the variable rigidity air-supply pipeline in the hollow structure of the main model body employs a rigid air supply pipeline; one end of the pipeline is connected with a gas inlet of the jet pipe block and the other end is connected with one end of a non-metallic hose; and the other end of the non-metallic hose is connected with the support system fixedly by another rigid air supply pipeline.

The invention discloses a double-stator single-rotor rare earth permanent magnet motor, which relates to the technical field of motors, in particular to a low-voltage high-power rare earth permanent magnet motor. The motor provided by the invention has two stators and a rotor. The rotor is positioned between the two stators. Armature windings are embedded into wire embedding slots of special rotor cores. A plurality of rare earth magnetic steels are embedded into magnetic conducting rings of the rotor, and provide a multipole magnetic field for air gaps on a left side and a right side. A starting winding and a damping winding are arranged in the rotor. Each stator can drive the rotor to rotate. The two stators can be loaded both simultaneously and respectively, also can be unloaded respectively, and can be controlled in both a direct current way and a frequency modulation mode. The two stators are fixed at the two ends of a housing by a front end cover and a rear end cover. A shaft runs through the rotor and connected with the rotor by a key. The rotor rotates to drive the motor shaft to rotate to output mechanical power. The double-stator single-rotor rare earth permanent magnet motor has the advantages that: sectional areas of a live conducting wire and the winding embedding slots of the cores are ensured; the temperature rise of the motor is controlled; the output power and efficiency are improved; and the designing problems of the low-voltage high-power motor are solved.

Belonging to technical area of electrommunication, the invention is especially related to MIMO detection algorithm in 4G. The algorithm includes procedures: (1) based on system channel information H, Rho, calculating weight vector w of MMSE filter; (2) MMSE filtering the received signal obtains estimated value s' of symbol s in transmission antenna. The procedure (1) includes following steps: (1) calculate matrix A; (2) calculate inverse matrix of A; (3) calculate weight vector w of MMSE filter. Using formula disclosed in the invention calculates inverse matrix of A. essential of the invention is that re-numbering method of variable circulation is applied to MIMO detection algorithm; but, usually considering it is not possible to apply the algorithm to MIMO detection algorithm based on MMSE. The invention simplifies procedure of MIMO detection algorithm so as to lowers complexity and difficulties of hardware.

The invention relates to a modification method for planetary gear trains with positive addendum modification, and the planetary gear trains with positive addendum modification are applied to driving mechanisms for spreading solar panels of satellites. Positive addendum modification can increase the output precision, output stiffness and output torque of planetary gears under the condition of not changing the transmission envelope size of the planetary gears, thus enhancing the overall transmission performance of the planetary gears. The modification method for planetary gear trains with positive addendum modification includes establishment of a theoretical three-dimensional model, calculation of theoretical bearing status, making of a modification scheme, optimized design of modification parameters, modification, gear modification inspection, assembly and testing and comparison. When the modification method is applied to planetary gear trains with positive addendum modification for driving mechanisms for spreading solar panels of satellites, the problems of driving mechanisms, including low output precision, weak output stiffness and high transmission noise, are solved, and the requirement of spreading solar panels of satellites is met.

The invention relates to a manageable P2P (Peer-to-Peer) streaming media live broadcasting system based on an IMS (IP Multimedia Subsystem) in an NGN (Next Generation Network) and a realization method thereof. The system provided by the invention expands an overlay network management function entity and a network resource inquiry function entity on a streaming media service layer. The method provided by the invention comprises the following steps: using user terminal equipment capable of carrying out P2P as a calling request to establish a streaming media live broadcasting session; utilizing a streaming media service control function entity as a back-to-back user agent to select a content transmitter for calling user terminal equipment and establish a media transmission session with the content transmitter; utilizing the user terminal equipment capable of carrying out P2P to carry out a channel switching request updating session; and utilizing the streaming media service control function entity to select the content transmitter of a new channel for the user terminal equipment capable of carrying out P2P and establish the media transmission session with the content transmitter of the new channel. According to the invention, the centralized management of a P2P overlay network is realized; the problem of inconformity in a P2P distribution network and a physical network is solved; and simultaneously, the QoS (Quality of Service) of P2P media transmission is ensured by utilizing the SIP/SDP (session initiation protocol/session description protocol) session consultation mechanism in the IMS and the network control and resource reservation provided by the NGN.

The invention relates to the technical field of aircraft manufacturing, in particular to an inclined hole machining method which comprises the following steps of establishing a three-dimensional digital model of a part, and determining the spatial positions of a reference hole, a reference ball and an inclined hole; establishing an absolute coordinate system, and determining angles alpha and beta;establishing a rotating coordinate system, and determining the coordinate of the axis of the inclined hole; processing a reference hole and installing a reference ball; turning over the part to enable the axis of the inclined hole to be parallel to the axis of the machining spindle; aligning the center of the reference ball, and processing an inclined hole according to coordinates. The referenceball is used as a process reference; no matter the reference ball rotates to any direction, the center of the reference ball can be aligned, the reference origin still exists, the problem of referencedesign is well solved, the method is particularly suitable for machining inclined holes of single diversified parts, the requirement for machining high-precision inclined holes can be met only through a three-axis machine tool and a rotary workbench, and the cost is effectively saved.

The invention discloses a real-time spectrum analyzer tracking generator design method. 100 MHZ reference serves as phase demodulation reference of a first local oscillator and a tracking generator local oscillator loop; a first local oscillator signal is divided into two paths through a coupler, wherein one path of local oscillator signal passes through an amplifier 1 and then, reaches a reception down-conversion channel, and the other path of local oscillator signal passes through an amplifier 2 and then, reaches a frequency mixer; the reception down-conversion channel outputs an Intermediate-frequency signal to a high-speed ADC; and the high-speed ADC carries out digitization on an analog signal, and then, carrying out signal processing analysis. A tracking generator local oscillator output signal realizes mixed output or direct output with the first local oscillator signal through selection of switches 1 and 2, and then, passes through an amplifier 3, a low-pass filter 2 and a radio-frequency attenuator in sequence to serve as tracking generator output. On the basis of an original hardware architecture of a real-time spectrum analyzer, the method increases a tracking generatorand output channels thereof, conveniently realizes spectrum analyzer all-band tracking generator design, enables the spectrum analyzer to have a tracking generator measurement function, and greatly expands the application range of the real-time spectrum analyzer.

The invention belongs to the technical field of microwaves, and particularly relates to a frequency selection wave absorber. The wave absorber structurally comprises a loss layer and a transmission layer from top to bottom, wherein the loss layer comprises a first square ring metal patch, a circular ring metal patch, four rectangular metal patches welded with resistor elements, a first square dielectric plate and a second square ring metal patch; the transmission layer comprises a metal coating, and the metal coating is divided by a square ring gap and four right-angle gaps; and the first square ring metal patch and the rectangular metal patch cover the upper surface of the first square dielectric plate, and the second square ring metal patch covers the lower surface of the first square dielectric plate. The wave absorber has the advantages of being high in wave absorbing rate and low in loss, can be used for improving the stealth capacity of a broadband radar of aviation weaponry and solves the design problem of an airborne radio frequency aperture broadband radar stealth electromagnetic window of a high-stealth aircraft.

The invention provides a double-permanent-magnetic-tube two-end symmetric excitation cylindrical low frequency vibration calibration table with magnetic field tracking compensation, belonging to the field of vibration measurement technology. A cylindrical closed type magnetic field structure design is provided. Two cylindrical permanent magnetic tubes are symmetrically installed at two ends of an electromagnetic drive structure and face magnetic poles. Two symmetric closed magnetic circuits are formed by magnet yokes. The magnetic induction intensity distribution with high uniformity is generated in air gaps. The surfaces of the magnet yokes adjacent to the air gaps are provided with an array type micro structure in the form of deep trenches, and the eddy current loss can be effectively inhibited. A center magnet yoke is provided with a compensation coil, and a formed compensation magnetic field carries out synchronous tracking compensation on the influence of an armature reaction. The organic integration design of air lubricated guide technology is employed, and outstanding electromagnetic drive mechanical performance and high movement guide precision are obtained at the same time. According to the double-permanent-magnetic-tube two-end symmetric excitation cylindrical low frequency vibration calibration table, large stroke, high thrust, a linear electromagnetic driving force characteristic and high movement guide precision can be considered, and a high precision and large stroke high performance low frequency vibration calibration table technical scheme is provided for low-frequency/ultra-low frequency vibration calibration.

The invention relates to the technical field of infrared optical coating, and provides a 10.3-10.9 mum high-strength anti-reflection film on a ZnSe substrate. The structure of a film system is G/100L1010H901L10H933L10H/A. The invention further provides a coating method of the 10.3-10.9 mum high-strength anti-reflection film on the ZnSe substrate. The APS ion source high-energy assistance and substrate heating film coating mode is adopted. The high-strength antireflection film has the beneficial effects that after the two surfaces of the ZnSe substrate are coated with the high-strength antireflection film, the average transmittance of 10.3-10.9 mum reaches 99% or above; and moreover, the requirements of abrasion resistance, constant damp heat, low temperature and salt spray environment tests in the JB/T 8226.1-1999 optical part coating standard are met.

The invention provides a novel coupled feed antenna aiming at a clearance-free rear metal shell. The novel coupled feed antenna comprises a PCB and an antenna main body arranged on the PCB, wherein the antenna main body is provided with a feed point, a first feed branch and a second feed branch; a first intercoupling branch is coupled with the first feed branch and the second feed branch; a second intercoupling branch is coupled with the first intercoupling branch, wherein the first intercoupling branch and the second intercoupling branch are arranged at the part close to the edge of the PCB. By the coupled feed and the reasonable parasitic element configuration for the antenna, the bandwidth of the antenna is widened greatly, and the design difficulty of the antenna on the whole rear metal shell is solved effectively. Simulation and actual measurement show that the bandwidth of the antenna is relatively wide, the efficiency is relatively good, and the performances of the antenna at both the high-frequency section and the low-frequency section of mobile communication can well meet the requirement for mobile communication equipment.

Provided is a rapid multi-gap vacuum disconnector. The rapid multi-gap vacuum disconnector comprises an electrode structure, current-carrying contacts, a metal carrier structure, a driver, an insulating driving pull rod structure and a vacuum cavity, wherein the electrode structure comprises a movable main electrode connected with a corrugated pipe and a fixed auxiliary electrode, the insulating driving pull rod structure comprises contact carrier fixing sealing plates to which current-carrying contact metal carriers are fixed, corrugated pipes and an insulating driving pull rod, the corrugated pipes and the insulating driving pull rod are connected with the contact carrier fixing sealing plates, the current-carrying contacts are installed on the current-carrying contact metal carriers respectively, and working modes are switched through the insulating driving pull rods; the insulating driving pull rods drive the current-carrying contacts to shift through the contact carrier fixing sealing plates and the current-carrying contact metal carriers connected with the contact carrier fixing sealing plates, so that a circuit is formed by the main electrode, the auxiliary electrode and the current-carrying contacts when the rapid multi-gap vacuum disconnector is in the current-carrying working state; multi-gap vacuum insulation is formed by the main electrode, the auxiliary electrode and the current-carrying contacts when the rapid multi-gap vacuum disconnector in the isolation working state. According to the rapid multi-gap vacuum disconnector, application of multi-gap vacuum insulation in the rapid disconnector is achieved, and the high-voltage resistance capacity of the rapid multi-gap vacuum disconnector is improved.

The invention discloses a monocular vision-based finite time continuous control method for a water surface vehicle. The method belongs to the field of visual control of the water surface vehicle, andcomprises the following steps: acquiring an actual image and an expected image of a visual feature point through a monocular camera, recovering a pose error of the water surface vehicle by utilizing ahomography decomposition technology, and constructing a kinematics and dynamics model of a servo system; designing an NITSMC surface by utilizing the speed adjustment error so as to adapt to the unmatched visual uncertainty; designing an FOD, and observing matching disturbance in dynamics; introducing an exponential power reaching rate, and designing a continuous finite time monocular vision servo controller, so that continuous control input is ensured, and finite time convergence of the whole servo system can be realized. The method solves the control problem of a monocular vision servo system with non-matching uncertainty, improves the convergence rate and the control precision of adjustment errors, can effectively avoid feature point loss and vision servo failure caused by disturbance,and is particularly suitable for actual engineering requirements.