355 results about "Acoustic transmission line" patented technology

Dual-band and multi-band radiating elements are described based on composite right / left-handed (CRLH) meta-material transmission line (TL). These elements can operate as resonators and / or antennas depending on feed-line configuration. The radiating elements are based on the fundamental backward wave supported by a composite right / left-handed (CRLH) meta-material transmission line (TL). Unit-cells of the transmission line comprise conductive patches coupled through vias to a ground plane. The physical size and operational frequencies of the radiating element is determined by the unit cell of the CRLH meta-material. This radiating element is configured for monopolar radiation at a first resonant frequency and patch-like radiation at a second resonant frequency. The first and second resonant frequencies are not constrained to a harmonic relationship.

The invention discloses an automatic transmission line cleaning device comprising a fixed frame, a base plate, a first control motor, a second control motor, and a drum. The fixed frame is vertically mounted on the base plate. Two layers of corresponding mounting frames are mounted on the fixed frame. The upper mounting frame is equipped with forwarding wheels. The lower mounting frame is equipped with a driving walking wheel and a driven walking wheel. The driving walking wheel is controlled by the first control motor. The inner wall of the movable drum on the fixed frame is equipped with a dust collection cylinder which is provided with a brush. A scraper near a transmission line is connected between the drum and the dust collection cylinder. The dust collection cylinder is connected with a dust collector through a communicating pipe. The drum is driven by the second control motor. The cleaning device of the invention is simple in structure and easy to control, can effectively remove ice, iron wires and entanglements on transmission lines, can quickly and effectively clean dust on transmission lines and collect the dust to achieve the purpose of pollution-free cleaning, and has a good cleaning effect.

An ultrasound system has a catheter including an elongate flexible catheter body having at least one lumen extending longitudinally therethrough. An ultrasound transmission wire extends longitudinally through the lumen of the catheter body, and has a proximal region, a distal region, and an intermediate region between the proximal region and the distal region. A sonic connector is connected to the proximal region of the ultrasound transmission wire, and a distal head is positioned at the distal end of the catheter body and coupled to the distal region of the ultrasound transmission wire. The proximal region of the ultrasound transmission wire has a larger diameter than the intermediate region, the intermediate region is continuously tapered with a progressively decreasing diameter from its proximal end to its distal end, and the distal region has a greater diameter than the distal end of the intermediate region.

An ultrasonic transducer utilizes a unique forward acoustic transmission line comprised of a composite structure partially consisting of a portion of a continuous smooth sheet of material, such as an automobile bumper, from which the acoustic beam is emitted. This makes it invisible to sight, thus allowing for an improved object detection system in which the sensors cannot be seen, so that they do not interfere with the smooth lines that were designed into the surface of the object or vehicle onto which they are mounted. This is a significant improvement for applications where the look and style of the surface of the platform is important, such as in automotive park assist systems.

A method and system for dynamically adjusting packet size to decrease a delay of a streaming data transmission. A measurement is obtained by a measuring computing unit (i.e., data transmission server or client computing unit). The first measurement is either (1) a delay of a streaming data transmission being sent from the data transmission server to the client computing unit via a plurality of packets or (2) a frequency of damaged packets of the plurality of packets. The damaged packets contribute to the delay of the streaming data transmission. The packet size is adjusted by the data transmission server. The packet size adjusting includes utilizing the measurement and facilitating a reduction of the streaming data transmission delay. The delay results from noise on one or more communication link segments used by the streaming data transmission.

The invention relates to a convertible static compensator provided with a modular multilevel converter structure. The convertible static compensator provided with the modular multilevel converter structure comprises a static synchronous compensator, a static synchronous series compensator and a series transformer (12). The static synchronous compensator comprises a converter (7) and a transformer. The static synchronous series compensator comprises a converter (9), a series transformer (10) and a change-over switch. One end of the converter (7) of the static synchronous compensator is in parallel connection with an electric transmission line I through a shunt transformer (8). The other end of the converter (7) of the static synchronous compensator is connected with one end of the converter (9) of the static synchronous series compensator. The other end of the converter (9) of the static synchronous series compensator is connected with an electric transmission line II through the change-over switch and the series transformer (10) of the static synchronous series compensator in sequence. The series transformer (12) is in series connection with the electric transmission line I. The convertible static compensator provided with the modular multilevel converter structure breaks through the technological difficulty of components in series, facilitates individual-phase control and modular design, bypasses a trouble unit through redundancy, and improves the reliability of the operation of equipment. Further, component switching frequency is low, and therefore equipment operation loss is small.

The invention relates to a device for removing foreign matters in an electric transmission line, and belongs to the technical field of electric power. The device comprises a support frame and a set of cleaning cylinders hinged to the periphery of the support frame, wherein the set of cleaning cylinders is of a two-section type split structure, at least two sets of traveling mechanisms are arranged inside each cleaning cylinder in the direction of the electric transmission line, and each traveling mechanism comprises a pair of traveling wheels and a first motor which are symmetrically arranged up and down; the interior of each cleaning cylinder is further provided with a sweeping mechanism, each sweeping mechanism comprises four hairbrush rollers and a second motor, each hairbrush roller comprises a roller and a hairbrush on the surface of the roller, a mounting ring with an L-shaped cross section is arranged at one end of each cleaning cylinder, a graphite ring of a two-section type structure is mounted at the concave position of the mounting ring, a cutting mechanism is mounted on the periphery of the graphite ring, and the cutting mechanism comprises a rotating ring with a driving mechanism and a set of cutting knives annularly arranged on the outer side of the rotating ring. Cutting, drilling and stripping of suspensions and coverings and sweeping of relatively small impurities can be realized, the effect of removing the foreign matters is obviously promoted, and the removal of the foreign matters on the electric transmission line can be realized in deed.

The invention discloses a charging system in the driving state of electric cars, which comprises an external power supply part and a vehicle power-receiving part, wherein the external power supply part consists of rail-style transmission lines and reflow lines which are laid on a charging driveway and insulation tapes between the reflow lines and the ground; the vehicle power-receiving part consists of a pantograph assembled on the car body, a pantograph slide plate, transmission lines and a pantograph lifting control system thereof. When the electric car requires to be charged and drives to the charging driveway, the pantograph is put down under the control of the pantograph lifting control system; the contact surfaces of the slide plate transmission lines on the pantograph slide plate are in electric contact with the contact lines in sliding for receiving the current and charging when a car drives. The charging system charges the running electrical cars and solves the disadvantages that the battery capacity of the electric cars cannot support long-time sustained running.

The invention provides an electric transmission line traveling wave fault distance measurement method based on regional data. The method comprises the following steps that the structure of a regional power grid structure is analyzed; fault distance measurement calculation is carried out through regional power grid data; reflected wave identification is carried out, and electric transmission line traveling wave fault distance measurement is carried out through a single-end traveling wave method. According to the method, distance measurement calculation is carried out through transformer substation data related to fault lines in a regional power grid, a system can normally work under the conditions that devices on one side break down, a GPS is lost and communications are interrupted, and the overall reliability and precision of an electric transmission line traveling wave fault distance measurement device are improved.

The invention discloses a tunable band-stop filter of constant absolute bandwidth based on a modular structure, which comprises a micro-band structure in the upper layer, a medium substrate in the middle layer and a grounded metal plate in the lower layer. The filter can consist of one module unit or a plurality of module units, each of which comprises two resonators and a main transmission line;the two resonators are both half-wavelength resonators which have the same structure, and the two resonators are symmetrical about a central vertical axis in the micro-band structure; the main transmission line comprises a coupling part and a non-coupling part; the coupling part consists of a seventh micro-band line, an eighth micro-band line and a ninth micro-band line, and the lines are sequentially connected to form an n-shaped structure which is arranged at the inside of an n-shaped structure of the coupling part of the resonators; variable capacitance diodes of the two resonators are setwith the same bias voltage; and the filter can be applied to various reconfigurable radio frequency front-end circuits and has the characteristics of constant absolute bandwidth when the frequency istuned. By cascading two or more module units, a tunable band-stop filter of constant absolute bandwidth can be obtained, the frequency selectivity of which is higher.

The invention relates to a method for selecting a fault phase of an alternating current transmission line by using transient energy. The method comprises the following steps of: when the alternating current transmission line fails, extracting a fault component of a three-phase current travelling wave after the fault, and constructing zero mode current and line mode current; performing wavelet transform on phase current and mode current respectively, and solving the transient energy; if the energy value of a zero mode is less than 1 percent of the maximum mode energy value, determining that the fault is a phase-to-phase fault, and otherwise, determining that the fault is an earth fault; if the energy value of a certain phase current is more than 20 percent of the maximum phase current energy value, determining that the fault is the fault phase; and if the fault is the phase-to-phase fault and the energy values of the other two-phase current are less than 20 percent of the maximum phasecurrent energy value, determining that the fault is a three-phase fault. In the method, a phase selection judgment basis is relatively simple, has relatively high applicability to transition resistance and fault initial angles, and can provide a correct basis for the tripping of a breaker in the consideration of combined reclosing at any fault initial angle.

A temporary cardiac-assist device is disclosed. The device includes a pump assembly that is deployed in the ascending aorta or the heart. A torque transmission line couples the pump assembly to an external motor for driving impeller blades within the pump assembly. The pump assembly expands in size at its destination site for operation. In operation, neither the torque transmission line nor elements that support the impeller blades are under axial forces.

The invention discloses a broadband grid antenna array. The broadband grid antenna array comprises a reflection floor and a plurality of radiating elements uprightly arranged on the reflection floor, wherein a plurality of micro strip transmission lines respectively connected with all the radiating elements are arranged on the upper layer of the reflection floor, the plurality of the radiating elements on the reflection floor form a grid antenna array in surrounding mode, radiation patches cover the obverse side and the reverse side of each radiating element, a section of each radiation patch, located on the lower portion of each of the obverse side and the reverse side of each radiating element, is corroded so as to expose a medium portion, metal slices are respectively pasted at the left end and the right end of each exposed medium portion, the metal slices are respectively connected with the radiation patches and the micro strip transmission lines, a plurality of via holes are formed in the periphery of each radiating element, and the plurality of the via holes penetrate through the radiation patches on the obverse sides and the reverse sides of each radiating element. The broadband grid antenna array is provided with a simple feed network, has the advantages of being large in bandwidth, easy to process, low in cost and the like, and can meet requirements of a broadband communication system.

The invention provides a routing inspection air vehicle with multiple rotor wings and an electric transmission line hanging method of the routing inspection air vehicle. The method comprises the steps that when it is judged that wires and ground wires to be hung are located on the upper area of an image shot by a guide video camera of the routing inspection air vehicle with the multiple rotor wings, the rotor wings of the routing inspection air vehicle are controlled to fly upwards; when it is judged that the wires and ground wires to be hung are located on the lower area of the image, the rotor wings are controlled to fly downwards; when it is judged that the wires and ground wires to be hung are located on the area close to the image, the rotor wings are controlled to fly horizontally and get close to the wires and ground wires to be hung; when it is judged that the wires and ground wires to be hung are located on the line falling area of the image, the rotor wings are controlled to stop flying and land. The routing inspection air vehicle with the multiple rotor wings has the accurate power line hanging function, broadens routing inspection view, improves routing inspection efficiency, and lowers the labor cost of routing inspection.

The present invention provides a voice input apparatus which can extract an input voice without interrupting a generated background sound.When a talk switch 50 is pushed down, a LMS algorithm processing part 26 stops an update operation of a filter coefficient of an adaptive filter 24 and stores filter coefficient W1 at this moment in a portion for storing filter coefficients 30. A portion for calculating filter coefficients 44 calculates a filter coefficient W2 of a filter 42 to simulate a sound-transmittal line of an audio sound which is produced from a speaker 102 and is input into microphones 10, 12 by means of these stored filter coefficient W1 and various transmittal characteristics CS1, CS2 and the like. By extracting an output signal Y4 of the filter 42 from an output signal Y3 of a portion for eliminating surrounding noise 20 by means of a computing part 46, audio sound components included with an operating voice collected by the microphones 10, 12 are removed.

The invention discloses an electric transmission line multi-state information monitoring system based on the 3G internet of things technology. The information monitoring system comprises a front end information collection and transmission device, a background server and a client side. The front end information collection and transmission device gets an access to the internet through a 3G wireless network and is connected with the background server through the internet. Data transmission is carried out between the background server and the front end information collection and transmission device through the internet, and the background server obtains audio and video information and running status parameter information of an electric transmission line. The client side is connected with the background server through the internet or a local area network, gives instructions to the background server according to user instructions and obtains the audio and video information and the running status parameter information of the electric transmission line. The electric transmission line multi-state information monitoring system integrates electric transmission line image monitoring, electric transmission line multiple running status parameter monitoring and other monitoring methods, and reflects the running status of an electric transmission line device more accurately and comprehensively.

The invention discloses an automatic device communication address allocation system based on a serial interface. The system comprises a master device, a plurality of slave devices and switching elements, wherein the master device is arranged at one end of a communication system, the slave devices are sequentially connected through connecting lines, and the switching elements in one-to-one correspondence to the slave devices have unidirectional shutoff performances. In the communication system, at least one connecting line is arranged among the master device and the slave devices. Compared with the prior art, the system has the advantages that addresses can be automatically set through the slave devices, the lines of the communication system can be simplified, production, installation and debugging of the communication system are simpler, faults can be handled according to signal interrupting positions when the system is faulted, besides, the master device directly exchanges information with the slave devices through signal transmission lines, loss in fault time and after fault is decreased, and reliability of the communication system can be improved.

The invention provides a branch knot loading compact type microstrip filter. Metal circuits with left-right symmetrical patterns are arranged on a metal surface layer. The metal circuits comprise bent input-output ports which are left-right symmetrical and arranged in a Z shape, source end and load loading transmission lines and input-output couplers which are inwardsafter bending. The source end and the loading transmission lines are connected in a bending mode. The branch knot loading compact type microstrip filter further comprises a T-shaped opening circuit loading upper transmission line, a T-shaped opening circuit loading lower transmission line and left-right-parallel even transmission line resonance units of a downward bent structure. The T-shaped opening circuit loading upper transmission line and the T-shaped opening circuit loading lower transmission line are located at a middle position and of a cross-shaped crossing structure and arranged vertically. The branch knot loading compact type microstrip filter solves the problem that a traditional microstrip filter is large in size, low in stop band restrain level and high in loss.

The invention discloses a fall prevention device which comprises a sole plate, a pressure sensor, a bolt, a signal transmission line, a first gear, a motor, a second gear, a cable, a data processing device, an acceleration sensor and a myoelectricity sensor. The pressure sensor is installed at one end of the bolt and connected with the data processing device through the signal transmission line; the first gear is connected with the other end of the bolt; the motor is connected with the data processing device through the cable; the second gear is in transmission connection with the motor and the first gear; the data processing device is used for processing signals, real-time status of human body poses is obtained, the motor is controlled according to the human body poses, and height of the bolt is adjusted. The fall prevention device can comprehensively and accurately reflect whether a human body is about to fall, the signals are classified by adopting artificial intelligence technology, current human body pose status is obtained, and the motor is controlled further to adjust the height of the sole bolt so as to prevent patients from falling.

The invention relates to a method for measuring an angular spectrum of the acoustic transmission performance of a large-area hydrophone material. According to the method, a broadband transducer with certain directivity and low fluctuation along with frequency and inverse filter compression pulse signals are designed, so that the lowest test frequency of a test sample is reduced to 1 / 2.5 of that of a test sample tested by a conventional method; by implementing the broadband testing technology, work efficiency is greatly improved, and testing time is shortened to a fraction and even one of dozen fractions of testing time spent by the conventional method; and the angular spectrum of the acoustic transmission of a complicated component is measured by reasonably arranging an acoustic field and selecting a proper time window. The method has the advantages that the angular spectrum of the acoustic transmission performance of the component made of the hydrophone material is measured at low frequency, and conflict in aspects of the lowest testing frequency, the testing angle, the size of the test sample and the like is overcome to the greatest extent; the problem of low efficiency of the conventional method is solved, and work efficiency is greatly improved; and the limitation that the conventional method only can be used for testing simple test samples is broken through, and the angular spectrum of the acoustic transmission performance of the complicated component can be measured.

A printed circuit board includes a number of signal layers, a number of ground layers, a first transmission line, a second transmission line, a first via, and a second via. The first transmission is located on one of the number of signal layers. The second transmission line is located on another of the number of signal layers. The first and second vias pass through the printed circuit board. The first via is electrically coupled to the first and second transmission lines, and is isolated from the number of ground layers. The second via is electrically coupled to one or more of the number of ground layers, and is isolated from the other of the number of ground layers to increase an inductance, thus compensating capacitive nature of an open stub and improving signal integrity.

The invention discloses a method for locating a fault through the travelling wave natural frequencies at the two ends of an electric transmission line and belongs to the technical field of fault locating of electric transmission lines. According to the method for locating the fault through the travelling wave natural frequencies at the two ends of the electric transmission line, fault currents at the two ends of the electric transmission line are processed based on the atomic decomposition algorithm, main travelling wave natural frequency values at the two ends of the electric transmission line are determined based on atoms generated through iteration, the main travelling wave natural frequency values are corrected and calculated, the ratio of the length of a faulty line to the total line length is determined according to the inverse ratio of the corrected main travelling wave natural frequency values at the two ends of the electric transmission line, and therefore the position of a fault point is determined according to the distribution positions of poles and towers of the electric transmission line. By the adoption of the method for locating the fault through the travelling wave natural frequencies at the two ends of the electric transmission line, the main natural frequency value of the fault currents can be accurately determined, the fault locating precision is high, and a result is reliable.

The invention discloses a complex electrical field measuring system which comprises a complex electrical field sensing and measuring unit, a handset unit and a measured place grounding reference plate-type electrode. According to the system, devices of a complex electrical field can be tested simultaneously at a same measuring position, or a power frequency electric field, a direct-current electric field and an AC / DC combined complex electric field can be respectively measured in a controlled way. Thus, the function of measuring three different electric fields by a same measuring instrument is realized without a computer used as a part for achieving the measuring function, and measured date adopts wireless transmission. the method is direct and can be adopted to conveniently, effectively and accurately measure magnitude of an electric field of an electric transmission line and a convertor station in AC, DC and AC / DC parallel areas at a same measuring point, thus providing scientific data monitoring basis for transmission and transformation project environmental evaluation and research on electromagnetic environment level of AC / DC electric transmission line parallel and cross and span areas. In addition, measurements are convenient and simplified.

The invention discloses a reset unit for correcting the displacement of a damper on an electric transmission line. The reset unit comprises a shell, wherein a laser range finder and a striker are arranged at the front end of the shell, a strip-shaped opening is formed in the shell in the length direction, and the shell is hung on a power transmission line through the strip-shaped opening to enable the power transmission line to pass through the interior of the shell; traveling wheels are arranged in the shell and located above the power transmission line, and a locking wheel capable of moving near the power transmission line is arranged in the shell and located below the power transmission line; a signal transceiver and a controller are also arranged inside the shell, the controller is connected with the signal transceiver, the laser range finder and the striker, movement of the shell and working of the striker are controlled by a remote controller matched with the signal transceiver, and the striker can reciprocate along the power transmission line to strike the damper constantly so as to make the damper reset. The whole reset unit is controlled remotely to move, correction and operation are easy, operability is high, and safety is high.

The invention relates to an electric transmission line foreign matter removal robot which is used for operating on an electric transmission line to remove foreign matters on the electric transmission line by carrying a foreign matter removal tool. The electric transmission line foreign matter removal robot comprises a robot body, a travelling mechanism and a three degree-of-freedom mechanical arm, a control system is arranged inside the robot body, the travelling mechanism is connected with the robot body and moves along the electric transmission line, the three degree-of-freedom mechanical arm is arranged outside the robot body and can move by three degrees of freedom under control of the control system, and the foreign matter removal tool is arranged on the three degree-of-freedom mechanical arm. The electric transmission line foreign matter removal robot can move along the electric transmission line and is convenient, compact, easy to operate, wide in applicable range and applicable to various electric transmission lines, the three degree-of-freedom mechanical arm with the three degrees of freedom drives the foreign matter removal tool to a proper position to remove the foreign matters, and a method for removing the foreign matters is simple and reliable.

An electronic connector is disclosed in the present disclosure. The electronic connector includes: a male connector; a female connector comprising: a shell; a supporting element received in the shell, and including an insertion opening and a receptacle space communicated with the insertion opening; a magnetic element received in the shell and surrounding the supporting element; a first terminal assembly and a second terminal assembly corresponding to the first terminal assembly received in the supporting element, wherein, the first terminal assembly including a plurality of first terminals, and the second terminal assembly including a plurality of second terminals, each of the first terminal extending into the receptacle space, and each of the second terminal extending into the receptacle space, and the first terminal and the corresponding second terminal forming a clamp for clamping the male connector which is inserted into receptacle space via the insertion opening.

The invention discloses a tool capable of cleaning a hanging object on an electric transmission line. The tool comprises an extensible insulating rod. An upper end of the insulating rod is provided with a foreign matter cleaning head. The foreign matter cleaning head comprises a vertical main rod. The main rod is crosswise provided with several cross bars which are arranged up and down. The adjacent cross bars are interlaced and form a certain angle. Several needles are arranged on the main rod which is below the top cross bar. The insulating rod is provided with a scale. The tool of the invention can easily clean the hanging object on the electric transmission line. In the prior art, operation of cleaning the foreign matter on the electric transmission line is not accurate. By using the tool of the invention, the above problem is overcome.

The invention discloses a loudspeaker module and a portable terminal. The loudspeaker module comprises a shell, a sound production monomer, an acoustic transmission separator, a sound absorbing material and a support piece, wherein the shell is provided with an inner cavity; the sound production monomer is accommodated in the inner cavity, and divides the inner cavity into a front cavity and a rear cavity; the acoustic transmission separator is a flake and is accommodated in the rear cavity; a sound absorbing cavity is formed by the acoustic transmission separator and the inner wall surface ofthe shell in an enclosing manner; the sound absorbing cavity is filled with the sound absorbing material; the support piece is arranged between the sound production monomer and the acoustic transmission separator; and the side, which faces towards the sound production monomer, of the acoustic transmission separator is supported by the support piece, so as to form an avoidance gap between the acoustic transmission separator and the sound production monomer. The loudspeaker module disclosed by the invention has effects of ensuring that no collision occurs between the acoustic transmission separator and the sound production monomer and making full use of the space of the rear cavity.