353 results about "Acoustic transmission line" patented technology

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 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.

One embodiment of an axial rotary joint having rotary transmission lines for the bi-directional propagation of radio frequency electromagnetic waves and light waves across a rotary interface. Each section is capable of fully independent rotation about a common longitudinal axis. The radio frequency rotary transmission line comprises waveguide tubing at each end that transitions to a coax transmission line at the rotary interface. The waveguide tubing also functions as the axial support structure. The second transmission line for light wave propagation is fully integrated into the waveguide-to-coax transition and the inner coaxial conductor, and uses optical coupling devices to form an optical coupling path across the rotary interface. This embodiment of the rotary joint can be sealed and pressurized to minimize contamination of the optics and to increase the electromagnetic wave power handling. The second transmission line in another embodiment is a combined millimeter wave and optical transmission line supporting simultaneous millimeter wave and light wave propagation across the rotary interface. Combining and decombining filters incorporated into the physical rotary transmission lines in other embodiments create a multitude of channels on various frequencies and wavelengths, greatly increasing the usefulness of the device.

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 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 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.

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.

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 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 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.