40results about How to "Effective frequency bandwidth" patented technology

The invention relates to a bandwidth adjustable n*3 lattice type vibration energy collector based on a modal separation technology, and belongs to environment energy collection devices in the technical field of micro energy. The bandwidth adjustable n*3 lattice type vibration energy collector comprises a flexible frame main beam structure, piezoelectric cantilever beams and mass blocks, the flexible frame main beam structure is rectangular, n-1 hollow rectangular holes of the same size and interval are formed successively in the rectangle along the axial direction, n rows of flexible main beams are formed, and n >=2; the piezoelectric cantilever beams of the same quantity are pasted and fixed to each flexible main beam; and the mass blocks are adhered to the hanging ends of all the piezoelectric cantilever beams respectively. According to the collector, the row number n of the piezoelectric cantilever beams is increased or decreased and the sizes of the piezoelectric cantilever beams and the mass blocks are changed, so that the effective bandwidth of a system is adjusted timely, the output continuity and stability of the energy collector are improved, and the environment adaptability of the vibration energy collector is enhanced.

The invention provides a method and a device for removing ghost reflection interference. The method comprises the steps of acquiring seismic data of each detection point in the frequency domain; acquiring the distance between each detection point and a seismic focus and the distance between the seal level to a sub-bottom reflection interface, and determining an offset factor reflecting the offset of each detection point according to the distances; determining the delay time of ghost reflection of each detection point according to a preset calculation method for the ghost reflection delay time on the basis of the offset factor; determining an operator for removing the ghost reflection of each detection point according to a preset calculation method for removing the ghost reflection on the basis of the delay time; and determining a frequency domain value of the seismic data with the ghost reflection interference being removed of each detection point according to the seismic data and the operator. In the embodiment of the invention, not only a low-frequency component of the seismic data in the frequency domain is recovered, and a high-frequency component of the seismic data is also recovered, so that the effective frequency band is effective expanded, the resolution and the signal-to-noise ratio of the seismic data are improved, and the noise interference of seal level ghost reflection multiple waves can be effectively removed.

The invention relates to a vehicle-mounted apparatus with functions of positioning, tracking and collision warning, and belongs to the electronic technical field of automobiles. Ear plates are arranged on the left and right side walls of upper and lower shells; limiting surfaces are arranged on the end parts of the front and back side walls; an acceleration sensor is arranged on the left side wall or the right side wall of the upper shell; a circuit board with an emission unit is arranged on the bottom wall of the lower shell; the upper and lower ear plates are connected through screws, and a cantilever beam type metal substrate is crimped between the upper and lower ear plates; the metal substrate, and piezoelectric wafers which are pasted on the upper and lower sides of the metal substrate form a piezoelectric vibrator; a moving magnet I and a mass block are arranged on the upper and lower sides at the free end of the metal substrate respectively; a moving magnet II is mounted at the lower end of the mass block; the moving magnet I, the mass block and the moving magnet II form an excitation arm; the width of the inner cavities of the upper and lower shells is less than that of the metal substrate, and greater than that of the piezoelectric wafers; and a fixed magnet I is mounted on the top wall of the upper shell while a fixed magnet II is mounted on the bottom wall of the lower shell. The vehicle-mounted apparatus with the functions of positioning, tracking and collision warning has the advantages and characteristics of high environmental adaptability, wide effective frequency band, high power generation capacity, and high reliability; and meanwhile, the vehicle-mounted apparatus can be used as an independent part to be embedded in a hidden place of the vehicle body, so that the vehicle-mounted apparatus is safe and reliable.

The invention relates to a wind-induced gyromagnetic excitation type piezoelectric generator and belongs to the technical field of new energy. The left and right ends of a shell are respectively provided with a left end cover and a right end cover. A main shaft is mounted on the left and right end covers through a bearing. A left shaft sleeve, a middle shaft sleeve and a right shaft sleeve are sequentially sleeved on the main shaft from left to right. A blade is arranged on the right end portion of main shaft. Magnetic cam rings are arranged on the right side of the left shaft sleeve, the two sides of the middle shaft sleeve and the left side of the right shaft sleeve, respectively. The left shaft sleeve, the middle shaft sleeve, the right shaft sleeve and the magnetic cam rings arranged on the shaft sleeves together form a cam, a left cam slot and a right cam slot. Piezoelectric vibrators are arranged on bosses on the inner wall of the shell. The free ends of the piezoelectric vibrators are provided with magnetic blocks. The magnetic blocks are arranged in left and right cam slots. The reaction force between magnetic blocks and adjacent magnetic cam rings is a repulsive force. When the magnetic blocks are in contact with the vertexes of cam surfaces on the right sides of the left and right cam slots, the bending deformation of the piezoelectric vibrators does not occur. When the magnetic blocks are in contact with the vertexes of cam surfaces on the left sides of the left and right cam slots, the deformation amount of two lamination composite layers at the free ends of the piezoelectric vibrators is smaller than the allowable value thereof.

The invention relates to a novel high-speed rail shaft monitoring system, and belongs to the field of rail vehicle monitoring and piezoelectric power generation. A wheel shaft is arranged on a frame via a bearing, an end cover is arranged at an end part of a shell of the frame, a cylindrical cam with a cam groove is arranged at an end part of the wheel shaft, one end of the cylindrical cam sleevesthe wheel shaft and props against to an inner ring of the bearing, piezoelectric vibrators and a spring sheet are arranged on a boss of the shell of the frame, a free end of the spring sheet is embedded into a groove of an exciter, a guide post is arranged on the exciter, a rolling body sleeves the guide post and is in a cylindrical or spherical shape, the rolling body is arranged in the cam groove, each piezoelectric vibrator is formed by splicing a substrate and a piezoelectric sheet, the piezoelectric vibrators are symmetrically arranged at two sides of the spring sheet, the substrate is arranged near to the spring sheet, a gasket is crimped between the substrate and the spring sheet, suspended magnets are arranged at free ends of the piezoelectric vibrators, a circuit board and a sensor are arranged on the frame, the piezoelectric vibrators are connected with the circuit board via wires, and the circuit board is connected with the sensor via a wire.

The invention relates to a high-performance piezoelectric longitudinal vibration energy harvester, and belongs to the technical field of new energy. An outer barrel is arranged between check rings of a support platen and a cover plate through screws, and an inner barrel is pressed between counter bores of the support platen and the cover plate. An inertia block is formed by two mass blocks, a magnet ring and a nut jointly, sleeved with the inner barrel, and connected with the support platen through a spring. Two metal sheets with piezoelectric plates adhering to the arc convex sections of the metal sheets are riveted and then form piezoelectric vibrators, and energy converters are formed by the piezoelectric vibrators, wedge blocks and magnet blocks, wherein the wedge blocks and the magnet blocks are riveted to the two ends of each piezoelectric vibrator. The wedge blocks of the two energy converters are installed in dovetail grooves in the inner wall of the outer barrel, and guide posts of the magnet blocks are arranged in two radial through holes in the side wall of the inner barrel respectively. The magnet blocks are installed close to opposite magnetic poles of magnet rings. The high-performance piezoelectric longitudinal vibrating energy harvester has the advantages that the piezoelectric plates only bear pressure stress, the deformation direction of the piezoelectric vibrators is perpendicular to the vibrating direction, deformation is not directly related to the mass of the inertia block, and a two-freedom-degree system is formed by the energy converters and an inertia block-spring system, so that reliability is high, inherent frequency is low, and the effective frequency band is wide.

A vibration actuator includes a bracket coupled to a case to form an inner space; a stator having a circuit board coupled to an upper surface of the bracket, a coil connected to the circuit board, and a yoke provided in the coil; a vibrator having a permanent magnet disposed at an outer side of the coil and a weight coupled to an outer circumference of the permanent magnet; an elastic member configured to connect the stator and the vibrator and elastically support the vibrator; and a non-magnetic damper provided between the weight and the elastic member.

The invention relates to a step by step indirect excitation type current generator, and belongs to the power generating field; an end cap is arranged on the housing cylinder wall end portion, and provided with a boss and inner ear plates; the boss is provided with a limit plate; two sides of the boss are provided with energy transducers; the inner ear plate is provided with a reed; two ends of a square guide pillar are respectively fixed on the two inner ear plates; the square guide pillar is sleeved by inner springs and an inertia block; the inner springs are arranged on top and bottom sides of the inertia block; the left and right sides of the inertia block are respectively provided with a push block and an excited magnet; the push block is arranged between two energy transducers; the energy transducer free end makes contact with the push block, yes not action force is formed; a coil is embedded on the inner side of the housing bottom wall, and an upper ear plate and a lower ear plate are arranged outside the housing bottom wall; the upper and lower ear plates are mutually connected through two round guide pillars; two ends of a bluff body are respectively sleeved on the two round guide pillars; the bluff body is a hollow structure; the round guide pillar is sleeved by two external springs; two ends of the external spring respectively press on the bluff body and the upper ear plate or the lower ear plate; the wing plates of the bluff body are provided with exciting magnets; the isomerism magnetic poles of the exciting magnet and the excited magnet are arranged in opposite.