62results about How to "High base frequency" patented technology

The invention discloses a general vibration test fixture for track traffic electrical equipment and an installation method of the general vibration test fixture. The general vibration test fixture comprises an assembly part I and an assembly part II, and both the assembly part I and the assembly part II are formed by welding or integrally casting soleplates and vertical plates. The general vibration test fixture disclosed by the invention is characterized in that reinforcing ribs are arranged between the vertical plates and the soleplates, so that the integral rigidity is increased; the vertical plates of the assembly part I and the assembly part II are respectively provided with a T-shaped slot and long through holes I in the back and force direction (X direction), so that the installation requirement of screw holes in different spacings is satisfied; the soleplates of both the assembly part I and the assembly part II are provided with long through holes II in the left and right direction (Y direction), so that the installation requirement of screw holes of vibration table surfaces in different spacings is satisfied, therefore the generality of the fixture for track traffic electrical equipment of a base-mounted type is achieved. The general vibration test fixture disclosed by the invention is low in cost, high in resonance frequency, small in volume, light in weight, good in rigidity, convenient in installation and high in work efficiency, thereby having higher economic usefulness.

The invention relates to a primary structure of a large-aperture long-focus collimator, which comprises a vibration isolation platform (4), a vacuum chamber (5) and a truss (1) arranged in the vacuum chamber (5). The vacuum chamber (5) is fixed on the vibration isolation platform (4) through support legs (8). The primary structure is characterized in that: the bottom surface of the vacuum chamber (5) is provided with a plurality of through holes (13); supporting legs (2) having the same number as the through holes are arranged on the lower part of the truss (1); the supporting legs (2) pass through corresponding through holes (13) respectively and are supported on the vibration isolation platform; and flexible sealing elements (9) are arranged between the supporting legs (2) and the through holes (13). The primary structure solves the technical problem that a conventional primary structure of the large-aperture long-focus collimator has poor stability and weak anti-jamming capacity; and the primary structure of the large-aperture long-focus collimator has higher optical performance.

The invention relates to a self-powered anemoscope, belonging to the technical field of wind power measurement. a semi-shaft and sensors are arranged above the swing disc body, a boss, a circular table, and a circuit board are arranged under the disc body, the sensors are uniformly distributed on the circumference by taking the center of the semi-shaft as the circle center, a sail support sleeve with canvas sleeves the semi-shaft, the sail support chassis is pressed on the swing disc body through a group of rollers, two magnets symmetrically arranged at the two sides of the semi-shaft are embedded under the sail support chassis, an outer casing is arranged on a base, an exciter connection board is arranged on the boss of the base, the exciter connection board is provided with a swing rod, an excitation disc is arranged on the swing rod, a stud is arranged on the excitation disc, the stud is connected with the boss of the swing disc, the side wall of the boss of the base is uniformly provided with generating units each consisting of a flat spring and piezoelectric oscillators symmetrically arranged at the two sides of the flat spring, the free end of the flat spring and the edge of the excitation disc contact and don't act with each other, each piezoelectric oscillator is formed by the bonding of a substrate and a piezoelectric sheet, the free end of the substrate is provided with a flange, and the substrate is close to the flat spring and the flange abuts against the flat spring.

The invention relates to a multidimensional vibration energy harvester, and belongs to the piezoelectric generating technical field; an upper cover is arranged on the housing side wall, and provided with an upper cylinder and a limit ring; the housing side wall is provided with an annular platform, the housing bottom wall is provided with a lower cylinder, a limit ring and a circuit board; the top and bottom of an isolation plate of an exciter are symmetrically provided with spherical segments and exciting rings; the isolation plate and the exciting rings on two sides can form an annular groove; the spherical segments on two sides of the isolation plate are concentric; the spherical segment center and the exciting ring center are eccentric in the horizontal direction; the exciting ring exciting surface is a slope; the annular groove, far away from the spherical segment center, of the exciter is provided with an inertia block; the spherical segments on two sides of the isolation plate are respectively placed in the recessed spherical surface on the end portions of the upper and lower cylinders; the upper and lower cylinders are respectively sleeved by a reset spring; the housing annular platform is provided with two piezoelectric oscillators separated by an isolation ring; the piezoelectric oscillator is formed by bonding a substrate with a piezoelectric patch; the substrate end portion is provided with a flange; the substrate is mounted close to the isolation ring; the piezoelectric oscillator abuts against the exciting surface.

The invention discloses a method for processing a quartz resonator wafer. The quartz wafer is processed by the following steps: I, plating a metal film, namely totally plating chromium on a wafer board by using a film plating machine, plating gold, and finally depositing the gold on the surface of the wafer board in a film form, wherein the vacuum degree of the film plating machine is 0.35-0.45Pa,the sputtering power of the gold is 0.65kW, and the sputtering power of chromium is 0.4kW; II, performing spray gluing; III, performing soft baking; IV, performing mask alignment and exposure; V, baking after exposure; VI, developing; VII, performing hard baking; VIII, removing the metal film; IX, performing BOE corrosion; X, removing photoresist; XI, repeating the steps II-VIII; XII, splitting;and XIII, etching, and cleaning, namely placing the wafer into an etching machine, etching by an etching solution, flushing and drying. According to the method disclosed by the invention, the mechanical grinding wafer thickness limit of 30 microns is broken through, the power is about 55MHz, and the etching effect is excellent.

The invention provides a platform load cooperation system for an ultra-large-aperture optical camera. The system comprises a secondary mirror system and a primary mirror, wherein the secondary mirror system and the primary mirror are respectively disposed at the two sides of a platform, in case of an initial state, the secondary mirror system, the platform and the primary mirror are all at a completely furling state, and the secondary mirror system, a service chamber and the primary mirror are fixedly connected; and during extension, the primary mirror and the secondary mirror system are respectively pushed away from the service chamber towards a reverse direction by reliance on a furling truss structure and are locked once in place, the platform is extended to form three portions connected with one another, and after the primary mirror is completely extended, an optical path between the primary mirror and a secondary mirror passes through the inside of the extended service chamber so that it is ensured that the optical path is not shielded, the camera images normally, and the problem of the optical satellite configuration design of an ultra-large-aperture mirror surface is solved.

The invention belongs to the technical field of elevators and application of the elevators, and particularly relates to a stirring type piezoelectric elevator alarm device. An end cover is arranged atthe end portion of the side wall of a body. A rocker is arranged at the outer portion of the side wall. Ribbed plates are evenly distributed in the side wall and provided with flexible stirring sheets through screws and pressing strips. The parts, making contact with the ribbed plates, of the free ends of the flexible stirring sheets are long, and the parts, making contact with the pressing strips, of the free ends of the flexible stirring sheets are short. A circuit board is arranged on the inner side of the upper wall of the body and provided with an energy conversion processing circuit anda signal transmitting system. A rotation shaft is arranged on the upper wall of the body, the right end of the rotation shaft stretches out of an inner cavity of the body through the end cover, and the right end of the rotation shaft is arranged on the base through an end face bearing and a nut. The rotation shaft is sleeved with a fixing ring, and the fixing ring is provided with a fixing block.A set of piezoelectric vibrators are arranged on the fixing block, and each piezoelectric vibrator is formed by bonding a substrate and a piezoelectric plate. The substrates are installed close to the fixing block. A base plate of the fixing ring is arranged on the base through screws, balls for positioning are arranged between the base and the end cover and abut against counter bores in the endcover through springs arranged in inner holes of the base.

The invention relates to a shipborne piezoelectric energy harvester, and belongs to the piezoelectric power generating technical field; an upper cover is arranged on the housing side wall end portion, and provided with an upper sleeve and a limit ring; the housing side wall is provided with an annular platform, and the housing bottom wall is provided with a lower sleeve, a limit ring and a circuit board; a plunger with an end cap on one end is respectively sleeved in the upper and lower sleeves; the end cap outer rim is provided with an inner magnet ring, and the end face is embedded with beads; a buffer spring and a balancing spring are respectively pressed in the upper and lower sleeves through the plunger; an exciter comprises an isolation plate and exciting rings arranged above and below; the isolation plate and the exciting rings form an annular groove, and an inertia block is arranged in the annular groove; the exciting ring exciting plane is a slope inclining to the exciting ring inner side; the exciting ring inner wall is provided with an outer magnet ring, and same magnetic poles of the outer magnet ring and an inner magnet ring are arranged in opposite; the isolation plate top and bottom respectively abut against the plunger end caps in the upper and lower sleeves through the beads; the housing annular platform is provided with two piezoelectric oscillators separated by an isolation ring, and the piezoelectric oscillator end face abuts against the exciting plane.

The invention relates to a shipborne positioning device, which belongs to the technical field of ship equipment. An end cover provided with a limiting ring is arranged on the side wall of a main body; the side wall of the main body is provided with a ring table, the bottom wall is provided with a circuit board and an exciter base, and the circuit board is provided with an energy conversion circuit and an information transmitting system; the exciter base is provided with a swinging rod; the end part of the swinging rod is provided with a disc; an excitation cylinder is arranged on the disc; an inertia block is arranged on the disc; multiple groups of piezoelectric vibrators are arranged on the ring table, and the groups of piezoelectric vibrators are separated by separation rings; a substrate and a piezoelectric plate are bonded to form each piezoelectric vibrator, and the piezoelectric plate is arranged close to the bottom wall of the main body; the free end of the substrate is provided with a substrate flange bent towards one side of the piezoelectric plate, and the substrate flange abuts against the excitation cylinder; the piezoelectric vibrator has a flat structure before mounting and has a bent structure after mounting, and the deformation amount of the free end of the piezoelectric vibrator group with the shortest length is half the allowable value in non-working time; and when the excitation cylinder and the limiting ring are contacted, the maximum deformation amount of the piezoelectric vibrator group with the shortest length is smaller than the allowable value.

The invention discloses a main load-bearing structure suitable for a ballistic reentry recovery capsule, and belongs to the technical field of load bearing of a recovery capsule. The main load-bearing structure suitable comprises a head shell, a stabilizing flare, a flare bottom, an instrument panel, a transition bracket, a support base, a platform, a parachute bay device and a pull rod, wherein two ends of the stabilizing flare are respectively butted with the head shell and the flare bottom; the instrument panel is fixed to an upper end frame of the stabilizing flare; the transition bracket is coaxially mounted on the bottom surface of the instrument panel; the platform is connected with the middle bulkhead of the stabilizing flare; the support base is fixed to the upper surface of the platform; the support base is connected with the transition bracket; after a mounting end of the parachute bay device penetrates through the platform, the mounting end is connected with the support base and the transition bracket, and a parachute deployment end is connected with the stabilizing flare through the pull rod after penetrating through the stabilizing flare; a circular gap of the flare bottom is sealed by the spherical surface of the parachute deployment end of the parachute bay device; the structure can bear up under complicated reentry load conditions, meet the requirements of equipment mounting, increase the transversal fundamental frequency of the capsule body, and achieve lightweight design on the premise of satisfying rigidity and strength.

The invention discloses a solar wing and a sectional type secondary unfolding hinge thereof. The secondary unfolding hinge comprises a male hinge body and a female hinge body which are rotationally connected through a hinge shaft. A swing rod is installed at the tops of the two hinge plates through a swing rod shaft, a locking column is fixedly installed on the swing rod, an ejector rod is fixedlyconnected into the female hinge, a linkage wheel and a shifting fork are installed on the hinge shaft on the outer sides of the hinge plates, and the shifting fork is fixedly connected with the linkage wheel. A volute spiral spring is arranged between the male hinge and the female hinge; the male hinge is provided with a locking groove connected with the locking column in a clamped mode. The sectional type secondary unfolding hinge can be automatically unlocked after being locked in place for the first time, and secondary unfolding and locking are achieved.

The invention discloses a high rigidity and light space camera lens cylinder and a test method for vibration resistance stability thereof. The cylinder comprises a cylinder body, a main mirror flange,a secondary mirror flange and a reinforcing rib. The cylinder body is a hollow cylinder. One end of the cylinder body is provided with a main mirror flange for connecting a space camera main mirror,and the other end of the cylinder is provided with the secondary mirror flange for connecting the space camera secondary mirror. The outer side of the cylinder body is provided with a reinforcing ribfor reinforcing the structure. The cylinder body, the main mirror flange, the secondary mirror flange and the rib are integrally formed by three-dimensional braiding silicon carbide. According to theinvention, the overall structure of the lens cylinder is optimized by integrally forming the cylinder body, the flanges and the reinforcing rib through using the three-dimensional braiding of siliconcarbide materials, and the defect that the traditional metal support structure is too heavy and has a large self-expansion coefficient is overcome; by designing the vibration resistance stability testmethod of the lens cylinder structure, the stability of the entire lens cylinder is ensured; and the problem of quite poor stability of the conventional resin-based composite material is solved.

The invention relates to the field of friction stir welding robot structure analysis, in particular to a topological optimization design method for a ram structure of a friction stir welding robot, which comprises the following steps of: 1, analyzing the stress of the ram structure, and determining a ram rigidity condition; 2, conducting topological optimization on the ram structure, specifically,finite element modeling is conducted through software, constraint processing is applied during finite element modeling according to the rigidity condition determined in the step 1, then topological optimization is conducted on the finite element model through software and an SIMP variable density method, and a topological optimization configuration of the ram is obtained; and 3, performing size optimization on the ram topological optimization configuration obtained in the step 2 by utilizing software and adopting an approximate model method. Through topological optimization, the mass of the ram is greatly reduced, meanwhile, it can be guaranteed that the deformation of the tail end of the ram is slowly increased, and the purpose of rapidly improving the fundamental frequency of the ram isachieved.

The present invention relates to a swing type multidirectional piezoelectric energy harvester and belongs to the technical field of piezoelectric power generation. An upper cover is arranged on a shell. The upper cover is provided with a fixed magnetic sheet and a limiting ring. The bottom wall of the shell is provided with a circuit board and a suspension magnet. The left side wall of the shell is provided with a left upper boss and a left lower boss. The right side wall of the shell is provided with a right upper boss and a right lower boss. The two ends of a partition plate with a limiting ring are arranged on the left lower boss and the right lower boss. Each of the left upper boss and the right upper boss is provided with two piezoelectric vibrators and two gaskets, wherein the two gaskets are sandwiched between the two piezoelectric vibrators. The fixed sections of a reed, at the two ends of the reed, are respectively pressed on the left upper boss and the right upper boss between the two gaskets. Between the fixed sections of the reed, a wide spring is connected through a narrow spring. The wide spring is provided with two clamping plates, a movable magnetic sheet and an inertia block. The clamping plates are symmetrically clamped on the upper side and the lower side of the wide spring. The movable magnetic sheet is placed over the wide spring. The small-diameter end of the T-shaped inertial block is fixed on the clamping plate fixed below the wide spring, and the large-diameter end of the T-shaped inertial block is provided with a suspended magnet. The substrates of the piezoelectric vibrators are positioned closer to the gaskets and the free ends of the piezoelectric vibrators abut against the clamping plates.

The invention relates to a flag-swinging excitation wind energy gatherer, and belongs to the new energy field. The flag-swinging excitation wind energy gatherer is characterized in that a semiaxis and a sensor are arranged over the disk body of a swing disk; a boss is arranged at the center below the disk body, and a ring table is arranged at the outer rim of the disk body, and a circuit board is arranged below the disk body; a canvas frame sleeve sleeves the semiaxis, and can rotate around the semiaxis, and canvas is arranged on the sleeve; the center of two magnets which are symmetrically arranged below the base plate and the center of the sensor are arranged at the same circumference; a housing is arranged on a pedestal; a connection board of an exciter is arranged on the boss of the pedestal; a swing rod is arranged on the connection board; an excitation disk is arranged on the swing rod; a stud is arranged on the excitation disk; and the stud is in threaded connection with the boss of the swing disk; generation units are uniformly arranged on the side wall of the boss of the pedestal, wherein the free end of each bearing spring contacts the outer edge of the excitation disk, but has no interaction force; each piezoelectric vibrator is an arc structure which is formed through bonding of a substrate and a piezoelectric patch; the bending radius of the substrate is less than the bending radius of each piezoelectric patch; the substrate is arranged in a manner of approaching to the bearing spring; and the free end of the substrate presses against the bearing spring.

The invention relates to the technical field of spaceflight, in particular to an integrated-type solar-wing supporting mechanism. The problems that a supporting mechanism is complex in structure and prone to being subjected to non-coaxial jamming are solved. A satellite supporting seat, a first short supporting pipe, a first strip-shaped spring, a first long supporting pipe, a second strip-shapedspring, a second long supporting pipe, a third strip-shaped spring, a second short supporting pipe and a solar-wing supporting seat are glued sequentially. The satellite supporting seat is fixed to asatellite body, and the solar-wing supporting seat is fixed to a solar wing. The inner surfaces of the first strip-shaped spring, the second strip-shaped spring and the third strip-shaped spring are glued. The integrated-type solar-wing supporting mechanism further comprises six sealing rings which are glued on the outer surfaces of the two ends of the first strip-shaped spring, the second strip-shaped spring and the third strip-shaped spring in a one-to-one-correspondence mode. The number of structural parts of the supporting mechanism is small, the structure is simple, self-expanding and self-locking can be achieved, the non-coaxial jamming phenomenon is not prone to occurring when one or more supporting mechanisms are used simultaneously, the reliability is high, the expanding rigidityof the solar wing is improved, and the fundamental frequency of optical satellite solar wing expanding is increased.

The invention relates to a concrete faced rockfill dam face plate disengaging and positioning detection method based on a vibration sensing technology. The method comprises the steps of: firstly determining whether the lower part of a face plate is disengaged or not; determining a lower void position of the face plate; and when the face plate has a void part, determining the void position by comparing the difference of the vibration signals of the measuring points in each detection area, and finally, visually displaying a detection result in an image mode. The device has the characteristics ofthe light weight, the convenience in installation, the easiness in operation and capability of achieving disengagement positioning of the face plate.

The invention discloses a spatial six-degree-of-freedom magnetic suspension vibration isolation platform, and belongs to the technical field of space payload vibration isolation. According to the platform, the problems that an existing magnetic suspension platform is large in occupation space, complex in structure and low in integration degree are solved. Four coil arrays are correspondingly located between four upper permanent magnet arrays and four lower permanent magnet arrays, a connecting cylinder penetrates an area defined by the four coil arrays, each permanent magnet array comprises apermanent magnet with a horizontal magnetic pole direction and a permanent magnet with a vertical magnetic pole direction, and during operation, the coil arrays receive an Lorentz force effect in thehorizontal direction and the vertical direction in a magnetic field generated by the upper permanent magnet arrays and the lower permanent magnet arrays, and control over motion in the horizontal direction and the vertical direction is achieved. By utilizing electromagnetic drive, six-degree-of-freedom actions can be achieved. The mechanism is quick in response, easily realizes high-precision control, and effectively suppresses low-frequency vibration. The structure is less in component, simple in structure, high in integration degree, small in occupied space, light in product weight and easyto disassemble and maintain.

The invention relates to a piezoelectric fan with laminating type blades. The piezoelectric fan comprises an elastic metal sheet and a piezoelectric ceramic sheet, wherein the piezoelectric ceramic sheet is bonded and fixed on the edge of one side of the elastic metal sheet, an upright support is arranged on the other side surface of the elastic metal sheet, and a thin film is arranged on one-quarter to one-half position of the upper portion of the support; the elastic metal sheet and the upright support form a L-shaped framework; and the material of the support is a PMMA organic material, andthe material of the thin film is polytetrafluoroethylene. The two sides of the piezoelectric ceramic sheet are connected to the positive electrode and the negative electrode of an alternating-currentdriving power supply, a power supply provides alternating voltage which is consistent with the system resonant frequency, and the piezoelectric ceramic sheet expands and contracts under the alternating voltage and then is subjected to displacement amplification through the L-shaped framework, so that wind sweeping and heat dissipation is realized on the thin film. According to the piezoelectric fan with the L-shaped framework laminating type blades, a grid-shaped support and the thin film are adopted to form a framework laminating type structure, so that good air impedance matching is realized, the end mass is not increased, air sweeping areas are increased, and the efficiency of air outlet and heat dissipation of the piezoelectric fan is improved.

An elbow-shaped longitudinal beam and a space extension arm. The elbow-shaped longitudinal beam is divided into left and right parts with the elbow as the center. The two parts share a middle hinge box, and each part includes a carbon fiber tube, an elbow joint torsion spring, and a rolling bearing. , synchronous gear, sliding bearing, shaft 1, toothed joint 1, shaft 2, guide rod and toothed joint 2; the left and right parts are meshed by synchronous gears; the synchronous gears of each part are installed in the middle of the middle hinge box through shaft 1 Sliding bearings are installed between the shaft one and the synchronous gear; the toothed joint one is installed on both sides of the middle hinge box through the shaft two, and meshes with the above synchronous gears, and the rolling bearing is installed between the toothed joint one and the second shaft; the toothed joint One is connected to one end of the carbon fiber tube, and the other end of the carbon fiber tube is connected to the tooth joint two; the elbow joint torsion spring is installed on the shaft two through the guide rod, and one torsion arm of the elbow joint torsion spring is limited by the middle hinge box, and the other A torsion arm is limited by a toothed joint.

The invention relates to a bicycle positioning and tracking device, and belongs to the technical field of bicycles. A hanger is mounted on a bicycle crossbeam, a hanger end cover is mounted at the end of the side wall of a main body, and a circuit board and a suspended magnet are mounted on the bottom wall of the main body; a limiting plate is mounted on a lower ring table on the side wall of the body, two groups of piezoelectric vibrators and leaf springs are mounted on an upper ring table, the piezoelectric vibrators are located on the upper and lower sides of the leaf springs, and spacer rings are welded between the piezoelectric vibrators and the leaf springs by pressure; the spacer rings are welded on outer ring leaves of the leaf springs by pressure, and the outer ring leaves are connected with inner wafers; pressure plates are mounted on the upper and lower sides of the inner wafers; the upper end of an inertia block is fixed on the pressure plate below the leaf springs, a hung magnet is mounted at the lower end of the inertia block, the hung magnet and the suspended magnet are mounted in such a manner that the same poles are opposite, and both the hung magnet and the suspended magnet are circular magnets; the two pressure plates, the inertia block and the hung magnet constitute an exciter; the piezoelectric vibrator is a sector-shaped or oblong cantilever beam formed by sticking a substrate with a piezoelectric sheet; the substrate is mounted close to the leaf spring, and the free end of the piezoelectric vibrator presses against an exciting ring.

A processing method for a quartz resonator wafer, the quartz wafer is processed according to the following steps: 1. metallization film: use a film coater to plate chromium on the wafer plate, then gold-plate it, and finally deposit it on the wafer plate surface in the form of a thin film, The vacuum degree of the coating machine is 0.35-0.45Pa, the sputtering power of gold is 0.65kW, and the sputtering power of chromium is 0.4kW; Ⅱ. Spray coating Ⅲ. Soft baking Ⅳ. Mask alignment and exposure; Ⅴ. Baking after exposure ; Ⅵ. Development; Ⅶ. Hard film baking; Ⅷ. Removal of metal film; Ⅸ. BOE corrosion. Ⅹ. Removing the photoresist; Ⅺ. Repeating steps Ⅱ‑Ⅷ; Ⅻ. Splitting; ⅩⅢ. Etching and cleaning; the wafer is placed in an etching machine, etched by an etching solution, and then rinsed and dried. The invention breaks through the limit of 30 μm thickness of mechanical grinding wafer, about 55 MHz, and has better corrosion effect.

The invention discloses a magnetic levitation UHPC box girder. The box girder comprises a box girder top plate, a box girder bottom plate and a box girder web arranged between the box girder top plateand the box girder bottom plate; box girder transverse ribs are arranged between the box girder webs in the transverse direction at intervals, the top of each box girder transverse rib is fixedly connected with the box girder top plate, the two transverse ends of each box girder transverse rib are fixedly connected with the inner sides of the box girder webs respectively, and the box girder transverse ribs are located in a pressed area of the box girder top plate to prevent warping instability of a thin plate; the box girder top plate, the box girder bottom plate and the box girder web are all made of UHPC materials so that the beam height and thicknesses of the box girder top plate, the box girder bottom plate and the web are reduced. The box girder is suitable for maglev transportation,the top plate, the bottom plate and the web of the box girder are made of UHPC materials, meanwhile, thicknesses of the top plate, the bottom plate and the web of the box girder are reduced, rigidityis improved, the strict deformation requirement of high-speed maglev for a bridge structure is met, meanwhile, the section square amount is reduced, construction is convenient, and the use amount ofa lower structure is reduced; the transverse ribs and the transverse partition plates are made of common concrete, so the structure cost is reduced.

The invention provides a large-size high-fundamental-frequency light-weight surface tension storage tank, which comprises a cylindrical section (1), two middle partition plates (2) welded inside the cylindrical section (1), a gas shell (3) welded to the upper end of the cylindrical section (1), a liquid shell (4) welded to the lower end of the cylindrical section (1), a management device (5) welded to the two middle partition plates (2), the gas shell (3) and the liquid shell (4), and a gas nozzle (6) and a liquid nozzle (7) welded to the two ends of the management device (5). According to theinvention, the on-orbit whole-course multidirectional task working requirements can be met; the whole fundamental frequency of the storage tank is high, the sensitive frequency band of the whole satellite is effectively avoided, and the mechanical resistance is good; dynamic simulation calculation is adopted, the structural design is optimized, and the overall mass of the storage tank is relatively low.

The invention discloses a sliding unfolding system suitable for a large space fixed-surface antenna. The sliding unfolding system comprises a fixed-surface antenna, a drive sliding system, unlocking devices and locking mechanisms, wherein the fixed-surface antenna is a plane or a cylindrical paraboloid after being unfolded and is formed by stacking a plurality of equant panels; the drive sliding system comprises a motor, a steel wire rope, a rope winding drum, fixed pulleys, idler wheels and transition blocks; the unlocking devices include interlayer unlocking devices, the transition blocks and interplate unlocking devices; the locking mechanisms are interplate locking mechanisms; various panels are unfolded and then connected through the interplate locking mechanisms; the rope winding drum is arranged at one end of the lowest panel; the motor drives the rope winding drum to rotate; and the rope winding drum, the steel wire rope and the fixed pulleys form a series drive system. The fixed-surface antenna is sequentially deployed by adopting a series order; a traditional hinged unfolding mode is broken; the closing space is reduced to adapt to carrying enveloping; and the sliding unfolding system has the characteristics of being small in overall envelope, few in drive sources, small in locking impact and high in locking rigidity.

The invention discloses a basic deployable unit based on a Bennett mechanism and an unfolding mechanism constituted by the basic deployable unit, and belongs to the technical field of satellite antenna structures. The problem that the unfolding performance of an existing Bennett mechanism is poor is solved. A first connecting rod is rotatably connected with a second connecting rod, a third connecting rod is rotatably connected with a fourth connecting rod, the second connecting rod is rotatably connected with the third connecting rod, the first connecting rod is rotatably connected with the fourth connecting rod, the central axis of a first revolute pair and the central axis of a third revolute pair are located on a first plane, the central axis of a second revolute pair and the central axis of a fourth revolute pair are located on a second plane, the first plane is perpendicular to the second plane, a slide block reciprocates in the length direction of a guide rod, the central axis ofthe first revolute pair is perpendicular to the central axis of a fifth revolute pair, the central axis of the third revolute pair is perpendicular to the central axis of a sixth revolute pair, and the basic deployable unit is in an X shape in an unfolded state, is in an umbrella shape in a half-closing state, and is in an I shape in a complete closing state.

The invention discloses a general vibration test fixture for track traffic electrical equipment and an installation method of the general vibration test fixture. The general vibration test fixture comprises an assembly part I and an assembly part II, and both the assembly part I and the assembly part II are formed by welding or integrally casting soleplates and vertical plates. The general vibration test fixture disclosed by the invention is characterized in that reinforcing ribs are arranged between the vertical plates and the soleplates, so that the integral rigidity is increased; the vertical plates of the assembly part I and the assembly part II are respectively provided with a T-shaped slot and long through holes I in the back and force direction (X direction), so that the installation requirement of screw holes in different spacings is satisfied; the soleplates of both the assembly part I and the assembly part II are provided with long through holes II in the left and right direction (Y direction), so that the installation requirement of screw holes of vibration table surfaces in different spacings is satisfied, therefore the generality of the fixture for track traffic electrical equipment of a base-mounted type is achieved. The general vibration test fixture disclosed by the invention is low in cost, high in resonance frequency, small in volume, light in weight, good in rigidity, convenient in installation and high in work efficiency, thereby having higher economic usefulness.

The invention discloses a high-precision, large-range optical NEMS micro-accelerometer based on monolithic integration, which is composed of an acceleration sensitive system and an optical displacement measurement system. The acceleration sensitive system consists of a grating on a monolithic SOI, four cantilever beams and the substrate; the optical displacement measurement system includes a laser, a photodetector, an upper substrate layer, a support and connection part, a processing circuit and a computer; the grating is used as an optical modulation element in the optical displacement measurement system, and as an acceleration sensitive system. The role of the quality block is eliminated; the micro accelerometer of the present invention has utilized the single-chip integrated NEMS acceleration sensing system to realize the linear acceleration sensitivity of a large dynamic range, and has utilized the interference phenomenon of the diffraction grating and the Wood anomaly of the sub-wavelength grating to realize a large High displacement measurement sensitivity, combining the two systems can achieve acceleration measurement with high precision and large dynamic range.

The invention relates to a two-degree-of-freedom flexible joint in the whiffletree support structure of a large-diameter reflector, including: a flexible joint body and a lower end flange; the flexible joint body includes: an upper end flange, an upper sheet, and an orthogonal sheet transition method Lan, lower sheet; upper sheet and lower sheet are arranged orthogonally. The two-degree-of-freedom flexible joint in the whiffletree support structure of the large-diameter reflector of the present invention is based on the original structure of the two-degree-of-freedom flexible joint, and four sets of stoppers and eight sets of needle roller bearing positioning block assemblies are added to effectively limit the The rotational freedom Rz of the two-degree-of-freedom flexible joint around the axial direction of the flexible joint obtains a true two-degree-of-freedom flexible joint, which makes the engineering design structure completely consistent with its structural principle, and at the same time effectively improves the fundamental frequency of the whiffletree structure.

The invention provides a two-dimensional adjustable mirror frame based on curved surface positioning. The solution includes a main mirror frame, a locking ring and a mirror frame; the mirror frame is sleeved in the main mirror frame; one side of the mirror frame is connected with the main mirror frame, and One side is covered with a locking ring; the inner edge of the main mirror frame is provided with internal threads; the outer edge of the locking ring is provided with external threads matching the internal threads of the main mirror frame; the locking ring and the main mirror frame are threaded connected; lenses are arranged in the frame. This solution can solve the problem of low structural rigidity in the two-dimensional adjustable optical mirror frame, which makes it difficult to improve the anti-resonance stability of the mirror frame, especially the problem of resonance amplification for low-frequency vibrations. Practice shows that the invention can effectively improve the fundamental frequency of the frame structure, and at the same time ensure the precise two-dimensional angle adjustment of the lens around the x-axis and y-axis, and improve the stability of the frame structure.