10results about How to "Strong engineering applicability" patented technology

The invention relates to the technical field of infrared optical materials, and particularly discloses a large-size high-resistance infrared silicon single crystal and a preparation method thereof. The doping concentration of cobalt oxide in the large-size high-resistance infrared silicon single crystal is 10 ppm to 100 ppm, and the atomic concentration of phosphorus in the large-size high-resistance infrared silicon single crystal is 2 * 10 < 13 > / cm < 3 > to 6 * 10 < 13 > / cm < 3 >. The oxide of transition metal cobalt and phosphorus impurities are doped into the infrared silicon single crystal, carriers of cobalt and phosphorus and carriers of impurities such as boron and oxygen generate a recombination effect, so that the concentration of free carriers in the silicon single crystal is reduced, and the absorption coefficient of the doped silicon single crystal is relatively small; the infrared transmittance of the silicon single crystal in a medium wave band can be obviously increased, the resistivity can reach 600 omega.cm or above, and the use requirement of the infrared silicon single crystal in a high-performance infrared optical system can be met.

The invention provides a multi-degree-of-freedom active electromagnetic vibration isolator and a vibration isolation system, an end cover assembly of the vibration isolator comprises a central iron core wound with a central coil and a top plate, the central iron core is arranged on the top plate, a horizontal electromagnetic force assembly comprises a plurality of armatures wound with outer coils and first height adjusting cushion blocks, the armatures are arranged on a base through the first height adjusting cushion blocks, and the armatures are arranged on the base through the first height adjusting cushion blocks. All the armatures are arranged around the central axis of the end cover assembly, the included angle between every two adjacent armatures is 90 degrees, and the end faces of the armatures all face the central axis of the end cover assembly. The vertical electromagnetic force assembly comprises a plurality of magnetic conduction pieces and second height adjusting cushion blocks, permanent magnets are embedded in the inner sides of the magnetic conduction pieces, the magnetic conduction pieces are arranged on the base through the second height adjusting cushion blocks, all the magnetic conduction pieces are arranged around the center axis of the end cover assembly, and the included angle between every two adjacent magnetic conduction pieces is 90 degrees. The active vibration isolation force is adjusted by means of control currents in all coils in the electromagnetic assembly, vibration generated by large power equipment can be effectively restrained, and the multi-degree-of-freedom vibration isolation device is suitable for a multi-degree-of-freedom vibration isolation system with different requirements for the vibration isolation effect.

The invention provides a permanent magnet composite multi-degree-of-freedom active electromagnetic vibration isolator and a vibration isolation system, and belongs to the field of vibration isolators, the vibration isolator comprises an electromagnetic assembly, a chassis assembly, a permanent magnet assembly and an end cover assembly, and the electromagnetic assembly comprises an iron core and a coil; the chassis assembly comprises a base, a bottom shell, a damping backing ring, a positioning column and a bearing spring, and the damping backing ring is arranged in a gap between the base and the bottom shell; the permanent magnet assembly comprises a permanent magnet, a magnetic conductive piece, a positioning frame and annular table pieces. The annular table piece located at the lowest position is connected with the bottom shell through a bearing spring. The end cover assembly comprises a top shell, an adjustable spring seat, an adjusting spring, a guide bolt and a guide nut. The active vibration isolation force is effectively adjusted through the control current of each coil in the electromagnetic assembly, and the active vibration isolation device has the characteristics of being high in response speed, stable in output and reliable in work, is suitable for a multi-degree-of-freedom vibration isolation system and can meet different vibration isolation requirements; and the equipment can be adjusted to the optimal vibration isolation performance without dismounting the vibration isolator.

The invention relates to a rapid charge supply device for spacecraft pulse charge emission, and belongs to the field of space charging and discharging. The bottom plate is of a plate-shaped structure which is horizontally arranged in the axial direction; the cathode is of a cylindrical structure; the cathodes are in coaxial butt joint; the anode is of a cylinder structure; the anode is coaxially arranged in the inner cavity of the cathode; the root of the anode is butted with the bottom plate; the working medium sleeves the outer wall of the middle part of the anode and is filled between the cathode and the anode; the spring is sleeved on the outer wall of the anode root; one end of the spring is contacted with the bottom plate; one end of the spring contacts with the working medium end face; the insulating assembly is arranged at the opening of the axial head end of the cathode; two poles of the energy compression module are respectively connected with the cathode and the anode; the power supply is connected with the energy compression module to charge the energy compression module; a charge self-consistent cavity is formed on the outer side of the opening of the axial head end of the cathode; when the device is used for spacecraft pulse charge beam output, rapid supply in the pulse is achieved, and the spacecraft is kept electrically neutral in real time.

The invention provides a patch type piezoelectric driving two-degree-of-freedom mechanical arm and a driving method thereof. The mechanical arm comprises a plurality of unit arm sections connected in sequence and connecting assemblies between the arm sections. During working, driving signals with pi / 2 phase differences are applied to the piezoelectric vibrators on the unit arm sections, so that the points, making contact with the adjacent piezoelectric vibrators, of the piezoelectric vibrators generate micro-amplitude elliptical motion, and driving force is generated through the friction effect; the rotation of the unit arm sections around the piezoelectric vibrators of the adjacent unit arm sections and the rotation of the unit arm sections around the axes of the piezoelectric vibrators of the unit arm sections can be realized respectively, and the two-degree-of-freedom rotation of the two arm sections in two orthogonal planes can be realized due to the fact that the unit arm sections and the adjacent unit arm sections are spatially orthogonal. The mechanical arm is easy to seal, microminiaturization is achieved, electromagnetic interference is avoided, self-locking can be achieved in the power failure process, modal coupling frequency consistency adjustment of different phase modals is not needed, and the limitation on the design size, shape and the like of the mechanical arm is reduced.

This invention discloses an azeotropic phase change cooling rotor assembly, a Roots compressor, and a vacuum pump. The rotor assembly includes a main rotor with circumferentially shaped through-holes and an axially oriented internal through-hole on the rotor shaft. A first and a second auxiliary rotor are mounted at both ends of the main rotor. Rotor sealing plates are arranged on the inner sides of the two auxiliary rotors to seal the shaped through-holes and form a first azeotropic flow region. One end of the rotor shaft is connected to a drive motor, and the other end connects to a swirl cooling pipe with swirl fins on its outer wall, forming a second azeotropic flow region through end sealing. The first and second azeotropic flow regions are filled with an azeotropic phase change cooling medium. This invention is based on the azeotropic phase change heat transfer principle and combines a swirl cooling structure to achieve efficient heat dissipation. The overall structure is simple and compact, eliminating the need for complex cooling equipment, effectively suppressing rotor temperature rise during operation, and avoiding rotor jamming caused by high-temperature thermal expansion.

The invention relates to an aero-engine power divider shaft protective cover mounting structure with a damping function, which comprises a split protective cover, and a hoop is sleeved on the split protective cover; the hoop comprises a holding ring, the two ends of the holding ring are tightly attached connecting plates, and connecting through holes are formed in the connecting plates. The middle part of the holding ring is an annular plate; a metal rubber bushing ring is attached to the inner side of the annular plate; the hoops are screwed through screws and nuts to fix the split type protective cover, the embracing ring and the metal rubber lining ring are completed through the spot welding technology, spot welding positions are evenly distributed between the embracing ring and the metal rubber lining ring, and the hoops are arranged on the split type protective cover in a sleeved mode and located at the front end, the middle end and the rear end of the split type protective cover. According to the invention, by utilizing the vibration reduction characteristic of the metal rubber, the vibration reduction requirement of the installation and fixation of the existing aviation FDJ power divider shaft protection cover is realized; the metal wires in the metal rubber bushing ring are directly made of stainless steel materials, do not need special treatment to meet the requirements of the use environment, and are fixed on the original hoop through spot welding.

This invention discloses a self-sensing flange gasket for structural health monitoring of pipeline systems. The flange gasket consists of functional components and signal transmission circuit components. The functional components have a three-layer concentric ring contact structure, including a sealing inner ring layer, a leakage detection middle ring layer, and a sealing reinforcement outer ring layer, used to achieve the sealing and condition monitoring functions of the flange gasket. The signal transmission circuit components include an inner ring edge electrode layer and a middle ring planar interdigitated electrode layer, used to acquire and transmit electrical signals from the flange gasket. All components use flexible PDMS as the base material to ensure the elastic deformation sealing capability of the flange gasket, while the self-adhesive properties of PDMS are used to achieve seamless assembly between the layers. This invention, through a multi-functional layer modular design, utilizes multi-dimensional electrical signal changes caused by different physical parameters to achieve simultaneous detection of fastening pressure and leakage components, thus meeting the engineering requirements for condition monitoring of pipeline systems.

The invention belongs to the technical field of power electronic system control, and particularly relates to a bridge arm energy balance control method of a modular multi-level converter, which comprises the following steps: generating a direct current bus current reference value for representing the direct current side energy regulation requirement of the modular multi-level converter; in combination with the energy state of each bridge leg, generating a bridge leg current reference value corresponding to each bridge leg by using a bridge leg current reference value distribution strategy; generating mutually independent bridge leg common-mode voltage modulation signals of the bridge legs; based on a common-mode modulation signal energy rectification distribution strategy, performing energy rectification type distribution in the bridge legs, and generating common-mode voltage modulation signals corresponding to the upper bridge arm and the lower bridge arm; the differential mode voltage modulation signals are combined with differential mode voltage modulation signals generated by alternating current side control to generate bridge arm voltage modulation signals corresponding to the bridge arms; trigger pulses of all sub-modules in the bridge arm of the modular multilevel converter are generated through a modulation method, and controlled adjustment of the energy of the bridge arm is achieved.

The present invention relates to a method for constructing a fluid-solid coupling reduced-order model based on digital twins, which includes: establishing physical models of fluid domain and solid domain, processing the mesh common nodes and performing mesh division, suppressing the solid domain model, simulating and solving the full-order model of the fluid domain mesh, using the inlet velocity as the excitation and the pressure change of the fluid-solid coupling surface as the output response to construct the fluid reduced-order model; suppressing the fluid domain model, simulating and solving the full-order model of the solid domain mesh, also using pressure as the excitation and stress and displacement as the output response to construct the solid reduced-order model; using the pressure change response output by the fluid reduced-order model as the input excitation of the solid reduced-order model, a fluid-solid coupling reduced-order model combining the fluid reduced-order model with the solid reduced-order model can be obtained. Compared with the traditional fluid-solid coupling method, the present invention can shorten the calculation time of the fluid-solid coupling reduced-order model from hours to seconds.