12results about How to "Improve anti-overload performance" patented technology

The invention provides a low-temperature drift MEMS piezoresistive pressure sensor and a preparation method thereof. The pressure sensor comprises a first substrate, a second substrate, a first structural layer, a second structural layer and a piezoresistor strip, a first groove is formed in the lower surface of the first substrate, and the second substrate is fixed to the first substrate and seals the first groove; an annular second groove is formed in the periphery of the bottom surface of the first groove; a third groove is formed in the middle of the upper surface of the first substrate; the first structural layer is arranged in the third groove, and the second structural layer is arranged in the second groove; the first structure layer and the second structure layer are made of metal; the upper surface of the first substrate is provided with a plurality of piezoresistor strips surrounding the first structure layer, and the plurality of piezoresistor strips correspond to the second structure layer. The pressure sensor has the technical effect that the sensitivity and reliability of the pressure sensor are remarkably improved.

The present invention relates to the field of centrifuge structure, and specifically discloses a roll frame for a high-g value three-degree-of-freedom centrifuge, comprising a frame, wherein the frame is an octagonal annular cavity surrounded by an outer skin outer ring, an inner skin inner ring and a cover plate; the frame is symmetrically provided with two roll axis mounting holes, wherein a small shaft sleeve is provided in the roll axis mounting hole, and the side wall of the frame perpendicular to the line connecting the two roll axis mounting holes is provided with two pitch axis mounting holes, wherein a large shaft sleeve is provided in the pitch axis mounting hole; and a plurality of threading tubes are provided in the cavity between the outer skin and the inner skin. The advantages of the present invention are that the roll frame's outer shape structure, box cross-sectional structure, local structure and wiring method are improved and designed to improve the roll frame's overload resistance, rigidity and load-bearing capacity, and reduce the eccentricity of the roll frame, so that it can be used in a high-g value three-degree-of-freedom centrifuge.

The utility model discloses an inverted MEMS force sensor chip which is characterized in that the inverted MEMS force sensor chip comprises a stress layer, a sensitive film and a supporting frame, and the two opposite faces of the stress layer and the sensitive film are connected with the upper surface and the lower surface of the supporting frame; at least one force transmission column is arranged in a containing space formed among the stress layer, the sensitive film and the supporting frame, and the at least one force transmission column is connected with the two opposite faces of the sensitive film and the stress layer. The chip is fixed, the electric signal leading-out surface is separated from the stress surface, and the reliability of the device is improved.

The invention relates to an instantaneous large overload resistant spacecraft structure, which comprises: a main body structure, which comprises a plurality of bearing columns, the outer surfaces of which define a revolution body and are configured to bear an overload impact force; the support beams are arranged between every two adjacent force bearing columns and are configured to provide mounting points for the single aircraft; the end connecting structures are located at the two ends of the main body structure and provided with first threads. The spacecraft structure adopts a gyration body configuration, the stability and strength of the structure are effectively improved, the transverse rigidity of the structure is increased through the gyration body structure, the pointing precision of the spacecraft is effectively improved, the critical yield load coefficient of the structure is increased, and the problem that the structure is damaged due to configuration instability when subjected to large overload impact is solved; and uniform stress of the structure is ensured when the structure bears instantaneous overload, and damage caused by stress concentration is avoided.

The invention relates to a piezoresistive triaxial accelerometer preparation method, which comprises the following steps of: 1, manufacturing a cavity (4) and a Z-axis direction stopper (5) on a double-polished silicon wafer (1); 3, the double-polished silicon wafer (2) and the double-polished silicon wafer (1) are bonded together, and X-axis, Y-axis and Z-axis sensitive structures (7, 8 and 9) and X-axis, Y-axis and Z-axis stoppers (10 and 11) are manufactured; 4, manufacturing a piezoresistive structure (12) and a lead (13) on the double-polished silicon wafer (2); 5, a cavity (14), a Z-axis backstop (15) and a through hole (16) are manufactured on the double-polished silicon wafer (3), and the through hole is filled with poly silicon (18); and 6, bonding the double-polished silicon wafers (3, 2, 1) to form the piezoresistive triaxial accelerometer provided by the invention. The accelerometer has the advantages that stress mismatch between different materials is avoided by adopting the all-silicon structure, the anti-overload capacity of the accelerometer is improved by the stop structure, acceleration sensitive structures in different directions are mutually independent, and interference existing in acceleration detection in different directions is avoided.

The utility model belongs to the technical field of structural health monitoring, and particularly relates to a distributed multi-parameter structural health monitoring system, which comprises a sensor network sensing module, a differential charge amplifier module, a data processing, analyzing and storing module and an early warning module, the sensor network sensing module is connected with the differential charge amplifier module, the differential charge amplifier module is connected with the data processing, analysis and storage module, the data processing, analysis and storage module is connected with the early warning module, and the sensor network sensing module collects multi-parameter data in real time. The differential charge amplifier module is used for conditioning and calibrating an output signal of the sensor network module; the data processing, analysis and storage module processes, classifies and stores the signals, and the early warning module triggers early warning. The system can realize comprehensive, real-time and accurate structural health monitoring for various structures in different industries, such as composite material structures of aircrafts, high-speed rail tracks and bridges, coal mine facilities, mechanical parts, automobile key parts and the like.

The present invention relates to a DC brushless motor with strong magnetic field resistance and high overload resistance, which belongs to the field of motor technology and solves the problem of unstable motor performance under high overload conditions in the prior art. The present invention comprises: a stator assembly, a rotor assembly, a sensor assembly, an end cover and an elastic reset assembly; the rotor assembly is rotatably mounted inside the stator assembly; the stator assembly comprises: a housing, an iron core and a winding formed by laminating silicon steel sheets; the rotor assembly comprises: a shaft and an annular magnetic steel; an elastic reset assembly is arranged between the rotor assembly and the end cover, and the elastic reset assembly is used to buffer the impact load borne by the rotor assembly. The present invention improves the impact resistance of the motor.

The utility model discloses a flange type ventilation plug for civil air defense in the field of ventilation plugs, which comprises a ventilation main pipe, a ventilation branch pipe is bypassed by the ventilation main pipe, main pipe flanges are arranged at two ends of the ventilation main pipe, branch pipe flanges are arranged at the end parts of the ventilation branch pipe, and sealing covers are arranged at ports corresponding to the branch pipe flanges. The sealing cover comprises a cover plate, a blocking column is arranged on the side, facing the branch pipe flange, of the cover plate, external threads are arranged on the periphery of the blocking column, a short guide sleeve is arranged at the end of a column body, a sealing gasket is arranged at the bottom of the short guide sleeve and corresponds to a ventilation branch pipe channel, and internal threads matched with the external threads are formed in the inner wall of the ventilation branch pipe. The outer threads and the inner threads are trapezoidal threads, wear-resistant coatings are sprayed on the surfaces of the outer threads and the inner threads, a sealing groove is formed in the end face, corresponding to the cover plate, of the branch pipe flange, and an elastic sealing ring is arranged in the sealing groove. The core requirements of civil air defense engineering for quick opening and closing, high sealing performance and wartime impact resistance of the ventilation plug are met.

The present invention discloses a high overload resistant pressure sensor, comprising a base and a core body, one end of the base is provided with an inner cavity for installing the core body, the core body is located in the inner cavity, the other end of the core body is provided with a pressure-inducing hole connected to the inner cavity, the pressure-inducing hole is provided with a pressure buffer structure matching the shape of the pressure-inducing hole, the pressure buffer structure is provided with a flow channel for buffering pressure, and the two ends of the flow channel are respectively connected to the pressure-inducing hole and the inner cavity. The present invention has the advantages of simple structure, small size, easy disassembly and assembly, high reliability, good repeatability, strong high overload resistance and modular design.

This application discloses a method and system for optimizing the failure and damage of turbine thrust bearings based on lubrication and load-bearing characteristic analysis, relating to the field of mechanical lubrication. The method includes: establishing a thermo-fluid-structure interaction finite element model; deriving the actual axial load borne by the bearing by measuring the center displacement of the elastic gasket during operation; substituting the actual load into the model and performing lubrication and load-bearing characteristic analysis under typical operating conditions to determine the dominant factors of lubrication degradation; conducting parametric simulations of axial load and lubricating oil inlet temperature based on the dominant factors, summarizing the degradation law of increased load and temperature, and formulating optimization strategies to suppress the failure of turbine thrust bearings. This application improves the targeting and efficiency of turbine thrust bearing failure and damage optimization, and enhances the bearing's overload resistance.

The application relates to a phased array millimeter wave radar seeker integrated structure, wherein the whole radar seeker is divided into a front end module, a data processing module, a power module and a missile nose cone four parts. The phased array front end module is designed in an integrated mode and is positioned and connected with four bosses in the inside of the missile nose cone through screwing; the data processing module is connected and fixed on the upper and lower sides of the data processing module by two different adapter plates respectively, so that the integration and miniaturization design of the seeker are realized, and the existing narrow space is utilized to compactly install the modules.

The application discloses a high-overload-resistance and harmonic-suppression ice-melting rectifier transformer, and relates to the technical field of transformers. The high-overload-resistance and harmonic-suppression ice-melting rectifier transformer comprises an oil tank, the iron core in the oil tank adopts a step-by-step stacking structure and a 45-degree full-inclined joint, and is fastened through a clamping piece module; three coil assemblies and a grounding electric shielding layer are arranged on a core column, the coil assembly comprises upper and lower windings, adopts a <2mm oxygen-free copper wire matched with a K transposition process, and a supporting block is arranged between adjacent wires to form an oil channel; the grounding electric shielding layer is composed of a copper foil shielding plate and a connecting plate and is grounded; and the oil tank forms a circulating heat dissipation system through an oil circuit, an oil pump and an air cooler. Through cooperation of multiple structures, the high-overload-resistance and harmonic-suppression ice-melting rectifier transformer reduces magnetic resistance and loss, improves structural stability, realizes efficient heat dissipation, suppresses harmonic pollution, enhances the anti-overload and anti-short-circuit capability, meets the demand of direct-current ice melting, and guarantees safe operation of a power grid in winter.