579 results about "Dynamic pressure" patented technology

The invention provides a tunnel surrounding rock grouting control method and system, and relates to the technical field of tunnel engineering.The tunnel surrounding rock grouting control method comprises the steps that grouting parameters are obtained, and the grouting parameters comprise grouting pressure and slurry viscosity; performing multi-dimensional real-time monitoring on the surrounding rock fracture, and constructing a dynamic three-dimensional geologic model through the multi-dimensional real-time monitored data; performing grout diffusion path prediction based on the three-dimensional geologic model, and generating an initial grouting scheme through the predicted grout diffusion path; the fractal dimension is optimized according to a genetic algorithm, the grouting parameters are dynamically corrected through the optimized fractal dimension, and a grout diffusion result is obtained; establishing a multi-field coupling equation based on the slurry diffusion result, and optimizing the initial grouting scheme through the multi-field coupling equation to obtain an optimal grouting scheme; and according to the optimal grouting scheme, power pressure compensation is conducted, and grouting control is conducted. The problem that slurry diffusion is difficult to accurately control is solved.

The invention relates to the technical field of monitoring, in particular to a method and system for detecting and evaluating the corrosion risk of an offshore wind power steel structure. The method comprises the following steps: acquiring corrosion environment parameters and corrosion response parameters of a corrosion area in the offshore wind power steel structure; according to the corrosion environment parameters and the corrosion response parameters, the real-time corrosion rate of the corrosion area is determined; determining a local stress concentration factor of the corrosion area according to the three-dimensional scanning characteristics of corrosion deposits in the corrosion area; the dynamic pressure parameters of the marine environment serve as dynamic boundary conditions, the real-time corrosion rate and the local stress concentration factor serve as the basis, and the structural rigidity degradation amount of the steel structure in the corrosion area is determined through finite element iteration; according to the structural rigidity degradation amount, the structural safety coefficient of the steel structure in the corrosion area is determined; and determining the corrosion risk of the steel structure in the corrosion area according to the dynamic pressure fluctuation range of the marine environment and the structure safety coefficient of the steel structure in the corrosion area.

There is provided a sliding component that supplies a sealed fluid to a leakage side in a gap between sliding surfaces to exhibit high lubricity and has a small leakage of the sealed fluid. A sliding component that has an annular shape and is disposed in a place where relative rotation is performed in a rotary machine, includes a plurality of dynamic pressure generating mechanisms provided in a sliding surface of the sliding component, each of the dynamic pressure generating mechanisms including a deep groove portion that communicates with a leakage side, and a plurality of shallow groove portions that communicate with the deep groove portion and are arranged in a circumferential direction in parallel relationship to each other.

The invention discloses a pneumatic joint sealing performance intelligent test method and system based on dynamic pressure spectrum and multi-parameter fusion, and belongs to the technical field of pneumatic element sealing detection. According to the method, a dynamic pressure spectrum simulating an actual working condition is applied to a tested joint, pressure, temperature and ultrasonic signals are synchronously acquired, environmental thermodynamic interference is eliminated by adopting a temperature real-time compensation algorithm, and pressure change purely caused by leakage is separated by deducting system baseline data; and finally, fusing double characteristic parameters of the pressure leakage rate and the ultrasonic energy, and comprehensively evaluating the sealing performance through an intelligent judgment model. The system comprises a gas circuit tool module, a multi-sensing module and a control processing module, can effectively solve the problems that a traditional static pressure maintaining method is greatly influenced by temperature, transient leakage cannot be detected and the like, has the advantages of being high in detection precision, high in anti-interference capability, capable of simulating real working conditions and the like, and remarkably improves the test reliability and efficiency.

There are provided sliding components that allow sliding surfaces to smoothly slide against each other regardless of whether a relative rotation direction is a forward rotation or a reverse rotation. The sliding components and include: a pair of sliding surfaces and disposed to face each other at a location where a relative rotation takes place when a rotating machine is driven. The sliding surface is provided with a first dynamic pressure generating groove communicating with a radially outer-side space and extending in one circumferential direction, a second dynamic pressure generating groove extending in the opposed circumferential direction, and a conduit groove communicating with the space. The conduit groove includes an annular groove and a communication groove communicating between the annular groove and the space. The second dynamic pressure generating groove is disposed closer to the space than the annular groove, and communicates with the annular groove.

The invention discloses a pressure adjusting method and system for a pressure air gun for drying, and relates to the technical field of pressure air gun adjusting.The method comprises the steps that pressure distribution data and drying effect parameters of the surface of a dried object are collected in real time; the drying effect parameters are input into a reinforcement learning and quantum annealing collaborative decision model, a dynamic pressure adjusting strategy is generated, and the dynamic pressure adjusting strategy comprises control parameters of a pressure value, a waveform frequency and a nozzle direction; an air gun is controlled to output a target pressure waveform according to the dynamic pressure adjusting strategy, the target pressure waveform is generated based on the 3D geometrical characteristics of the drying object, and the impedance of an internal flow channel of the air gun is adjusted in real time through a magnetorheological fluid strategy; in the drying process, three-section mode switching is triggered according to the real-time water content and surface roughness data, chaos frequency modulation pulse waves are output in the initial stage to peel off water, fractal diffusion waves are switched in the middle stage to achieve uniform coverage, and nanometer resonance waves are adopted in the final stage to complete drying.

The invention provides a compressor intelligent control method and system based on dynamic pressure relief and a storage medium, and the method comprises the steps: firstly, capturing the multi-physical field coupling characteristics of a compressor in a shutdown state in real time by deploying a pressure, temperature, vibration and current four-dimensional sensing network; secondly, based on a preset pressure entropy model, fusing the pressure fluctuation intensity, the temperature anomaly index, the high-frequency vibration factor and the current attenuation coefficient to quantitatively evaluate a pressure entropy value, and triggering a three-stage pressure relief mode based on the pressure entropy value; then, based on the deviation between the cavity pressure and the target pressure, pressure relief parameters are dynamically adjusted, and stable pressure transition is achieved; and finally, collecting full-link data of pressure relief operation, and dynamically optimizing pressure entropy model parameters based on reinforcement learning, so that the system continuously adapts to equipment aging and working condition changes. Through dynamic closed-loop adjustment, pressure relief energy consumption waste and equipment loss are reduced, and the stability of the pressure relief process is improved.

The invention relates to the technical field of electromagnetic valves, in particular to an air pump electromagnetic valve capable of adaptively adjusting displacement, which comprises a valve seat, an electromagnet, an adjusting rod, a valve core and a movable piece, the interior of the valve seat is divided into an outer cavity and an inner cavity, a first communication port is arranged between the outer cavity and the inner cavity, and the movable piece in transmission connection with the valve core is arranged in the inner cavity; the valve element is connected with an adjusting rod in the electromagnet valve element through an elastic assembly, and by adjusting the installation height of the adjusting rod in the armature, it can be ensured that when the valve element is located at the preset position, the second communication opening and the first communication opening in the movable part are mutually staggered, and a throttling opening with the normal opening degree is formed; the valve element drives the movable part to move up and down, and the opening degree of the throttling opening is dynamically adjusted, so that the air outlet pressure is adaptively controlled according to the air inlet pressure, the air outlet pressure is stabilized within the set range, the problem that a traditional electromagnetic valve is difficult to respond to dynamic pressure changes is effectively solved, and constant adjustment of the outlet pressure is achieved.

The invention belongs to the technical field of aero-engine design, and provides a sliding bearing lubrication gap prediction method based on a PINN neural network, and the method comprises the steps: generating a training data set of the PINN neural network, constructing the PINN neural network, employing a reverse mechanism of the neural network, calculating a partial differential operator through automatic differential, and carrying out the prediction of the lubrication gap of a sliding bearing. Customizing a dynamic pressure lubrication Reynolds equation into a loss function in a deep learning framework; and a prediction data set of the neural network model is generated, the trained PINN model and weight parameters are loaded, construction of a prediction model is completed, and an oil film pressure distribution curved surface is generated. According to the method, the accuracy of oil film pressure distribution calculation is remarkably improved, and meanwhile, the speed of numerical calculation can be remarkably increased.

The invention relates to the field of guide bearing bush control, in particular to a signal processing system and method for guide bearing bush clearance automatic adjustment, and the system comprises a clearance metering module, a model boundary module, a fault learning module, a clearance adjustment module and an oil film lubrication module, the model boundary module is used for establishing a dynamic pressure lubrication model of the guide bearing bush and solving the gap of the guide bearing bush, the fault learning module is used for determining the gap adjustment amount, the gap adjustment module is used for adjusting gap distribution, and the oil film lubrication module is used for adjusting lubricating oil injection. And fault identification and automatic fault-tolerant adjustment are carried out, so that mechanical vibration of the bearing is reduced, operation stability of equipment is guaranteed, abnormal bearing bush gaps are avoided, mechanical efficiency of the bearing is improved, invalid power loss is reduced, service life of the equipment is prolonged, thickness and pressure distribution of a lubricating oil film are improved, and performance of bearing turbine equipment is improved.

The utility model discloses a diffusion type exhaust passage structure of double-screw gas conveying equipment, which mainly comprises an air cylinder and an axial exhaust pipe arranged on the air cylinder, and the diffusion type exhaust passage structure of the double-screw gas conveying equipment comprises the specially designed axial exhaust pipe. The direction of the airflow in the pipeline is basically consistent with that of the airflow from the compression cavity, so that mechanical loss caused by rapid turning of the airflow in a traditional structure can be avoided. A guide plate device is specially designed at an inlet of the axial exhaust pipe. Air flow from the compression cavity directly flows into the gaps of the guide plates and moves forwards along the guide plates, and energy loss caused by air turbulence in a traditional structure can be reduced. A plurality of diffusion areas are formed at the inlet of the exhaust pipe by utilizing the guide plate and the inner wall of the pipeline, and the dynamic pressure of high-speed airflow from the compression cavity is converted into static pressure by utilizing the diffusion areas, so that the pressure is increased while the speed is reduced, and the energy loss caused by the high-speed airflow is avoided.

The invention relates to the technical field of automatic control theory application and data center thermal management, and discloses a data center emergency refrigeration control method based on state space model prediction, which comprises the following steps: establishing a thermodynamic cycle state space equation; the refrigeration flow set value change rate and the water return side pressure change amount are obtained, and the dynamic heat exchange sensitivity is determined; monitoring feedback current characteristics of the driving unit, inverting cooling path resistance distribution and updating gain matrix elements; calculating a state prediction information sequence according to the temperature vector prediction deviation, and adjusting a time domain step length; the dynamic heat exchange sensitivity is introduced into prediction logic, controlled variable dynamic pressure retardation is compensated, an emergency refrigeration frequency control instruction is output, fluid fluctuation is converted into sensitivity compensation of a logic level, non-linear dynamic pressure damping of the emergency working condition is effectively impacted, the problems of control overshoot and logic instability caused by physical lag are solved, and the reliability of the system is improved. And the refrigeration response precision at the emergency conversion moment is improved.

The invention provides a flow measurement device and method for an upper plate of a reactor core, and the device comprises a measurement model which is provided with a first to-be-measured drain hole which is scaled down according to the first drain hole; the at least one detection mechanism comprises a detection end, and the detection end is suitable for extending into a first to-be-detected drain hole needing to be measured and moving along a preset route, so that the detection mechanism generates a plurality of dynamic pressure data of a plurality of preset point positions, located on the preset route, in the first to-be-detected drain hole; and the flow calculation module is suitable for calculating the measured flow data of the first drain hole to be measured according to the plurality of dynamic pressure data, and performing proportional conversion according to the measured flow data to obtain the actual flow data of the first drain hole corresponding to the first drain hole to be measured. According to the flow measurement device, accurate measurement flow data can be obtained through calculation according to the dynamic pressure data, and then accurate actual flow data of the first drain hole are obtained.

The invention discloses a dynamic pressure-based carrier rocket grid rudder control method, which comprises the following steps of: according to a pre-launch binding wind field and the speed of a carrier rocket at the current moment, calculating to obtain the relative airflow speed of the carrier rocket at the current moment; according to the current relative airflow velocity of the carrier rocket, calculating to obtain a current dynamic pressure estimated value; according to the dynamic pressure estimation value at the current moment, solving a control law parameter in the grid rudder online variable gain control law to obtain an optimal control law parameter at the current moment; according to the optimal control law parameters at the current moment, a grid rudder swing angle control instruction at the current moment is obtained through calculation, and real-time control over the grid rudder of the carrier rocket is completed. The method can effectively adapt to the rapid change pneumatic environment of the reentry flight section, remarkably reduces the flight deviation, is suitable for various carrier rocket reentry recovery scenes, and has the advantages of being high in engineering practicability, high in control efficiency and the like.

The invention discloses a CO2 directional fracturing target layer crack propagation simulation control method based on flow regulation and control. The method comprises the steps that a plurality of experimental coal samples are manufactured, and drill holes are formed; the fracturing pump inputs CO2 with set flow into the coal sample through the CO2 injection pipeline; the high-frequency dynamic pressure sensor collects fluid pressure data in the coal sample crack; the acoustic emission sensor monitors and obtains the crack initiation moment and crack initiation pressure of the coal sample; the method comprises the following steps: carrying out cracking and crack width monitoring on a coal sample, calculating a theoretical value of crack initiation pressure and a theoretical value of CO2 injection flow of the coal sample, injecting supercritical CO2 fluid into the coal sample, obtaining a first-stage correction coefficient and a second-stage correction coefficient of the CO2 injection flow, and calculating a corrected CO2 injection flow value. According to the method, under the multi-physical-field coupling environment, the crack initiation pressure of the coal body can be accurately measured and calculated, the correlation between the CO2 injection flow and the crack width of the coal body is established, and the CO2 injection flow better meets the actual requirements of field operation through a CO2 injection flow grading correction mechanism.

The invention discloses a power plant intelligent tool management system based on multi-device interconnection, and relates to the technical field of intelligent device management, and the system realizes digital mirroring of hydraulic tools through a tool digital twin module, and synchronizes a use state and a loss condition in real time. Secondly, the tool state monitoring module accurately monitors the external and internal loss conditions of the hydraulic tool through laser scanning and infrared thermal imaging scanning technologies, meanwhile, dynamic pressure fluctuation is monitored in real time in combination with a water hammer effect coefficient, the influence of the water hammer effect on a hydraulic system is effectively recognized, hydraulic parameters are optimized, and the working efficiency is improved. And the damage of the water hammer effect to the tools is prevented, and the safety and durability of the equipment are improved. The secondary monitoring module continuously monitors vibration and resonance states after the self-healing strategy is executed, and once abnormity is recognized, an early warning instruction is generated in time, and emergency recovery and repair measures are taken, so that equipment damage caused by resonance is effectively avoided.

The invention discloses a geological disaster hidden danger point rapid identification method based on aerial survey of an unmanned aerial vehicle, and relates to hidden danger point rapid identification. An airborne camera image sequence, the acceleration and angular velocity of an inertial measurement unit, the propeller rotating speed, the flight height, the wind speed and direction and a machine body vibration signal are collected, and image exposure time is used as a unified time axis; the method comprises the following steps: forming a time sequence sample, establishing rotor underwash near-earth boundary layer momentum entrainment prior based on the time sequence sample, calculating underwash dynamic pressure field time sequence estimation, a particle mobilization probability time sequence and an equivalent micro-attitude disturbance spectrum, performing sub-pixel level optical flow and phase accumulation analysis on an image sequence, performing time cross-correlation with the equivalent micro-attitude disturbance spectrum, and obtaining a target object. Coupling evidence is obtained, joint judgment of the triggering intensity and the coupling degree is carried out, a flight parameter self-adaptive fine tuning strategy is triggered, space risk analysis is carried out on the image after compensation reconstruction, a space risk calibration graph is generated, and geological disaster hidden danger points in a critical stable state can be effectively recognized.

According to the gluing equipment and the air pressure control method thereof, structural innovation is achieved through cooperative feedback of a control module, after the pressure of an airtight cavity is stable, direct communication between the airtight cavity and a working cavity is cut off through a switching valve set to form an independent closed circuit system, and the design thoroughly isolates interference of a compressed air source to the gluing process; according to the method, the technical scheme that when the pressure of the working cavity is reduced to the compensation threshold value, the air compression device is synchronously activated for compensation and the airtight cavity body passage is synchronously activated for reconstruction is innovatively adopted, rapid pressure recovery is achieved, and innovative control logic is constructed through a multi-stage judgment mechanism for presetting the pressure threshold value, the compensation threshold value and the recovery threshold value; and cooperative control of dynamic pressure relief of the airtight cavity and on-demand compensation of the working cavity is combined, so that the anti-interference capability of the system is remarkably improved.

This invention belongs to the field of hydrodynamic air bearing technology, and relates to a hydrodynamic air bearing testing platform. The platform includes a platform body, an X-axis precision fine-tuning moving platform, and a Z-axis precision fine-tuning lifting platform, each fixed to the platform body. A high-speed motor is fixed on the X-axis precision fine-tuning moving platform. The power output shaft of the high-speed motor is connected to a thrust plate. A pressure sensor and a torque measuring instrument measure the force and torque on the axial force output rod and torque output rod, respectively. A bearing mounting base is positioned opposite to the thrust plate and is used to fix the hydrodynamic air bearing to be tested. The X-axis precision fine-tuning moving platform drives the high-speed motor and the thrust plate to move horizontally, while the Z-axis precision fine-tuning lifting platform drives the linear bearing housing and the bearing mounting base to move vertically. This invention's testing platform can accommodate different types of air bearings, and can control the bearing's operating speed and air film thickness in real time, recording the load conditions under different operating states.

The invention discloses a device and a method for testing the performance of a dynamic pressure sensor in a high-temperature environment, belongs to the technical field of pressure measurement, and aims to solve the problem that the dynamic response characteristic and the measurement precision characteristic cannot be quantitatively evaluated when the dynamic pressure sensor performs dynamic pressure measurement in the high-temperature environment. The method comprises the following steps: firstly verifying the characteristics of a tested sensor in a normal-temperature working mode based on a pipe wind tunnel, and then in a high-temperature working mode, utilizing the characteristic that the influence of airflow temperature on the pressure output of the sensor is negligible, according to the in-situ actual measurement output of a post-wave total pressure sensor, and according to the relationship between the post-wave total pressure and the wave-front total pressure, calculating the wave-front total pressure of the tested sensor. And the theoretical value of the high-temperature-state wavefront total pressure is used as a standard given value of the tested sensor adopting a pressure guiding pipe mode in a high-temperature working mode. According to the method, corresponding theoretical support can be provided for the standard pressure and the environment temperature, and the standard pressure and the environment temperature can be adjusted.

The invention relates to the technical field of shale oil exploitation, in particular to a shale oil working fluid displacement device and a reservoir physical property evaluation method. In the shale oil working fluid displacement process, dynamic pressure difference time sequence data corresponding to all moments are obtained, and due to the fact that the viscosity and flow characteristic difference of different fluid media is large, dynamic pressure difference fluctuation is remarkable during displacement; determining the fidelity of the displacement pressure at each moment by analyzing the frequency domain and linear regression characteristics; thirdly, all moments are clustered based on the dynamic pressure difference and the displacement pressure fidelity, and the moments in the same displacement state are clustered into one class; in view of the fact that fixed PID parameters are difficult to adapt to different working fluid medium characteristics and can cause control delay, in a cluster to which the current moment belongs, moment distribution characteristics and dynamic pressure difference time sequence data dynamic estimation characteristics are analyzed, the pressure instability degree and the observation uncertainty are reflected, a preset gain coefficient is adjusted accordingly, more accurate PID control is achieved, and the control precision is improved. And the reliability of subsequent reservoir physical property evaluation is ensured.

This invention relates to the field of research on the operational characteristics of overpressure relief devices, and particularly to an experimental device for measuring the operational characteristics of overpressure relief devices under water hammer conditions. The device includes: a high-pressure air compressor, a frame, a piston accumulator, a quick-opening device, a high-pressure test assembly, and a high-frequency dynamic pressure sensor. This invention enables the measurement of operational characteristics under different pressure rise rate loads caused by water hammer phenomena on a test bench, providing an experimental platform for the research on the operational characteristics of overpressure relief devices under high pressure rise rates. The overall device is simple, quick, and stable. It effectively solves the problem of applying high pressure rise rate loads in current overpressure relief device operational characteristic measurement tests, overcomes the danger of using combustible gas explosions as pressure sources in existing operational characteristic measurement tests, and overcomes the shortcomings of existing test methods, such as long testing times, the need to calculate gas explosion pressure, and the difficulty in accurately controlling the pressure rise rate.

This invention discloses a dynamic pressure-based method for testing and analyzing hammer shock waves in aero-engines, belonging to the field of aero-engine testing and structural strength design. The method first uses a surge-induced pressure method to generate hammer shock waves at the engine inlet. Based on the flow field characteristics of the air intake outlet section (AIP section) during surge, dynamic total pressure and static pressure measuring points are arranged in a combination of circumferential and radial directions. Pressure signals are synchronously recorded using a high-speed data acquisition system, and four characteristic parameters—surge overpressure, overpressure ratio, loading time, and pressure rise rate—are defined to quantitatively analyze the intensity, spatial distribution, and dynamic process of the hammer shock waves. This invention achieves rapid, accurate, and comprehensive characterization of the aerodynamic load of hammer shock waves, providing reliable input loads directly for the strength design of complex structures such as S-curve air intakes, thereby improving aircraft safety.

The invention provides a method for detecting redundancies in an air bearing, which solves the technical problem that the existing dynamic pressure air bearing motor is lack of detection of the redundancies after the air bearing and the motor are assembled, firstly, particles and volatile substances on the surface of the air bearing are removed, and the detection accuracy of the internal redundancies can be improved. A power meter is adopted to measure the power of the motor, the time length is combined, the theoretical motor synchronization time and the minimum starting voltage are determined, the theoretical motor synchronization time and the minimum starting voltage are compared with the actually measured synchronization time and starting voltage, whether redundancy exists or not is determined, and the method is suitable for detecting the redundancy of various types of air bearings; according to the detection method, multiple positions of the bearing can be detected by rotating the output shaft of the motor, and the detection accuracy can be improved; and the method has the advantages of simple operation and wide application range.

The invention relates to the technical field of gas plectrum bearing test appliances, in particular to a technical platform of a gas plectrum bearing test rotor system. The device comprises a basic platform, a balance tire, a turbine shaft, a heat insulation cover, a shaft turbine end positioning accessory, a bearing sleeve set assembly, a shaft pressure end part assembly and an air cylinder. The balance tire is fixedly arranged on the basic platform, and an air inlet is formed below the balance tire; the turbine shaft is installed on the balance tire in an interference fit mode, and the turbine shaft is sequentially sleeved with the heat insulation cover, the shaft turbine end positioning accessory and the bearing sleeve set assembly. The bearing sleeve group is connected with the shaft pressure end part assembly through a pin; an air cylinder is assembled at the rear end of the bearing end part assembly; and a dynamic pressure gas thrust bearing for testing is arranged on the axial pressure end part assembly. According to the technical scheme, the problems of low maximum rotating speed, poor stability and the like of a gas foil bearing technical test platform in the prior art are solved.

The application relates to the technical field of aerodynamic pressure bearings, in particular to an aerodynamic pressure bearing with a damping function and a damping assembly thereof, which solves the problem that when an aerodynamic pressure shaft starts rotating, the lower end of the surface of the aerodynamic pressure shaft and the lower end of the inner wall of the air bearing directly rub, the friction not only causes wear between the aerodynamic pressure shaft and the inner wall of the air bearing, but also produces generated vibration, which further causes instability in the rotating process and other problems. The application comprises an aerodynamic pressure shaft, air dynamic pressure bearings are movably arranged on the two sides of the aerodynamic pressure shaft, support plates are fixedly arranged at the lower ends of the two air dynamic pressure bearings, and air flow passing assemblies are fixedly connected to the two ends of the aerodynamic pressure shaft. Through the elasticity and bearing capacity of the bearing spring, if the overall rotating shaft part has great vibration, the vibration amount is transmitted to the bearing spring, and the vibration is buffered.

To provide a dynamic pressure bearing excellent in bearing rigidity at low cost.SOLUTION: A dynamic pressure generating part P is provided on each of two radial bearings A1, A2 provided at an interval in the axial direction, and a large diameter cylindrical surface 8b having a diameter larger than that of the radial bearings A1, A2 is provided between the radial bearings LA, LA. In the dynamic pressure bearing (bearing member 8) in which the dynamic pressure generating portion P is formed of a concavo-convex surface in which a plurality of dynamic pressure grooves 10 extending in the axial direction and convex hill portions 11 are alternately arranged in the circumferential direction, one radial bearing surface A1 and the large-diameter cylindrical surface 8b are connected via a tapered surface 8c inclined with respect to the axial direction, and the other radial bearing surface A2 and the large-diameter cylindrical surface 8b are connected via a tapered surface 8d having an inclination angle with respect to the axial direction smaller than that of the tapered surface 8b. The dynamic pressure grooves 10 formed in the A2 of the other radial surface are open to the 8d of the tapered surface.SELECTED DRAWING: Figure 4

This invention discloses a hydrodynamic gas thrust bearing with an integrated top and bottom foil, relating to the field of air bearing technology. It can significantly extend bearing life, improve load capacity, and slow down temperature rise. The technical solution of this invention includes several integrated foil sheets fixedly mounted on a thrust back plate. These integrated foil sheets are sequentially connected end-to-end to form a ring, with an overlapping area between adjacent integrated foil sheets. A corrugated foil sheet is provided in the overlapping area, fixedly connected to one of the integrated foil sheets and in contact with the other integrated foil sheet. This invention eliminates the traditional welding connection between the top foil sheet and the bearing back plate, thereby significantly extending the bearing's service life.

The invention discloses a liquid damping shock absorber which comprises an outer shell (6) and a middle shaft (2) and is characterized in that the outer shell (6) is in a barrel shape, the middle shaft (2) is installed at the bottom of the barrel through an axial supporting mechanism (14), a damping barrel is arranged in the outer shell (6) and installed on the middle shaft (2), and the damping barrel is of a cavity structure with an elastic gap in the lower bottom face. The upper end of the middle shaft (2) penetrates out of the center of an upper end cover (3) of the outer shell (6), damping liquid is contained in the outer shell (6), and the liquid level of the damping liquid is higher than the lower bottom face of the damping cylinder. According to the shock absorber, the damping liquid and the damping cylinder are organically combined, the damping cylinder extrudes the damping liquid when the shock absorber is subjected to an external load, vibration energy is counteracted through viscous dissipation and dynamic pressure generated by liquid shaking, gaps can be changed when pressure is received by the porous structure characteristics of the bottom of the damping cylinder, and the flow of the damping liquid penetrating through the gaps is influenced; therefore, the damping of the shock absorber is variable.

The invention discloses a radial and thrust combined sliding bearing for a gear transmission device, and relates to the technical field of bearings. The problems that a common sliding bearing can only bear force in a single direction, radial and thrust bearings need to be arranged at the same time, and light weight and integration of a device are not facilitated are solved. The bearing comprises a bearing body, the bearing body is installed in a bearing box, the bearing body is made of carbon structural steel, a radial positioning piece and an axial positioning piece are arranged between the bearing body and the bearing box, lubricating oil flows to the bearing body through a first channel and flows to a thrust pad through a second channel, and under the action of a rotating gear shaft, the bearing body is driven to rotate. According to the bearing, dynamic pressure liquid friction is established, the effects of radial supporting and axial positioning are achieved, the thrust pads on the two sides of the bearing body can bear axial stress in two directions, radial and thrust bearings do not need to be arranged at the same time, the axial size can be effectively reduced under the condition that the axial space of a gearbox is limited, and integration is better.