832 results about "System pressure" patented technology

A method for starting up vapor-recompression units comprises: providing a vapor recompression sub-system comprising one or more vapor-recompression units, wherein the vapor recompression sub-system has a vapor inlet and a compressed-vapor outlet; providing a means of reducing vapor density through pressure reduction in vapor communication with the vapor recompression sub-system; reducing pressure within the vapor recompression sub-system to reach a sub-system pressure selected from 0.1 kPa to 1000 kPa; introducing a vapor mass flow to the vapor recompression sub-system at a restricted vapor mass flow rate; starting up the vapor recompression sub-system while maintaining the restricted vapor mass flow rate for a start-up time period; and then, following the start-up time period, introducing additional vapor mass flow to the vapor recompression sub-system to reach a full vapor mass flow rate. The restricted vapor mass flow rate is from 0.1% to 90% of the full vapor mass flow rate.

The invention discloses a supercritical fluid assisted polymer devolatilization distributor. The supercritical fluid assisted polymer devolatilization distributor comprises a gradually-shrinking channel, a throttling channel and a gradually-expanding channel which are connected in sequence. A static mixer is arranged in the throttling channel, the upstream pressure is maintained to be above a supercritical state by increasing fluid resistance, meanwhile, the mixing effect of supercritical fluid and polymer melt is enhanced, stable and uniform foam flow is formed, and pressure fluctuation is avoided; an automatic pressure relief valve assembly is arranged on the upper portion of the divergent channel and composed of a valve opening, a valve cover plate, a spring, an adjusting knob and the like, when the system pressure exceeds a set value, exhaust is automatically started, and controllable pressure relief is achieved. A plurality of rows of flow distribution holes are formed in the lower part of the distributor to ensure that the melt uniformly flows out to form stable melt strips; the problems that traditional equipment is difficult to pressurize and not timely in pressure relief are solved, the supercritical state maintenance, gas-liquid separation and melt forming processes are optimized, the volatile component removal efficiency is improved, the phenomenon that melt strips are broken or accumulated is effectively prevented, and continuous and stable operation of the devolatilization process is guaranteed.

The invention discloses a gas storage integrated operation model construction method and system based on digital and intelligent twinning, and relates to the field of gas storage integrated operation model construction, and the method comprises the steps: constructing a single well IPR and VLP curve; a mode of combining forward pressure regulation and reverse pressure regulation is adopted, a pressure value set of all nodes after pressure stabilization is output, and a preliminary pressure steady-state scheme is formed; an economic value evaluation index function is constructed, and the total daily operation cost of the system under the given gas production rate is evaluated; a comprehensive optimization model based on a neural network is constructed, and injection-production quantity reference values of all wells and target values of all nodes are output; and verifying the stability of the comprehensive optimization model based on the neural network according to the output injection-production quantity reference values of all wells and the target values of all the nodes. The method has the advantages that the physical law of gas storage injection and production, the system pressure balance and the economical efficiency target are deeply fused, and a fast and reliable closed loop from pressure steady-state optimization to an economical optimal decision is achieved.

A surrounding rock deformation and failure test system with a rotatable stress main shaft in a three-dimensional crustal stress field is characterized in that a press machine upper pressure head and a press machine base are oppositely distributed up and down, and a loading hydraulic cylinder is connected with the press machine upper pressure head; the surrounding rock sample is vertically arranged in the axial loading space, and a simulation roadway is formed in the axis part of the surrounding rock sample; annular upper and lower end plates are fixedly connected in the upper and lower ends of the confining pressure cylinder respectively; the confining pressure cylinder sleeves the outer side of the axial loading space; a plurality of groups of mounting holes are uniformly formed in the circumferential directions of the annular upper and lower end plates; the radial pressurizing assembly comprises a supporting steel pipe and an elastic capsule. The main supporting section is sleeved with the elastic capsule, and a plurality of through holes are formed in the main supporting section. A plurality of strain bricks are pre-buried in the surrounding rock sample; the track is fixedly mounted in the simulated roadway; the micro camera is assembled on the track through the electric control trolley; and the strain gauge II and the acoustic emission probe are arranged in the simulated roadway. According to the system, the working condition that the direction of a stress field changes can be simulated in a three-dimensional true triaxial stress environment.

The invention discloses a cooling system pressure regulation and control method and device based on multi-source data fusion, and the method comprises the steps: collecting multi-source data from a cooling system through a sensor, carrying out the fusion processing, and generating a standardized sensor data set. And calculating a comprehensive system pressure value by adopting a data fusion technology according to the standardized sensor data set to obtain a fused pressure data set. And determining a system pressure state through threshold comparison based on the fused pressure data set. And obtaining channel flow data based on the system pressure state, and adjusting the opening degree of a valve to obtain an optimized regulation and control result. And transmitting the optimized regulation and control result to a pressure maintaining system, controlling the valve flow by adopting a pressure stabilization regulation algorithm, and determining a pressure balance index. Therefore, according to the cooling system pressure regulation and control method based on multi-source data fusion, the pressure change can be dynamically responded, the system pressure can be stably maintained, and the air resistance phenomenon can be effectively eradicated.

The invention provides an extra-high pressure safety valve off-line detection method and system, and belongs to the technical field of off-line detection, and the method comprises the steps: detection preparation, starting pressure detection, pressure maintaining performance detection and safety control, and in the detection process, if the system pressure exceeds an overpressure protection value, pressurization is automatically stopped, and an alarm is triggered. Through precise detection process, multi-dimensional safety guarantee and full-process data management and control, deep detection and reliable evaluation of the safety valve performance are realized, a defense line is built for safe operation of extra-high voltage equipment, and the system has significant practical value and technical advantages.

The invention relates to the technical field of cone valve multi-mode air supply-energy dissipation cooperative cavitation reduction devices and control methods, and discloses a fluid control device named'cone valve multi-mode air supply-energy dissipation cooperative cavitation reduction devices and control methods'. The conical valve aims to solve the problems that an existing conical valve is serious in cavitation under the working condition of high pressure difference, air supply and energy dissipation functions are separated, and response lags. The device is characterized by comprising three stages of energy dissipation perforated pipes which are arranged at the outlet end of a valve body in a gradient mode, negative pressure injection air supply pipes which are symmetrically arranged outside a flow guide cover and flow guide fins which are welded to the inner wall of a cone, and the three stages of energy dissipation perforated pipes, the negative pressure injection air supply pipes and the flow guide fins cooperate to achieve pressure gradient pressure relief, self-adaptive air supply and flow state stability; the control method dynamically adjusts the air supply intensity based on the opening degree, the pressure difference and the vibration signal. According to the technical scheme, cavitation inception and collapse impact are remarkably restrained, vibration noise is reduced, the service life of the valve is prolonged, an external air source is not needed, the system pressure drop is controllable, and the system is suitable for ultrahigh pressure difference and large-flow hydroelectric working conditions.

The invention discloses a regulation and control method and device for a vehicle cooling system, and the method comprises the steps: collecting a temperature signal and a flow speed signal of cooling liquid in real time, obtaining an engine rotating speed signal and a load signal, carrying out the fusion processing, and generating a real-time working condition parameter of the system. And on the basis of the real-time working condition parameters of the system, a pre-calibrated degassing flow control mapping table is inquired, target degassing flow is obtained through calculation, and an adjustment value of the opening degree of the degassing channel is determined accordingly. Generating a control instruction to drive an actuator to adjust the opening degree of the degassing channel according to the adjustment value of the opening degree of the degassing channel in combination with an environment temperature signal; and meanwhile, an adjusted cooling liquid temperature feedback signal is collected, and the actual heat state parameter of the system is calculated based on the difference value between the cooling liquid temperature feedback signal and the target temperature. Therefore, the system has the advantages of dynamically responding to the working condition change of the engine, optimizing the flow distribution of the cooling liquid and maintaining the pressure balance of the system, and can effectively improve the heat management efficiency and the system reliability.

Herein are described methods and systems for characterizing noise and noise level in pressure measurements in a downhole pressure testing operation in formation testing while drilling. The pressure measurements are acquired using a formation testing tool disposed on a drill string. The methods include drilling a borehole, extending the one or more probes into an inner surface of the borehole, performing a pressure testing operation with a first mud pump rate, wherein the pressure testing operation comprises a drawdown period and a build up period, decreasing the first mud pump rate to a second mud pump rate while measuring pressure during the build up period, decreasing the second mud pump rate to a third mud pump rate while measuring pressure during the build up period, and calculating a noise associated with pore pressure measurements during the first pressure testing operation.

The utility model relates to the technical field of pneumatic control systems, in particular to a single-action pneumatic PST system, which comprises a pneumatic actuating mechanism, a cam valve and an explosion-proof junction box, a valve position transponder is arranged at the front end of the pneumatic actuating mechanism, one end of the cam valve is communicated with a filtering pressure reducing valve, one end of the filtering pressure reducing valve is communicated with a safety valve, and the other end of the filtering pressure reducing valve is communicated with an explosion-proof junction box. And one end of the explosion-proof junction box is connected with a first electromagnetic valve and a second electromagnetic valve respectively. According to the improved single-action pneumatic PST system, the first electromagnetic valve, the hand-operated direction valve and the second electromagnetic valve are adopted, and when the single-action pneumatic PST system is used, flexible control can be conducted when the single-action pneumatic PST system faces complex working conditions and different operation requirements; the explosion-proof junction box and the energy accumulator are adopted, when the single-action pneumatic PST system is used, the electrical safety of the system in a dangerous environment can be guaranteed, meanwhile, the pressure of the system can be kept within a relatively stable range, and the stability of the system during use is improved.

The invention relates to the technical field of piezoelectric liquid pumps, in particular to a piezoelectric liquid pump and a cooling device. The compression chamber and the constant-pressure chamber are arranged in a communicating mode, the piezoelectric assembly can drive the volume change of the compression chamber, a first one-way valve assembly is arranged at the communicating position of the compression chamber and the constant-pressure chamber, and the first one-way valve assembly limits fluid to flow to the constant-pressure chamber in a one-way mode; the medium inlet is communicated with the compression chamber and the outside and provided with a second one-way valve assembly, and the second one-way valve assembly limits fluid to flow to the compression chamber in one direction; and the at least two medium outlets are communicated with the constant-pressure cavity and the outside. The constant-pressure chamber is arranged between the medium outlets and the compression chamber, the first one-way valve assembly is arranged at the communicating position of the constant-pressure chamber and the compression chamber, the constant-pressure chamber can be used for buffering system pressure fluctuation and stabilizing system pressure, and synchronism and consistency of multiple strands of medium fluid output from different medium outlets are improved.

The invention discloses a drilling device for hydraulic ring geological exploration, and particularly relates to the technical field of geological exploration, the drilling device comprises a driving assembly, the driving assembly is provided with a direction adjusting assembly used for adjusting the angle, the direction adjusting assembly is provided with a drilling assembly used for drilling work, and the driving assembly is provided with a feeding adjusting assembly. According to the drilling device for hydraulic ring geological exploration, power is provided for the hydraulic telescopic rod through the hydraulic oil pumping assembly, stable axial feeding of the drilling assembly is achieved, the drilling depth is accurately controlled, the pressure relief assembly monitors the pressure of a hydraulic system in real time, and when the pressure exceeds a set threshold value, the hydraulic telescopic rod is driven to rotate; the electromagnetic ring drives the movable pipe to slide to expose the pressure relief hole, pressure relief is achieved through backflow of hydraulic oil, the situation that the device is damaged due to too large pressure caused by hard rock strata and the like is avoided, the elastic piece pushes the movable pipe to reset to close the pressure relief hole after the pressure is recovered, stable and balanced feeding pressure is guaranteed, self-adaptive pressure adjustment is achieved, and operation safety and reliability are improved.

The invention provides a bearing load real-time monitoring and hydraulic pressure self-adaptive adjusting system and method, and the system comprises a signal sensing unit which is used for collecting a bearing vibration signal, a hydraulic system pressure signal and a main shaft rotating speed signal; and the signal processing and calculating unit is connected with the signal sensing unit and is used for processing the collected signals, estimating the bearing load based on a pre-trained soft measurement model and generating a hydraulic control instruction. The dependence of traditional bearing load monitoring on an expensive force sensor is broken through, and by integrating operation signals such as vibration, hydraulic pressure and rotating speed which are easy to obtain, the bearing load monitoring precision is improved. According to the method, the incidence relation between signals and loads is established through off-line modeling, non-intrusive load real-time estimation is achieved, meanwhile, feed-forward and feedback composite control is adopted, hydraulic pressure is adjusted in a self-adaptive mode according to the estimated loads, traditional empirical fixed setting is replaced, monitoring, adjusting, early warning and maintenance prompting functions are integrated, and real-time monitoring is achieved. The technical problems that a traditional scheme is high in cost, blind in adjustment and dispersed in function are effectively solved.

The invention relates to the field of valve control, in particular to a vacuum system pressure stabilization control method based on valve control. The vacuum system comprises a cavity and a vacuum pump communicating with the cavity through a valve, and the method comprises the steps that S1, based on cavity sampling pressure and target pressure, the target valve opening weight of the next period is calculated through incremental PID; s2, according to the relation between the pre-calibrated valve opening and the valve opening weight, the target valve opening corresponding to the target valve opening weight is obtained; and S3, adjusting the valve to the target valve opening, and returning to the step S1 until the current pressure of the cavity is adjusted to the target pressure. The chamber pressure control precision of the vacuum system can be improved.

The invention relates to the technical field of hydrogen energy preparation and process control, and discloses a fuzzy PID (Proportion Integration Differentiation)-based pressure control method for an alkaline electrolytic water hydrogen production system, which comprises the following steps of: firstly, acquiring current, pressure and separator liquid level data of the system in real time, and calculating a source-load gradient synergistic factor for representing the hysteresis degree of source end disturbance and load end response according to the current, pressure and separator liquid level data; and then pump valve heterogeneous cooperative control is executed, the rotating speed of a circulating pump is actively adjusted through the factor so as to change the flow speed of electrolyte, and feed-forward regulation and control of the gas holdup are achieved. Meanwhile, a gas phase rigidity coefficient is solved according to liquid level changes, a virtual damping domain is constructed, and PID integral and differential parameters are corrected in a self-adaptive mode; and finally, asymmetric variable universe fuzzy reasoning is executed, a hydrogen side universe is compressed through a source load gradient, an oxygen side driven dead zone threshold value is dynamically set, and a double-side valve instruction is output. According to the method, the problems of pressure lag and rigidity time varying under wide power fluctuation are effectively solved through flow velocity auxiliary adjustment and rigidity self-adaption strategies, and efficient and stable operation of the system is achieved.

The invention provides a supercritical carbon dioxide power generation working medium pressure adjusting system, belongs to the technical field of power generation system working medium pressure adjusting, and can at least partially solve the problems that in the existing unit start-stop and load adjusting process, the system pressure is greatly changed, normal operation of a unit is affected, and the working efficiency is low. The system comprises a power generation module, and the power generation module comprises a compressor and a heat regenerator connected with the compressor through a pipeline; the carbon dioxide working medium circulating system is provided with the gas storage tank, part of the carbon dioxide working medium is stored in the gas storage tank through the differential pressure of the high-pressure part and the low-pressure part of the circulating system, the working quality of the circulating system is adjusted, and the carbon dioxide working medium circulating system has the advantages of being simple and convenient to operate.

The invention relates to the technical field of new energy automobile braking control, and discloses an electro-hydraulic hybrid electric vehicle braking force coordination control method based on the braking demand change rate, and the method comprises the steps: collecting the opening degree of a brake pedal in real time, and calculating the braking demand torque and the change rate thereof; based on the battery SOC, the braking demand change rate and the vehicle speed, the braking force distribution allowable proportion and the braking torque of the motor / battery power system are determined through a nonlinear mapping module; collecting the pressure state of the hydraulic system and determining the braking torque of the hydraulic system; on the premise that the total braking demand torque is met, the braking torque of a motor / battery power system, a hydraulic system and a mechanical system is distributed in a layered and coordinated mode. The braking intention emergency degree can be dynamically recognized, the braking safety, the response speed and the energy recovery efficiency are considered, and the stability, smoothness and engineering applicability of a braking system are improved.

The utility model relates to the technical field of casting, in particular to a vacuum negative pressure device for lost foam casting. According to the technical scheme, the device comprises a mounting bottom plate, a vacuum pump is arranged above the mounting bottom plate, a pressure stabilizing assembly is arranged at the position, located on the mounting bottom plate, of the air inlet end of the vacuum pump, a filtering assembly is arranged on one side of the pressure stabilizing assembly, a negative pressure pipe is arranged on a connecting pipe, and a vacuum distribution mechanism is arranged at the end, away from the connecting pipe, of the negative pressure pipe. The filtering assembly adopts a multi-layer composite filtering structure, so that impurities in gas can be efficiently removed, meanwhile, the system pressure can be monitored and adjusted in real time through an intelligent central controller in the pressure stabilizing assembly, pressure fluctuation is effectively buffered, a stable negative pressure environment is provided for lost foam casting, and the production efficiency is improved. And meanwhile, the vacuum distribution mechanism is designed in a modularized mode, negative pressure distribution can be accurately controlled according to different production requirements, the air exhaust efficiency is improved, and the production efficiency of lost foam casting and the precision of castings can be improved.

The invention discloses a pressure self-adaptive regulation and control method for an oil pressure driving honing head, and relates to the technical field of honing head pressure control evaluation, and the method comprises the steps: integrating multi-source sensor data, including honing head vibration amplitude, oil pressure system pressure fluctuation frequency and main shaft motor load current, and comprehensively calculating a honing state index; therefore, the processing state is accurately evaluated. The method has the technical effects that early-stage signs of abnormal machining can be automatically identified, for example, safety, early warning and abnormal states are distinguished through threshold interval division of honing state indexes, and corresponding pressure adjustment strategies are executed. The current pressure is maintained in the safe state, proportional regulation and control are carried out in the early warning state to slightly correct the pressure, and great adjustment or emergency shutdown measures are taken in the abnormal state, so that machining quality reduction or equipment damage caused by pressure inadaptation is effectively avoided. According to the method, continuous self-adaptive regulation and control in the machining process are achieved, the manual intervention requirement is reduced, the honing precision, the equipment reliability and the production efficiency are improved, meanwhile, the fault risk is reduced through the early warning and shutdown functions, and the method is suitable for high-requirement precision machining scenes. And monitoring and adjustment are executed circularly, so that the stability and consistency of the whole machining process are ensured.

The invention discloses a forward and reverse circulation air down-the-hole hammer drilling process which comprises the following steps: a forward circulation down-the-hole hammer construction step: drilling by using a forward circulation down-the-hole hammer, wherein the average time efficiency is 9 meters per hour with the shallow average time efficiency of 100 meters, the displacement of an air compressor in the process is 70 m < 3 >, and the system pressure is 2 MPa; the aging is quickly reduced along with the increase of the well depth, and the displacement of the required compressed air and the system pressure are gradually increased; the method further comprises a reverse circulation down-the-hole hammer construction step, a positive circulation down-the-hole hammer is used for drilling, the average shallow time efficiency of 200 meters is 8.5 meters per hour, the displacement of an air compressor in the process is 70 m < 3 > per hour, and the system pressure is 2 MPa; and after meeting underground water, the time efficiency is suddenly reduced, and the discharge capacity of compressed air and the system pressure are rapidly increased. According to the invention, the successful application of the air drilling well with the diameter of more than phi 400mm in thick limestone, especially in underground water-rich stratums, before this, in the domestic air drilling practice, the drilling depth of the caliber in the similar stratums is not more than 100m.

The invention relates to a method for controlling a hydraulic system (1) for a motor vehicle with an electrically operated pump (2) that regulates the system pressure, wherein the system pressure is controlled between a maximum pressure and an opening pressure to actuate a clutch (17) by means of a slave cylinder (6). To prevent damage to the hydraulic system (1) due to excessive system pressure, pressure values ​​of a pressure signal of the system pressure are statistically evaluated after exceeding the maximum pressure over a predetermined measurement interval, and an error is output if a predetermined probability of the pressure values ​​exceeding the maximum pressure is reached.

The application provides a detachable liquid level type heat load test system suitable for various temperature zones, which comprises an outer Dewar, an inner Dewar, a to-be-tested support, a liquid inlet pipe, an exhaust pipe, a vacuum suction port, a temperature sensor and a liquid level meter, the inner Dewar is arranged in a vacuum environment of the outer Dewar, one end of the to-be-tested support is connected with the outer Dewar, and the other end is connected with the inner Dewar, the liquid inlet pipe is used for conveying liquid refrigerant medium into the inner Dewar through the liquid inlet pipe, the exhaust pipe is used for conveying gas generated by evaporation of the liquid refrigerant medium in the inner Dewar to the outside of the outer Dewar, and the liquid level meter is used for monitoring the liquid storage amount of the liquid refrigerant medium in the inner Dewar. The technical scheme of the application is used to solve the technical problems that the heat load test system in the prior art is limited by the system weight, the system pressure and the system liquid level, which leads to low measurement accuracy, and the system is complex, high in cost, difficult to operate, and poor in applicability to test temperature zones and to-be-tested support shapes and sizes.

The invention discloses a Tesla valve type micro-channel heat sink optimization design method and system, and belongs to the technical field of micro-channel heat dissipation. Non-uniform changes of the top width of the valve element and the height of the valve element in the flowing direction are introduced to serve as optimization design variables, Nusselt number maximization and system pressure drop minimization serve as optimization targets, optimization solving is conducted on the optimization design variables through a multi-target optimization algorithm, and a Pareto optimal solution set is obtained; and a scheme with the maximum relative closeness is selected from the Pareto optimal solution set through an ideal solution approximation sorting method to serve as a comprehensive optimal design scheme. According to the method, a performance prediction agent model is constructed in a Latin hypercube sampling and numerical simulation mode, rapid mapping between structure parameters and heat exchange performance is achieved, the calculation cost in the optimization process is remarkably reduced, the design efficiency is improved, finally, the heat exchange capacity is guaranteed, meanwhile, the flow resistance is effectively controlled, and the heat exchange efficiency is improved. And the comprehensive heat dissipation performance is further improved.

The invention relates to the technical field of heat recovery, in particular to a heat energy recovery management method, device, equipment and medium for a compression heat regeneration drying machine. The method comprises the steps that when high-temperature and high-humidity compressed air generated by an air compressor passes through a switching valve, an air guiding instruction is triggered; high-temperature and high-humidity compressed air is respectively guided to a first drying tower in an adsorption mode and a second drying tower in a regeneration mode; in the regeneration process of the second drying tower, preheating desorption is conducted on the drying agent in the second drying tower through high-temperature compressed air flowing through the first drying tower, and high-temperature regenerated gas is generated; the high-temperature regenerated gas is introduced into a regeneration cooler and exchanges heat with a cooling medium, so that the high-temperature regenerated gas is cooled and condensed, and liquid water is separated out; and the cooling medium after heat recovery is conveyed to a heat utilization unit, heat energy recycling is achieved, and operation parameters of the air compressor and the drying tower are coordinated in real time so as to maintain system pressure balance. The effect of improving the heat recovery efficiency during compression heat regeneration is achieved.

The invention relates to the technical field of semiconductor precision machining, in particular to a precision temperature control system with a high-precision pressure stabilizing function, which comprises a circulating fluid system, the circulating fluid system comprises a liquid inlet pipeline connected with heat exchanger circulating fluid, a water tank is mounted at the tail end of a liquid outlet pipeline of a heat exchanger, and a water pump is arranged at the top of the water tank. The output end of the water pump is connected with a liquid outlet pipeline, and a third filter, a surge tank and a fourth pressure sensor are sequentially arranged on the liquid outlet pipeline in the fluid conveying direction. The pressure stabilizing tank is additionally arranged between the third filter and the fourth pressure sensor, the pressure stabilizing tank can effectively absorb pressure loss caused by the fact that fluid passes through the third filter, the system pressure fluctuation range is reduced to + / -20 mbar from original + / -30 mbar to + / -50 mbar, the pressure stability and control precision of system operation are remarkably improved, and the system pressure fluctuation range is reduced to + / -20 mbar from original + / -30 mbar to + / -50 mbar. The operation pressure of the circulating liquid outlet of the Chiller equipment is stabilized, and the pressure difference fluctuation of the circulating liquid is obviously reduced.

The present application belongs to the field of mechanics, and particularly relates to a method for eliminating error of a quasi-static compression mechanics experiment system. By using a constant pressure or a constant loading speed of a pressure head on a testing machine to perform quasi-static uniaxial compression on a test piece at room temperature, and taking two test pieces of different heights, the relationship between the system stiffness, the force and deformation of the system pressure head can be obtained, so as to obtain two corresponding force-time curves and displacement-time curves. By combining the two equations and eliminating the unknown Young's modulus E, the stiffness coefficient of the test system can be obtained, and the displacement-time curve of the pressure head can be obtained. Subsequently, the Young's modulus E can be inversely solved. The present application corrects the error of the mechanics experiment by defining the system stiffness coefficient, so as to realize a higher precision of the Young's modulus E and improve the accuracy of the quasi-static mechanics experiment.

The utility model discloses a quick exhaust valve which comprises a valve body, the top of the valve body is communicated with an installation pipe, an air outlet is formed in the side wall of the valve body, and an installation opening is formed in the bottom of the valve body. The supporting sleeve is installed in the installation opening, and the top of the supporting sleeve is provided with an extending part in a communicating mode; when the pressure at the initial stage of air inlet is low, the spring stretches to enable the sealing seat to be tightly attached to the extending part, air is prevented from being discharged from the air outlet, it is guaranteed that the air is accumulated in the valve, leakage is prevented, and when the pressure in the valve reaches a certain degree, the thrust of the air is larger than the elastic force of the spring, the sealing seat moves upwards to be separated from the extending part, the air can be rapidly discharged from the air outlet; the position of the threaded sleeve in the mounting pipe is adjusted by rotating the threaded sleeve, and the pretightening force of the spring is changed, so that the opening pressure of the exhaust valve is flexibly adjusted according to different working conditions and system pressure requirements.

The invention discloses a method for releasing liquid carbon dioxide in the technical field of high-pressure pipeline safety release, which is used for a refrigerating system and comprises the following steps of: reducing the flow rate of carbon dioxide entering a well and releasing the carbon dioxide in the well based on the liquid level of a gas-liquid separation tank and the inlet pressure of a throttling and pressure reducing device; the compression power is reduced along with the reduction of the pressure of the air return port of the combined cooling and heating device; after the device is shut down, the carbon dioxide release rate of the lifting well is reduced, and gas return is stopped; when the pressure of the carbon dioxide outlet of the heat exchanger is reduced to a threshold value, discharging is stopped; when the system pressure is balanced, the carbon dioxide in the well is released. The flow of carbon dioxide entering the well is reduced based on the liquid level of the gas-liquid separation tank and the pressure of the throttling and pressure reducing device, well rising carbon dioxide is released, the compression power of the combined cooling and heating device is coupled with the pressure of an air return port, then releasing is stopped, global releasing is conducted after the system pressure is balanced, and the risks of dry freezing, freezing and valve freezing are eliminated; and the discharge safety and the system stability are improved.

The invention discloses a pressure control method and system for a marine ammonia fuel supply system based on model-free self-adaptive control, and the method employs a model-free self-adaptive control scheme based on tight format dynamic linearization, and carries out the real-time collection of system pressure and valve control quantity data. And dynamically estimating a pseudo partial derivative phi (k) on line to capture system characteristics, and designing an adaptive control law to calculate a valve opening instruction according to the system characteristics. A dual-robust mechanism is formed by introducing an estimation weight factor mu and a control weight factor lambda, and noise interference and controlled quantity mutation are effectively suppressed. The method can automatically adapt to system dynamic change and external disturbance, high-precision and strong-robustness stable control over the ammonia fuel supply pressure is achieved under the complex ship working condition, and the safety and reliability of the ammonia power ship are remarkably improved.

The present application relates to the field of new energy vehicle thermal management technology, especially to an integrated thermal management module and a vehicle. The integrated thermal management module comprises: a flow channel for conveying coolant is formed inside a flow dividing member; a power assembly is used to provide power for the coolant flowing in the flow channel; a switching assembly is in communication with the flow channel and comprises a first four-way valve and a second four-way valve; a warm air core inlet, a heat exchanger inlet, a heat exchanger outlet, an electric drive system inlet, an electric drive system outlet, a radiator inlet, a radiator outlet, a heater inlet, a heater outlet, a battery water pump inlet and a battery outlet are arranged on the side wall of the flow dividing member and are in communication with the flow channel. The present application has the advantages of simple structure, small size and easy installation, thereby reducing the weight of the whole vehicle, reducing the parts of the whole vehicle, reducing the cost, reducing the pressure loss of the whole vehicle system, improving the thermal efficiency of the thermal management system, making the vehicle energy-saving and comfortable, and improving the cruising range.