68 results about "Viscous resistance" patented technology

The invention discloses a resistance coefficient calculation method and device of a porous medium, the medium and equipment. The method comprises the steps that a three-dimensional geometric model of target equipment is constructed, a simulation area of the porous medium in the three-dimensional geometric model is determined, a simulation experiment is conducted on the target equipment, and an inlet and outlet experiment pressure difference is obtained; constructing an optimization model based on an inlet and outlet experiment pressure difference and an inlet and outlet simulation pressure difference, wherein the inlet and outlet simulation pressure difference is obtained by performing fluid simulation calculation on a three-dimensional geometric model based on a CFD control equation, a continuity equation, a CFD momentum conservation equation, a viscous resistance coefficient and an inertial resistance coefficient of a simulation area; taking the optimization model as a target function in a population algorithm, wherein position variables corresponding to individuals in the population algorithm are a multidirectional viscous resistance coefficient and a multidirectional inertial resistance coefficient; and solving the optimization model based on a population algorithm to obtain an optimal viscous resistance coefficient and an optimal inertial resistance coefficient. The identification accuracy of the inertial resistance coefficient and the viscous resistance coefficient is improved.

The invention relates to the technical field of steel wire rope detection, and discloses an elevator steel wire rope tensile strength detection device and method.The elevator steel wire rope tensile strength detection device comprises a machine base, a detection frame arranged on the machine base, a control case and a lifting assembly arranged on the detection frame; the lifting assembly comprises a lifting seat, and clamping assemblies for clamping and fixing the steel wire rope are arranged on the upper side of the lifting seat and the detection frame. According to the elevator steel wire rope tensile strength detection device, through the cooperation between the protection assembly and the buffer assembly, damping liquid in the buffer part is extruded by the buffer plate and flows through the through holes, the viscous resistance of the damping liquid is used for attenuating the kinetic energy of a moving machine, and the effect of buffering force unloading is achieved; the flow rate of the damping liquid can be further slowed down through the retention hole in the through hole, the buffering and damping effect is enhanced, the counter-acting force generated when the steel wire rope is broken can be effectively attenuated through the arrangement, and the mechanical structure of the detection equipment is protected against damage.

The application discloses a stroke trigger type welding device and method, belongs to the field of high-speed wire welding, and comprises a support, a mounting plate slidably connected to one side of the support, a welding part fixedly connected to one side of the mounting plate, a motor fixedly connected to one side of the support, a restraint groove is formed in the mounting plate, a rotating disc is rotatably connected to one side of the support, a seat body is fixedly connected to one side of the rotating disc, a roller is rotatably connected to one side of the seat body, the roller is located in the restraint groove, a base is also fixedly connected to one side of the mounting plate and extends into the restraint groove, and an output shaft of the motor is connected with the rotating disc; the material scraping seat on the seat body can scrape off the paste on the outer surface of the rotating roller, after scraping, the frictional resistance is restored from nonlinear and sudden viscous resistance to linear and stable sliding or rolling friction, the single-stroke lifting movement of the mounting plate is more stable, and the crawling phenomenon of jamming is avoided.

The crankshaft and the compressor comprise a short shaft, a long shaft and an eccentric part, the eccentric part is arranged between the long shaft and the short shaft, a first oil outlet hole is formed between the eccentric part and the long shaft, and a second oil outlet hole is formed between the eccentric part and the short shaft; a groove is formed in the end, close to the first oil outlet hole, of the circumferential face of the long shaft, and / or a groove is formed in the end, close to the second oil outlet hole, of the circumferential face of the short shaft. According to the arrangement, the lubrication degree of the eccentric part of the crankshaft is improved through the slotting design, and the viscous resistance of an oil film is effectively reduced.

The invention relates to the field of titration experiments, in particular to an air pressure driven anti-blocking viscous aid titration device and method. The pneumatic-driven anti-blocking viscous aid titration device comprises a burette, a sealing cover and the like, and the burette is screwed with a sealing cover through threads. Through inert gas constant-pressure driving, viscous resistance is overcome, pipe wall adhesion is inhibited through gas pressure, the problem of blockage is avoided during continuous titration of an auxiliary agent, and compared with traditional gravity titration, the flow velocity fluctuation rate of the auxiliary agent is greatly reduced, so that the experiment batch difference is effectively reduced, and the experiment efficiency is improved. It is guaranteed that the auxiliaries stably flow out in the state of filling the outflow channel all the time under the condition of any discharging opening, and the problems that under the condition that an existing valve is small in opening, the auxiliaries flowing out by means of gravity cannot flow out in the state of filling the outflow channel, and then part of the auxiliaries adhere to the inner wall of the channel in the outflow process and cannot flow out in time are solved. And the flow rate fluctuation rate of the auxiliary agent is large.

The utility model relates to the technical field of anti-vibration, and discloses a high-damping anti-vibration seat of integrated circuit equipment, which comprises an anti-vibration seat and a base. According to the high-damping anti-vibration seat of the integrated circuit equipment, through the arrangement of the supporting seat, the base, the damping mechanism and the elastic mechanism, when the integrated circuit equipment is vibrated, the acting force borne by the supporting seat can be transmitted to the piston rod, the piston rod is forced to vibrate, and magnetorheological fluid is pushed to flow in the annular cavity; a magnetic field generated by the permanent magnet array enables magnetorheological fluid particles to form a chain-shaped structure, fluid shear stress is greatly increased, nonlinear viscous resistance is generated, meanwhile, vertical reciprocating motion of the piston rod cuts magnetic induction lines of the permanent magnet array, an eddy current effect is triggered, reverse electromagnetic damping force is generated, and the damping effect is improved. Therefore, magnetic circuit cutting and fluid extrusion are achieved while movement of the piston rod is achieved, a composite energy dissipation mechanism of electromagnetic damping and viscous damping is formed, and the energy dissipation efficiency and the resonance peak suppression efficiency are remarkably improved.

This invention belongs to the field of vibration control technology and discloses a viscous damper for controlling vertical vibration. The viscous damper adopts a double-cylinder, unsealed structure. The two cylinders are connected by a connecting rod hole in the middle of the cylinder partition. One end of the connecting rod is rigidly connected to a piston inside the second cylinder, and the other end passes through the cylinder partition and the top plate of the first cylinder before connecting to a structure. The bottom of the second cylinder is connected to another structure. When the two structures generate a vertical relative velocity, the connecting rod drives the piston to move in the damping fluid of the second cylinder, generating viscous resistance and suppressing the relative motion of the two structures. This invention does not require strict sealing, has a simple structure, low manufacturing cost, and better durability. The damping coefficient can be dynamically adjusted as needed by the comb teeth or the gradually changing inner cavity of the cylinder, resulting in higher efficiency compared to traditional dampers. This invention can effectively control the vertical or slightly inclined relative motion between various large structures such as bridges, cables, building internal structures, and marine engineering projects caused by various dynamic loads.

The invention discloses a rapid numerical prediction method for flow resistance of a shellfish trap, and relates to the field of flow resistance analysis of a nuclear power seawater cooling system. A filter screen explicit modeling or experimental testing mode is mostly adopted for flow resistance analysis of an existing shellfish catcher, and the problems that the calculation scale is large, the simulation period is long, the cost is high, or parameters depend on experience, and the engineering applicability is insufficient exist. On the basis of a porous medium equivalent modeling thought, on the premise that the porosity of the filter screen is kept consistent, a filter screen area is replaced with a porous medium area, only the viscous resistance effect in direct proportion to the flow velocity is introduced, and through pressure drop comparison of an explicit filter screen model and a porous medium model, iterative fitting is conducted on viscous resistance parameters, so that the filter screen porosity is calculated. And fitting parameters are applied to the integral model of the shellfish trap, so that rapid numerical calculation of the flow resistance characteristic is realized. The method is suitable for engineering design, operation analysis and flow resistance rapid evaluation of shellfish traps and similar high-porosity filtering structures in a seawater cooling system of a nuclear power station.

The utility model discloses a mine mining crushing device, which relates to the technical field of ore crushing devices and comprises a shell, four mounting holes are formed in the outer surface of the shell, supporting blocks are embedded in the four mounting holes, every two supporting blocks form a group, and the opposite surfaces of the two groups of supporting blocks are rotationally connected with crushing rollers through bearings. According to the utility model, when the instantaneous impact force is too high, the two crushing rollers transmit kinetic energy and extrude the four buffer pieces through the two supporting blocks, the four dampers compress the stroke after being stressed, the amplitude is attenuated, the vibration is inhibited and the buffer is provided through viscous resistance, and meanwhile, the four springs compress the stroke and absorb the kinetic energy, so that the situation that the crushing rollers are damaged during mining and transportation is effectively avoided; and the instant impact force borne by the crushing rollers when the ores are extruded is too high, so that the service life of parts is guaranteed.

The invention discloses a multi-branch pipe flow uniformity optimization method based on valve equivalent resistance model mapping, which comprises the following steps of: 1, replacing a real valve with an equivalent resistance area, performing CFD (Computational Fluid Dynamics) simulation on a single valve and a single pipe, and establishing a mapping table of the opening degree, the viscous resistance of the equivalent resistance area and the inertial resistance; 2, establishing a multi-branch-pipe CFD model, querying a mapping table for the opening degrees of all valves, randomly generating an inertia resistance coefficient and a viscous resistance coefficient, constructing a dual-objective optimization function by taking the virtual opening degree of each branch pipe as a design variable, then calling CFD to solve all the branch pipes, and returning the dual-objective optimization function, so as to obtain a multi-branch-pipe CFD model; the flow unevenness of each branch pipe and the most unfavorable loop resistance in the system are output, multi-objective optimization and global optimization are carried out by adopting an NSGA-II algorithm, and a Pareto leading solution set of an optimal valve opening combination is output for a user; and 3, the flow of the multiple branch pipes is leveled through the optimal valve opening degree combination. The method has the advantages of modeling simplification, high calculation efficiency, short optimization period, strong adaptability and good stability.

The invention discloses a method for determining the resistance coefficient of a porous medium of a permeable building in CFD (computational fluid dynamics) numerical simulation, which comprises the following steps of: measuring upstream and downstream water depths and flow velocities of the permeable building under a given incoming flow condition by adopting a series of physical model tests, and acquiring hydraulic characteristics of the permeable building under different geometric scale conditions; the method comprises the following steps: inverting physical model tests with different scales through CFD numerical simulation, simulating a permeable building by adopting a porous medium in a CFD model, calculating the resistance of the porous medium to water flow by adopting a resistance formula in a Forchheimer form, and obtaining the resistance characteristic of the permeable building; establishing a mathematical relationship between the viscous resistance coefficient and the geometric scale and between the inertial resistance coefficient and the geometric scale, and determining the viscous resistance coefficient and the inertial resistance coefficient under the prototype scale and other unknown scales. According to the method, the accuracy of the resistance coefficient of the porous medium of the permeable building is improved, and the method is suitable for submerged and water outlet type permeable buildings composed of various porous or open structural bodies.

The application provides a large bulk carrier speed power prediction method and system, first, the trial data of a large bulk carrier and a ship model and the resistance data of the ship model measured in the test are obtained, and the main dimension parameter data of the ship model is obtained, then the CFD superposition method is used for calculation to establish a stable calculation strategy, then the StarCCM+ software is used for CFD simulation of the ship model according to the stable calculation strategy, the frictional resistance and the viscous pressure resistance of the ship model are obtained, the second frictional resistance coefficient of the ship model and the frictional resistance coefficient of the ship are calculated respectively by using the frictional resistance formula, and the first shape factor of the ship model is calculated, finally, the viscous resistance coefficient of the ship is calculated according to the frictional resistance coefficient of the ship and the first shape factor, the speed power of the ship is calculated according to the viscous resistance coefficient of the ship, the second frictional resistance coefficient of the ship model and the total resistance coefficient of the ship model in the test data, the prediction speed is effectively improved, the modeling cost is reduced, and the prediction precision is greatly improved.

A rolling bearing (1) has raceway surfaces (11a, 12a) and rolling bodies (13) that roll on the raceway surfaces. In this rolling bearing (1), the raceway surfaces are in point contact with the rolling elements, an oil film is formed at the point contact portion, and the raceway surfaces (11a, 12a) have a contact portion that is in contact with the rolling elements (13) and a non-contact portion that is not in contact with the rolling elements. The calculation range in the long axis direction of the contact ellipse is set to a length selected within a range that exceeds the long axis radius of the contact ellipse and is equal to or less than the axial equivalent radius, and an estimated value (Fr, w) of the rolling viscous resistance is calculated from a regression equation.

The utility model belongs to the technical field of spray covers, and mainly relates to a spray cover and an aerosol can, the spray cover comprises a pressing block movably assembled on a can body, the pressing block is provided with an insertion pipe and a nozzle which are communicated with each other, and the outer side of the insertion pipe is sleeved with a slow release assembly; the slow release assembly comprises a piston and a cavity with a sealed cavity, the piston and the cavity are connected to the outer side of the insertion pipe in a sleeving mode, and the piston is fixedly connected with the pressing block through a sleeve connected to the insertion pipe in a sleeving mode. The cavity is used for being filled with liquid with viscous resistance, the piston divides the cavity into a first cavity and a second cavity which are communicated with each other, and the pressing block is moved to drive the piston to slide in the cavity so that the liquid can flow between the first cavity and the second cavity; the insertion pipe is sleeved with a spring, and the two ends of the spring are connected with the pressing block and the cavity respectively. The reset speed of the pressing block is delayed through the synergistic effect of the viscous resistance of the slow release assembly and the elastic force of the spring, and therefore the valve rod can still be kept in the open state temporarily after pressing is stopped, and continuous release of spray is achieved.

The utility model discloses a midwifery apparatus for assisting delivery in obstetrics, which relates to the technical field of medical instruments and comprises a damping outer cylinder, damping plate components are mounted and connected to two sides of the inside of the damping outer cylinder, and a damping inner cylinder is rotatably connected to the center of the two damping plate components. The two ends of the damping inner cylinder are slidably connected with elastic resistance assemblies. Damping fluid stored in the damping outer cylinder is used as a main resistance source when a puerpera is trained, when the damping fluid passes through the groove holes in the surface of the piston plate with the holes, the viscous resistance of damping passing through the groove holes and changing linearly is used as the main resistance source when the puerpera is trained, the puerpera can be effectively protected, and meanwhile the damping fluid is prevented from being damaged. When the reset springs push the piston plates with the holes to reset, due to the existence of viscous resistance, the distance between the two piston plates with the holes is low, and the problem that in the reset process of the piston plates with the holes, leg muscle groups of a puerpera are strained due to the fact that the reset speed is high is solved.

The invention discloses a building roof drainage optimization method and structure based on a viscous resistance type brachistochrone, and relates to the technical field of constructional engineering and fluid mechanics. The method aims at solving the problem that the efficiency is poor due to the fact that viscous resistance is ignored in actual drainage application of a traditional resistance-free brachistochrone theory. The method comprises the following steps: establishing a mass point viscous resistance model; deducing and solving a brachistochrone parameter equation under the model; and designing a roof drainage path or a tile curved surface shape according to the obtained equation. By introducing the resistance factor, the drainage path better conforms to the real physical environment. Experiments show that compared with a traditional resistance-free brachistochrone design, the design has the advantages that the roof drainage time can be effectively shortened, the optimization rate exceeds 40%, the drainage efficiency is remarkably improved, and the design has important application value in optimization of roof drainage systems for repairing large buildings and ancient buildings.

The present application relates to a kind of to thwart flutter spring safety valve, belong to valve technical field, to solve the wear and tear and system instability problem caused by the quick movement of valve stem when fluttering of existing spring safety valve.The safety valve includes valve body, valve stem, valve cover, valve flap and main spring and other core components, wherein the top of valve cover is additionally provided with bonnet structure, and its inside is divided into upper cap cavity (storage buffer liquid) and lower cap cavity, and is communicated by the upper through hole on the partition plate.The scraper is installed on the top of valve stem, and when fluttering occurs, it moves quickly with valve stem, and cuts off the plastic plug rod in cutting cavity;The plastic plug rod is moved inward by the action of side push spring, so that the side groove is aligned with the upper through hole, and the liquid flows into the lower cap cavity, then enters the cover cavity through the middle through hole on the valve cover, and exerts viscous resistance on the lower spring seat, so as to slow down the movement of valve stem and eliminate fluttering.The present application activates liquid buffer by mechanical cutting, realizes automatic thwarting of fluttering, significantly reduces the risk of valve wear and tear, prolongs the service life, and ensures the safety and stability of system.

The application provides a turbine flowmeter, which comprises a main body, a rotating shaft, a first turbine and a second turbine; an accommodating cavity is formed in the main body; the rotating shaft is located in the accommodating cavity and rotationally connected with the main body; the first turbine and the second turbine are arranged on the rotating shaft respectively, and a preset distance is provided between the first turbine and the second turbine; when fluid flows in the accommodating cavity and sequentially flows through the first turbine and the second turbine, the rotating direction of the first turbine and the rotating direction of the second turbine are the same. The application has the technical effect that the design is reasonable, the viscous resistance loss of the fluid is effectively reduced, and the measurement accuracy is improved.

The application discloses a bionic layout optimization method for a double-torpedo underwater vehicle group, and the method comprises the following steps: dividing the underwater vehicle according to the fluid flow direction, and constructing a partition linear equation; setting a ring-shaped pit structure on the head surface of the underwater vehicle, and connecting the underwater vehicles in series to form a double-torpedo underwater vehicle group; performing simulation analysis on the underwater vehicle group, and calculating the drag reduction rate of the underwater vehicle group; and determining the underwater vehicle spacing and the bionic shark rib ring-shaped pit structure parameters according to the drag reduction rate, the underwater vehicle spacing range and the bionic shark rib ring-shaped pit structure parameter range. The application combines the surface drag reduction and the arrangement layout drag reduction, and the series connection structure reduces the pressure difference resistance of the latter vehicle and the flow rate of the fluid flowing through the head of the latter vehicle, and compared with the high flow rate state, the ring-shaped pit structure on the head has a stronger secondary vortex and rolling bearing effect on the low-speed flow passing through the tail, thereby further reducing the viscous resistance and realizing the superposition of the drag reduction effect.

The present application relates to the technical field of marine equipment modeling simulation, and provides an anchor chain parameterized modeling method and system based on multi-body-fluid joint simulation, which comprises: equivalent actual anchor chain to a plurality of anchor chain balls; by means of constant speed towing hydrodynamic simulation, the viscous resistance of the actual anchor chain section is calculated; the same equivalent anchor chain section is simulated under the same towing working condition, and the viscous resistance of the equivalent anchor chain section is calculated; the anchor chain ball radius is corrected through consistency verification; the density of the anchor chain ball is calculated based on the number and radius of the anchor chain ball; the anchoring water depth, mooring radius and seabed lying anchor chain section length of the actual anchor chain are obtained, and the initial position of each anchor chain ball is determined in combination with the anchor chain ball spacing; the model of the seabed and its irregular structures is created, and multi-body-fluid dynamics joint simulation under the action of gravity is carried out in combination with the radius, density and initial position of each anchor chain ball. The problems of low parameterization degree and poor adaptability of the mooring anchor chain lumped mass modeling method are solved.

The bearing damper comprises an upper connecting plate and a lower connecting plate located below the upper connecting plate, the upper portion of the lower connecting plate is fixedly connected with a shell containing damping liquid, the lower portion of the upper connecting plate is fixedly connected with a plunger extending into the damping liquid, and a sealing body is connected between the upper portion of the shell and the upper portion of the plunger. End covers penetrate through the periphery of the shell and are in sliding connection with guiding bodies, the guiding bodies are rotationally connected to adjusting screw rods in threaded connection with the end covers through bearings, and elastic bodies are fixedly arranged at the ends, close to the plungers, of the guiding bodies. The plunger can be reversely biased towards the thermal displacement of the pipeline through the elastic body, the situation that the plunger abuts against the inner wall of the shell due to the fact that the displacement of the pipeline is too large is avoided, secondary stress of the pipeline is prevented, safe operation of the pipeline is guaranteed, vibration of the pipeline can be gradually reduced under the condition that damping liquid continuously generates viscous resistance on the plunger, and the service life of the pipeline is prolonged. And the damping effect of the damper on the pipeline is ensured.

The application discloses a honeycomb fracture simulation device and a device for simulating proppant migration, comprising a plurality of multi-wall barrier assemblies and a fixing assembly, each of the barrier assemblies is installed on the fixing assembly, each of the barrier assemblies comprises a plurality of interconnected barrier components, each of the barrier components has a certain included angle to form a regular polygon structure, one of the barrier components in any barrier assembly is another barrier component in another multi-wall barrier assembly to form a honeycomb structure, each of the barrier components is provided with a through hole penetrating through the barrier component to allow the proppant to pass, the proppant migrates in the fracture under the action of gravity, buoyancy, liquid carrying force, viscous resistance and the like, and the proppant passes through the through hole from one barrier component to another barrier component, the device highly simulates the state of the proppant migration in the real honeycomb fracture, and is convenient for workers to make a fracturing scheme.

The invention discloses a rotary connecting structure of a horizontal health cabin, and relates to the technical field of horizontal health cabins, the rotary connecting structure comprises a health cabin body and a cabin door, the upper part of the health cabin body is fixedly provided with a first connecting unit, and the upper part of the cabin door is fixedly provided with a second connecting unit; damping units are arranged in the first connecting unit and the second connecting unit, a control unit is further arranged on the upper portion of the health cabin body, and mounting units are arranged at the front end and the rear end of the bottom of each damping unit. Dynamic damping adjustment is achieved through the synergistic effect of the control unit and the damping unit, and when a user operates the cabin door to be opened or closed, damping oil in the damping oil storage tank can be driven by the micro control pump to be conveyed to the communicating pipe through the conveying hose and accurately guided into the first inner pipe and the second inner pipe through the communicating pipe, so that the damping effect is achieved. The gap between the first sleeve and the second sleeve is fully filled with damping oil from the oil outlet, the viscous resistance is enhanced, and self-adaptive adjustment of rotation damping of the cabin door is achieved.

The invention relates to the technical field of solder paste viscosity testing, and discloses a stored solder paste viscosity tester based on solder paste production and a testing method.The stored solder paste viscosity tester based on solder paste production comprises an equipment table, a constant-temperature assembly and a lifting assembly, and the constant-temperature assembly and the lifting assembly are fixedly installed above the equipment table; a control mechanism and a stirring mechanism are arranged above the constant-temperature assembly, through the arranged testing assembly, the control mechanism drives the rigid rotating shaft to rotate, certain shearing force is applied to the solder paste, the viscous resistance of the solder paste is measured and converted into a viscosity value, and therefore the viscosity range of the solder paste is obtained; then the rigid rotating shaft is driven by the control mechanism to move upwards, the flexible rotating shaft is exposed, in the upward moving process of the rigid rotating shaft, the flexible brush can pass through the carding groove in the inner wall of the rigid rotating shaft, the flexible brush can be carded and unfolded through the carding groove, the brush is made to make uniform contact with solder paste to be tested, and the actual use scene is simulated more accurately.

This invention provides a scroll compressor having a cross-slip ring (17) that prevents the rotation of a rotating scroll member. The cross-slip ring (17) has an upper annular connecting passage (17d) on the axial upper surface of the annular portion (17a) that connects the inner and outer circumferences of the annular portion (17a). As a result, the contact area between the cross-slip ring (17), the bearing component in contact with the cross-slip ring (17), or the rotating scroll member is reduced, thereby reducing sliding losses. Furthermore, since the flowability of the refrigeration oil present around the cross-slip ring (17) is improved, reducing viscous resistance, a high-efficiency scroll compressor can be achieved.

The invention relates to the technical field of foam seepage, in particular to a foam seepage state analysis method based on a pore throat structure in a pore network, which comprises the following steps: establishing a pore network model; simulating a foam migration mechanism under a pore size, and calculating a pressure threshold value required by flowing foam by utilizing a pressure threshold value of viscous resistance of a foam liquid film; foam seepage is simulated in a pore network, and a foam displacement process is carried out by improving a memory invasion percolation method and combining a displacement mechanism and a foam coalescence mechanism. According to the method, the problem that the foam rheological characteristics and the seepage state cannot be accurately and efficiently deduced based on a memory intrusion percolation algorithm is solved.

The application provides a method and device for calculating the performance of a sand control device, the method comprising: step 1: obtaining pressure measurement data ΔP1 at different speeds V through a vortex tube panel model test; step 2: obtaining coefficients a and b according to the V and ΔP1 by using a formula; step 3: calculating viscous drag coefficients and inertial drag coefficients C by using a formula and a corresponding relationship about V; step 4: inputting the viscous drag coefficients and the inertial drag coefficients C into a calculation model of the vortex tube panel and performing simulation to obtain pressure simulation data ΔP2, and fine-tuning the viscous drag coefficients and the inertial drag coefficients C according to the pressure simulation data ΔP2 so that the pressure measurement data ΔP in the calculation model is close to the actual pressure loss of the vortex tube panel; and step 5: inputting the viscous drag coefficients and the inertial drag coefficients C into a calculation model of the sand control device to perform simulation calculation and obtain performance data of the sand control device.

This application relates to a testing method, apparatus, and evaluation method for the drag coefficient of a dry koji pile. The testing method includes: setting up a first test model and a second test model; obtaining the mapping relationship between the pressure and flow rate of the gas inside the first and second test models; obtaining the inertial drag coefficient and viscous drag coefficient of the first and second test models respectively based on the mapping relationship; dividing the dry koji pile to be tested into a spatial grid and sampling each grid; obtaining the inertial drag coefficient and viscous drag coefficient of each grid based on the inertial drag coefficient and viscous drag coefficient of the first and second test models, as well as the distribution of koji blocks and koji powder in each grid. This application can comprehensively test the drag coefficient of the dry koji pile by obtaining the drag coefficient of each grid, resulting in more accurate and reliable test results, and providing sufficient data support for understanding the heat dissipation capacity of the dry koji pile.

The invention provides a rotational inertia measuring method based on comparison of rotational inertia and dynamic coefficients between systems. Under the condition that the total resistance moment borne by the system and the instantaneous rotating speed in the deceleration process meet a quadratic polynomial, motion parameter data, including rotating speed-time or angular position-time or initial rotating speed-stop time data, of the system to be tested and a comparison system containing a rotational inertia standard part are obtained; fitting the data by using a corresponding function model to obtain resistance moment equivalent coefficients of the two systems; and comparing the resistance moment equivalent coefficients of the two systems to obtain the rotational inertia of the to-be-tested system. The method is simplified in measurement process, low in cost, high in applicability and particularly suitable for high-precision measurement of the rotational inertia of a system under the complex conditions of mechanical resistance, fluid viscous resistance, electromagnetic damping force and the like.

The invention relates to the technical field of material and structure testing, in particular to a seat testing method and system combining a high and low temperature environment chamber and a robot, and the method comprises the steps: controlling the robot to execute a non-contact approaching action and a contact testing action, and collecting the joint operation data of the robot; according to joint operation data in a non-contact approaching action stage, a viscous resistance coefficient sequence is determined, and an internal friction power threshold model changing along with accumulated shearing duration is constructed; determining a current internal friction power threshold value according to the internal friction power threshold value model, the current accumulated shearing duration and the current joint rotating speed in the stage that the robot executes the contact test action; determining external contact power according to the joint operation data in the contact test action stage and the current internal friction power threshold; and determining a seat reaction force according to the external contact power, and controlling the robot to test the seat based on the seat reaction force. According to the invention, the seat can be accurately and reliably tested under a harsh temperature condition.