91 results about "Constant load" patented technology

The invention discloses a production method of thick-wall pipeline steel X65MS for polar regions, which adopts ultra-low carbon and high Ni + casting blank secondary cogging extreme cooling + steel plate online ultrafast cooling, breaks the component design of the conventional pipeline steel standard, solves the problem of poor drop hammer low-temperature toughness of thick-wall acid-resistant pipeline steel at-55 DEG C, and has the transverse and longitudinal yield strength of 460-560MPa, the tensile strength of 590-650MPa, the yield ratio of less than or equal to 0.80, the tensile strength of 590-650MPa and the tensile strength of less than or equal to 0.80. The uniform elongation is 10%-12%, the impact value at-55 DEG C is 400-500 J, and the drop weight at-55 DEG C is 90%-95%; when the product is soaked in an NACE solution for 96 hours in an HIC test, CLR, CTR and CSR are all 0; sSC test: four-point bending constant load nominal yield is 90%, and the sample is soaked for 720 hours, and the surface of the sample has no crack; the CTOD value of the crack tip opening displacement of the CTOD test material at-55 DEG C is greater than or equal to 0.6 mm.

The invention discloses a related quantitative analysis method and system based on steam turbine regulating valve opening disturbance, and belongs to the technical field of generator set optimization operation. Sequentially deducing to obtain a first differential equation and a second differential equation based on the steam temperature change when the steam turbine regulates the valve opening disturbance; the function relation between the enthalpy value of the once-through boiler outlet working medium and the temperature and the pressure is established, and a quantitative analysis equation of the steam turbine adjusting valve opening disturbance to the once-through boiler outlet steam temperature is deduced; based on the proportional relation between the first-stage front steam pressure of the steam turbine and the front steam pressure of the adjusting steam valve and the load constant condition of the once-through boiler, a quantitative analysis equation of the opening disturbance of the adjusting steam valve of the steam turbine to the first-stage front steam pressure of the steam turbine is deduced. Through a reasonable simplified formula, the quantitative influence result of the opening degree change of the steam turbine adjusting valve on the outlet steam temperature of the once-through boiler and the first-stage front steam pressure of the steam turbine can be rapidly and accurately obtained, operation personnel can be assisted in optimizing operation, and then safe and economical operation of a generator set is guaranteed.

A microgrid controller of a microgrid includes a communication interface configured to receive load information corresponding to a current load demand of a plurality of loads connected to the microgrid and output control signals for controlling energy resource systems associated with the microgrid, which include a non-stabilizing group and a stabilizing group; and one or more processors, coupled to the one or more memories, configured to execute a load stabilization algorithm to generate the one or more control signals based on the load information. Executing the load stabilization algorithm includes generating, based on the load information, one or more first control signals to dynamically control an amount of total output power provided by the stabilizing group to a power distribution network of the microgrid in order to stabilize one or more cyclic loads on the power distribution network and to maintain the non-stabilizing group at a substantially constant load.

The invention relates to physical sample preparation equipment and method for an inner wall eccentric wear sleeve, and the physical sample preparation equipment for the inner wall eccentric wear sleeve comprises a rotatable main shaft, and the outer side wall of the main shaft is sleeved with a grinding wheel structure; the sleeve is arranged on the outer side of the main shaft in a sleeving mode, and the axial direction of the sleeve is parallel to the axial direction of the main shaft; the first driving device is connected with the main shaft and can drive the main shaft to rotate; the second driving device is connected with the sleeve, can drive the sleeve to move in the radial direction so as to make contact with the grinding wheel structure, can apply a preset constant load to the sleeve, and can further drive the sleeve to continue to move in the radial direction in the process that the sleeve makes contact with the grinding wheel structure to generate frictional wear; and the sleeve and the grinding wheel structure are kept in a contact state under the action of the preset constant load, so that an eccentric wear groove is formed in the inner wall of the sleeve. According to the invention, the problem of lack of preparation of an eccentric wear sleeve material sample with a crescent-shaped inner wall in the prior art can be solved.

The invention relates to the technical field of ocean information, and discloses a digital test system and method for an underwater power source, and the system comprises an umbilical cable unit which is used for connecting a variable-frequency power supply and a motor; the generator is connected to the output end of the hydraulic system; the control platform is used for acquiring real-time data related to the underwater power source and simulating the overall system performance of the power source system under a constant load working condition and a load sudden change working condition; the method is also used for determining the adjustment mode of the umbilical cable unit in the simulation process. According to the invention, the overall system performance of the underwater power source under the load sudden change working condition can be tested and verified.

The invention provides an ammonia hydrogen energy structure material constant strain rate and constant load stress corrosion synchronous monitoring platform based on acoustic emission and an implementation method thereof. Comprising a gas supply and pressurization system, a constant strain rate and constant load stress corrosion synchronous test system, a gas leakage safety control system, an acoustic emission and digital image correlation (DIC) technology online monitoring analysis system, a temperature control system and a computer integrated analysis system. In-situ dynamic analysis of stress corrosion crack propagation is realized in combination with a DIC technology; the temperature control system realizes accurate temperature control on the corrosion test reaction kettle through an independent temperature control module; the computer integrated analysis system processes multi-source data, and establishes dynamic mapping between acoustic emission characteristic parameters and corrosion crack growth rate. The platform solves the problems of off-line monitoring, single loading mode and the like of a traditional corrosion test, captures a corrosion-induced crack propagation process in real time, improves test efficiency and analysis comprehensiveness, and provides powerful support for research on corrosion behaviors of ammonia hydrogen energy structural materials.

The application provides a cement industry load production optimization scheduling method considering the adjustability of a rotary kiln, and belongs to the technical field of cement industry load production optimization scheduling; in order to solve the defects that the rotary kiln is generally regarded as a constant load and the adjustable potential is ignored in the existing cement industry load, the technical scheme is that: the rotary kiln is modeled by combining mechanism and data, the adjustability is verified, and a mechanism model of the coupling relationship between the rotary kiln temperature and the materials of the front and rear production links is constructed on the basis of energy conservation and mass conservation; then, the model parameters are identified by using the historical operation data of the rotary kiln, and the mechanism interpretability and data accuracy are considered; finally, the whole cement production process is summarized as multiple continuous links by taking a state task network as a framework, each link corresponds to a node, and the cement industry load production optimization scheduling is realized through material balance, start-stop and storage constraints; the application is applied to cement production control.

The invention relates to the technical field of testing, and provides an actuator loading testing device which comprises a hydraulic oil cylinder, a reversing valve, a hydraulic pump, a motor, a first ball valve, a second ball valve, a proportional overflow valve, an electromagnetic overflow valve and a controller. The controller is used for controlling the first ball valve, the second ball valve, the reversing valve, the electromagnetic overflow valve or the proportional overflow valve according to the oil inlet and outlet pressure of the first cavity A and the second cavity B of the hydraulic oil cylinder so as to test the actuator. The device not only can carry out a tension test of the actuator, but also can carry out a thrust test of the actuator, not only can carry out a variable and constant load test of the actuator, but also can keep the load force unchanged when the actuator moves so as to carry out a constant load test of the actuator and cover a full working condition test of the actuator, and the whole device is loaded by a hydraulic system, so that the test efficiency is improved. High load can be obtained by increasing system pressure, and the whole device is safe and reliable.

To provide an adhesive composition which is excellent in 180-degree peel adhesive force, constant load holding power and shear retention force among adhesive characteristics and has high removability and to provide an adhesive tape having an adhesive layer composed of the adhesive composition.SOLUTION: In order to exhibit favorable adhesive properties in an adhesive composition, it is crucial to adjust the dynamic viscoelasticity of the adhesive composition among various physical properties and it was found that the storage modulus G' strongly correlates with shear holding force performance and tanδ strongly correlates with constant load holding power performance. Specifically, it is necessary for the storage modulus G' at a constant temperature to be above a certain value in order to achieve an adhesive layer having excellent shear retention force and it was found that it is necessary for the tanδ at a constant temperature to be equal to or above a certain value in order to achieve an adhesive layer having excellent constant load holding power.SELECTED DRAWING: None

A kind of thick-wall acid-resistant pipeline steel X65MS hot rolling process method, the chemical composition of steel is as follows: C=0.03%~0.04%, Si=0.2%~0.4%, Mn=1.0%~1.2%, Cr=0.2%~0.4%, Cu=0.2%~0.3%, Ni=0.1%~0.4%, Mo=0.10%~0.25%, Nb=0.03%~0.04%, Ti=0.01%~0.015%, Ce=0.004%~0.006%, S≤0.004%, P≤0.008%, the balance is Fe and inevitable impurities;Production is carried out using continuous casting billet with thickness of 360mm and above, and the finished product thickness is 40~55mm;Three-stage rolling process and the matched intermediate billet cooling and post-rolling ultra-fast cooling process are used, the obtained pipeline steel has CLR≤10%, CSR≤1%, CTR≤1% in hydrogen-induced cracking (HIC) experiment under the condition of NACE solution immersion for 96 hours;In sulfide stress corrosion cracking (SSCC) experiment, no crack is found under the condition of four-point bending constant load nominal yield of 90% for 720 hours.

The present application relates to compressor online detection technical field, provide a kind of compressor online detection equipment and compressor online detection method.The compressor online detection equipment includes: stabilized power supply, with the compressor to be measured is connected;Suction stabilized component is connected in the suction pipeline of the compressor to be measured, for adjusting the suction pressure of the compressor to be measured;Exhaust stabilized component is connected in the exhaust pipeline of the compressor to be measured, for adjusting the exhaust pressure of the compressor to be measured, so that the compressor to be measured has exhaust pressure constant load operating phase;And acquisition device, with the compressor to be measured is connected, for acquiring the operating parameter of the compressor to be measured in the load operating phase.The present application can realize the flexible, stable, accurate detection of the operating parameter of the compressor to be measured, meet the test demand of the compressor to be measured.

The present application relates to the technical field of plate performance testing, and particularly relates to a kind of plate edge durability test method;It comprises the following steps: cutting plate sample into standard size test piece;Using thermal mechanical analyzer respectively test the linear expansion coefficient of test piece edge material and base material;The test piece after processing is placed in environmental test chamber and is subjected to cyclic test;Test piece is fixed on load testing device, and constant load is applied along the direction perpendicular to the edge interface of plate plane;Using flatness tester to measure the overall warping of test piece, compare with the warping data before testing, calculate the warping change, evaluate the actual effect of plate balanced laminating process on preventing warping after edge sealing;Using weighted scoring method to calculate the comprehensive score of edge durability;Realize that the long-term durability of plate edge sealing under complex working conditions can be comprehensively and accurately evaluated, and provide scientific and comprehensive technical support for edge sealing process optimization, material selection and structure design.

The utility model relates to a high-speed precise bearing dynamic stiffness measuring device, and belongs to the technical field of bearing dynamic stiffness measurement. A fixing plate of the device comprises a mounting ring and a base, the mounting ring is of an annular structure formed by combining an upper semicircular ring and a lower semicircular ring in a split mode, the lower semicircular ring is located at the top of the base and integrated with the base, and the mounting ring is arranged on a main connecting annular plate in a sleeving mode and clamps and fixes the main connecting annular plate through the mounting ring. The thrust electric cylinder is connected with the main connecting annular plate through a connecting plate; the front end of the thrust electric cylinder extends into an inner cavity of the main connecting annular plate, the spherical floating push head and the force measuring sensor are sequentially assembled at the front end of the thrust electric cylinder, and the bearing push plate is arranged between the floating push head and the test bearing on the rotating mandrel. The device is used for measuring the dynamic stiffness of the high-speed precise bearing, and can realize the measurement of the dynamic stiffness of the bearing in various coupling forms such as variable load, variable speed, constant load, constant speed and the like by controlling the rotating speed of the motor and the thrust of the thrust cylinder.

A microgrid controller of a microgrid includes a communication interface configured to receive load information corresponding to a current load demand of a plurality of loads connected to the microgrid and output control signals for controlling energy resource systems associated with the microgrid, which include a non-stabilizing group and a stabilizing group; and one or more processors, coupled to the one or more memories, configured to execute a load stabilization algorithm to generate the one or more control signals based on the load information. Executing the load stabilization algorithm includes generating, based on the load information, one or more first control signals to dynamically control an amount of total output power provided by the stabilizing group to a power distribution network of the microgrid in order to stabilize one or more cyclic loads on the power distribution network and to maintain the non-stabilizing group at a substantially constant load.

This invention discloses a simulation method, apparatus, equipment, and medium for an electromagnetic railgun. Compared to constant load parameter values, it employs a finite element method combined with equivalent circuit analysis. The rail is divided into N segments, and the armature is positioned at the end of the i-th segment. The current equivalent load parameters of the rail are updated based on the circuit parameters at each discrete time point, thereby approximating the true value of the equivalent load parameters segment by segment. The current equivalent load parameters are then substituted into the circuit and mechanical equations to calculate the discrete data when the armature is positioned at the end of the i-th segment. If i < N, let i = i + 1, and iterate the above simulation steps; if i = N, then fit all the calculated discrete data between the armature velocity and discrete time points to obtain continuous data between the armature velocity and time. It is evident that this invention corrects the equivalent load parameters whenever the armature moves a certain distance, thus simulating an electromagnetic railgun firing process that more closely approximates the real situation.

The invention discloses a method for controlling the fatigue life of a forged aluminum alloy hub, and belongs to the technical field of automobile hub manufacturing. The method is characterized by comprising the following steps: 1) under the conditions that the action of other external forces on a hub is not considered and the loading of a load spectrum is constant, the fatigue life of the hub is controlled by controlling an applied load according to real stress and controlling the amplitude of the real stress and a constant load ratio; and 2) according to fatigue simulation of the forged aluminum alloy hub, directly determining the relationship among the real stress amplitude delta sigma, the load ratio R and the fatigue life N. The method has the advantages that the fatigue life of the forged aluminum alloy hub can be controlled by controlling the actual stress amplitude and the application of the load ratio, the fatigue life is calculated according to the actual stress amplitude and the load ratio, the fatigue life of the forged aluminum alloy hub is accurately controlled, and the anti-fatigue performance of the forged aluminum alloy hub is effectively controlled.

To provide a hot-melt type adhesive composition which is excellent in 180-degree peel adhesive force, constant load holding power and shear retention force among adhesive characteristics and has high removability and to provide an adhesive tape having an adhesive layer composed of the adhesive composition.SOLUTION: There is provided a hot-melt type adhesive composition which comprises at least an acrylic block copolymer (X), an acrylic block copolymer (Y) and a tackifier resin (Z), wherein the acrylic block copolymer (X) has a weight average molecular weight (Mw) of 50000 to 400000 and is liquid at 23°C, the acrylic block copolymer (Y) has a weight average molecular weight (Mw) of 100000 or less and is liquid at 23°C and the tackifier resin (Z) has a softening point of 110°C or more.SELECTED DRAWING: None

The invention discloses a hydrogen environment metal material constant load testing device and a CTOD-based testing method.The high-pressure gas storage bin in the device is connected with an upper bin cover and a lower bin cover in a sealed mode, the upper bin cover is provided with a gas inlet pipeline, the lower bin cover is provided with a gas outlet pipeline, the high-pressure gas storage bin is filled with hydrogen, the upper bin cover is provided with an upper loading rod, and the upper loading rod is provided with a lower loading rod; the upper end of the upper loading rod is connected with a mechanical testing machine loading head, the lower end of the loading rod extends into the high-pressure gas storage bin, a load sensor is installed on the upper loading rod in the high-pressure gas storage bin, a lower loading rod is arranged on the lower bin cover, the upper end of the lower loading rod extends into the high-pressure gas storage bin, and the lower end of the lower loading rod is connected with a mechanical testing machine base. A constant-load sample is connected between the upper loading rod and the lower loading rod, an extensometer is mounted on the constant-load sample, and a temperature sensor and a pressure sensor are mounted in the high-pressure gas storage bin. The device can effectively provide a high-pressure hydrogen test environment, the method is not limited by the wall thickness of the pipe, and the fracture toughness value of the sample in the hydrogen environment is obtained.

The application provides a method and device for determining a bridge closure position based on a first-stage dead load internal force distribution and a storage medium, and relates to the technical field of bridge construction. The method comprises the following steps: obtaining a candidate closure position of a target bridge; performing a first-stage dead load stress state analysis based on a pre-established full-bridge finite element model to obtain a first-stage dead load internal force state analysis result; calculating a construction convenience index, a construction period index, an adjustment measure index and other influence factor indexes according to the influence of the target bridge based on the first-stage dead load internal force state analysis result; calculating a closure index of each candidate closure position based on the construction convenience index, the construction period index, the adjustment measure index and the other influence factor indexes; and taking the candidate closure position with the minimum closure index value among all the candidate closure positions as the target closure position. The method provided by the application can quickly and effectively determine the bridge closure position.

The invention discloses a bevel gear power closed transmission system variable speed loading optimization method, and belongs to the field of gear transmission system loading test method optimization. The problem that according to an existing variable speed loading method, constant load loading or simple program control step loading exists, and consequently loading time is long is solved. According to the method, the dynamic characteristics of the bevel gear closed power system are analyzed, and a novel dynamic characteristic value is calculated by collecting a vibration signal and a vibration acceleration signal of the system. The optimal test loading sequence is determined by ingeniously applying a quantum particle swarm optimization method, and the method is mainly applied to the bevel gear power closed loading test.

This invention relates to the field of fatigue performance enhancement technology for metallic materials, and more particularly to a method for improving the fatigue performance of notched components in high-temperature metallic structural materials. Addressing the problem of fatigue failure in notched components of high-temperature metallic structural materials under alternating loads, this invention proposes a method to improve their fatigue performance through pre-creep treatment. This invention applies a controlled constant load or constant stress to the notched component at high temperature and maintains it for a certain period, causing controllable creep at the notch root. This achieves stress relaxation and redistribution, forming a favorable residual stress state and / or microstructure, weakening the notch effect and improving fatigue life. This method has good versatility and can be applied to different types of metallic structural materials, especially suitable for high-temperature fatigue-related components under complex service environments.

The invention provides a support pre-pressing construction method, and relates to the field of bridge engineering. The method comprises the following steps: laying a bottom die after a bracket is accepted and accepted, and pre-pressing by adopting a sandbag (the weight is greater than or equal to 1.2 times of dead load of a box girder, and the pre-pressing period is greater than or equal to 14 days); loading in four stages until the total weight is 30%, 60%, 100% and 120%, observing every 8 hours after loading in each stage, and carrying out the next stage when the settlement difference is less than or equal to 2mm for three times continuously; after loading is completed, observing to be qualified, and unloading in a grading manner according to a principle of loading first and unloading second; the deformation is calculated according to the pre-pressing data, the elevation and the pre-camber of the formwork are adjusted, and finally the supporting system is reinforced; the safety of the support can be verified, inelastic deformation is eliminated, a basis is provided for pre-camber setting, and the construction quality and safety of the box girder are improved.

This invention belongs to the field of materials testing technology and discloses a device and method for testing the hydrogen content of metallic materials. The testing device includes a reaction vessel and multiple constant-force loading structures. The reaction vessel surrounds a fixed chamber filled with test gas and electrolyte solution. The multiple constant-force loading structures are located in the fixed chamber. Each constant-force loading structure includes a clamp assembly and a loading assembly. The clamp assembly includes a first clamp and a second clamp, with the second clamp having a blank test position. The loading assembly includes a first pull rod, a rotating nut, and an elastic element. Tightening or rotating the nut applies a load to the loaded sample. By precisely controlling the deformation of the elastic element, the load applied to the loaded sample can be ensured to accurately reach a preset value, achieving precise control of the constant load to test the hydrogen embrittlement sensitivity of the sample under different load conditions. The multiple constant-force loading structures can simulate various different load conditions, facilitating simultaneous parallel comparison tests under multiple conditions and improving testing efficiency.

The invention discloses a large-span arch bridge live load bending stress active control method based on an influence matrix, and relates to the technical field of bridge engineering, and the method comprises the steps: constructing a refined finite element model containing material and geometric nonlinearity; a dead load-long-term effect influence matrix is constructed, and the initial adjustment amount of the closure gap enabling the total bending moment decreasing amplitude to be larger than or equal to 30% is solved; a typical live load working condition and a control target are determined; constructing a live load bending stress control influence matrix, solving the additional adjustment amount, and superposing the initial adjustment amount to obtain the optimal adjustment amount of the closure gap; in the construction stage, the optimal adjustment amount of the closure gap is achieved by adjusting the cable force of the buckle cable, and the actual bending stress of the control section under each typical live load working condition is monitored and verified on site after the bridge is formed. According to the method, full-load collaborative optimization can be achieved, the consumption of main arch materials is reduced, the method is suitable for multiple types of arch bridges, and control precision, engineering practicability and economical efficiency are considered.

The application discloses a kind of compaction bulk filling material resistivity characteristic testing device, belong to geotechnical engineering and mining engineering technical field, including bulk filling material compaction unit and resistivity test unit;Compaction unit can realize the constant load compaction of bulk filling material, and the target compaction state of sample is maintained by locking clamp, to avoid unloading rebound;Resistivity test unit can realize the axial height adjustment of test probe and the adjustment of different angles of compaction box circumference, without transferring sample to complete the resistivity in-situ test of different compaction states, different spatial positions.The application realizes the integration of bulk filling material compaction and resistivity test, solves the problems of sample disturbance, compaction state and test working condition mismatch, incomplete test dimension in the prior art, and can accurately obtain the correlation between bulk filling material compaction degree and resistivity, to provide reliable experimental data support for resistivity detection of goaf filling body density.

The utility model relates to the technical field of steel cord production, in particular to a novel pre-deformation device of a steel cord stranding machine, which comprises a bottom plate, bearing components are fixedly mounted at two ends of the bottom plate, the same steel wire is lapped on the two bearing components, two adjusting plates are fixedly mounted on the bottom plate, and the adjusting plates are fixedly mounted on the bottom plate. The tops of the two adjusting plates are slidably connected with the same elastic jacking assembly used for adjusting the tension of the steel wire, and a driving assembly used for driving the elastic jacking assembly to slide is fixedly installed on the side wall of one adjusting plate. According to the utility model, a steel wire to be stretched is erected on the two bearing assemblies, the bottom of the elastic jacking assembly abuts against the steel wire, and the driving assembly drives the elastic jacking assembly to tension the steel wire, so that the steel wire reaches the maximum deformation quantity, and the steel wire is kept in a relatively stable state before being stranded; and the subsequent twisting forming process operation of the steel cord is facilitated, so that the constant load elongation and the elongation at break of the formed steel cord are improved.

Provided is a biodegradable three-dimensional network structure having excellent compression recoverability and repeated compression characteristics after thermal compression at a use ambient temperature. A three-dimensional network structure having a three-dimensional random ring-bonded structure, the three-dimensional network structure being characterized in that the continuous lines are formed from a thermoplastic resin composition, and the thermoplastic resin composition contains 70 mass% or more of a poly (butylene adipate-co-terephthalic acid) resin, and the thermoplastic resin composition contains a polybutylene adipate-co-terephthalic acid) resin, the polybutylene adipate-co-terephthalic acid resin, and the polybutylene adipate-co-terephthalic acid resin. In a differential scanning calorimetry curve of the continuous lines measured using a differential scanning calorimeter, the enthalpy of an endothermic peak having a minimum value in the range of 30 DEG C to 70 DEG C is 2.5 J / g or less, and the average fiber diameter of the continuous lines is 0.1 mm to 3.0 mm (inclusive). The average fiber diameter of the surface layer part of the three-dimensional network structure is 1.05 times or more of the average fiber diameter of the inner layer part, the apparent density of the three-dimensional network structure is 0.01-0.20 g / cm3, the residual strain after repeated compression at a constant load of 750 N is 15% or less, and the hardness retention rate at 40% compression after repeated compression at a constant load of 750 N is 45% or more.

The application discloses a kind of decreasing type transient variable load loading device and test method, it is related to loading test simulation technical field.The application includes: first sliding mechanism, first slider is configured with linear sliding along first direction;Second sliding mechanism, second slider is configured with linear sliding along second direction;Constant load force mechanism is used to output constant load parallel with first direction, and load acts on the first slider;The first direction is vertically arranged with the second direction, the first slider is connected with the second slider by inclined connecting rod, the second slider is connected with the product to be measured on the side away from the first slider, the distance between the hinge point of the connecting rod and the first slider and the hinge point of the connecting rod and the second slider in second direction is less than the length of the connecting rod;Overcome the shortcomings of existing variable load loading system structure, small loading range, slow response, realize the purpose of instantaneous decrease of load.

The invention relates to a method for estimating the moment of inertia of an electric motor and load system during normal operation and the invariant load characteristics of the system. The method comprises the steps of: operating the electric motor in a normal operating mode having a constant load characteristic via the electric motor drive; estimating instantaneous mechanical power; calculating a difference in power integration during a speed increase and decrease of the electric motor, wherein the speed increase and decrease correspond to transients and / or disturbances; and calculating the rotational inertia according to the measured power difference integral. The invention also relates to an electric motor drive provided for carrying out the method.

The invention discloses a constant load supporting mechanism, a stirrer and a system, and the device comprises a fixed supporting device which is provided with a lifting device; the power output device is connected with a pressure output device through an adjusting device, a pressure adjusting piece is installed on the pressure output device, and the pressure output device is connected with the lifting device; wherein when the operation equipment is supported, the lifting device is installed below the operation equipment, and by presetting operation parameters of the power output device, the lifting device supports the operation equipment in a self-adaptive mode according to displacement changes of the operation equipment. According to the mechanism, the displacement problem between the supported mechanical equipment and the supporting device can be converted into the pressure problem, the height and the supporting force of the lifting device are adjusted in a self-adaptive mode according to the displacement change of the mechanical equipment, and the stability and the safety of the mechanical equipment under different working conditions are guaranteed; the defect of excessive support or incapability of supporting due to descending of a support foundation or frequent change of the position of a support object is overcome.