107 results about "Inertial load" patented technology

The invention discloses a wind power generation variable pitch load suppression method and system, and relates to the technical field of wind power generation variable pitch load suppression, and the method comprises the steps of basic data acquisition, basic data analysis, power generation rate analysis, load data analysis and load abnormity processing. Whether hydraulic variable pitch operation is carried out or not is judged, then whether the power generation rate of the wind driven generator is qualified or not is judged, the wind load, the inertia load, the gravity load and the hydraulic cylinder load of each blade are combined for analysis, then the load coupling value of each blade is obtained, and the load abnormal condition of the wind driven generator is obtained through analysis; the problem of limitation existing in the current wind power generation variable-pitch load suppression analysis process is solved, comprehensive and objective analysis of wind power generation variable-pitch load suppression analysis is achieved, and reliability and authenticity of a wind power generation variable-pitch load suppression analysis result are guaranteed.

The invention relates to the technical field of pumping unit pump indicator diagram solving, in particular to a method for inverting a pump indicator diagram through a ground indicator diagram, and the method comprises the steps: obtaining basic data of an oil well and ground indicator diagram data; determining identification key points based on the ground indicator diagram; the friction load data is subtracted from the load data of the ground indicator diagram, and the vibration load of the data subtracted from the friction load data is eliminated through filtering processing; subtracting the inertial load data from the data after the vibration load data is eliminated to obtain a corrected ground indicator diagram; and subtracting the sucker rod string load from the load data in the corrected ground indicator diagram, subtracting the corresponding stroke loss from the displacement data, further inverting a pump indicator diagram, and adjusting each parameter of the inverted pump indicator diagram according to a comparison result of the inverted pump indicator diagram and an actually measured pump indicator diagram. According to the method, the problem that when the damping coefficient is calculated, due to the fact that the number of damping coefficient parameters is large, damping coefficient calculation is not accurate, and the graph difference of the pump indicator diagram is large is solved through inversion of the pump indicator diagram.

The invention provides a large-inertia closed system inertia load hydraulic test bench, which comprises a driving system, a closed system and an inertia loading system, the driving system comprises a driving motor, the closed system comprises a closed pump and a closed system motor, the inertia loading system comprises an inertia loading loop, and the closed system comprises a closed pump and a closed system motor. The inertia loading loop comprises a loading motor, a proportional servo valve, an energy accumulator, a first one-way valve, a second one-way valve, a back pressure valve, a third one-way valve, a fourth one-way valve, an overflow valve and a fifth one-way valve. The test bed is mainly constructed by adopting hydraulic components, a large-inertia closed system can be moved to a hydraulic related test bed to carry out normal working condition and inertia load tests, so that the related closed system is tested and optimized, the overall performance of large-inertia equipment is improved, the research and development period is shortened, and the test bed is low in test cost, safe, reliable, small in size and easy to popularize. Related test beds do not need to be specially customized, the loading control mode is simple, different-flow closed system inertia load tests can be carried out, and adaptability is high.

The invention relates to the technical field of parallel robot control, in particular to a control method and system for a three-degree-of-freedom parallel robot. The method comprises the following steps that mechanical arm joint rotation range extraction is carried out on mechanical arm design parameters, stress limit bearing analysis between different joint rotation angles is carried out, and joint angle stress limit bearing data are obtained; moving inertia momentum simulation is carried out on the joint angle stress limit bearing data, then load jitter variance calculation is carried out, and inertia load jitter variance is obtained; feedback cooperative control design is carried out based on the inertial load jitter variance, and a manipulator feedback cooperative control strategy is obtained; and manipulator cooperative control firmware design is carried out based on the manipulator feedback cooperative control strategy, and manipulator cooperative control firmware is obtained. According to the invention, the parallel robot control technology is optimized, so that the parallel robot control technology is more perfect.

The present invention provides a topology optimization method based on sensitivity and dynamic grayscale suppression, which is used to solve the difficulty and inaccuracy of solving the topology optimization of turbine disks under inertial loads and fixed loads, as well as the grayscale unit problem in the topology structure optimization process. The method comprises the following steps: (1) establishing a topology optimization design domain for the radial section of the turbine disk; (2) designing a mathematical model for topology optimization; (3) calculating the elastic modulus E(x i ) is punished; (4) according to the finite element calculation, the displacement matrix U of the turbine disc section is obtained, and the objective function - structural strain energy C is further calculated; (5) sensitivity calculation; (6) according to the optimization criterion method, the update iteration is designed; (7) load sensitivity suppression method; (8) dynamic grayscale suppression method; (9) convergence judgment. The three-spoke turbine disc designed according to the present invention has the following beneficial effects: effectively bearing the centrifugal load of the turbine blades on the rim and the turbine disc itself, the arc structure of the rear spoke and the supporting structure is conducive to bearing the aerodynamic tangential load transmitted by the turbine blades on the rim; the setting of the holes makes the turbine disc lightweight; and meets the strength and stiffness requirements.

The invention discloses an excavator impact load calculation method which comprises the following steps: firstly, collecting the displacement and pressure of an oil cylinder of a working device of an excavator in a dynamic state, calculating and testing the actually measured oil cylinder force at an impact moment, and establishing a theoretical dynamic mathematical model; according to the established theoretical dynamic mathematical model, motion coordinates of a twisting point and a bucket tooth are calculated, and according to the motion coordinates and the gravity load of the excavator in the motion process, the theoretical mathematical model oil cylinder force of the working device is calculated by inputting assumed bucket tooth stress data; and finally, comparing the oil cylinder force of the theoretical mathematical model with the actually measured oil cylinder force at the impact moment to obtain an accurate impact load. The invention further provides a system for calculating the impact load of the excavator. The problems that in the prior art, special equipment needs to be used for excavation impact load testing, and testing data are different are solved. The impact load can be extracted more accurately only by collecting the pressure and displacement of the oil cylinder and considering the inertial load in the movement process.

The present application discloses a method, device, equipment and medium for dynamic load balance in aircraft dynamics analysis under a non-inertial system, and relates to the field of structural dynamics analysis, including: determining the inertial parameters of the aircraft finite element model, and calculating the position vector of the unit integration point based on the coordinates of the unit node; solving the rigid body motion based on the inertial parameters and the external load of the finite element model, obtaining the target vector, and determining the acceleration vector of each unit integration point according to the position vector and the target vector; determining the inertial load of the unit integration point based on the acceleration vector, generating an equivalent node inertial load through the inertial load, accumulating each equivalent node inertial load and the non-inertial system external load vector, and obtaining the node load vector of the non-inertial system; determining the unbalanced force and unbalanced moment according to the node load vector and the non-inertial system coordinate origin, and correcting the equivalent node inertial load to complete the load balance. The present application realizes the dynamic balance of the load in the non-inertial system.

The invention belongs to the field of aircraft model vibration active control, and discloses a multi-dimensional vibration real-time control method for a wind tunnel model supporting system. The method comprises the following steps: firstly, designing a multi-dimensional vibration monitoring layout and a multi-dimensional vibration suppression layout of a wind tunnel model support system, synchronously acquiring pneumatic load and inertial load design, and designing a multi-actuator cooperative control matrix; on the basis, a load signal is filtered to a target frequency domain based on Hilbert-Huang transform, the target frequency domain is equivalent to a dynamic load vector on a vibration suppression actuation surface, a two-dimensional PID controller is constructed based on a moment balance principle, and effective control over multi-dimensional vibration is achieved. And real-time and reliable control of multi-dimensional vibration in a complex flow field environment is realized. The method can guarantee the reliable development of the wind tunnel test, expands the test range of the wind tunnel test, and reduces the production cost of the wind tunnel test.

This invention relates to the field of intelligent machine tool technology, specifically to an intelligent machine tool equipped with a transverse movement mechanism, including an up-and-down transverse movement mechanism, a left-and-right transverse movement mechanism, a left-and-right micro-movement mechanism, and a pressure mold. The left-and-right transverse movement mechanism is mounted on the outer side of the up-and-down transverse movement mechanism, and the left-and-right micro-movement mechanism is mounted on the outer side of the left-and-right transverse movement mechanism. The pressure mold is located on the top of the left-and-right micro-movement mechanism. The core of this invention lies in eliminating the independent dedicated mounting plate and instead directly connecting the mold-moving assembly to the machine head frame. By eliminating redundant mounting plates and auxiliary connectors, the overall mass and inertial load of the moving parts are effectively reduced, which is beneficial to improving the dynamic response performance and motion accuracy of the system. Secondly, the direct connection method significantly compresses the structural space, making the layout more compact and significantly improving space utilization. Based on the simplification of the overall structure, the miniaturization and lightweight design of the machine head module are realized, providing a structural foundation for the deployment and performance improvement of the equipment in a limited space.

The present invention is applicable to the technical field of production detection of diesel generator sets, and provides a production detection system and a detection method for a diesel generator set, comprising a frame, a simulation component installed inside the frame, and an offset component installed on the top of the simulation component. A plurality of groups of buffer components are installed around the top of the offset component, and generator sets are arranged between the plurality of groups of buffer components. A locking component is installed on the top of each group of buffer components, and four groups of connecting components are installed around the top of the offset component. The device solves the problems of insufficient detection dimension and lack of comprehensiveness of testing. When the generator set completes the displacement swing detection, the electric slide rail drives it away from the center of the turntable, and then drives the motor to make the turntable linkage device perform centrifugal motion. After running for a preset time, the inertial load in scenarios such as hull turning is simulated, thereby alleviating the problem of insufficient detection dimension in complex environments.

The invention discloses a limited angle motor output torque rapid testing device and method.The testing device comprises a testing device structure, a motor driving circuit and an industrial personal computer provided with a data acquisition card, and the testing device structure comprises a rotating shaft, an inertia load, magnetic steel and a magnetic angle encoder; one end of the rotating shaft is provided with a notch matched with a motor output shaft to be tested, the other end of the rotating shaft is fixedly provided with magnetic steel, the middle section of the rotating shaft is provided with an inertia load, the rotating shaft is provided with a bearing, and the magnetic angle encoder is arranged at a position opposite to the magnetic steel. The device can be used for testing the output torque of the motor under the environmental conditions of high and low temperature, vibration and the like.

The invention provides a leg structure of a half-horse robot and the half-horse robot, the leg structure comprises a thigh, a shank, a thigh adduction and abduction joint, a thigh pitching joint and a knee joint, the thigh adduction and abduction joint is connected with the thigh through the thigh pitching joint; the thigh adduction and abduction joints can drive the thighs to adduction and abduction, and the thigh pitching joints can drive the thighs to swing front and back; the thighs are connected with the shanks through the knee joints, and the knee joints can drive the shanks to rotate. According to the leg structure, the half-horse robot has a pure foot type working mode and a wheel foot type working mode, the steering freedom degree is achieved in the wheel foot mode, in-situ steering can be achieved, and the flexibility of the robot is improved. A rotation actuator of the knee joint is arranged on the upper portion, the inertia load of the tail end of the leg is relieved, when the leg structure swings at a high speed or falls to the ground, dynamic response of the shank part is agile, impact is small, and overall movement of the robot is stable and efficient.

A method for determining friction force of a three-section telescopic mast sail comprises the steps that in order to calculate the friction force requirement of the three-section telescopic mast sail, wind loads, inertia loads, structural sizes and the like serve as design input, counter-force of all fulcrums is calculated through an equation set of force and torque, and the friction force of the three-section telescopic mast sail is obtained by combining the inclination angle and the friction coefficient between masts; the method for calculating the friction force of the sail of the three-section lifting mast is formed and used for model selection and design of a hydraulic cylinder of a sail boosting system and a target ship generator. The reaction force of each fulcrum of the third mast and the second mast can be calculated through the lateral force and the structural size of the third mast; according to the measuring force and the structure size of the second section and the third section, the bearing reaction force of each fulcrum of the second section of mast and the first section of mast is calculated; the friction force of the three-section telescopic mast sail can be quickly calculated through parameters such as lateral force, structural size, relative angle of each section of mast, friction coefficient and the like.

The present invention provides an energy-saving multi-stage screw air compressor, comprising a housing, a screw, a drive motor and a planetary gear mechanism. The compressor realizes progressive starting of the screw through a first drive mechanism and a second drive mechanism connected by the planetary gear mechanism. In the initial startup, the first drive mechanism with low speed and high torque drives the screw to overcome the inertial load, and then the second drive mechanism with high speed intervenes to accelerate the screw to maximum working efficiency. At the same time, the reset mechanism ensures that the first drive mechanism returns to its original position after separation, and the switching mechanism realizes smooth switching of the drive mechanism. The present invention can effectively improve the service life of the motor, enhance the stability and reliability of the compressor, reduce maintenance costs, and prevent gas backflow and protect the motor through the disconnection design, which has significant energy-saving effects and practical value.

The disclosure presents a shaftless, brushless motor for rotating any optical or sensing element (e.g., a lens or mirror) at a distal end of a waveguide that also delivers electromagnetic radiation (e.g., light). Herein, the waveguide itself functions as the axle on which rotating components rotate, thereby avoiding blind spots and overcoming limitations in existing “micromotors”. The shaftless, distally driven motor significantly reduces motor size, while extremely small inertial loads and bearing sizes allow for high pitch cylindrical scanning with longitudinal velocity uniformity.

The invention relates to a self-adjustable inertial load bearing mechanism for a control surface of a transportation aircraft, and belongs to the field of control surface design of transportation aircrafts. The mechanism is simple in composition and clear in load transmission path, the inertia load pull rod assembly 10 arranged on the control surface rotating shaft is directly connected to the hinge bolt 8 of the hinge axis to bear inertia load, and the phenomenon that a hinge joint of a traditional suspension mechanism bears out-of-plane load and deforms to cause deflection and clamping stagnation of the control surface is avoided; the inertia load is effectively transmitted to the airfoil main force bearing structure 2 through the inertia load pull rod assembly 10 all the time, and the self-adjusting purpose is achieved. Meanwhile, knuckle bearing standard parts can be selected on all the suspension joints and the hinge joints, and special knuckle bearings which are long in service life and high in cost are avoided.

The invention discloses a hydraulic system and a high-pressure large-flow inertia load hydraulic test bench and method, and the hydraulic system comprises a loading oil cylinder which comprises a first bidirectional hydraulic cylinder and a second bidirectional hydraulic cylinder; the reversing valve is connected with the loading oil cylinder and comprises a first reversing valve and a second reversing valve; a first inertia loading guide hydraulic cylinder; a second inertia loading guide hydraulic cylinder; the first inertia loading motor is connected between the two oil ports of the first inertia loading guide hydraulic cylinder; the second inertia loading motor is connected between the two oil ports of the second inertia loading guide hydraulic cylinder; and the plurality of switch valves are used for switching the connection relationship between the loading oil cylinder and the reversing valve, and under the action of the reversing valve, the first bidirectional hydraulic cylinder and the second bidirectional hydraulic cylinder realize a bypass working mode, a series working mode and a parallel working mode.

The invention discloses a scroll plate stress-strain analysis method based on a finite element model, and relates to the technical field of scroll compressors, and the method comprises the following steps: establishing a dynamic and static scroll plate model, and assembling the static scroll plate model and the dynamic scroll plate model; performing pretreatment on the assembled dynamic and static scroll plate model, eliminating fine features, and completing establishment of a fluid domain; performing steady-state thermal calculation on the scroll plate model by using the temperature data as a boundary condition to obtain temperature distribution of the scroll plate model; loading an inertia load by taking the temperature distribution and the pressure data as a temperature load and a pressure load for stress-strain analysis, and outputting a final stress-strain result; the temperature distribution and the pressure data are used as the temperature load and the pressure load for stress-strain analysis, the inertial load is loaded, and the final stress-strain result is output, so that the problem of inaccurate load loading in the prior art is solved, and the precision and the reliability of stress-strain analysis are improved.

The application belongs to the field of comprehensive strength, and relates to a load calculation method and device of a helicopter auxiliary landing device. After the helicopter is stopped on the deck, the deck device fixes the lower end of the probe rod, and the external load borne by the helicopter includes gravity, inertia load caused by ship movement and wind load; the support reaction force is provided by the tire and the auxiliary landing device; all the friction forces are borne by the main wheel, and the tail wheel is a steering wheel and does not bear the friction force; the method comprises the following steps: stress analysis is carried out on the fixed helicopter, and a load balance equation is established; and the load of the helicopter auxiliary landing device is solved according to the load balance equation.

The application discloses a kind of aero-engine main bearing dynamics analysis method and system under motor flight condition, method includes, the dynamics model of rotor-support system under motor flight state is established, additional excitation force size under motor flight state is calculated;According to the load distribution law of shafting under the action of additional excitation force, the support reaction force of each support and the additional inertia load borne by main bearing are extracted, the coupling mechanism of the dynamic characteristics and elastohydrodynamic lubrication characteristics of main bearing is researched, the balance condition of coupling equation is proposed, and the main bearing thermal elastohydrodynamic lubrication coupling model is established;According to the mutual contact / collision action between typical interfaces between elements in bearing, a contact / collision action model considering lubrication is established;Considering the additional inertia load varying with time, based on the established main bearing thermal elastohydrodynamic lubrication coupling model, considering the force between main bearing interfaces, numerical integration is used to solve, realize the accurate analysis of the dynamic characteristics and vibration response mechanism of aero-engine main bearing.

The invention relates to the technical field of engineering machinery, in particular to a load measuring method and system applied to a rotary platform of an excavator. The excavator revolving platform is provided with at least one target measurement area, at least one strain gauge group is arranged in the target measurement area, and the method comprises the following steps: acquiring actually measured strain data corresponding to each strain gauge group, and generating an actually measured data matrix according to the actually measured strain data corresponding to all the strain gauge groups; calculating simulation strain data corresponding to each strain gauge group according to a preset excavator model, and generating a simulation data matrix according to the simulation strain data corresponding to all the strain gauge groups; and calculating target load data of the excavator revolving platform according to the actually measured data matrix and the simulation data matrix. On the basis of the preset strain gauge group, load measurement is carried out on the external load and the inertial load of the excavator revolving platform in a mode of combining virtual simulation and actual measurement, and the position of a measurement device does not need to be iteratively adjusted for multiple times, so that the load measurement efficiency is improved.

The invention relates to the field of vortex plate stress analysis, in particular to a method for accurately analyzing stress and strain of a vortex plate. The method comprises the following steps: 1, establishing a vortex plate three-dimensional model; 2, performing transient solution on the fluid domain; 3, analyzing a static structure; 4, calculating steady-state heat; and 5, calculating an inertial load, and completing comprehensive stress-strain analysis of one-way coupling. According to the method, a CFD method (computational fluid mechanics) is combined with commercial software, a VLES turbulence model is innovatively introduced, the proportion of turbulence modeling and turbulence analysis can be adaptively adjusted through a resolution control function, the influence of grids on a calculation result can be weakened on the premise of ensuring calculation precision, and calculation resources are greatly saved. According to the method, the flow field distribution of the vortex compression cavity is calculated according to the temperature and the pressure of the vortex tooth surface, so that the load data at the fluid-solid coupling interface is obtained, and compared with a traditional simplified method, the temperature and the pressure of the vortex tooth surface calculated by the CFD method are more consistent with actual conditions, so that the structural strength analysis result is more reliable.

This invention relates to a tail fin structure with independent pitch and roll movements, comprising a pitch mechanism, a roll mechanism, and a connecting mechanism. The pitch mechanism includes a pitch servo and a pitch linkage, while the roll mechanism includes a roll servo and a transmission gear. The connecting mechanism includes a universal joint and a universal joint limiter. The pitch servo drives the tail fin to pitch movement via the pitch linkage. The roll servo drives the universal joint to rotate via the transmission gear, with the tail end of the universal joint connected to the tail fin to complete the roll movement. The rotation center of the pitch mechanism coincides with the center of the universal joint, and the left and right swing degrees of freedom of the universal joint are limited by the universal joint limiter, achieving independent control of pitch and roll movements. This invention allows for completely independent roll and pitch movements, significantly reducing the control precision requirements of the motor. The invention has a simple structure and reasonable design. The single-plane tail fin structure of this invention has strong wind resistance during flight and also has advantages such as low inertial load on the motor and high drive efficiency.

The application relates to a rotary switch cooperatively regulated tail edge air blowing gust generator and a use method thereof, and belongs to the technical field of wind tunnel tests. The rotary switch cooperatively regulated tail edge air blowing gust generator comprises a wing profile shell assembly, a gas supply pipeline assembly, a rotary switch assembly and a control system. The tail edge of the wing profile shell is provided with a multi-nozzle array, the rotary switch is composed of independent detachable rotary shaft units, the air blowing flow variation law can be changed by adjusting the installation combination of the rotary shaft units corresponding to the nozzles, and various customized gust outputs with consistent or inconsistent main frequencies and consistent or inconsistent phases can be realized. The control system adopts a PID or model prediction control algorithm, the rotary shaft rotation angle is fed back through an encoder, the gas supply mass flow is monitored through a flowmeter, the rotary shaft rotating speed and the gas supply pressure are cooperatively adjusted in a closed loop, the amplitude drift and the frequency deviation problems of the gust field caused by the air source fluctuation and the flow field interference under open loop control are solved, and the stability and controllability of high-speed / high-frequency gusts are significantly enhanced. The application has no inertial load and compact structure, and can be adapted to various wind tunnels.

The invention belongs to the technical field of ventilation and fan manufacturing, and discloses a stress-optimized bearing system and a manufacturing method thereof.The stress-optimized bearing system comprises a conical shaft core with a shaft core large-head end and a shaft core small-head end, and the diameter of the shaft core large-head end is larger than that of the shaft core small-head end; the bearing is matched with the conical shaft core, and an inner hole of the bearing is of a conical structure matched with the shaft core; a wear-resistant sheet is arranged at the small shaft core end of the conical shaft core; according to the bearing system, when the fan rotor operates, the gravity center of the rotor is located in the bearing and corresponds to the large head end area of the shaft core; the gravity center of the rotor is borne by the large end of the conical shaft core, and the inertia load of the small end of the conical shaft core is reduced through the weight reduction groove, so that the stress distribution of the bearing inner hole of the bearing is uniform, and the wear resistance of the wear-resistant sheet is improved; and continuous lubrication under the high-speed working condition is ensured, and the jamming fault is reduced.

The present invention relates to a parallel-driven three-degree-of-freedom motion platform, comprising a workbench, wherein a fixed frame is arranged on the workbench, a vertical frame is arranged on the fixed frame, a horizontal frame is arranged on the vertical frame, a rotating frame is rotatably connected to the horizontal frame, a connecting wheel group is arranged on the rotating frame, and a driving mechanism is arranged on one side of the fixed frame; a transmission wheel group is arranged on the fixed frame and the vertical frame; when the parallel-driven three-degree-of-freedom platform moves, the load is borne by four driving motors at the same time, thereby reducing the rated power of the motor to one-fourth of the original; the driving motor is installed on the outside of the motion structure, and when the motion structure is adjusted, the driving motor does not need to move with the motion structure, thereby reducing the inertial load of the motion structure, improving the stability of the motion structure, and also improving the efficiency of the motion structure adjustment.

This utility model belongs to the technical field of testing equipment, specifically a rudder system load simulation testing device, comprising: a frame and a testing component mounted on the frame; the testing component includes a testing mechanism mounted on the frame, a load mechanism mounted on the frame and located on the side of the testing mechanism, and a mounting base mounted on the frame; the testing mechanism includes a housing mounted on the side of the frame, a motor fixed inside the housing, a drive shaft connected to the drive end of the motor, a torque sensor located in the middle of the drive shaft, and an angle encoder mounted at the end of the drive shaft. This utility model, through the testing component, can reproduce inertial loads, elastic loads, and damped loads using the magnetic powder brake, variable stiffness spring assembly, and hydraulic damper in the load mechanism. Compared with traditional fixed weight loads, the dynamic characteristic simulation is more accurate, and the test data is more comprehensive.

The invention discloses a reducer self-checking platform with a working feedback function, which belongs to the technical field of reducer testing, and comprises a planetary disk with a plurality of driven gears, wherein a transmission gear meshing with the plurality of driven gears and fixedly connected to an output shaft on the reducer is arranged at the axis center position of the planetary disk; the invention uses a flywheel disk transmission structure as an inertial load, and arranges detection structures in two orthogonal directions of the planetary disk, and simulates actual operating conditions by changing parameters such as the angular acceleration and the rotation speed of a motor, and feeds back a self-checking mode of the operating state of the output shaft of the reducer by detecting the transmission states of the plurality of driven gears. Compared with only arranging a sensing detection structure at the output shaft that moves with the output shaft, a plurality of detection structures are statically installed and circumferentially distributed, and the transmission characteristics of the reducer in different directions during operation are fully captured, and the accuracy of the self-checking feedback is effectively improved.

The present invention discloses a test method for a traction drive system of a rail vehicle with adjustable inertial load. Based on a test platform for the traction drive system of a rail vehicle, the load is loaded and adjusted by means of inertial load adjusting devices on both sides of the output shaft of the gearbox, and the method includes the following steps: collecting relevant parameters of the simulated rail vehicle; calculating the load value to be loaded on the test bench; calculating the number of load elements to be equipped on the test bench; installing the load elements, controlling the test bench to conduct the test, and n equally distributing and installing the load elements on the first inertial load adjusting device and the second inertial load adjusting device, and using an operating console to control the traction motor for traction, uniform speed, coasting and braking, so as to conduct the test on the traction drive system of the rail vehicle. The test method of the present invention can quickly follow the change of the angular acceleration of the traction drive system, accurately simulate the load fluctuation phenomenon caused by the rapid change of the operating state of the traction drive system of the rail vehicle, and achieve high-precision test simulation.

This application belongs to the field of V-tail aircraft design, and specifically relates to a method and system for calculating the load parallel to the hinge axis of a V-tail aircraft. It assumes that the load parallel to the hinge axis of the V-tail aircraft conforms to the rotation axis ellipse equation distribution, and establishes the rotation axis ellipse equation; it sets a chord equation, the slope of which is an expression including the V-tail tilt angle; it solves the chord equation and the rotation axis ellipse equation simultaneously to obtain the intersection point coordinates; it solves the chord length based on the intersection point coordinates; it then reduces the chord length to obtain the inertial load of the tilted V-tail, i.e., the load parallel to the hinge axis. The rotation axis ellipse equation describes the coupled distribution of vertical and horizontal loads, and the intersection point is solved simultaneously using the chord equation, finally calculating the load value related to the tilt angle. This is the first time that the "composite function" and "geometric tilt angle" of the V-tail have been incorporated into the load calculation model, making the results more closely reflect the actual stress state and avoiding safety hazards or weight redundancy caused by incorrect coefficient selection.