28 results about "Mass system" patented technology

The invention relates to the technical field of flexible joint mechanical arm control, in particular to an optimization method for flexible joint parameter identification based on an anti-disturbance sliding-mode observer, which comprises the following steps of: deducing a torque mathematical expression of a connecting rod side according to a typical flexible joint kinematic model, and further performing position decoupling on the torque expression to obtain a flexible joint parameter identification model; and obtaining reference position input of the motor side. In the design of a torque observer, a sliding mode disturbance observer is used for estimating feedback torque and unknown disturbance of a dual-mass system of a motor and a connecting rod, and the disturbance comprises external contact torque, friction torque and the like, and also comprises system internal parameter fluctuation and the like. And finally, in consideration of irreversibility and ill-conditioned matrix problems existing when parameter identification is carried out by using a traditional least square method, a least square method identification process based on a ridge regression method is designed, and kinetic parameter identification is realized.

The invention discloses a multi-eddy current tuned mass damper suitable for inhaul cable multi-mode vortex vibration control. The multi-eddy current tuned mass damper is composed of a frequency modulation mass system and two damping-adjustable plate type eddy current damping systems. Wherein the frequency modulation mass system is composed of a main steel strand, two main mass blocks, two auxiliary steel strands and four auxiliary mass blocks; the plate-type eddy current damper comprises a permanent magnet group fixed on a mass block of the frequency modulation mass system, a conductor copper plate, an L-shaped magnetic steel plate for adjusting a gap between a permanent magnet and the conductor copper plate, and an eddy current damper cable clamp. The vibration frequency and the damping ratio of each mass block of the frequency modulation mass system are continuously adjustable, and the mass blocks can be assembled on site. Due to the fact that the frequency modulation mass system comprises six mass blocks and has six tuning frequencies, efficient control over multi-mode vortex vibration of the stay cable can be achieved through the multiple eddy current tuned mass damper, in addition, the frequency and damping of all the tuned mass damper elements are continuously adjustable, and optimal control over the stay cable can be achieved.

The present invention discloses a nuclear fusion armored superconducting coil flipping system and method, including a motor, a rotating shaft, a gear pair, a hemispherical tray structure, a bearing, a bearing box, an electromagnetic coil, and a positioning recess; it also includes a fastening and lifting upper splint, a fastening and lifting lower splint, a plurality of inner ring fastening bolts, and a plurality of outer ring fastening bolts; a superconducting coil is arranged between the fastening and lifting upper splint and the fastening and lifting lower splint; the outer ring fastening bolts and the inner ring fastening bolts are positioned on the upper surface of the hemispherical tray structure through the positioning recess; it also includes a receiving device and an industrial control computer. This system greatly reduces the labor intensity of flipping operations on superconducting coils, reduces the cost of manual errors and time costs, significantly improves flipping efficiency, and ensures the quality of superconducting coils. The system structure is sophisticated, easy to operate, and the stability and reliability are significantly improved, making it suitable for popularization and use.

The utility model relates to a multifunctional hybrid dynamic vibration absorption device which comprises a spring mass system, a magnetic force adjusting system and a passive dynamic vibration absorber part, and the passive dynamic vibration absorber part is of a cantilever beam structure. A spring mass system and a magnetic force adjusting system are installed on the cantilever beam structure. An adjusting mass block can be additionally arranged on the basic mass block, so that mass adjustment is realized. The elastic rod is of a cantilever beam structure, the position of the main mass can be adjusted through the adjusting screw, and therefore fine adjustment of rigidity is achieved. According to the utility model, an independent magnetic force adjusting system composed of the magnetic circuit mass block, the driving winding and the permanent magnet is provided, after the system is electrified, electromagnetic force can be generated in the vibration direction, and active control can be realized by matching with a sensor and a control system.

The application discloses a kind of high impact load under spring mass system dynamic response polarized optical measurement system and method, belong to optical measurement technical field, for analog launch load and service load etc. High impact load working condition of spring mass system, by constructing birefringent interference color feature unit on the surface of the base and mass block of spring mass system, using polarization dark field to filter background stray light, cooperate with high-speed camera, so that mass block presents as high-contrast color spot, through HSV color segmentation and relative displacement calculation based on motion coordinate system, the non-contact, clear and continuous measurement of millisecond transient displacement response of mass block is realized.The application effectively fills the experimental measurement blank of high overload dynamics, eliminates the interference of the increased mass caused by the introduction of sensor in contact measurement, and provides high-fidelity visual data support for the dynamic response research of spring mass system in high dynamic environment.

This invention belongs to the field of servo system load trajectory tracking technology, and relates to a command-filtered tracking control based on an extended state observer. The method includes the following steps: establishing a dynamic model and state equations for a two-mass servo system, initializing the system state and system parameters; estimating the load-side information, motor-side information, and total disturbance using an extended state observer; introducing a command-filtered control algorithm to approximate the derivative of the virtual control law, suppressing the differential explosion problem present in the backstepping method, and designing a virtual control function and a load tracking controller. This method achieves effective estimation of the system state and uncertain models, giving the system speed, stability, and accuracy, strong anti-interference capability, and excellent load tracking performance.

The present invention relates to a computer device (10) and to a method for testing a capacitive sensor by measuring, at least once, a measurement curve of a change in a measurement variable (x) over time, which measurement curve reflects a position of a sensor mass (16) which is adjustably connected to and / or in a mount (12) by means of at least one spring component (18a, 18b), and by determining at least one damping (D) of a spring-mass system formed by the sensor mass (16) and the at least one spring component (18a, 18b), taking into account the at least one measured measurement curve, wherein, in addition, a natural frequency (f0) of the spring-mass system is determined taking into account the at least one measured measurement curve, and, if the determined damping (D) falls below a first limit value (g1(f0)) which is dependent on the determined natural frequency (f0) according to a specified first function (g1(f0)), and exceeds a second limit value (g2(f0)) which is dependent on the determined natural frequency (f0) according to a specified second function (g2(f0)), it is determined that the capacitive sensor satisfies at least a specified minimum suitability.

In a method for determining a natural frequency of a spring-mass system of a sensor device, a plurality of measurements are taken, wherein a mass of the spring-mass system is deflected out of a rest position by a deflection force during each measurement and returns to the rest position after the deflection force has been switched off. A respective deflection curve over time is ascertained by ascertaining deflection values of the mass at corresponding sampling times at a specified sampling rate. For each deflection curve, deflection values are selected within a time period after the deflection force has been switched off. An averaged deflection curve is generated on the basis of the deflection curves for the plurality of measurements. The natural frequency of the spring-mass system is ascertained on the basis of the averaged deflection curve.

The invention relates to a variable rigidity-inertia synergistic low-frequency tuned mass system and a vibration absorption method. An arc-shaped groove is formed in the upper portion of a recovery unit, a rack is arranged on the arc-shaped groove, a rotating body of an inerter unit is meshed with the rack through a gear set, and a rotating shaft of the rotating body is connected with a rotating shaft of the gear set through a connecting frame; the connecting frame is connected with an upper structure, the recovery unit is connected with the tuning vibration absorption unit, the fixed rack rail is connected with a lower structure, a sliding rail is arranged beside the fixed rack rail, the tuning vibration absorption unit is erected on the sliding rail, a fixing shaft is arranged on the tuning vibration absorption unit, and a rotating body of an inerter flywheel is fixedly connected with a gear. The rotating body and the gear are sleeved on the fixed shaft, the gear is meshed with the fixed rack track, the first permanent magnet is embedded in the rotating body, and the second permanent magnet is arranged in a cavity of the rotating body. Compared with the prior art, multi-section broadening of the tuning frequency band, energy absorption, vibration reduction and low-frequency offset and self-adaptive recovery of the tuning mass system are achieved.

Systems and methods of the inventive subject matter are directed to control systems that create virtual mass in a haptic feedback system. Embodiments include a jog knob coupled with a PCB stator motor such that the PCB stator motor can be controlled to give the jog knob a feeling of mass that is different from its actual mass. Thus, a system of the inventive subject matter can be configured to continue a rotation as if it has a higher mass than it actually has, resulting in smoother rotations that last longer. This functionality can be useful to, for example, remotely control a camera's movements while still giving a user the feel of a comparable mechanical system.

The application relates to the technical field of landing gear load calculation, and discloses a landing gear landing load calculation method and device, which comprises the following steps: simplifying a buffer of a landing gear into a two-mass system to obtain an upper mass of an outer cylinder of the buffer and a lower mass of a piston rod, and constructing a target landing relationship function of the buffer according to the upper mass of the outer cylinder and the lower mass of the piston rod; constructing a motion state load function of the buffer, substituting the motion state load function into the target landing relationship function to solve, and obtaining a maximum vertical load parameter of the buffer; determining other load parameters of the buffer according to the maximum vertical load parameter, and determining landing load parameters of the landing gear according to the maximum vertical load parameter and the other load parameters. In this way, the reliability and accuracy of landing gear landing load calculation are improved through the two-mass system model of the landing gear; meanwhile, the landing gear landing load calculation process is simplified, so that the landing load calculation efficiency is improved.

In a method for determining the natural frequency of a spring-mass system in a sensor device, multiple measurements are performed. In each measurement, a mass of the spring-mass system is deflected from its rest position by a deflection force and returns to its rest position after the deflection force is removed. A corresponding time-dependent deflection profile is determined by measuring the mass's deflection values ​​at specific sampling times using a predetermined sampling rate. For each deflection profile, deflection values ​​within a time range following the removal of the deflection force are selected. An averaged deflection profile is generated from the deflection profiles of the numerous measurements. The natural frequency of the spring-mass system is then determined from this averaged deflection profile.

The invention provides a method for calculating radial eccentric wear force of a cylinder wall in a motion process, which comprises the following steps of: 1, analyzing the stress of a valve core, establishing a motion equation, and solving displacement x; 2, a 1D calculation model is established, and valve element movement, friction force and spring force are simulated; differentiating the differential displacement data x (t) to obtain the speed v (t) of the valve core, and fitting the speed v (t) into a one-element cubic equation; 3, establishing a CFD model, initializing a flow field, and setting a medium and a solver; 4, defining load and boundary conditions, and extracting radial force data; applying the fitted velocity equation v (t) to the dynamic grid through UDF; a safety valve element is simplified into a single-degree-of-freedom spring mass system, a force balance equation is established, the dynamic relation between hydraulic pressure and valve element displacement is directly coupled, acceleration sudden change and fluid dynamic response at the moment of opening of the valve element can be accurately captured, and the problem of stress analysis deviation caused by neglecting of the dynamic effect in a traditional method is solved.

The application provides a kind of rigid-flexible coupling spacecraft nonlinear stiffness softening effect prediction method based on improved multiscale method, the core is to improve the solution format of traditional multiscale method, for accurately predicting the nonlinear dynamic response of rigid-flexible coupling spacecraft, especially reveal the stiffness softening effect caused by coupling nonlinear inertial force and its influence on system stability.The method first establishes the dynamic model of the central rigid body-flexible beam-additional mass system, then obtains the accurate analytical expression through the reconstruction of multiscale method perturbation solution format, not only can clearly reveal that nonlinear coupling inertial force (Coriolis force, tangential inertial force, centrifugal inertial force) is the physical root of the overall stiffness softening of the system, and can quantitatively analyze the contribution of each inertial force, while having the advantages of strong applicability and comprehensive prediction ability.

The invention discloses a control system for water pressure of a strip steel aerial fog cooling nozzle. The method specifically comprises the following steps: respectively setting target water pressure values for two shunting headers on the upper and lower surfaces of cooling strip steel; the actual water pressure is monitored in real time through a water pressure gauge installed on the collecting pipe; water pressure deviation is calculated, and control signals are generated through control algorithms such as PID; the opening degree of the electric flow regulating valve installed on the header overflow pipe is regulated according to the control signal, and the water pressure of the header is accurately controlled by changing the overflow quantity and is stabilized at a set value. The strip steel cooling uniformity and the product quality can be effectively improved, the system response is fast, and the control precision is high.

This invention discloses a vibration reduction method for constant stiffness railway tracks. This method, while ensuring the absolute constancy of the track stiffness, utilizes the resonance principle to achieve effective vibration reduction through vibration absorbers, completely changing the traditional vibration reduction method that reduces track stiffness through a mass-spring system. In this method, vibration absorbers are pre-embedded in the track bed and foundation. Precise resonance tuning achieves the absorption and dissipation of vibration energy in specific frequency bands. The spring stiffness of the vibration absorber is calculated based on its own mass and the frequency band requiring vibration reduction, according to the formula for a single-degree-of-freedom undamped spring-mass system. A precise track-vibration absorber system model is established using a computer for dynamic simulation calculations to predict the system's vibration reduction performance. Based on the feedback information from the calculation results, the vibration absorber parameters and arrangement scheme are readjusted, and simulation calculations are performed again. Through iterative optimization, the vibration reduction requirements are met.

Test bench with torque transducers for measuring torques and a test bench control system, characterized in that the test bench control system is configured to execute a method for calculating the longitudinal acceleration of a motor vehicle with the following features: - The drivetrain, body and axles of the motor vehicle are modeled as a spring-mass system, - the body, axles and drivetrain components are represented as the massed bodies of the system, and the bearings of the components and subframe of the motor vehicle are represented as the springs connecting the bodies, - On the test bench, torques are measured at the wheels of at least one axle of the drivetrain, - a force exerted on the axle at the measured torques along the length of the motor vehicle is calculated and - The longitudinal acceleration of the body resulting from excitation of the system with the force is determined.

The present invention relates to a low-frequency tuned mass system and vibration absorption method with variable stiffness and inertia enhancement. The upper portion of a recovery unit is provided with an arcuate groove, on which a rack is provided. The rotating element of the inertial unit meshes with the rack via a gear set. The rotating shaft of the rotating element is connected to the rotating shaft of the gear set via a connecting frame. The connecting frame is connected to the upper structure. The recovery unit is connected to a tuning vibration absorption unit. A fixed rack track is connected to the lower structure. A slide rail is provided next to the fixed rack track. The tuning vibration absorption unit is mounted on the slide rail. The tuning vibration absorption unit is provided with a fixed shaft. The rotating element of the inertial unit flywheel is fixedly connected to a gear. The rotating element and the gear are sleeved on the fixed shaft. The gear meshes with the fixed rack track. A first permanent magnet is embedded in the rotating element, and a second permanent magnet is disposed in a cavity of the rotating element. Compared with the prior art, the present invention achieves multi-band widening of the tuning frequency band, energy absorption and vibration reduction of low-frequency offset, and adaptive recovery of the tuned mass system.

The invention provides a zero-order horizontal shear wave regulation and control method and device and application thereof, and relates to the technical field of metamaterials, and the method comprises the steps: carrying out the unit cell division of a single meta-structure element and a plate structure based on an anti-resonance principle, and carrying out the equivalent mass construction of divided unit cells, and forming a spring mass system; simple harmonic excitation force is applied to the spring mass system based on the Newton's law of motion, a mass motion control equation is established, the mass motion control equation is solved through an anti-resonance mechanism, and an anti-resonance geometric configuration is obtained; deducing the anti-resonance geometric configuration in combination with a cylinder approximation method and preset anti-resonance boundary conditions according to shear deformation characteristics of zero-order horizontal shear waves to obtain a superstructure primitive geometric parameter scheme; and regulating and controlling the propagation of the zero-order horizontal shear wave through the metasurface elements in different arrangement modes based on the metasurface elements with the optimal size in the metasurface element geometric parameter scheme. According to the method, the problem that the zero-order horizontal shear wave cannot be accurately and losslessly effectively controlled is solved.

The utility model relates to the technical field of engineering vibration control, and discloses a detachable eddy current tuned mass damper which comprises a mass system, a spring system and a detachable eddy current damping system, the mass system is composed of a mass block, a groove matched with a positioning shaft is arranged in the mass block, and the spring system is arranged in the groove. A dustproof cover is further arranged on the mass block, and an eddy current damping system is arranged in the middle of the mass block. The spring system is composed of a spiral compression spring, a positioning shaft, a spring limiting ring and a bottom plate and provides rigidity for the whole tuned mass damper. Through the detachable assembly composed of the permanent magnet back plate, the permanent magnet and the limiting sliding plate, when magnetic energy of the permanent magnet fades greatly, the eddy current permanent magnet assembly can be replaced on site, and the specific replacement steps are that the dustproof buckle cover is disassembled, then the connecting lugs on the permanent magnet back plate are separated from the end plates, the assembly can be taken out, and a new eddy current assembly is replaced.

The application provides a zero-order horizontal shear wave control method and device and application thereof, and relates to the technical field of metamaterials, and comprises the following steps: based on the anti-resonance principle, a single superstructure unit and a plate structure are divided into unit cells, an equivalent mass is constructed by dividing the unit cells, and a spring mass system is formed; based on Newton's law of motion, a simple harmonic excitation force is applied to the spring mass system, a mass motion control equation is established, the mass motion control equation is solved through an anti-resonance mechanism, and an anti-resonance geometric configuration is obtained; according to the shear deformation characteristics of the zero-order horizontal shear wave, the anti-resonance geometric configuration is derived by combining a cylindrical approximation method and a preset anti-resonance boundary condition, and a superstructure unit geometric parameter scheme is obtained; and based on the optimal size superstructure unit in the superstructure unit geometric parameter scheme, the propagation of the zero-order horizontal shear wave is controlled through superstructure units in different arrangement modes. The application solves the problem that the zero-order horizontal shear wave cannot be accurately and non-destructively controlled effectively.

The application provides an omnidirectional variable parameter eddy current tuned mass damper, and relates to the technical field of engineering structure damping, which comprises a support shell, a track guiding system, a counterweight mass system, an eddy current damping system, a spring system and a limiting buffer system; the support shell is used for bearing the tuned mass damper system and is fixed to a building; the track guiding system is used for supporting and guiding the eddy current damping system and the counterweight mass system; the number of counterweight mass plates in the counterweight mass system is adjustable; the eddy current damping system comprises a magnet steel, a conductor plate and an energy storage device and the like components, vibration mechanical energy is converted into electric energy by cutting magnetic induction lines of the conductor plate in a magnetic field, and the electric energy is stored; the spring system is used for buffering the counterweight mass system; the limiting buffer system is arranged at the end of the track guiding system, and extreme movement of the counterweight mass system is limited to prevent equipment damage. The application controls vibration amplitude and vibration frequency in multiple dimensions, and can also realize energy recycling.

The invention belongs to the field of shipboard aircraft landing gear tests, and particularly relates to a shipboard aircraft nose landing gear ejection impact test device and method. According to the carrier-based aircraft nose landing gear ejection impact test device, an ejection impact test is carried out on a special test bed, the hanging basket, the balancing weight and the landing gear jointly form an equivalent mass system, the ejection load loading / releasing mechanism simulates an ejector to load an ejection rod, and the containment tensioning mechanism simulates passive loading of a containment rod in the ejection process. According to the invention, the ejection impact condition of the carrier-based aircraft undercarriage can be simulated in a laboratory environment, the ejection impact dynamic response is measured, and a test basis is provided for the development of the carrier-based aircraft undercarriage.

The present invention discloses a numerical simulation method for suppressing the galloping of ice-covered conductors based on weights. According to the actual line parameters, a weight arrangement scheme is proposed. Based on the ice-covered conductor torsion model, the suppression effect of different weight arrangement schemes on the torsion angle is studied. Based on the modal analysis in ANSYS, the suppression effect of weights on galloping is analyzed. To achieve the above results, the present invention includes the following steps: S1: Conduct static simulation of the torsion of ice-covered conductors; S2: Determine the structural parameters of the weights. Assume that the cross-section of the ice-covered line is a typical crescent shape, with uniform ice covering across the entire span. Use the lumped parameter model to simplify the lumped mass system, combine the device with the entire line, and find the handle length L p and the optimal combination parameters of the hammer head mass M p that satisfy any torsion angle through the optimization equation. S3: As described in S2, the optimal mass calculated by the above optimization model is the total mass of the entire span.

The present invention discloses a dumbbell-type mass system buffer material vibration transfer characteristic test device, which relates to the technical field of material mechanical property testing. The upper pressure frame is connected to a desktop workbench or a vibration table top. The dumbbell-type mass system includes an upper mass, a connecting rod and a lower mass. The upper mass and the lower mass are respectively connected to the upper end and the lower end of the connecting rod. The connecting rod is connected to the desktop workbench through a linear bearing. The lower mass includes a plurality of weight-type masses. Buffer material samples are arranged between the upper pressure frame and the upper mass, and between the upper mass and the desktop workbench. The upper buffer material sample is connected to the upper mass. The connecting rod passes through the lower buffer material sample. The excitation sensor is arranged on the desktop workbench, and the response sensor is arranged on the upper mass. The present invention can test single-layer materials or double-layer materials and can ensure the stability of the mass system.

A method of controlling a gyroscopically-stabilized projectile, comprising a control system producing a control signal, a rotating aerodynamic shell, and a reaction mass system responsive to the control signal, the method comprising: imparting rotational and translational kinetic energy to induce gyroscopic stabilization of the projectile about a gyroscopic axis and a movement of the projectile along a flight path; interacting the shell with surrounding air while moving, to induce aerodynamic forces; generating the control signal from the control system; and altering a state of the reaction wheel system selectively in dependence on the control signal, to alter the flight path.

A method of controlling a gyroscopically-stabilized projectile, comprising a control system producing a control signal, a rotating aerodynamic shell, and a reaction mass system responsive to the control signal, the method comprising: imparting rotational and translational kinetic energy to induce gyroscopic stabilization of the projectile about a gyroscopic axis and a movement of the projectile along a flight path; interacting the shell with surrounding air while moving, to induce aerodynamic forces; generating the control signal from the control system; and altering a state of the reaction wheel system selectively in dependence on the control signal, to alter the flight path.

A clutch torque estimation and control method for vehicle hybrid powertrain includes, in response to detecting a mode transition of the hybrid powertrain that involves a state change of a disconnect clutch arranged between two torque generating systems, initializing a Kalman filter based on a state space model for dynamics of the disconnect clutch, utilizing the Kalman filter to predict estimated speeds and torques for the state change of the disconnect clutch, determining a set of constraints for the state change of the disconnect clutch based on a sign of a slip speed across the disconnect clutch, applying the set of constraints to the predicted estimated speeds and torques to obtain final estimated speeds and torques for the state change of the disconnect clutch, and controlling the disconnect clutch based on the final estimated speeds and torques to improve the mode transition of the hybrid powertrain.