127 results about "Balancing vibrations" patented technology

An unbalance identification and vibration suppression control system for a magnetic suspension rotating machinery comprises an unbalance identification module, an unbalanced force compensation module, a magnetic bearing power amplifier, an electromagnet rotor and a displacement sensor. Based on stable control of a magnetic suspension rotor, the unbalance of a magnetic bearing is identified in an online manner by a novel wave trap based on coordinate transformation, on one hand, the identification amount is used for compensating common-frequency current stiffness force, on the other hand, proper common-frequency current stiffness force is generated according to the identification amount to compensate common-frequency displacement stiffness force, and the influence of the low-pass characteristic of the power amplifier on compensation precision of the common-frequency displacement stiffness force is eliminated by leading a simplified inverse model of the magnetic bearing power amplifier into a feed-forward channel. When the magnetic suspension rotor rotates at a high speed, common-frequency bearing force is greatly reduced, and unbalanced vibration of the magnetic suspension rotor is remarkably suppressed. The unbalance identification and vibration suppression control system is simple, convenient, easy and particularly suitable for an actual high-speed magnetic suspension rotor system.

The present invention relates to a magnetic suspension reaction flywheel open-loop high-accuracy unbalanced vibration control system. It includes the following several portions: displacement sensor, displacement signal interface circuit, rotating speed detection device, magnetic bearing controller, magnetic bearing power amplification drive circuit and flywheel position identification device. The magnetic bearing controller includes axial bearing controller and radial bearing controller, the radial bearing controller is formed from two portions of stabilization controller and unbalanced vibration controller, in which the unbalanced vibration controller can be used for making compensation for displacement feedback of stabilization controller.

A magnetic levitation flywheel high-precision active vibration control system comprises a displacement sensor, a current sensor, a magnetic bearing controller and a PWM modulation and a power amplifier, wherein, the magnetic bearing controller comprises stabilization of the controller, eccentric estimation, magnetic force compensation and action of a switch. The magnetic levitation flywheel high-precision active vibration control system introduces the eccentric estimation and the magnetic force compensation on the basis of the stable control and utilizes the unbalance vibration parameters of a flywheel to carry out the compensation of the unbalance amount and the displacement negative stiffness of the flywheel within the entire rotation speed range, thus realizing the control of the unbalance vibration of the flywheel within the entire rotation speed range and allowing the flywheel to be operated around a principal axis of inertia with high precision during the whole process of speed increasing and speed reducing.

Vibrations at harmonic frequencies are reduced by injecting harmonic balancing signals into the armature of a linear motor/alternator coupled to a Stirling machine. The vibrations are sensed to provide a signal representing the mechanical vibrations. A harmonic balancing signal is generated for selected harmonics of the operating frequency by processing the sensed vibration signal with adaptive filter algorithms of adaptive filters for each harmonic. Reference inputs for each harmonic are applied to the adaptive filter algorithms at the frequency of the selected harmonic. The harmonic balancing signals for all of the harmonics are summed with a principal control signal. The harmonic balancing signals modify the principal electrical drive voltage and drive the motor/alternator with a drive voltage component in opposition to the vibration at each harmonic.

A method for balancing vibrations in a rotating machine is provided. The rotating machine has a first and a second plane of imbalance. The method includes determining a first set of solution mass vectors that includes a first solution mass vector for the first plane and a first solution mass vector for the second plane. Each first solution mass vector includes a mass and a phase angle. A first phase difference between a phase angle of the first solution mass vector for the first plane and a phase angle for the first solution mass vector for the second plane is calculated. The first phase difference is compared to a pre-selected value. If the first phase difference is less than the pre-selected value, the first set of solution mass vectors is retained. The first set of solution mass vectors is then incremented to create a second set of solution mass vectors that includes a second solution mass vector for the first plane and a second solution mass vector for the second plane. A second phase difference between a phase angle of the second solution mass vector for the first plane and a phase angle for the second solution mass vector for the second plane is then compared to the pre-selected value. If the second phase difference is less than the pre-selected value, the second set of solution mass vectors is retained. Finally, selected retained solution mass vectors are determined that balance the rotating machine such that vibration of the rotating machine is reduced.

The invention relates to a low rotating speed high precision control method of a control moment gyro gimbal servo system. The method solves the problems of friction interference and a disturbing moment caused by unbalanced rotor vibration of the control moment gyro gimbal servo system in a low speed operation process. The method comprises the steps of establishing a control moment gyro gimbal servo system kinetic model containing the friction interference and an unbalanced rotor vibration interference moment, performing control design on a frame servo system current loop via vector control andPI (proportional-integral) control methods, designing an interference observer to estimate equivalent interference formed by the friction interference and the disturbing moment caused by the unbalanced rotor vibration at a frame servo system speed loop, allowing the interference observer to offset an equivalent interference estimated value via a feedforward channel and designing a composite controller. The method has the advantages of high engineering practicability, high interference immunity and the like.

The invention provides an unbalance vibration control system of a bearingless asynchronous motor. The system consists of a directional inverse decoupling control system of a rotor flux linkage of the bearingless asynchronous motor and an unbalance exciting force feedforward compensation system, wherein the directional inverse decoupling control system of the rotor flux linkage of the bearingless asynchronous motor comprises an original system, an inverse system and four adjustors and realizes dynamic decoupling control of an electromagnetic torque, the rotor flux linkage and a random displacement component; the unbalance exciting force feedforward compensation system comprises an LMS self-adapted filter unbalance exciting force compensator and a force/flow conversion module and dynamically adjusts the unbalance displacement extraction speed and precision by using a simple step-length factor adjusting function; output of the feedforward compensation system and a steady random displacement current output by the inverse system are overlaid to form a magnetic suspension dynamic decoupling control system. The system provided by the invention cancels the links of online identification of a predictable load torque in the inverse system and a closed loop of a stator current of the original system, so that the influence of the unbalance exciting force can be effectively inhibited and the control precision and performance are improved.

The invention discloses an ultra-precision dynamic balancing device applicable to a micro rotor, which comprises a device fixing portion, a rotor supporting bracket portion, a rotor driving mechanism portion and an unbalanced vibration monitoring portion, and is characterized in that a supporting bracket fixing frame of the device fixing portion can slide on a guide rail, and a base for installing the guide rail is fixed on a bottom plate; the rotor supporting bracket portion can realize amplification for weak unbalanced vibration, and can be divided into two types of supporting structure forms according to different vibration amplifying scales; a motor of the rotor driving mechanism portion can drive an unbalanced rotor to rotate in a belt driving mode; and the unbalanced vibration monitoring portion acquires the unbalanced vibration amplitude and the unbalanced vibration phase of the rotor through a displacement sensor and a phase. Compared with a traditional dynamic balancing device, the device disclosed by the invention is simple in structure, small in size, high in measurement precision for the weak unbalanced vibration, and more applicable to ultra-precision dynamic balance of the micro rotor.

The invention relates to an active control method for minimal displacement of a magnetic suspension molecular pump rotor. A mathematical model of a generalized controlled object of a magnetic suspension rotor system is established by analyzing a formation mechanism of unbalanced vibration of the magnetic suspension rotor system. Channel controllers are designed based on the principle of linear auto disturbance rejection control. The unbalanced vibration of the system is regarded as an external disturbance, the disturbance is estimated and compensated in real time by using a linear extended state observer, and so same frequency compensation signals with appropriate amplitude and phase are superimposed on a control signal to offset rotor unbalanced exciting force to realize high speed and high precision rotation of the rotor around a geometric axis, thereby realizing the active control of the minimal displacement of the magnetic suspension rotor system. Compared with a conventional control method, the active control method has advantages of simple parameter adjustment, easy implement, small rotor whirl radius and high rotation precision, can greatly reduce rotation speed same frequency components in a displacement signal, and is of great significance for improving the performance and reliability of the magnetic suspension rotor system.

The invention relates to an unbalance magnitude online monitoring and de-weighting method in disc type workpiece processing, and brings forward a method for indirectly measuring unbalance magnitude of a disc type workpiece in processing through monitoring change of unbalance vibration signals of a main shaft, for overcoming the disadvantages in the prior art that dynamic balancing of a conventional disc type workpiece requires a special-purpose dynamic balancing machine, the balancing efficiency and the precision are low and the like. Based on the method brought forward by the invention, through monitoring of the unbalance state of the disc type workpiece in a processing process, formation and deterioration of too large unbalance magnitude of the disc type workpiece are prevented; and after the disc type workpice is processed, the clamping position of the disc type workpiece on a main shaft of a machine tool maintains unchanged, the unbalance magnitude of the disc type workpiece is measured in an online mode during rotation of the main shaft, and the unbalance magnitude of the disc type workpiece is reduced or eliminated through a method of controlling de-weighing of the machine tool. The method provided by the invention has great significance in improving the balance efficiency and precision of the disc type workpiece and reducing the balance cost.

The invention relates to a preparation method of a soil heavy-metal stabilizer, and belongs to the technical field of soil remediation and treatment. The preparation method comprises the following steps of a, preparing active charcoal, namely, drying organic matter, crushing, immersing by an alkali salt solution, and then firing under the protection of N2 so as to obtain the active charcoal; and b, preparing active organic composite charcoal, namely, mixing a sodium dithiocarbamate derivative solution with the active charcoal, carrying out balance vibration under a dark condition, then centrifuging, collecting a precipitate mixture, and drying so as to obtain the soil heavy-metal stabilizer. The preparation method of the soil heavy-metal stabilizer has the advantages that adsorption and fixing effects for heavy metal in soil are obvious; the absorption of heavy metal in soil cy plants or crops can be relieved effectively; the hazard of taking in heavy metal from crops by human beings is reduced.

A vibration characteristic measuring apparatus includes a magnetic bearing that generates magnetic force on the rotating body of a multi-stage centrifugal compressor, a displacement sensor that measures the vibration amplitude of the rotating body, a current amplifier that supplies a current to the magnetic bearing, and an excitation controller which outputs an excitation control signal for applying vibration to the rotating body and which measures the response characteristics of the vibration of the rotating body to the excitation control signal. The excitation controller outputs a rotating body control signal obtained by adding a vibration eliminating signal for eliminating unbalance vibration of the rotating body to the excitation control signal when measuring the response characteristics, and the current amplifier supplies a current that generates magnetic force in accordance with the rotating body control signal to the magnetic bearing.

The invention discloses a magnetic suspension bearing control device, a magnetic suspension bearing and a control method thereof. The device comprises a displacement feedback module (5) and a trappedwave unbalance vibration controller (4), wherein the displacement feedback module (5) is used for acquiring displacement information of a magnetic suspension rotating shaft (3) of the magnetic suspension bearing; the displacement information comprises rotary displacement information of rotation around a geometric center of a magnetic suspension rotating shaft (3) and unbalance displacement information of rotation around the centroid of the magnetic suspension rotating shaft (3); and the trapped wave unbalance vibration controller (4) is used for compensating the unbalance displacement information in the displacement information to obtain effective displacement information. By the scheme, the shortcomings of large unbalance disturbance, high control difficulty, poor running stability and the like in the prior art can be overcome, and beneficial effects of low unbalance disturbance, low control difficulty and good running stability are achieved.

The invention comprises a motor, a right angle support base, a cylinder elastic support whose both ends are flanges, a hollow shaft, a drive shaft, a L-shaped bracket, a dynamic balancing machine, and a train gauge coated on the cylinder elastic support. In the rotation plane of the crank shaft assembly, along with the orthogonal X,Y directions, simultaneously measuring the unbalance vibration or force signal of the crank shaft assembly running in high speed; after processed by computer, synthesizing the unbalance value along with different directions to form a closed curve graph. The invention also reveals a method thereof.

The invention discloses a balanced vibration system which comprises a magnetic circuit unit, a vibration unit and a shell, and the magnetic circuit unit and the vibration unit are located in the shell. Wherein the vibration unit comprises a balance iron core and a vibration diaphragm, the balance iron core is movably connected with the shell, the vibration diaphragm is fixed on the shell, and thebalance iron core can drive the vibration diaphragm to move. The magnetic circuit unit comprises a magnetic circuit coil and two magnet sets, the balance iron core is sleeved in the magnetic circuit coil, and the two magnet sets are located at the two ends of the axis direction of the balance iron core respectively. Each magnet set comprises two magnets, and the two magnets of the same magnet setare oppositely arranged on the two sides of the balance iron core. And when the magnetic coil is in a power-on state, the directions of the two magnet groups applied to the balance iron core are the same. Overall vibration of the iron core is balanced through the magnetic circuit unit and the vibration unit, so that the signal conversion efficiency is higher, power consumption is reduced, and distortion caused by unilateral vibration is eliminated.

The present invention relates to a magnetic suspension spherical flywheel imbalance vibration inhibition method. The Newton's second law and the gyro technique equation are employed to establish a magnetic bearing-rotor dynamics equation, based on the D'Alembert's principle, the disturbing force of imbalance mass moment on a rotor caused by deviation of rotor inertial axis from a geometrical axis, the disturbing force of the eccentricity on the rotor caused by the deviation of the rotor mass center from the geometrical axis and the disturbing force of the deflection negative moment on the rotor caused by suspension force passing through the rotor centroid and not passing through the rotor mass center are obtained. Rotor displacement amounts under the three disturbing forces are converted to the displacement amount under a sensor coordinate system and the displacement amount under a magnetic bearing coordinate system through a conversion matrix, the two displacement amounts are respectively acted in the controller and the magnetic bearing, and the feedforward inhibition method is employed to perform inhibition of the three disturbing forces. The magnetic suspension spherical flywheel imbalance vibration inhibition method can effectively improve the control precision of the imbalance vibration of the magnetic bearing-rotor system.

The invention discloses a vibration transmission test bench for a magnetorheological damper controlled gear box shaft system, comprising a test bench, a motor, a first rotating shaft, a second rotating shaft, a first gear, and a second gear. A test device is arranged on one side of the first rotating shaft, and a test device is arranged on one side of the second rotating shaft. The first gear fixedly sleeves the first rotating shaft. A first magnetorheological damper is arranged at the bottom of the first rotating shaft. The second gear fixedly sleeves the second rotating shaft. A second magnetorheological damper is arranged at the bottom of the second rotating shaft. The first gear and the second gear are connected by means of meshing. According to the vibration transmission test bench for a magnetorheological damper controlled gear box shaft system, the vibration of a gear box body can be monitored, and the currents of the dampers can be changed in a timely manner to adapt to different working conditions of the gear box body, such as vibration change in the process of speed change or unbalanced vibration increase caused by wear. Thus, it is ensured that the vibration of the box body and the transmission shaft is kept at a low level.

The invention discloses a grinding wheel balance vibration-absorbing device based on EAP (electroactive polymer) driving and a grinding wheel balance vibration-absorbing method based on EAP driving. The grinding wheel balance vibration-absorbing device based on EAP driving comprises an outer cover and a balance unit, an adjusting screw rod, a positioning slide rod, a driving rod and a counterweight unit. The driving rod controls and adjusts the screw rod to rotate through gear-rack engagement and then adjusts the position of the counterweight unit to achieve linear balance of a grinding wheel,and a first elastic support, a second elastic support, an elastic element, a main mass unit and a damping element are arranged in the counterweight unit to form dynamic vibration absorber effect withdamping. The grinding wheel balance vibration-absorbing device based on EAP driving has the advantages that vibration-absorbing balancing can be achieved timely and properly to avoid the defect thata traditional exterior balance head is untimely in treatment; a signal acquisition process is more precise to reduce exterior vibration interference; movable balance of a rotor is combined with dynamic vibration absorption on the basis of EAP driving, and metal rubber serves as the damping element, so that vibration is reduced and even eliminated, the grinding wheel is more stable to operate, andthe position and parameters of a counterweight are improved to subdue vibration conveniently.

The invention discloses a double vibration sensor-based rotor imbalance vibration response identification method which comprises the following steps: a, vibration sensors of the same model are mounted on two random axial directions x and y that are perpendicular to each other on a measurement cross section of a rotor bearing seat, a piece of light reflection paper is pasted on a rotor shaft, a rotation speed sensor is positioned opposite to the light reflection paper, and the vibration sensors in the direction x and the direction y and the rotation speed sensor are subjected to vibration signal and reference signal sampling operation; b, cross correlation technologies are used for extracting amplitude and phase positions of rotation frequency vibration in the direction x and the direction y; c, rotation frequency vibration signals in the direction x and the direction y are fused into a vibration ellipse; d, the vibration ellipse is broken into a clockwise vibration circle and an anticlockwise vibration circle, and the anticlockwise vibration circle is used for representing imbalanced vibration response. The double vibration sensor-based rotor imbalance vibration response identification method can help solve a problem that imbalanced vibration response of an anisotropy rotor system in a circumferential direction of kinetics parameters such as rigidity, damping and the like cannot be effectively identified via a single vibration sensor.

The invention belongs to the technical field of rotating equipment fault diagnosis and control, and particularly relates to a dynamic balancing method for high-speed rotors. According to the method, on the basis of acquiring vibration information of a rotor, vibration data at high speed and vibration data at low speed are cut down at the same scale through post processing, the interference of rotor measurement section profile error, phase discrimination mark, electromagnetic interference, bending and other non-imbalance factors is eliminated, and purification of unbalanced vibration is realized. Compared with a traditional dynamic balancing method, the method ensures precise acquisition of unbalanced vibration data and obviously improves the precision of dynamic balancing, and the method needs no phase discrimination sensors, reduces the dependence of a system to the installation space and reduces the complexity and the development cost of the system. Besides, the method has a wide range of applications, has a simple process, is conductive to the realization of computerized control, and has good practical application values.

The invention discloses an unbalance compensation method for rotor unbalance coefficient variable-angle iterative search. The method comprises the steps of vibration signal processing, variable anglecompensation algorithm recognition coefficient searching and compensation current calculation, wherein a vibration signal processing module calculates a rotor unbalance vibration signal amplitude according to rotor vibration information, rotor rotation angle information and rotation speed information; the variable-angle compensation algorithm is used for searching for recognition coefficients, the rotor unbalance vibration signal amplitude serves as the judgment basis, the unbalance coefficients are repeatedly identified and optimized through a variable-angle iterative search method, and a set of unbalance coefficients enabling the unbalance vibration amplitude to be reduced to the minimum are obtained through iteration. Corresponding compensation current is calculated according to the unbalance coefficient and input into the electromagnetic coil to restrain unbalance vibration of the rotor. The method can be used for an active rotor system with an active control unit, unbalance on-line compensation of the active rotor system is achieved, and unbalance vibration in the acceleration and deceleration operation process within the whole rotating speed range is restrained.

The invention discloses a dynamic balance method for a magnetic suspension molecular pump. After a motor of the magnetic suspension molecular pump is started, an unbalanced vibration control module is started; and if unbalanced mass of a rotor ensures that the maximum radial amplitude of the rotor is not greater than 1/2 a protection gap in a speed raising process under the control of the unbalanced vibration control module, the unbalanced vibration control module can inhibit the same frequency vibration of the rotor to ensure that the rotation speed of the rotor can exceed rigid critical rotation speed of the rotor quickly, so the rotor of the magnetic suspension molecular pump is subjected to dynamic balance in high speed. By the dynamic balance method, the rotor of the magnetic suspension molecular pump can be directly subjected to dynamic balance in high speed; and the steps are simple and the method is high in efficiency.

The invention discloses a self-balancing vibration and rubber pad shock absorption fluidized bed type ion exchange water treatment device. The self-balancing vibration and rubber pad shock absorption fluidized bed type ion exchange water treatment device is characterized in that repetitive conical funnel sieve surfaces and wide-brimmed hat-shaped sieve surfaces in a tower body form a plurality of layers of supporting discs for resin dispersion, vibration is transmitted by using water as a medium carrier to realize layer-by-layer falling and dispersion of resin, central falling pipes complete transfer of the resin from the conical funnel sieve surfaces to the wide-brimmed hat-shaped sieve surfaces, elastic ring pieces on the edges of the wide-brimmed hat-shaped sieve surfaces can realize micro-pressure opening to allow the resin to be transferred to a next conical funnel sieve surface, and the resin is repetitively diffused layer by layer, falls down and finally is transferred and conveyed to a next working step through a pump and a Venturi injection and absorption device at a tower bottom. The repetitive conical funnel sieve surfaces and the wide-brimmed hat-shaped sieve surfaces in the tower body can realize smooth resin falling and resin circulation by fully utilizing buoyancy, vibration and inclination angles, thereby the effects of long time of contact between the resin and a liquid phase, full ion exchange, no channeling and no dead corner are realized, the automatic continuous operation is realized under the condition of high-efficiency and uniform countercurrent mass transfer, and the application value is important.