21 results about "Balancing vibrations" patented technology

The invention provides a vehicle over-limit type detection method and system based on wagon balance vibration and point cloud data, relates to the technical field of intelligent traffic detection, and aims to solve the problems that in the prior art, misclassification is caused by dependence on single data, the over-limit types of a whole loading vehicle and a bulk vehicle are difficult to effectively distinguish, an over-limit management strategy is lack of pertinence and effectiveness, and the detection accuracy is poor. And real vibration characteristics and the like generated in the lockage process of the vehicle are difficult to accurately separate. According to the method, a wagon balance vibration signal and original vehicle point cloud data are obtained, processing and feature extraction are carried out, vibration features and point cloud geometric features are fused through an SVM classifier, a vehicle type and a loading state are obtained, and judgment is carried out based on a result. According to the method, the problems existing in the prior art are solved, misclassification caused by traditional single data detection is effectively avoided, the overrun types of the whole loading vehicle and the bulk vehicle can be effectively distinguished, high robustness can be still kept in an extreme environment, and misjudgment and missing detection are reduced.

The invention relates to the technical field of motor control, and discloses a bearingless composite rotor cage type asynchronous motor vibration real-time compensation control method, which comprises the following steps: acquiring and preprocessing a rotor displacement signal to obtain a filtered displacement signal; processing the filtered displacement signal based on a second-order generalized integrator, and extracting a fundamental frequency harmonic component synchronous with the mechanical angular velocity of the rotor; adopting a simplified LMS algorithm to dynamically optimize the amplitude weight and the phase weight of the compensation force, and generating a feedforward compensation force according to the optimized weights; a two-channel control framework is constructed, and total control force is synthesized; the suspension force winding is driven by the inverter to generate corresponding radial suspension force, so that unbalance vibration of the rotor is counteracted; according to the invention, the second-order generalized integrator harmonic observer is adopted to realize high-precision extraction of the fundamental frequency component, and the mechanical angular velocity change of the rotor can be tracked in real time in cooperation with a frequency adaptive adjustment mechanism.

The invention discloses a high-speed rotor dynamic balance and vibration characteristic measuring device and method, and belongs to the technical field of rotor high-speed rotation characteristic monitoring. The device comprises a to-be-tested rotor, a bearing, a housing and a housing support. The shell is provided with a rotating speed sensor and displacement sensors; the displacement sensors are arranged in the middle and two ends of the main shaft; a shell bracket is arranged at the lower part of the shell; the vibration sensor is mounted on the shell bracket in a coupling manner; the laser distance measuring sensors are coaxially mounted on the outer sides of the working wheel and the brake wheel respectively; and the vibration sensor, the rotating speed sensor, the displacement sensor and the laser distance measuring sensor are respectively in signal connection with the data acquisition and signal processing system through sensor wires. According to the invention, a plurality of sensors such as the rotating speed sensor, the displacement sensor, the vibration sensor and the laser distance measuring sensor are coupled, so that vibration characteristics such as dynamic balance, vibration form and axis track of the rotor at a high rotating speed can be obtained at the same time through the measuring device.

This invention discloses a method for graded early warning and active control of vibration and noise in automotive permanent magnet synchronous motors, belonging to the field of motor prediction and control. This method inputs real-time motor operating parameters and historical NVH time-series data into a pre-trained neural network prediction model to obtain stator vibration acceleration distribution images and sound pressure distribution images at future moments. Based on the prediction results and preset thresholds, the risk level is determined and graded early warnings are triggered. Based on the early warning level, an improved particle swarm optimization algorithm is used to solve for the optimal adjustment increment of the id / iq current, and the motor is dynamically adjusted through a current loop to achieve active suppression of vibration and noise. This invention can achieve advanced prediction and graded early warning of vibration and noise, forming a closed loop of "prediction-decision-control," achieving high-precision prediction with small sample sizes, balancing vibration and noise suppression with motor operating safety, and improving motor operation smoothness and reliability.

The invention discloses a transmission conductor damping device and method, and the device comprises a fixed part which is disposed on a transmission conductor; the rotating part is arranged outside the fixed part in a sleeving manner and is rotationally connected with the fixed part; the driving part is rotationally arranged at the end, away from the power transmission line, of the fixing part; the limiting part is arranged on the driving part; the telescopic rotating part is arranged on the driving part, the telescopic rotating part is separated from limiting of the limiting part in the plumb bob direction under the action of wind power and rotates to droop, so that the telescopic rotating part abuts against the rotating part to drive the rotating part to rotate, and then the rotating part generates upward acting force to balance vibration force; and the telescopic rotating piece is separated from the rotating part. The telescopic rotating part drives the rotating part to rotate to generate upward acting force by utilizing vertically downward vibration force of the power transmission conductor, so that the vibration force of the conductor is balanced, and the vibration of the conductor in the vertical direction can be effectively inhibited.

The application discloses a shaftless silent pump with an integrated rotor, which comprises a primary volute assembly, a front bearing assembly, a stator component, a double-stage rotor component, a secondary volute assembly and a rear bearing assembly. The stator component is composed of a stator shell, a stator core and front and rear flanges; the rotor component is composed of a rotor core, primary and secondary impellers and a rotor core pressing plate into an integrated structure, the primary and secondary impellers are arranged back to back on both sides of the motor, and the front and rear bearing assemblies are respectively located on the inlet sides of the primary and secondary impellers and are installed in the primary and secondary volutes. The integrated structure of the two-stage impellers back to back and the rotor core effectively improves the overall rigidity and dynamic balance of the rotor, the front and rear bearings are respectively designed on the inlet sides of the two-stage impellers, which facilitates the overall assembly and disassembly of the pump, the lengthened impeller inlet section and the increased bearing design play different roles in the pump inlet flow state, the balance of axial force and vibration noise, and the silent effect of the product is realized.

The present application belongs to the technical field of correction device, disclose a kind of gear box balancing correction device, rotating shaft is rigidly connected with sleeve in gear box, base is matched with sleeve air gap and installs excitation coil stator, double cup mouth opposite flexible gear is engaged by rigid gear ring in sleeve, eccentric block is arranged in flexible gear cup bottom, internal wave generator, wave generator is connected with rotating shaft by bearing and integrated energy transmission cylinder, and magnetic hysteresis rotor is arranged in the end of energy transmission cylinder;When working, double excitation coil stator independently generates rotating magnetic field, and independently angular deflection of wave generator is driven through air gap coupling, and the included angle of eccentric block is adjusted and controlled to synthesize reverse compensation centrifugal force to offset unbalanced vibration;Device structure is compact, control is accurate, transmission is stable, non-contact transmission improves high-speed reliability, solves the problem of redundant structure and insufficient precision of traditional device.

The present invention discloses a vibration reduction and balancing device based on a harvesting drone, comprising a drone, a landing gear, a harvesting mechanism, a balancing mechanism, an active vibration reduction mechanism, and a passive vibration reduction mechanism; the passive vibration reduction mechanism comprises a balancing vibration reduction support plate and a passive vibration reduction assembly arranged on the landing gear; the harvesting mechanism comprises a harvesting rod, a shearing clamping mechanism, and a shearing clamping drive mechanism; the active vibration reduction mechanism comprises a vibration reduction controller, a first vibration damper, a second vibration damper, and a posture sensor; the balancing mechanism comprises a guide frame arranged on the balancing vibration reduction support plate, a counterweight block slidably arranged on the guide frame, and a balancing drive mechanism arranged on the balancing vibration reduction support plate. During harvesting, the device can prevent the drone's center of gravity from shifting, causing the drone to lose balance, and can also reduce the vibration generated by the drone, thereby reducing shaking during the harvesting process and ensuring the stability of the harvest.

The present invention discloses a method and system for suppressing unbalanced vibration of a magnetic bearing, belonging to the technical field of active control of magnetic bearings. During static suspension, self-learning is first performed, and X-axis and Y-axis position angle instructions of different frequencies that change according to the sine and cosine laws are injected to obtain X-axis and Y-axis position responses of corresponding frequencies within the full speed range, thereby obtaining transfer functions containing phase angle and amplitude information under different frequency bands; when the rotor rotates at high speed, the position responses of the X-axis and Y-axis are measured in real time, and their running trajectories are described in a vector representation manner, and the current rotational angular velocity is calculated in real time; a feedforward current is constructed and injected through the transfer function and the rotational angular velocity calculated in real time, and a disturbance suppression coefficient is introduced at the same time to achieve different degrees of unbalanced vibration suppression. This method is applicable to the movement of bearing rotors at high speeds, can smoothly cross the critical speed, and achieve effective suppression of unbalanced vibration.

The invention provides a vibration isolation and buffering integrated helicopter anti-crash seat based on a magneto-rheological technology, which comprises a seat body, a seat supporting system and a magneto-rheological damping system, the magneto-rheological damping system comprises a magneto-rheological damper mounted on the seat body and a transmission part arranged on the seat supporting system, the transmission part is provided with a first transmission part and a second transmission part, and the magnetorheological damper is provided with a first power input part used for being in transmission fit with the first transmission part and a second power input part used for being in transmission fit with the second transmission part. The magnetorheological damping system is suitable for multiple working condition scenes, the vibration isolation requirement of daily use is met, the energy absorption protection capacity during crash is also achieved, working condition switching is achieved by inputting different currents into the magnetorheological damping system and the number of the racks intervened under different working conditions, and the working condition switching efficiency is improved. The magneto-rheological damping system achieves a wide dynamic mechanical range under the limited weight and space so as to give consideration to vibration isolation under the common working condition and energy consumption under the crash working condition.

The invention discloses a turbofan engine fan unbalanced vibration fault self-healing regulation and control system and method. The turbofan engine fan unbalanced vibration fault self-healing regulation and control system comprises an online monitoring and diagnosis system, an intelligent control system and an unbalanced vibration self-healing regulation and control actuator which are in communication connection in sequence. The on-line monitoring and diagnosis system is used for carrying out real-time acquisition and characteristic analysis on vibration signals of a fan rotor of the turbofan engine so as to obtain the occurrence position of an unbalance fault; the intelligent control system is used for generating an optimal control instruction according to a diagnosis result of the online monitoring and diagnosis system based on a nonlinear active-disturbance-rejection control algorithm; the unbalanced vibration self-healing regulation and control actuator is installed on a fan rotor of the turbofan engine and used for receiving a control instruction of the intelligent control system and executing physical actions so as to adjust mass distribution of a fan rotor system in real time to achieve dynamic balance. The problem of poor timeliness existing in unbalanced vibration fault elimination is solved.

This invention relates to a pipeline elastic vibration damping support and its construction method, belonging to the field of pipeline vibration reduction technology. The pipeline elastic vibration damping support of this invention includes a load-bearing rod, two suspension rods, a pipeline support plate, and a spring damper. The upper ends of the two suspension rods are connected to the load-bearing rod, and the lower ends are fixedly connected to the pipeline support plate. The spring damper includes a base plate, an upper plate, two fixing bolts connecting the base plate and the upper plate, a lower spring assembly, an upper spring assembly, two connecting bolts, an upper clamping bolt, a lower clamping bolt, and an adjusting bolt. The pipeline support plate is clamped between the lower spring assembly and the upper spring assembly. This invention can balance vibration reduction and structural safety, and the spring damper structure of this invention can fix the pipeline support plate, enabling the suspension support to be smoothly installed while ensuring both vibration reduction effect and safety.

The invention discloses a CMG rotor unbalanced vibration self-compensation system based on force feedback, and belongs to the technical field of spacecraft attitude control. The system comprises a CMG unit which comprises a high-speed rotor, a rotor motor, a frame, a frame motor and a base; the excitation compensation unit is used for constructing an excitation signal with the same frequency as the rotating speed of a rotor and applying the excitation signal to a current loop input end of the frame servo control unit; the force characterization unit is used for calculating corresponding vibration characterization results of the CMG unit when the CMG unit is subjected to different excitation signals; the optimal compensation force resolving unit is used for calculating the optimal compensation amplitude of the unbalanced disturbance force according to the vibration characterization result, and transmitting the result to the excitation compensation unit to generate a compensation signal; and the frame servo control unit is used for driving the frame motor to rotate according to the excitation signal and performing rotation compensation on the frame motor according to the compensation signal. Transmission of unbalanced vibration force of the CMG high-speed rotor can be effectively reduced.

The invention discloses a rotor unbalance vibration reduction method based on oil film partition control, and relates to the field of high-speed flexible rotor vibration control, the vibration reduction method comprises the following steps: firstly detecting the vibration response and the rotating speed of a rotor system, and determining the eccentricity ratio and the precession angle of a rotor in an integrated squeeze film damper ISFD, and each squeeze film area; then analyzing the influence of the radial displacement of the oil film adjusting tiles in different oil film areas on the ISFD oil film force, and establishing a database of the radial displacement of the different oil film adjusting tiles and the ISFD oil film force; if the detected rotor vibration response is higher than the rotor target response, oil film force is adopted to suppress the rotor vibration response, and then the target radial displacement of each oil film adjusting tile is determined; and the radial movement of the oil film adjusting tiles is pushed, so that the actual radial displacement of each oil film adjusting tile is close to the target radial displacement, and the unbalanced vibration of the rotor is reduced. According to the vibration reduction method disclosed by the invention, the oil film force of the ISFD is actively changed, and the unbalanced vibration response of the rotor is rapidly inhibited.

The present invention relates to an unbalance vibration generator (1) comprising two electric motors (6, 6.1, 6.2), each with a stator (10) and a rotor (11) rotatable about an axis of rotation (12), and two unbalance masses (7, 7.1, 7.2). The electric motors (6, 6.1, 6.2) are arranged coaxially with respect to their axes of rotation (12). The unbalance masses (7, 7.1, 7.2) are each attached to one of the rotors (11) and are rotatable together with the respective rotor (11) about the respective axis of rotation (12). The unbalance masses (7, 7.1, 7.2) are at least partially rotatable in a common plane (17) about the coaxial axes of rotation (12).

The application relates to the technical field of motor control and discloses a bearing-free composite rotor cage-type asynchronous motor vibration real-time compensation control method, which comprises the following steps: collecting a rotor displacement signal and pre-processing the same to obtain a filtered displacement signal; processing the filtered displacement signal based on a second-order generalized integrator to extract a fundamental harmonic component synchronized with a rotor mechanical angular velocity; dynamically optimizing the amplitude weight and the phase weight of a compensation force by adopting a simplified LMS algorithm, and generating a feedforward compensation force according to the optimized weight; constructing a double-channel control framework to synthesize a total control force; and generating corresponding radial suspension forces by driving a suspension force winding through an inverter, so that the unbalanced vibration of the rotor is counteracted; the second-order generalized integrator harmonic observer is adopted to realize high-precision extraction of the fundamental frequency component, and a frequency self-adaptive adjustment mechanism is matched, so that the rotor mechanical angular velocity change can be tracked in real time.

The utility model discloses a shredded konjac lifting and conveying mechanism which comprises a support and is characterized in that an obliquely-arranged net chain conveying belt is arranged on the support, mounting frames are arranged on the left side and the right side of the net chain conveying belt respectively, the mounting frames are fixed to the support, and the front end and the rear end of the net chain conveying belt are wound around a front roller and a rear roller respectively. The front roller and the rear roller are rotatably arranged in the mounting frames, a motor is arranged right above the inclined high end of the net chain conveying belt, the motor is arranged on a mounting seat, the mounting seat is fixed on a portal frame, the portal frame is fixed on the mounting frames on the two sides, and the motor is in transmission connection with the front roller. According to the utility model, the lifting and conveying of the konjac shreds are realized, the draining is completed in the conveying process, the motor position is reasonably arranged, the vibration is balanced, and the influence on the conveying is reduced.

The utility model relates to the technical field of heat radiators, and discloses a jig applied to a balance vibration test of a heat radiation fan, which comprises a working table, a test mechanism is arranged on the surface of the working table, the test mechanism comprises a laser probe and a vibration disc, and the vibration disc is fixedly arranged on the surface of the working table. According to the jig applied to the balance vibration test of the cooling fan, due to the arrangement of the first shaft rod and the second shaft rod, the inclination angle of the jig can be adjusted at will, due to the arrangement of the rotating block, the testing direction can be adjusted at will, the vibration sensor is installed at the top end of the testing mechanism, and therefore the testing range of the jig can be adjusted at will; when the testing mechanism is in contact with the axis of a fan blade, the vibration of the central position of the fan can be tested, and when the testing mechanism is in contact with the fixed frame, the peripheral vibration data of the whole fan can be collected, in conclusion, due to the flexible arrangement of the testing mechanism, the testing range of the whole device for the cooling fan is enlarged, and the testing efficiency is greatly improved.

The utility model discloses a spiral adjusting seat device, which is arranged on the left side of the lower part of a vibration source and the right side of the lower part of a trough, comprises a main frame, a base, a pin shaft, a screw rod and a lifting sleeve, and is of a sealed structure, the pin shaft small bevel gear and the screw rod large bevel gear which are used for motion conversion, the copper nut and the lifting sleeve are arranged and installed in a cavity formed by the main frame and the base, the pin is rotated to drive the small bevel gear and the large bevel gear to be meshed and drive the copper nut and the screw rod to be in threaded fit, and rotation motion is converted into vertical up-and-down motion of the lifting sleeve. The angle of the vibration feeder is further adjusted through lifting of the top cover; meanwhile, a locking structure is arranged and matched with a locking nut and a cotter pin to lock the pin shaft, and reverse rotation is prevented; the damping structure is arranged, and the symmetrical supporting stand columns and damping springs are arranged between the main frame and the top cover, so that the damping and vibration balancing effects are achieved. All rotating parts of the spiral adjusting seat device are arranged in the base and the main frame, so that the spiral adjusting seat device is reliable to use; the torque is transmitted through the two bevel gears, and labor is saved during adjustment. Meanwhile, the height is directly adjusted by rotating the pin shaft, the vibration feeder does not need to be hoisted or supported, and convenience and flexibility are achieved.

The invention discloses a radial foil bearing with composite waveform foils, and belongs to the technical field of air foil bearings. The bearing comprises a bearing seat, a wave-shaped foil and a top-layer foil. The two ends of the wave-shaped foil are clamped in the axial clamping grooves of the bearing seat through the strip-shaped protrusions to be fixed, the middle portion of the wave-shaped foil makes contact with the inner wall of the bearing seat through the opposite horizontal sections, and the top-layer foil is supported through the wave-shaped protrusion sections. The first semi-arc length section and the second semi-arc length section at the two ends of the wave-shaped protruding section are connected through a suspended small wave band, damping can be introduced into the small wave band, and the vibration difference, caused by fixed constraint, between the two half waves of the connecting fixed end and the connecting bearing seat is balanced. Meanwhile, the top-layer foil is fixed in the clamping grooves through the strip-shaped protrusions of the top-layer foil. Through the symmetrical full-fixed structure, the bearing can adapt to positive and negative rotation of a main shaft, axial displacement of the top foil is effectively restrained, vibration and loads are balanced through small bands, the operation stability and bearing capacity of the bearing are remarkably improved, and the service life of the bearing is remarkably prolonged.

The utility model discloses a connecting rod assembly and a diaphragm compressor, and relates to the technical field of compressors. The connecting rod assembly comprises an eccentric wheel and a connecting rod body, the eccentric wheel is used for being connected to a motor shaft of the diaphragm compressor and enabling the motor shaft to drive the eccentric wheel to rotate, one end of the connecting rod body is connected to the eccentric wheel, and the other end of the connecting rod body is used for being connected to a diaphragm of the diaphragm compressor and driving the diaphragm to reciprocate in the extending direction of the connecting rod body. The connecting rod body comprises the first connecting rod and the second connecting rod, the eccentric wheel is connected with the first connecting rod and the second connecting rod, and the first connecting rod and the second connecting rod are symmetrically arranged along the eccentric wheel, so that the first connecting rod and the second connecting rod can oppositely impact to balance vibration, vibration generated during operation of the diaphragm compressor is reduced, and the vibration balance effect is improved; modeling data, a large amount of analog calculation and simulation verification are not needed, and a large amount of labor cost of designers and assemblers is saved.