13 results about "Resonance damping" patented technology

The invention relates to the technical field of ultra-high-speed motor design, fluid mechanical engineering and electromagnetic-structure coupling, in particular to an innovative structure-electromagnetic coupling design of a centrifugal hydrogen circulating pump driven by an ultra-high-speed permanent magnet motor. The integrated coupling rotor system is formed by rigidly connecting a permanent magnet motor rotor and a centrifugal impeller through conical surface interference and key groove positioning, a rotor iron core is formed by laminating 0.2 mm ultrathin silicon steel sheets (35W250), and impeller blade molded lines are optimized based on electromagnetic force harmonic characteristics (the number of blades is equal to the number of motor poles + / -1); the coupling matching degree is remarkably improved: through structure-electromagnetic parameter collaborative optimization, the comprehensive efficiency of the system reaches 85% or above, and is improved by 12%-15% compared with that of a separation design; an anti-resonance damping module is combined with a frequency avoidance design, and the vibration acceleration in an ultra-high-speed interval is smaller than or equal to 8 g and is reduced by 60% or above compared with a traditional design; the torque-load matching time is less than or equal to 0.3 s when the flow is suddenly changed, overcurrent impact or surge is avoided, and the dynamic requirement of a fuel cell system is met.

The application discloses a kind of regulation and control method and device of broadband resonance damping characteristics, the method includes that target node in electric power system is sampled to broadband signal, target voltage instantaneous distortion and target current cumulative deviation are obtained, to calculate energy transmission delay factor and energy balance correction factor;According to energy transmission delay factor and energy balance correction factor, calculate local damping dynamic coefficient and control accuracy real-time error, to optimize target voltage instantaneous distortion and target current cumulative deviation;According to the target voltage instantaneous distortion and target current cumulative deviation after optimization, and local damping dynamic coefficient updates power flow distribution proportion, to improve the voltage stability of target node.Can be through energy transmission delay factor and balance correction factor quantitative analysis the transient characteristics of energy change of electric field and magnetic field;According to the transient characteristics in combination with the real-time running state of electric power system, regulate and control broadband resonance damping characteristics, to improve the stability of electric power system.

A horseshoe shaping apparatus is provided. The horseshoe shaping apparatus includes a block having a plurality of cradles extending from a front end, with each cradle being able to support and shape a horseshoe upon impact from a hammer. Adjacent cradles include a shoulder forming a step therebetween. A pair of turning cams extend from the rear end of the block, providing additional positioning options for shaping the horseshoe. A cradle aperture disposed through the block facilitates secure placement of horseshoes for dimensional modification. The apparatus further includes a rebound suppression base to stabilize the block during use and reduce vibration, enhancing shaping precision. Grip recesses on the lower side of the block improve handling, while the integration of resonance-dampening materials minimizes rebound.

The application discloses a kind of deep sea FPSO moon pool fluid resonance damping equipment and method, comprising the following steps: step one, assess the geometric structure of deep sea FPSO moon pool and its fluid dynamics characteristics, the geometric structure includes the size and shape of moon pool, the fluid dynamics characteristics include the flow rate and direction of fluid in a set period, adopt three-dimensional fluid dynamics simulation technique, calculate the resonance frequency of fluid in moon pool based on the geometric structure and fluid dynamics characteristics;Step two, based on the fluid dynamics data sample obtained by evaluation, design the layout and configuration scheme of damping equipment, the damping equipment includes at least three damping units. By accurately evaluating the geometric structure of moon pool and fluid dynamic characteristics, and using suitable damping equipment, the fluid resonance in the moon pool can be effectively reduced, thereby improving the structural stability and safety of FPSO. Reducing resonance phenomenon helps to prevent structural fatigue and prolong the service life of FPSO.

The invention discloses a road noise peak value optimization method and optimization device of a vehicle and electronic equipment, and relates to the technical field of vehicles. The method comprises the following steps: constructing a whole vehicle finite element model, and obtaining road noise information based on the whole vehicle finite element model; determining problem frequency according to the road noise information; performing road noise problem diagnosis on the problem frequency to determine a position to be optimized; setting a local resonance damping structure based on the to-be-optimized position; and controlling the whole vehicle finite element model to operate to obtain optimized road noise information, and determining an optimization result based on the optimized road noise information and the road noise information. Therefore, according to the method, the to-be-optimized position of the vehicle body plate is determined by constructing the whole vehicle finite element model, calculating the road noise and carrying out problem diagnosis on the noise of the problem frequency, the local resonance damping structure is arranged at the to-be-optimized position, and vibration of the local plate is restrained, so that the peak value of the road noise is reduced, and the comfort experience of a driver and passengers is improved; and the vehicle optimization cost is reduced.

The invention discloses industrial mechanical arm vibration reduction equipment based on adjustable local resonance vibration reduction units, and relates to the technical field of vibration suppression or attenuation devices, the industrial mechanical arm vibration reduction equipment comprises a mechanical arm connecting rod, a plurality of vibrator rings are arranged on the outer side of the mechanical arm connecting rod at equal intervals, and a plurality of two-stage flexible structures are arranged between the vibrator rings and the mechanical arm connecting rod at equal angles; the two-stage flexible structure is adhered to the outer surface of the mechanical arm connecting rod and is connected with the vibrator ring through the adjusting shaft; the invention further provides a using method of the industrial mechanical arm vibration reduction equipment based on the adjustable local resonance vibration reduction unit. The using method comprises the steps that firstly, a simplified model is constructed, and equivalent parameters are obtained; 2, calculating a band gap of a local resonance unit cell structure by using a transfer matrix method; a local resonance structure is additionally arranged on the industrial mechanical arm instead of the tail end of the mechanical arm, and vibration suppression of a mechanical arm body in a specific frequency range is achieved.

The invention belongs to the technical field of servo rotary tables, and particularly relates to a low-noise servo rotary table and a design implementation method thereof. The combined lubricating structure design and the gear body resonance damping structure design are adopted, and the good popularization significance is achieved for the noise reduction design of a new transmission system. The combined lubricating structural design adopted by the device has an innovative structural design mode, the gear body resonance damping structural design is innovative, a numerical simulation noise reduction design method is combined, transmission system noise reduction design is carried out, the transmission design noise reduction advantage and effect are obvious, and it is proved through noise detection and corresponding ablation tests that the noise reduction effect is good. The noise optimization of the gear body resonance damping model design can reach-2dBA to-3dBA, and the noise optimization of the oil immersion lubrication damping model design can reach-4dBA to-5dBA. When the method is used for noise reduction design of the transmission system, the noise reduction effect is obvious, design parameters of a gear body resonance damping model and design parameters of an oil immersion lubrication damping model are corrected through multiple sets of sample test data, and noise reduction design theoretical numerical values and actually measured numerical values have more guiding significance.

The invention discloses a rail transit steel rail damper capable of restraining multi-order frequency, and belongs to the technical field of rail transit vibration and noise reduction, the rail transit steel rail damper comprises two constraint damping assemblies and a resonance damping assembly, each constraint damping assembly comprises a constraint plate and an elastic damping layer attached to the rail web of a steel rail, the constraint plate is embedded in the top of the elastic damping layer, and the resonance damping assembly is embedded in the elastic damping layer. The inner side of the elastic damping layer is of an arc-shaped structure matched with the rail web of the steel rail, and the resonance damping assembly comprises a mass plate, a first elastic layer, a middle plate, a second elastic layer and an upper cover plate which are sequentially connected from bottom to top. By restraining the damping assembly, the shearing area of the damping layer parallel to the longitudinal section of the steel rail is increased, the shearing effect of the damping layer is enhanced through overall vertical deformation of the steel rail, the vibration and noise reduction effect is further improved, and different elastic systems are formed through the mass plate, the first elastic layer, the middle plate, the second elastic layer and the upper cover plate; tuning with different frequencies of the steel rail can be realized, and vibration is inhibited.

The present application relates to a kind of machine tool flexible ball screw system decoupling control method, first to the speed inner ring transfer function is decoupled, obtain the flexible modal item in system;Based on flexible modal item design shaping controller, the parameter of shaping controller is only determined by the anti-resonance frequency of system and anti-resonance damping ratio;Speed inner ring closed loop dynamic shaping is target second-order system, so that resonance suppression and bandwidth adjustment are realized independently by PI controller.In this way, the transfer function of position outer ring is decoupled, separates out the first order component of high-order flexible mode, and designs additional controller based on position difference feedback, the feedback gain is equal to the proportional gain size of P controller in position outer ring, and the sign is opposite, suppress the influence of the first order component of high-order flexible mode.The present application realizes the decoupling of shaping controller and P-PI controller parameter setting, simplifies parameter setting process, and improves the closed-loop bandwidth and industrial practicability of flexible ball screw feeding system.

This application relates to the field of electrified railway construction, and in particular to an anti-resonance damping structure for an AF line suspension column. The structure includes a column body, a reference plate at the top of the column body, two first support plates fixedly connected to the upper surface of the reference plate, and a second support plate rotatably connected to each first support plate. A support plate is positioned above the reference plate, and two drive frames are mounted on the lower surface of the support plate. Two first support rods are rotatably connected to both ends of each drive frame. This invention, through the arrangement of the support plate and drive frames, and the cooperative relationship between them, allows the column body to transmit vibrations to the drive frames via the reference plate and first support rods. This causes the drive frames to extend and retract the damping rods, thereby mitigating and absorbing the vibrations experienced by the column body, thus achieving the anti-resonance effect of the support plate and drive frames described in this application.

The invention discloses a high-vibration-attenuation damping type numerical control lathe cutter bar, and relates to the technical field of numerical control lathe cutters. The cutter bar comprises a cutter bar main body, a cutter head and a tail resonance damping assembly; the cutter bar main body is provided with a front end strengthening section, a conical surface interference centering section, a connecting thread, a main damping cavity and a pre-tightening device; two stages of damping blocks are arranged in the main damping cavity, and the tool bit and the tail part are respectively provided with a matched damping structure to jointly form a three-stage broadband vibration reduction system. Through three-stage damping synergistic vibration reduction, double positioning connection and bidirectional adjustable pre-tightening, the rigidity and stability of the cutter bar under the long overhanging working condition are improved, vibration can be effectively restrained within the range of 6-7 times of diameter overhanging, the single-side cutting depth of 1-3 mm and the rotating speed of 280-580 r / min, the machining precision is improved, the structure is reliable, adaptability is high, and the long overhanging cutter bar is suitable for long overhanging stable cutting of a numerical control lathe.

The invention discloses a boarding bridge, and relates to the technical field of boarding bridges. A damper base is fixedly connected to the upper portion of the frame, a plurality of hydraulic buffer rods and a middle supporting frame are rotationally connected to the upper portion of the damper base through universal joints, a top support is fixedly connected to the tops of the hydraulic buffer rods, a plurality of U-shaped water tanks are fixedly connected to the two sides of the middle supporting frame, and water is stored in the U-shaped water tanks. A water inlet is fixedly connected to the upper portion of the U-shaped water tank, a water outlet is fixedly connected to the lower portion of the U-shaped water tank, cooling water jackets are fixedly connected to the upper portions of the multiple hydraulic buffer rods, and water distribution pipes are fixedly connected to the two sides of the multiple cooling water jackets. A resonance damping system is formed through cooperation of the U-shaped water tank and the hydraulic buffer rod, a tuned liquid damper is formed when water in the U-shaped water tank shakes, and the vibration reduction effect is enhanced; meanwhile, circulating cooling water of the water supply assembly cools the hydraulic buffer rod through the cooling water jacket, and the buffer performance of the hydraulic buffer rod is kept stable. By means of the design, the dual functions of vibration reduction and cooling are achieved.

The invention relates to a decoupling control method for a flexible ball screw system of a machine tool, and the method comprises the steps: firstly carrying out the structural decoupling of a speed inner ring transfer function, and obtaining a flexible modal term in the system; designing a shaping controller based on the flexible modal item, wherein the parameters of the shaping controller are only determined by the anti-resonance frequency and the anti-resonance damping ratio of the system; a closed loop of a speed inner loop is dynamically shaped into a target second-order system, so that resonance suppression and bandwidth adjustment are independently realized through a PI controller. On the basis, structural decoupling is carried out on a position outer ring transfer function, a high-order flexible mode first-order component is separated, an additional controller based on position difference feedback is designed, the feedback gain of the additional controller and the proportional gain of a P controller in a position outer ring are equal in size and opposite in sign, and the influence of the high-order flexible mode first-order component is restrained. According to the method, decoupling of parameter setting of the shaping controller and the P-PI controller is achieved, the parameter setting process is simplified, and the closed-loop bandwidth and industrial practicability of the flexible ball screw feeding system are improved.