8 results about "Resonance damping" patented technology

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 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 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 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.