42results about How to "Avoid torsional vibration" patented technology

The invention belongs to the technical field of structure vibration reduction, and particularly relates to a vertical tuning mass damper. The damper comprises a guide rod, a mass block and an elasticpart, the guide rod is vertically arranged, and the mass block slidingly sleeves the guide rod; a fixed end of the elastic part is relatively fixed to a main structure body, and a free end is connected with the mass block. The vertical tuning mass damper aims at solving the problem that an existing vertical tuning mass damper is not good in vibration reduction effect. The mass block of the vertical tuning mass damper is not twisted in the vertical direction, and the vertical vibration effect of a control mode is better. According to the vertical tuning mass damper, the guide rod is verticallyarranged, the movement direction of the mass block is limited in the vertical direction, and torsional vibration of the damper is prevented, so that the vertical vibration prevention effect of the main structure body such as bridges is more remarkable.

The invention relates to a topology structure of a machine-side converter of a permanent magnet direct-drive type wind generator and a control method, belonging to the technical field of wind power generation. The topology structure comprises a Vienna rectifier, a DC / DC boost converter, one end of the Vienna rectifier is connected with a stator of a permanent magnet direct-drive wind generator, and the other end of the Vienna rectifier is connected with a DC / DC boost converter. The other end of the DC / DC boost converter is connected to the DC bus. The control method is as follows: the Vienna rectifier adopts zero-sequence component injection method to realize harmonic minimization of generator; the DC / DC boost convert realizes boost and maximum power point tracking control of wind turbines. The invention overcomes the defect of high spike voltage pulse inherent in the traditional voltage source converter, reduces the insulation requirement of the generator stator, simplifies the manufacturing process of the generator and reduces the cost. Small current harmonics avoid additional mechanical vibration and torsional vibration phenomenon, switching devices withstand low voltage, and the structure and the method are especially suitable for high voltage, and high power applications.

A mechanical rotational drive has a bar-like torsion element, whereby the torsion element is firmly clamped with a first end in a bearing device. The torsion element can be pivoted with a second free end with respect to the clamped end about the longitudinal axis, forming a rotation axis, of the torsion element between a relaxed position and a tensioned position, whereby the length of the torsion element is reduced with respect to the relaxed position when the torsion element is brought into its tensioned position. A device for transmitting a torque into the torsion element or out of the torsion element is provided in the area of the free end, and a damping device is arranged in the axial direction of the torsion element at a fixed distance from the bearing device and adjacent to the free end of the torsion element, and a damping part is provided on the torsion element in the area of the free end of the torsion element, which damping part in the relaxed position is in friction engagement with the damping device and which in the tensioned position is not engaged with the damping device.

A flywheel apparatus of an engine may include a primary wheel that receives a rotational force from the engine and has an integral ring gear, a secondary wheel that has a sun gear disposed coaxially with the ring gear, a carrier to which each rotary shaft of a plurality of planetary gears may be connected, the planetary gears being engaged between the integral ring gear and the sun gear, and a damping member elastically engaging between the carrier and the secondary wheel and providing an elastic force to the carrier during relative rotation between the carrier and the secondary wheel.

The invention discloses a forced stable control method for torsional vibration of a permanent magnet direct-drive driving shaft system. The method comprises the following specific steps: S1, determining an electromechanical coupling dynamic model of a system driving shaft system under the direct drive of a low-speed large-torque permanent magnet motor 1; S2, constructing a system full-state feedback regulator; S3, constructing a system input delay shaper; S4, integrating the system full-state feedback regulator and the system input delay shaper to construct a system torsional vibration forcedstable controller; S5, adjusting the control parameters of the system torsional vibration forced stable controller according to a numerical simulation result. After the steps, the design is finished.By adopting the forced stable control method, torsional vibration of the driving shaft system is avoided from the source, the robustness of the conventional closed loop controller can be enhanced remarkably, the aim of effectively suppressing the torsional vibration of the driving shaft system is fulfilled, and safe and reliable application of the low-speed large-torque permanent magnet motor in the field of direct drive is ensured.

A polishing apparatus which can continue stable operation of the apparatus without generating torsional vibration in a rotary joint and without generating an abnormal sound at an engagement part between a cooling water pipe and a polishing table is disclosed. The polishing apparatus includes a rotary joint fixed to a rotating part of the polishing table or a rotating part of the top ring to supply a fluid into the polishing table or the top ring and discharge the fluid from the polishing table or the top ring, and a rotation-prevention mechanism which connects the rotary joint with an apparatus frame to prevent the rotary joint from being rotated. The rotation-prevention mechanism includes a link mechanism having at least one spherical plain bearing.

The invention relates to a device, method and mobile charging vehicle for suppressing torsional vibration. The device includes: a power generation module, a control module and a charging module connected to each other; wherein, the power generation module is used to generate electric energy; the control module is used to connect to the The vehicle calculates the charging power according to the charging request power of the charged vehicle and the target allowable power parameters of the mobile charging vehicle; the charging module is used to connect to the charged vehicle and charge the charged vehicle according to the charging power to suppress the torsional vibration of the power generation module . By limiting the charging power of the mobile charging car, the present invention avoids the charging power that is likely to cause torsional vibration of the transmission device, thereby reducing the problem of charging car failure caused by the torsional vibration of the transmission device, and at the same time reducing the vibration of the vehicle. It also reduces noise and improves fuel efficiency.

The present invention provides a torsional vibration-resistant coupling structure and a torsional-vibration-resistant hollow rotor structure. The torsional vibration-resistant coupling structure includes a first coupling piece, a second coupling piece, and an elastic piece capable of transmitting torque for respectively coupling different shafts. The elastic element is connected between the first coupling element and the second coupling element. The present invention can suppress torsional vibration, prevent torsional vibration from the coupling of the shaft system or the single shaft itself, and ensure the stability of the shaft system and single rotating shaft.

The invention discloses a forced stable control method for torsional vibration of a permanent magnet direct-drive driving shaft system. The method comprises the following specific steps: S1, determining an electromechanical coupling dynamic model of a system driving shaft system under the direct drive of a low-speed large-torque permanent magnet motor 1; S2, constructing a system full-state feedback regulator; S3, constructing a system input delay shaper; S4, integrating the system full-state feedback regulator and the system input delay shaper to construct a system torsional vibration forcedstable controller; S5, adjusting the control parameters of the system torsional vibration forced stable controller according to a numerical simulation result. After the steps, the design is finished.By adopting the forced stable control method, torsional vibration of the driving shaft system is avoided from the source, the robustness of the conventional closed loop controller can be enhanced remarkably, the aim of effectively suppressing the torsional vibration of the driving shaft system is fulfilled, and safe and reliable application of the low-speed large-torque permanent magnet motor in the field of direct drive is ensured.

The invention discloses an integrated permanent magnet variable speed reducer which comprises a box (1), an adjuster (6), an input shaft (2) and an output shaft (8). The input shaft (2) is provided with a cylindrical high-speed permanent magnet motor (3) which is in synchronous rotation with the input shaft (2). The output shaft (8) is provided with a cylindrical low-speed permanent magnet motor (7) which is arranged correspondingly to the high-speed permanent magnet motor (3) and in synchronous rotation with the output shaft (8). The high-speed permanent magnet motor (3) is located in the inner cavity of the low-speed permanent magnet motor (7). A cylindrical modulation iron core (4) is arranged in the radial gap between the low-speed permanent magnet motor (7) and the high-speed permanent magnet motor (3). The modulation iron core (4) is extended into the radial gap between the low-speed permanent magnet motor (7) and the high-speed permanent magnet motor (3) or leaves from the radial gap between the low-speed permanent magnet motor (7) and the high-speed permanent magnet motor (3) through the driving of the adjuster (6). According to the invention, the infinitely variable speed function and the speed-reducing and torque-increasing function can be realized, the oil leakage problem does not exist, and advantages of energy conservation and environment protection, compact structure and high transmission efficiency can be realized.

The invention discloses a gravity loading type high pressure double-roller extrusion mill, comprising a mainframe rack provided with an extrusion mill working cavity, and a fixed shaft rotating roller and a movable shaft rotating roller arranged in the extrusion mill working cavity, and a pressurizing device movably arranged on the mainframe rack, wherein the pressurizing device applies an extrusion force to the fixed shaft rotating roller and the movable shaft rotating roller by controlling the position of the movable shaft rotating roller. The gravity loading type high pressure double-roller extrusion mill is characterized by further comprising a gravity loading mechanism acting on the pressurizing device, wherein the gravity loading mechanism comprises a heavy loading block, and the gravity of the heavy loading block is converted into the pressure between the fixed shaft rotating roller and the movable shaft rotating roller by the pressurizing device. The problem of large impact load caused by delayed response speeds of hydraulic loading and roller retreat is overcome in the prior art, horizontal vibration and torsional vibration of the main shaft are avoided and the working reliability of the whole machine is greatly improved.

The invention discloses a gasoline engine power transmission system anti-shock control method, which is characterized in that it comprises the following steps: 1) obtaining the actual engine speed and the target engine speed to obtain the engine speed difference; 3) Obtain the initial value of the anti-shock torque according to the filtered value of the anti-shock torque; 4) Compare the initial value of the anti-shock torque with the threshold value of the anti-shock torque to determine the fire path compensation torque , Air path compensation torque and oil supply status. The invention determines the compensation torque of the fire path, the compensation torque of the gas path and the fuel supply state according to different gears and operating parameters, and compensates the output torque of the fire path and the gas path of the engine, avoiding torsional vibration and resonance in the power system and transmission system.

The invention relates to a tool for absorbing the impact on the drill bit, reducing the friction between the drill pipe and the well wall, and improving the drilling efficiency. The technical solution is: the anti-jamming drilling speed-up tool mainly includes: , upper joint, disc spring I, outer cylinder, force transmission sleeve, piston head cover, shunt element, rolling bearing, turbine device, transmission shaft, adjustment ring, positioning cylinder, thrust bearing, transmission element, support cylinder, moving valve disc , bearing, fixed valve disc, sealing ring, inner sleeve of valve disc, disc spring II, hollow mandrel, first lower shell, second lower shell, lower joint; when the drill bit is subjected to impact vibration or excessive torque, the compression The disc spring is lifted upwards to prevent drill sticking; driven by the transmission shaft, the eccentric fit between the two valve discs converts the liquid energy into pulse pressure and transmits it to the slide rod, so that the static friction between the drilling tool and the well wall is converted into dynamic friction .

The invention discloses a downhole auxiliary drilling tool. The downhole auxiliary drilling tool comprises an impact energy generator and an impact energy distributor, wherein the impact energy generator can convert the energy of drilling fluid so as to generate axial impact energy; the impact energy distributor can re-distribute the axial impact energy generated by the impact energy generator soas to form axial impact energy and circumferential impact energy, so that impact force with high-frequency variation in composite direction is provided for a drill bit, and meanwhile, the downhole auxiliary drilling tool can increase the axial impact force of the drill bit and enhance the composite impact force, so that the rock breaking efficiency and the mechanical drilling speed of the drillingtool are greatly improved. The downhole auxiliary drilling tool further comprises a shock absorber arranged between the impact energy generator and the impact energy distributor, and the shock absorber can reduce the axial vibration of the drilling tool and the impact of the drill bit, so that the service life of the drill bit is effectively prolonged.

The invention belongs to a drafting device for a ring spinning frame, and particularly relates to a back zone double apron drafting device for the ring spinning frame, which mainly solves the technical problems of easy generation of back roller torsional vibration, over-proof thick and thin joints, deteriorated evenness and small spinnable range existing in an existing drafting device. The technical scheme of the invention is that the back zone double apron drafting device for the ring spinning frame comprises a wedge groove type back roller sliding seat, a straight groove type back roller sliding seat, a wedge-shaped locating block, a fastening screw, a lower short apron, a small-gauge deformed section lower pin, a lower apron check block, a back claw pressurizer connecting block, a rolling tension bracket assembly, a tension bracket supporting shaft, a tension bracket supporting block, a lower long apron, a rocking bracket, a universal upper pin, an upper short apron, a back leather roller, a back roller, a back roller bearing, a horizontal moving slab, a roller stool and a thick yarn feed horn, wherein a wedge groove of the wedge groove type back roller sliding seat is internally provided with the small-gauge deformed section lower pin and the wedge-shaped locating block which are fixed by the fastening screw.

The invention discloses a permanent magnet continuously variable speed reducer, which comprises a box body (1), an input shaft (2), a transmission shaft (8) and an output shaft (9). The end of the input shaft (2) is provided with The permanent magnet rotor (5) rotates with it, and the corresponding part of the permanent magnet rotor (5) is provided with a conductor rotor (7) opposite to the permanent magnet rotor (5), and the conductor rotor (7) is fixed on the transmission shaft (8) and rotate together with the transmission shaft (8), and the outer peripheral surface of the conductor rotor (7) is provided with a driving gear (6), the driving gear (6) and the driven gear (10) installed on the output shaft (9) mesh with each other The permanent magnet rotor (5) makes the permanent magnet rotor (5) slide along the axial direction of the input shaft (2) through the adjustment mechanism to change the torque transmitted between the permanent magnet rotor (5) and the conductor rotor (7). The invention has the functions of stepless speed change and deceleration to increase torque, compact structure, convenient installation, high transmission efficiency and long service life.