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 discloses a vibration damper assembly, which comprises a shock absorber mounting shaft, a spoke and a hub. A belt wheel having the function of an inertia disc is arranged outside the hub through a second-stage rubber ring, and is provided with a second-stage inertia ring. The shock absorber assembly is characterized in that the front end of the hub is connected in parallel with a first-stage rubber ring and a first-stage inertia ring. In order to eliminate the vibration caused by first-order vibration frequency of a crank, the first-stage rubber ring and a first-stage inertia ring form a torsional vibration damper consistent with the first-order vibration frequency of the crank. The first-stage inertia ring is arranged in the second-stage inertia ring. Because parallelly-connected two-stage vibration damper is adopted, and two stages of inertia rings are used, the working frequency of the vibrator damper is effectively reduced, the hardness of the rubber can be controlled in a certain range, and the service life of the crank of an engine is improved and the vibration and noise of the engine are reduced under the action of the vibration damper consisting of the two stages of inertia rings.

The invention provides a boost horsepower type power system stabilizer based on potential frequency in a generator. Adoption of double input signal boost horsepower consisting of generator shaft speed and active power is an effective measure to solve generator reactive power 'contra harmony', but a rotating speed signal is difficult to be measured; a torsion frequency block filter is adopted to avoid shafting torsional oscillation. In the invention, potential frequency in the generator calculated by line voltage and current of the generator is used to replace the generator shaft speed, as variation of the generator shaft speed is the same as the variation of potential frequency in the generator. Potential Eq in the generator can be calculated by measuring voltage U of the generator and current I of a stator, therefore, the generator shaft speed can be obtained by calculating the potential frequency in the generator so as to solve the problem that the generator shaft speed is difficult to be measured without attaching an active power inverter and a rotating speed inverter.

The invention provides a half-section type free lacing wire structure of a turbine blade with a top tangent circle, wherein the cross section of a part of the half-section type free lacing wire structure cooperating with a lacing wire hole of the turbine blade is shaped as follows: tangent circles are arranged on circular top and bottom parts respectively; and the height of each tangent circle is less than or equal to 20% the circular semi-diameter. A lacing wire of the half-section type free lacing wire structure has good sectional property which is beneficial to the bending of the lacing wire; two contact points exist between the lacing wire structure and the blade; through the adding of the contact points between the lacing wire and the blade, the total frictional force can be increased, so that the damping is increased and the vibration of the blade is decreased; and additionally, the lacing wire not only can decrease the vibration of a blade assembly along the radial direction and the peripheral direction, but also can effectively decrease the axial vibration and the torsion vibration of the blade assembly.

The invention discloses an anti-impact control method for a power transmission system of a gasoline engine. The anti-impact control method is characterized by comprising the following steps of (1) acquiring an actual engine speed and a target engine speed, and thus obtaining an engine speed difference; (2) carrying out primary differentiation or secondary differentiation on the engine speed difference, then carrying out filtering processing, and thus obtaining an anti-impact torque filtering value; (3) obtaining an anti-impact torque initial value according to the anti-impact torque filteringvalue; and (4) comparing the anti-impact torque initial value with an anti-impact torque threshold value, and determining a fire path compensation torque, a gas path compensation torque and an oil supply state. The fire path compensation torque, the gas path compensation torque and the oil supply state are determined according to different gears and operation parameters, the fire path output torque and the gas path output torque of the engine are compensated, and torsional vibration and resonance of a power system and a transmission system are avoided.

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.

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.

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.

The invention relates to the technical field of flight vehicles, in particular to a power system structure of a coaxial dual-rotor-wing unmanned aerial vehicle. The power system structure of the coaxial dual-rotor-wing unmanned aerial vehicle is used for solving the problems of low efficiency and poor stability of an existing coaxial dual-rotor-wing unmanned aerial vehicle power system. The powersystem structure of the coaxial dual-rotor-wing unmanned aerial vehicle comprises a miniature turboshaft engine, a main stage speed reducer and a two-stage speed reducer, wherein an output shaft of the main stage speed reducer is connected with an input shaft of the two-stage speed reducer, and the main stage speed reducer comprises a fuel oil lubricating system; the two-stage speed reducer comprises an input shaft, an inner output shaft assembly and an outer output shaft assembly, and the rotation direction of the inner output shaft assembly is opposite to the rotation direction of the outeroutput shaft assembly; and the two-stage speed reducer further comprises a lubricating oil lubricating system. By adopting the miniature turboshaft engine, the main stage speed reducer and the two-stage speed reducer, efficient output of power is realized, and the structural layout is simplified. The main stage speed reducer adopts the fuel oil lubricating system, the two-stage speed reducer adopts the lubricating oil lubricating system, cooling of the speed reducers is effectively realized, and stable work of the speed reducers is achieved.

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.

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.

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.

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 invention relates to a multistage rubber torsion damper, which comprises a damper outer shell and a damper inner shell; the damper outer shell is connected with an engine flywheel and receives torque transmitted by an engine, and the damper inner shell is connected with a transmission system component behind the damper inner shell through an inner hole spline and transmits the torque; the damper outer shell is arranged on the outer side of the damper inner shell in a sleeved mode; an outer ring of the damper outer shell and an inner hole of the damper inner shell are concentrically arranged; and a damping device is arranged between the damper outer shell and the damper inner shell. The multi-stage rubber torsion damper provided by the invention has the following beneficial effects that the resonant frequencies of an engine crankshaft system and a transmission system at different rotating speeds are reasonably adjusted, when the resonant frequencies are within the idle speed, the torsional rigidity of the torsion damper is small, the inherent frequency of a whole shaft system is effectively adjusted to the low range, torsional vibration is avoided, and idle speed noise is eliminated. In the working rotating speed interval, the torsional rigidity of the torsion damper is increased, and the working requirement is reasonably met.

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 turning connection device based on a high-precision detecting instrument. The turning connection device comprises a cylinder. The cylinder is fixedly connected with detectingequipment through a supporting unit. A connecting unit which can be connected with a to-be-detected part conveniently is arranged inside the cylinder. According to the turning connection device basedon the high-precision detecting instrument, friction moment imbalance of all part rotating shafts and turning connection pieces can be greatly reduced, deformation behaviors and twisting vibrations in the horizontal direction of shafting and tubular supports are effectively avoided, and therefore measuring errors finally caused by tiny deformation of the turning connection pieces and shafting dueto non-uniform bearing capacity of the turning connection pieces are effectively reduced.

The invention discloses a side support connecting structure for vibration reduction of towering equipment. The device comprises a connecting rod (3) which is arranged along the tangential direction of a barrel body of the towering equipment (2). The two ends of each connecting rod are respectively connected with a universal coupling (6), one universal coupling is connected with the equipment end support (5) through a connecting piece (7), and the other universal coupling is connected with the framework end support (4) through a connecting piece. The equipment end support is fixed to a barrel of the towering equipment, and the framework end support is fixed to the framework (1). A connecting rod, a universal coupling connected with the connecting rod and a connecting piece form a connecting rod assembly, a plurality of circles of connecting rod assemblies are arranged in the height direction of the towering equipment, and a plurality of connecting rod assemblies are arranged in each circle of connecting rod assemblies. The invention can be used for various towering equipment, such as towers, chimneys or torches in the industries of petrochemical engineering and the like.

The invention discloses a permanent magnet infinitely variable speed reducer which comprises a box (1), an input shaft (2), a transmission shaft (8) and an output shaft (9). The tail end of the input shaft (2) is provided with a conductor rotor (7) which is in rotation with the input shaft (2). The corresponding portion of the conductor rotor (7) is provided with a permanent magnet motor (5) which is arranged opposite to the conductor rotor (7). The permanent magnet motor (5) is connected with one end of the transmission shaft (8) and in rotation with transmission shaft (8). The other end of the transmission shaft (8) is provided with a driving gear (6). The driving gear (6) is engaged with a driven gear (10) installed on the output shaft (9). The axial sliding of the permanent magnet motor (5) along the transmission shaft (8) is enabled through an adjusting mechanism so as to change the torque transferred between the permanent magnet motor (5) and the conductor rotor (7). According to the invention, the infinitely variable speed function and the speed-reducing and torque-increasing function can be realized, and advantages of compact structure, convenient installation, high transmission efficiency and long service life can be realized.

The invention discloses an anti-swing shock isolation device. The device comprises a hollow inner cylinder, a hollow outer cylinder, a movement mechanism and a prestressed bolt. The inner cylinder is vertically and fixedly arranged on the ground or a non-protection structure; the inner cylinder is sleeved with the outer cylinder; the movement mechanism is arranged between the outer cylinder and the inner cylinder; the prestressed bolt horizontally penetrates through the side plate of one of the outer cylinder and the inner cylinder to be fixedly connected to the movement mechanism, and horizontally extrudes the movement mechanism on the side surface of the other one of the outer cylinder and the inner cylinder; and the protected structure is installed on the outer side surface or the upper surface of the outer cylinder. According to the anti-swing shock isolation device, the outer cylinder and the inner cylinder are both vertically arranged, and the prestressed bolt penetrates through the side plate of one of the outer cylinder and the inner cylinder to enable the movement mechanism to abut against the side surface of the other one, so that the outer cylinder can only move up and down in the vertical direction relative to the inner cylinder under the action of external force; and therefore, the protected structure can move up and down in the vertical direction under the action of external force, the problem of torsional vibration or overturning of the protected structure is avoided, and the shock insulation effect is enhanced.

The invention discloses an engine power transmission output structure. The engine power transmission output structure comprises an engine body with a plurality of cylinders. Each cylinder in the engine body comprises a cylinder sleeve embedded in a corresponding cylinder sleeve hole of the engine body, a piston in the cylinder sleeve, and a piston rod connected with the piston, wherein a rocker crank pin is hinged to the piston rod, and the rocker crank pin is composed of rocker cranks on the two sides and a crank pin connecting the two rocker cranks. The engine body is internally provided with output rocker gears corresponding to the cylinders, and the output rocker gears are in power transmission connection with the rocker cranks of the rocker crank pins. The engine body is internally further provided with torque common rail transmission shafts, and the torque common rail transmission shafts are engaged with the output rocker gears to finally transmit and output power of all the cylinders to engine flywheels. The engine body is internally provided with large guiding gears corresponding to the cylinders. The rocker cranks of the rocker crank pins are sleeved with small guiding gears, and the small guiding gears do the circumferential movement in the large guiding wheels, so that the crank pins of the rocker crank pins do the vertical movement.