125results about How to "Achieve stiffness" patented technology

The invention discloses a rotating type rigidity-changing flexible joint which comprises a driven rigidity-changing mechanism and a driving flexible drive mechanism. The rotating type rigidity-changing flexible joint is characterized in that the driven rigidity-changing mechanism mainly comprises an output plate of the joint, a first drive plate of the joint, a second drive plate of the joint, a first cam set, a second cam set, a first cam set installing base, a second cam set installing base, a bare shaft, a supporting base of the bare shaft, a rigidity adjusting installing plate, a linear bearing and a spring. The first drive plate of the joint is fixedly connected with the second drive plate of the joint. The second drive plate of the joint and the output plate of the joint are provided with cam grooves with the same outline. By means of the outlines, the equivalent rigidity of the joint can change along with the flexible deformation angle of the joint. Cams of the first cam set and the second cam set can make contact with the second drive plate and the output plate of the joint at the same time. The driving flexible drive mechanism mainly comprises a trapezoidal lead screw, a lead screw supporting base, a lead screw nut, a lead screw bearing, a direct-current servo motor, a motor installing base, a coupler, a rigidity-changing adjusting base, a linear bearing and a spring.

The invention relates to a permanent-magnet type eddy current tuned mass damper which comprises a steel magnetic-conducting baseplate (10), wherein end plates (3) are respectively arranged at two ends of the baseplate (10). The permanent-magnet type eddy current tuned mass damper is characterized by also comprising a circular shaft (4) and a linear bearing seat (5), wherein two ends of the circular shaft (4) are respectively arranged on the corresponding end plates (3), and the linear bearing seat (5) is sleeved on the circular shaft (4) and can slide on the circular shaft (4); the lower part of the bearing seat (5) is connected with a mass block (6), and two ends of the mass block (6) are respectively connected with the corresponding end plates (3) through spiral springs (7); the lower part of the mass block (6) is connected with a permanent magnet (13), and a copper plate (12) is arranged below the permanent magnet (13) and connected with the baseplate (12) through a cushion block (11). By adopting an eddy current damping model with special design, the permanent-magnet type eddy current tuned mass damper realizes the damping adjustability of the damper in a larger range, realizes the complete separation between the system rigidity and the damper, and cancels the mechanical friction energy consumption and stress concentration elements, thereby avoiding the common TMD damage failure.

The invention provides a nested annular MEMS oscillation gyro with period distribution type concentrated mass blocks. The gyro comprises a nested annular harmonic oscillator with the period distribution type concentrated mass blocks, and an electrode which is arranged inside/outside the nested annular harmonic oscillator; the nested annular harmonic oscillator comprises a nested annular flexible frame, the mass blocks arranged on the nested annular flexible frame, and anchors for fixing the oscillator; the whole harmonic oscillator is fixedly anchored with a base by the anchor on the center of the harmonic oscillator; the nested annular flexible frame comprises nested rings and spoke-shaped supporting beams; the mass blocks can be additionally arranged on the nested annular flexible frame in a plurality of kinds of manners; and the electrode can be arranged inside/outside the harmonic oscillator, or the electrodes are arranged inside and outside the harmonic oscillator. The gyro has the relatively high thermo-elastic property Q value, relatively large resonance oscillation mass, and relatively large driving amplitude; and as the design of the internal electrode is adopted or the design of the internal and external electrodes is adopted, the gyro also has the advantages that the capacitance detection area is large, the number of detection and control electrodes is large and the like.

The invention relates to a method for refining crystal grains of a magnesium alloy plate, in particular to a preparation method for refining the crystal grains of the magnesium alloy plate by a circular cold rolling-annealing method. In the method, the magnesium alloy plate with refined crystal grains is obtained by repeatedly circulating cold rolling deformation and annealing according to such a rule that next cold rolling deformation is more than previous deformation and next annealing temperature is lower than the previous processing temperature, wherein the magnesium alloy plate comprises 0.1 to 10 weight percent of alloy element; and the size of the crystal grains of the magnesium alloy plate is greatly refined through several cold rolling deformation and annealing processes. The method is low in cost and simple in operation, can be used for mass production and is a method for economically and effectively preparing the magnesium alloy plate; and the magnesium alloy plate prepared by the method has the characteristics of low cost, high strength and plasticity and the like, and can be widely applied to various fields such as automobiles, aviation, communication, buildings and the like.

The present invention concerns a fastening system for fastening a first component to a second component with a precise separation. The present invention also concerns a method for fastening the first component to the second component with a precise separation, as well as an auxiliary apparatus for attaching the fastening system to the second component in order to place the first component on the fastening system. Preferably, the stud has an external thread and the support washer has a threaded hole matched to the external thread, so the support washer can be screwed onto the stud.

The invention belongs to the technical field of automation engineering and relates to an electromagnetic driving two-degrees of freedom spherical robot wrist and a control method thereof. The electromagnetic driving two-degrees of freedom spherical robot wrist is a high-integration driving spherical wrist device, the two output ends of an internal universal joint and an external universal joint passing through the same rotating center are coaxially connected, and a radial magnetizing permanent magnet in a servo mechanism is directly driven by a coaxial servo magnetic moment in a space universal rotary magnetic field to realize side-sway and pitching two-degrees of freedom rotation. The electromagnetic driving two-degrees of freedom spherical robot wrist overcomes the defects of a complicated driving machinery wrist, the wrist driving system is simple and light in structure, high in transmission efficiency, static and dynamic performance and control and response speed, can solve the modeling problem of the existing spherical electromagnetic driving joint three-dimensional complicated magnetic field, realize precise modeling of the spherical electromagnetic driving joint magnetic field and precise decoupling of electromagnetic coupling and mechanical coupling, and remarkably improves the response sensitivity and positioning precision of electromagnetic driving spherical joint control.

The invention discloses an anti-collision method of a ship made of composite materials and a hull structure. The invention is mainly characterized in that sandwich plates (12) made of the composite materials are used as the outer walls of the hull, an integrated anti-collision bulwark (1) is adopted, the hull is in a 'cage type' structure, annular reinforced ribs are arranged on the side surfaces of the hull, and an energy-absorbing bow is adopted. The hull structure has the characteristics of light weight and high strength, and simultaneously, the overall anti-collision performance of the ship made of the composite materials is effectively improved through the comprehensive anti-collision structure design. When the ship has a collision on a front surface or a side surface, the comprehensive passive safety protection hull structure provided by the invention can effectively buffer an impact force caused by the collision of the ship, has good energy-absorbing effect and strong anti-deformation capacity, and is favorable for preventing or reducing casualties and property loss caused by the collision of the ship. The invention is especially suitable for the anti-collision design of the ship made of composite materials and has better application and popularization prospects.

The invention discloses a tail end Cartesian space rigidity modeling method for rope-driven linkage mechanical arm. The method includes: calculating integral joint equivalent rigidity of a mechanicalarm linkage rope, calculating according to a velocity-stage kinematic relation between a driving rope and a mechanical arm joint to obtain a Jacobian matrix Gq from a joint space to a driving space, acquiring integral joint equivalent rigidity of the driving rope of the mechanical arm according to a virtual work principle and a variational principle, and calculating mechanical arm joint equivalentrigidity Kq; calculating according to a velocity-stage kinematic relation between a mechanical arm joint variable and a tail end pose to obtain a Jacobian matrix Jq from the joint space to the tail end Cartesian space, and acquiring an equivalent rigidity Ke, in the tail end Cartesian space, of the mechanical arm joint equivalent rigidity Kq according to the virtual work principle and the variational principle. Rigidity analysis and control of the rope-driven linkage mechanical arm can be realized, and the method can be applied to rigidity analysis, statics analysis, force control and the like of the rope-driven linkage mechanical arm.

The invention provides a large-travel active adjusting damper of a SMA wire split sleeve. The large-travel active adjusting damper of the SMA wire split sleeve comprises a split sleeve, a super-elasticity SMA wire, a piston, two external bolts, two damping rings and a mounting frame; the inner wall of the split sleeve is a periodic diameter change cylindrical surface, and is complementary with the outer wall of the piston in shape; two ends of the piston are connected with the external bolts for connecting the damper with other parts; two sides of the piston are respectively provided with one damping ring; and the super-elasticity SMA wire is uniformly wound on the insulation outer wall surface of the split sleeve. The large-travel active adjusting damper of the SMA wire split sleeve fuses the material damping of a super-elasticity memory alloy, the dry friction damping and the damping ring damping to improve the vibration reducing performance, uses the structure of the periodic friction surface to enable once travel of the damper to include multiple loading and unloading processes of the super-elasticity SMA wire to effectively increase the vibration amplitude borne by the damper, can realize self-adaption rigidity and damping adjusting functions through control of the SMA wire, prevents the failure problem of a sealing piece, and is long in service life, wide in application range and high in reliability.

The invention discloses a variable-rigidity omnidirectional motion soft driver based on a line interference technology. The variable-rigidity omnidirectional motion soft driver based on the line interference technology comprises a corrugated expansion pipe, a hose, nylon filaments, a first air pipe, a second air pipe and a torsion limiting line; the hose is coaxially sleeved with the corrugated expansion pipe, and a first cavity is formed between the hose and the corrugated expansion pipe; the interior of the hose is equally divided into a plurality of second cavities in the axial direction; the nylon filaments are coaxially filled in the second cavities; the first air pipe communicates with the first cavity; the second air pipe communicates with the second cavities; and the torsion limiting line is detachably connected to the outer wall of the corrugated expansion pipe. According to the variable-rigidity omnidirectional motion soft driver based on the line interference technology, theexpansion and contraction movement of the corrugated expansion pipe is realized by inflating or exhausting air in the first cavity, the torsion movement is realized by the torsion limiting line, thebending direction and the rigidity of the corrugated expansion pipe are controlled by matching of the hose and the nylon filaments, the designed soft driver has various movement modes and adjustable rigidity, and the functions of grabbing, clamping and the like of objects can be well realized.

The invention belongs to the technical field of vibration reduction and noise reduction, and in particular, relates to a metamaterial vibration isolating technology. A ultralow-frequency and shock-resistance metamaterial vibration isolating device comprises a metamaterial vibration isolating part (1), a lower positioning cover (2), an upper positioning cover (3), an inner limiting shell (4), an outer limiting shell (5), a lower bolt set (6) and an upper bolt set (7). The ultralow-frequency and shock-resistance metamaterial vibration isolating device theoretically can realize any low frequency range, so that the metamaterial vibration isolating device can bear higher static load on an online elastic deformation section, and can realize ultralow-frequency vibration isolating effect of a vibration isolating system on a ultralow-frequency vibration isolating section; and the metamaterial vibration isolating device is high in shock resistance, and can improve the safety of the vibration isolating system. The metamaterial vibration isolating part is not limited by a base material, so that the adaptability is wide.

The invention belongs to the technical field of building structure vibration attenuation, and particularly relates to a tuned mass damping device utilizing eddy current for providing damping. The tuned mass damping device comprises a conductor plate and a permanent magnet, and is characterized by also comprising a main shaft, a spring and an eccentric mass block, wherein the eccentric mass block is fixedly arranged on the main shaft, or a rotating bearing is arranged between the eccentric mass block and the main shaft, one end of the spring is connected with the eccentric mass block, the conductor plate is fixedly arranged at one side of the eccentric mass block in a direction vertical to an axle line of the main shaft, the permanent magnet is positioned between the conductor plate and the eccentric mass block and is fixedly arranged on the eccentric mass block, a gap is formed between the conductor plate and the permanent magnet, and the conductor plate, the permanent magnet, the main shaft, the spring and the eccentric mass block jointly form a group of eddy current tuned mass damping structures. The eccentric eddy current tuned mass damping device has the advantages that the structure is simple, the practicability is high, safety and reliability are realized, the cost performance is higher, the tuned mass damping device can be widely applied to structure vibration control of various high-rise and super high-rise buildings, drawn-up structures or long-span buildings, and the market application prospects are very wide.

The invention discloses a method for constructing a template supporting platform with a spatial span wire structure, which comprises the following steps that: the mounting of a cantilever platform, the mounting of a central rigid annular cylinder, the mounting of a thread steel bar bearing cable, the mounting of a simple truss, the mounting of a lateral strut on the simple truss and a steel ring strut on the central rigid annular cylinder and the like. The built template supporting platform with the spatial span wire structure has a reasonable structure, convenient construction and good effect.

The invention relates to a test device for stiffness of a flexible spring, and the device comprises a spring trestle table and a dial indicator trestle table, wherein the spring trestle table has a cubic frame structure formed by a bracket rod and a square bracket plate; mutually symmetric round holes are arranged on the center of the bracket plate; a plurality of spring base mounting holes are uniformly distributed along the peripheries of the round holes; a plurality of spring base mounting holes are also uniformly distributed on the peripheries of two circular spring bases; a plurality of spring mounting holes are uniformly distributed along the periphery of a centre hole; the circular spring bases are fixed on the square bracket plate through the corresponding spring base mounting holes on the square bracket plate and the spring base mounting holes on the spring bases; the spring trestle table further comprises a spring motion shaft; the dial indicator trestle table comprises a support base having a slot and a connecting rod sliding block; a dial indicator is arranged on the other end of the connecting rod sliding block; and the contact of the dial indicator is tightly adheredto the upper surface of the flexible spring motion shaft. The test device can be used for measuring the radial stiffness and axial stiffness of the flexible springs in various sizes, and can be conveniently installed and simply operated.

The invention provides an analyzing method of time-varying mesh stiffness of a single roller enveloping worm gear pair and aims to acquire the time-varying mesh stiffness of the single roller enveloping worm gear pair. The method includes: deducing worm tooth bending stiffness, shear stiffness and radial compression stiffness formulas; calculating worm tooth base stiffness; calculating worm gear tooth bending stiffness and shear stiffness; calculating worm gear tooth base stiffness; calculating worm stiffness and worm gear stiffness at a disperse contact point; calculating contact stiffness; performing serial and parallel calculation on the worm stiffness, the worm gear stiffness and the contact stiffness; calculating the time-varying mesh stiffness. The method has the advantages that the time-varying mesh stiffness of the single roller enveloping worm gear pair can be calculated, the worm gear stiffness and the worm stiffness can be further decomposed, the worm tooth bending stiffness, shear stiffness and radial compression stiffness formulas are provided, a calculation model of the number of meshing worm gear teeth in a mesh cycle is provided, and the method is applicable to the dynamic performance analysis and optimization design of the single roller enveloping worm gear pair.

The invention belongs to the technical field of gas turbine equipment and particularly relates to a composite elasticity and damping shock resistance shock absorber of a gas turbine device. The shockabsorber comprises a mounting screw rod, a shock absorber upper cover, a shock absorber base, and integrally vulcanized main body rubber between the shock absorber upper cover and the shock absorber base; a height adjusting nut is arranged at the top of the shock absorber upper cover; a fastening locking screw is arranged on the side face of the height adjusting nut; a middle threaded hole columnand symmetrical lateral threaded hole columns are arranged on the shock absorber upper cover; a transverse isolating block and a middle rubber buffer block are arranged in the shock absorber base; a central isolating rubber ring and symmetrical lateral isolating rubber rings are arranged above the transverse isolating block; the middle threaded hole column is in threaded connection with a centralscrew rod; the lateral threaded hole columns are in threaded connection with a lateral screw rod; and a bottom buffer metal steel wire gauze pad, a belleville spring and a bottom compression resistance rubber pad are sequentially arranged below each of the central screw rod and the lateral screw rod. The shock absorber is used for realizing vibration isolation and underwater explosion impact resistance of the gas turbine device.

A tuning mass damping device comprises a section bar, a plate spring, mass blocks arranged at two ends of the plate spring and a damping portion. The section bar is provided with a web and fixed on a structural member to be damped or forms a part of the structural member to be damped. The plate spring penetrates the web of the section bar along the horizontal direction and is arranged symmetrically with the web as the symmetry center. One end of the damping portion is linked to a corresponding mass block in the vertical moving direction of the mass block, and the other end of the damping portion is fixedly connected with the structural member to be damped. The tuning mass damping device further comprises a rigidity limiting portion for limiting the free length of elastic moving of the plate spring in the vertical direction. By means of the device, section steel beam height space can be used effectively, requirements for building clear height are reduced, use rate of a building space is improved, and applicability of the damping device is improved.