155 results about "Axial rigidity" patented technology

The invention discloses a stacked mixed type flexible continuum surgical instrument. The stacked mixed type flexible continuum surgical instrument comprises a flexible continuum module and an end effector module connected with the flexible continuum module. The outer layer of the bending part of the flexible continuum module is provided with stacked and staggered rotational joints, the inner layer of the bending part of the flexible continuum module is provided with a notch type flexible framework which is integrally cut and processed, and gaps formed by stacking the rotational joints of the outer layer correspond to notches of a notch type flexible framework body one by one; rotating shafts between the rotating joints on the outer layer are in one-to-one correspondence with strain center shafts of the bent beams of the notch type flexible framework; and the bending part driving wires of the flexible continuum module are uniformly arranged in the circumferential direction of the side wall of the rotating joint. On the premise that more flexible operation freedom is guaranteed, the motion precision, the motion stability and the axial rigidity are improved, more accurate wire driving control is achieved, and meanwhile good flexibility and strength balance is achieved.

The present disclosure provides a two-stage seismic design method for a replaceable energy dissipation steel frame joint, comprising: based on a steel frame structure model with rigid connection of beam and column, determining an elastic bending moment distribution of frame beam under effect of vertical load, and determining a preliminary position of the replaceable energy dissipation joint; determining a yield bending moment My and an ultimate bearing capacity of a buckling-restrained brace of the replaceable energy dissipation joint to design a connection section of the buckling-restrained brace and a length thereof; determining a deformation requirement of the replaceable energy dissipation joint, and determining a lower limit of a length of a yield section of the buckling-restrained brace from the deformation requirement of the joint; determining an elastic axial rigidity requirement of the buckling-restrained brace; determining a bending moment-rotation angle constitutive relation of the replaceable energy dissipation joint.

The invention discloses a method for adjusting the axial rigidity of a connecting arm, which is characterized in that an elastic cylindrical component is connected between two axial butt-joint components, so that force transmission is realized by extruding the elastic cylindrical component no matter the two axial butt-joint components are mutually extruded and mutually pulled outwards in the axial direction, and the axial rigidity of the connecting arm is adjusted. And then the axial rigidity of the connecting arm is adjusted by changing the pretightening force of the elastic rubber ring in the axial direction. Stepless adjustment of the axial rigidity of the connecting arm can be better achieved, meanwhile, adjustment convenience is improved, and direct switching control of the connecting arm from flexibility to full rigidity can be achieved; the device has the advantages of convenience in adjustment, large adjustable range, better stability and the like.

The invention relates to an axial variable-stiffness soft driver based on soft tooth structure meshing slippage, and solves the problems that an existing soft driver lacks a resistance applying structure in the movement direction, the requirement for continuous adjustment of axial stiffness is difficult to meet, an external structure is difficult to assist in achieving resistance movement, and the requirement for small size and light weight is difficult to meet. The device comprises a driving core body and a soft damping body, the driving core body comprises an axial flexible pipe, a fabric wrapping layer, a thread rope winding layer, a flexible wrapping layer and a first pipeline, the axial flexible pipe is provided with an axial driving cavity, the fabric wrapping layer is provided with a thread rope winding layer, and the thread rope winding layer is provided with a thread rope winding layer; the soft damping body comprises a radial expansion cylinder, an outer cylinder, a second pipeline, a rear end cover and a front end cover, a plurality of inner-layer low-modulus soft teeth are arranged on the periphery of the radial expansion cylinder, and a plurality of outer-layer high-modulus soft teeth are arranged on the inner wall of the outer cylinder. The invention is widely applied to human motion driving and resistance application in the fields of medical rehabilitation, exoskeleton, interactive games, wearable equipment, soft robots and the like.

The invention relates to a method for installing flange connections, said method consisting of multiple steps. First, the flange parameters of the first and second flange are ascertained. The elongation behavior of the pin systems as well as the axial rigidity of the pins and of the flange body are then analytically ascertained. The maximally permissible gap dimension for preventing fatigue damage is then ascertained, and finally the required overall rigidity of the flange body is calculated while taking into consideration said gap dimension and the installation pretension force. After the pins are installed and pretensioned, the achieved rigidity is checked and compared with the target value.

The invention belongs to the related technical field of health detection, and discloses a structural system identification method and equipment during pouring construction of an arch bridge cantilever, and the method comprises the following steps: dividing the construction process of the arch bridge cantilever into a plurality of construction stages, and designing a measuring point position based on an observability state equation of the corresponding construction stage, and performing structural system identification on each construction stage by utilizing an observability technology one by one to obtain the bending rigidity and the axial rigidity of all arch rib beam units in the corresponding construction stage. According to the method, in each construction stage of arch bridge cantilever casting, the equivalent stiffness matrix equation is converted into the observable state equation, the observable state equation is solved through the null-space method, analytical solutions of the axial stiffness and the bending stiffness of arch rib beam section units in each construction stage are obtained, and the recognition precision is improved.

The invention discloses a design method for parameters of a BRB and a connecting gusset plate of the BRB based on rigidity matching, and relates to the field of anti-seismic component design methods.The design method comprises the following steps that S1, the axial rigidity of an equivalent steel rod of a buckling-restrained brace is calculated; s2, calculating the rigidity of the buckling-restrained brace member; s3, calculating the rigidity of upper and lower connecting gusset plates of the buckling-restrained brace; s4, calculating equivalent series stiffness after the connection node plates at the upper end and the lower end are connected with the buckling-restrained brace in series; and S5, checking the consistency of the equivalent series stiffness and the equivalent axial stiffness of the steel rod. According to the method, the size design of the buckling-restrained brace and the connecting gusset plate of the buckling-restrained brace can be more efficiently and accurately carried out, and the rigidity matching problem of an equivalent steel rod of the buckling-restrained brace in a model structure and an energy dissipation component formed after the buckling-restrained brace and the gusset plate are connected in series in an actual structure can be solved.

The utility model relates to the field of detection devices, in particular to a spherical hinge multi-working-condition performance detection device. The first sliding mechanism is arranged on the mounting base; the spherical hinge mounting seat is arranged on the first sliding mechanism opposite to the other side of the mounting base; a fixing hole is formed in the spherical hinge mounting seat; the spherical hinge is connected with the spherical hinge mounting seat; the bracket is arranged on the mounting base; the spherical hinge connecting mechanism is connected with the spherical hinge on the other side relative to the spherical hinge mounting seat and is connected with the bracket; the second sliding mechanism is arranged on one side of the support and connected with the spherical hinge connecting mechanism. Compared with an existing spherical hinge detection device, the spherical hinge detection device can carry out a spherical hinge radial rigidity test, an axial pull-off test, an axial rigidity test, a torsion durability fatigue test, a deflection durability fatigue test and the like, multiple tests can be carried out on the spherical hinge through one device, and the functionality is good.

A tail assembly for a rotorcraft having a fuselage. The tail assembly includes a stabilizer having an aft spar and a forward spar. An aft joint couples the aft spar to the fuselage and defines a pitch axis such that the aft joint allows the stabilizer to pivot about the pitch axis. A forward joint couples the forward spar to the fuselage. The forward joint has an axial stiffness configured to tailor a chordwise pivot mode of the stabilizer and a bending stiffness configured to tailor a beamwise bending mode of the stabilizer. The chordwise pivot mode of the stabilizer is decoupled from the beamwise bending mode of the stabilizer.

A scissors structure includes a first arm member, a second arm member, and a first connecting member connecting a central portion of the first arm member and a central portion of the second arm member. The first and second arm members and the first connecting member are integrally molded, and the first connecting member is formed such that its torsional stiffness is low relative to its axial and bending stiffness.

The non-inflatable wheel adopting the wave springs as the supporting bodies comprises an outer tire layer, the wave springs and a hub, the hub is located in the center of the wheel, clamping grooves are evenly distributed in the outer edge of the hub, the wave springs are arranged in the clamping grooves, meanwhile, the wave springs are evenly distributed in the circumferential direction, and the outer tire layer is arranged between the outer tire layer and the wave springs. And the outer tire layer is tightly sleeved on the outer side of the hub. The non-inflatable wheel provided by the utility model adopts the wave spring as a tire support body, the structure is compact, the material in unit volume has better axial rigidity, the radial bearing capacity is strong, the weight of the support body is lighter, and the stability and the reliability are obviously enhanced; when the whole wheel works, the outer tire layer transmits force to the wave spring serving as a supporting body, the wave spring buffers and absorbs shock through axial and radial elastic deformation so as to weaken vibration and impact transmitted to the hub, and the problems that a non-inflatable wheel is low in axial rigidity, poor in reliability and the like are solved.

The invention provides a sliding seat assembly and processing equipment. The sliding seat assembly comprises a sliding seat main body and a heat-deformation-resistant plate, the sliding seat main body is made of a metal material; the thermal deformation resistant plate is arranged on the Z-axis negative side of the sliding seat main body and is fixedly connected with the sliding seat main body; the heat-deformation-resistant plate is made of mineral-based materials, and an X-axis motor rotor mounting part is arranged on the side, away from the sliding base body, of the heat-deformation-resistant plate and extends in the X-axis direction. According to the sliding seat assembly, the axial rigidity can be greatly enhanced, the problem of casting deformation under long-term high suction is solved, and meanwhile the service life of the linear motor is prolonged.

The utility model relates to the technical field of auxiliary frame bushings, in particular to an auxiliary frame bushing preloading test fixture, which comprises a fixture upper main body, a first fixture lower main body, a second fixture lower main body and an auxiliary frame bushing, a test ring is arranged between the side walls, close to each other, of the first clamp lower main body and the second clamp lower main body, a backing ring is arranged on the side wall of the inner ring of the test ring, the inner side wall of the backing ring is attached to the outer side wall of the auxiliary frame bushing, and a groove right opposite to the test ring is formed in the lower end of the clamp upper main body. According to the utility model, the first clamp lower main body and the second clamp lower main body are arranged, and the first clamp lower main body and the second clamp lower main body are fixed through the four second bolts, so that the auxiliary frame bushing has lateral preload, and the problems that in the prior art, when radial rigidity is detected, only vertical load can be loaded, and preload cannot be increased in the lateral direction are solved; the detected rigidity cannot truly reflect the loading state rigidity, so that the detected radial rigidity is inconsistent with the rear axial rigidity of actual loading preloading.

The utility model relates to a plate spring and a Stirling cryocooler, which comprise a base circle part provided with a base circle part mounting hole; one end of each cantilever is connected with the base circle part, and the other end of each cantilever freely extends around the vertical central axis of the base circle part in the same direction. The plate spring is light in weight and small in size, the radial rigidity can be effectively improved under the condition that the ratio of the maximum stress to the axial rigidity is not greatly changed, stress distribution is more uniform when the plate spring works, and stress concentration is effectively reduced.

The two-stage seismic design method of replaceable energy-absorbing steel frame nodes provided by the present invention comprises: determining the elastic bending moment distribution of the frame beam under the vertical load based on the traditional beam-column rigid connection steel frame structure model, determining the preliminary position of the replaceable energy-absorbing node; determining the yield bending moment M ... y and the ultimate bearing capacity of the anti-buckling brace, so as to design the connection section and length of the anti-buckling brace; determine the deformation demand of the replaceable energy-absorbing node, and determine the lower limit of the yield section length of the anti-buckling brace based on the node deformation demand; determine the elastic axial stiffness demand of the anti-buckling brace; determine the moment-rotation constitutive relationship of the replaceable energy-absorbing node based on the yield axial force, elastic stiffness and post-yield stiffness of the anti-buckling brace, which can solve the problems of unclear rotation stiffness of the replaceable energy-absorbing node due to weakened stiffness and the difficulty in analyzing the internal force of the structure caused by it, and can perform seismic design of the replaceable steel frame node based on the flange rotation mechanism on the beam.

This invention relates to a production line collaborative control method for a high-speed stamping sheet metal robot. The robot includes a lifting device, a swinging device, a guide sleeve assembly, a forearm link, and an end effector, and the lifting, swinging, sleeve rotation, and end effector linear motion are controlled by a drive unit. This configuration simplifies the structure and improves axial stiffness and response speed by combining single-sided active drive with end effector direct drive, achieving high-speed and stable sheet metal handling. The corresponding whole-line collaborative control method establishes a geometric envelope model for the equipment and performs collision interference judgment based on the model. It utilizes multiple strategies such as phase delay, speed adaptation, and trajectory optimization for chain-like coordinated planning, systematically eliminating equipment interference risks and maximizing the overall production cycle time while ensuring safety. This invention solves the collaborative problems of jitter, interference, and cycle time bottlenecks in high-speed stamping, significantly improving the efficiency, reliability, and intelligence level of the production line.

The invention provides an equivalent thin layer unit simulation method and system for an eVTOL aircraft threaded connection structure. And respectively calculating the axial rigidity of the internal thread under the unit length, the radial rigidity of the internal thread under the unit length, the axial rigidity of the external thread under the unit length and the radial rigidity of the external thread under the unit length. And calculating the axial total rigidity and the radial total rigidity of threaded connection, and determining the axial modulus and the radial modulus of the equivalent thin-layer material. In the finite element model, establishing a thin layer unit at a threaded connection interface, and endowing the thin layer unit with an axial modulus and a radial modulus; and connecting the thin layer unit and the two parts in threaded connection through binding constraint, and applying a pre-tightening force and a dynamic load to complete construction of a simulation model. Therefore, the simulation precision is improved, the dynamic response error is reduced, and the nonlinear behavior of the thread under multiple working conditions can be accurately simulated.

A linear positioning drive is disclosed having: low cost, high axial stiffness, zero backlash, high speed capability, high load capacity, long service lifespan, and low heat production. Cost reductions vs. prior art are most significant for drive lengths over one meter. A motor supporting carriage carries a drum sheave held perpendicular to the linear movement direction. Dual cables extend from the drum in parallel but opposite directions at the drum groove helix angle. Cable reeving with multiple dead wraps ensures retention of this cable to groove angular alignment, which in turn, supports long service lifespans for both cable and drum. Each drum rotation moves the dual cable-to-drum departure locations one drum groove pitch, and moves the carriage one groove helix wrap length. Both movements are linearly proportional to any extent of drum rotation. Cable to drum groove alignment is thus maintained over the full range of carriage movement.

The main structure optimization of the force measurement system is divided into three parts: structure parameter optimization of force measurement branches, structure parameter optimization of non-branch structures, and structure parameter fine-tuning of the entire force measurement system. Quantitative design is performed on each part to improve the design efficiency and accuracy of the force measurement system. During the quantitative design process of each part, an elastic resistance error is treated as a forward design indicator and is one of the main components in a coupling error. The structure parameters involved in the elastic resistance error are relatively comprehensive, and the elastic resistance error is considerably correlated with the structure parameters of the force measurement system in consideration of the influence of axial stiffness and lateral deviation stiffness of force measurement on the structural performance. The accuracy of structural analysis and design are thus ensured.

The present invention belongs to the technical field related to health monitoring, and discloses a method and device for identifying the dynamic structural system of a box girder bridge considering the shear lag effect. The steps are as follows: (1) Based on the one-dimensional beam element, the longitudinal displacement difference of the wing plate is introduced as the generalized degree of freedom of shear lag, and then the stiffness matrix and mass matrix of the box girder element considering the shear lag effect are constructed; (2) The structural undamped free vibration state equation of the box girder element is constructed, and then the boundary condition constraints are introduced to construct the dynamic observability state equation; the modal analysis of the beam element is carried out, and the pseudo-observations of the longitudinal displacement difference of the nodes are calculated based on the obtained modal parameters; (3) The modal parameters and the pseudo-observations of the longitudinal displacement difference of the nodes are used as input quantities and substituted into the dynamic observability state equation, and then the dynamic observability state equation is solved by using the null space matrix of the coefficient matrix of the observability state equation to obtain the axial stiffness and flexural stiffness of the box girder. The present invention improves the identification accuracy.

The invention provides a forceps channel pipe and a preparation method thereof. The clamp channel pipe at least comprises a bent section and a main body section from the front end to the rear end in the axial direction, and the axial rigidity of the bent section is smaller than that of the main body section. The bending section comprises a bending section inner layer, a bending section middle layer and a bending section outer layer, and a spring winding layer formed by winding metal wires according to a preset screw pitch or a continuous first weaving layer formed by a plurality of metal weaving grids woven according to a first weaving mesh number is formed in the bending section middle layer penetrating through the bending section; the main body section comprises a main body section inner layer, a main body section outer layer and a main body section middle layer at least partially arranged between the main body section inner layer and the main body section outer layer, and the main body section middle layer is a continuous second woven layer formed by a plurality of metal woven grids woven according to a second weaving mesh number. On the premise that the structural complexity of the channel clamping pipe is not remarkably increased, different mechanical requirements of the channel clamping pipe at different positions are met, and the use performance of the channel clamping pipe under the complex operation working condition is improved.

The invention discloses adjustable dredging equipment, which belongs to the technical field of hydraulic engineering and comprises a pump body and an extension arm. The extension arm comprises two segmental chain belts and two convolution discs, the segmental chain belts only have one-way winding freedom degrees, one ends of the segmental chain belts are matched with the pump body, the other ends of the segmental chain belts can be driven to be wound around the corresponding convolution discs, the two segmental chain belts are oppositely arranged, and the winding freedom degrees are opposite in direction. The segmental chain belt can form a continuous structure with certain axial rigidity in a specific direction when being unfolded, and can be wound and stored around the convolution disc when being retracted, so that the occupied space is small, and a large-range extension distance can be provided for the pump body. The two sectional chain belts can form symmetrical structures which interfere with each other and support each other in an unfolded state, stable truss type support can be formed, enough bending rigidity is provided for the pump body, the swing problem caused by flexible connection is avoided, and the underwater posture stability is improved.

The application discloses a full magnetic suspension system based on bidirectional active axial force of a rotor and a control method thereof. The full magnetic suspension system is provided with an axial force winding 3, and a magnetic field rotating synchronously with the rotor generated on the winding can generate stable axial forces in two directions of attraction and repulsion to compensate for axial hydraulic force. The size and direction of the active axial force generated on the rotor can be actively controlled through the current on the axial force winding 3. The active Maxwell force and the Lorentz force in the axial direction are active suspension forces, and together with passive magnetic resistance force, form a composite axial suspension force. The application can effectively improve the axial stiffness by increasing the active axial force. The control method provided by the application can make the axial force of the rotor have good dynamic response speed, and has better anti-interference ability compared with passive suspension. The active axial electromagnetic suspension system greatly improves the stability performance of the magnetic suspension pump in the axial direction.

The utility model belongs to the technical field of bushing production, and particularly relates to an open bushing for a whole automobile, which comprises a bushing inner pipe, a bushing outer pipe sleeved outside the bushing inner pipe and an elastic layer arranged between the bushing outer pipe and the bushing inner pipe, a plurality of frameworks are arranged on the outer wall of the bushing inner pipe along the axis of the bushing inner pipe in a surrounding manner, and the framework is arranged on the outer wall of the bushing inner pipe. Therefore, the axial rigidity and the radial rigidity of the bushing are improved. The arc-shaped framework is arranged between the lining outer pipe and the lining inner pipe in a surrounding mode, so that the radial rigidity of the lining is improved more comprehensively through the radian of the framework; and secondly, the framework is also embedded into the elastic layer, so that the contact area between the lining inner pipe and the elastic layer is increased, the vulcanization area is increased, the axial rigidity of the lining is further improved, and the product quality of the lining is effectively improved.

The present invention discloses a composite loading device for a bearing testing machine, including an axial loading device, a tipping loading device, an ejector positioning device and a loading base. The axial loading device is located on the upper side of the tipping loading device, and is used to apply loads in both tensile and compressive directions to the tested bearing shaft; the tipping loading device is located in the middle position, and can apply a bidirectional tipping load to the tested bearing shaft; the ejector positioning device is located on the lower side of the tipping loading device, and is used to support the bearing test fixture to increase the axial stiffness of the axial rotating part; the loading base is located above the frame, and is used to install the loading part, the tipping loading device and the ejector positioning device. The present invention is a special loading device for bearing composite testing equipment, specifically a composite device used for loading the test bearing in the axial and tipping directions during bearing testing, and when two loads are applied to the test bearing, the bearing can only bear the tipping load and the axial load.

The application discloses a rotor supporting structure with simultaneously adjustable axial and radial stiffness, which comprises an axial weak stiffness squirrel cage, a limiting ring and a fastening screw. The axial weak stiffness squirrel cage is in a folded-back structure form, and a bearing mounting seat is arranged on the inner mounting edge of the axial weak stiffness squirrel cage; the bearing mounting seat and the limiting ring form a bearing mounting cavity, thereby achieving axial fixation of the outer ring of the bearing; and a spoke is arranged on the outer mounting edge of the axial weak stiffness squirrel cage, so as to provide smaller axial stiffness. The fastening screw is used for connecting the axial weak stiffness squirrel cage and the limiting ring. The supporting structure has the advantages that smaller radial stiffness can be achieved to reduce the critical speed of the rotor system and reduce rotor vibration, smaller axial stiffness can be achieved to ensure that the rotor system can freely expand and shrink under the action of temperature load, and the supporting structure has a large adjustable range of axial and radial stiffness.

The utility model discloses a biaxial rigidity vibration isolator which comprises a T-shaped support, a shell and two sets of movable lugs, a vibration isolation assembly is arranged in the shell, the vibration isolation assembly in the shell is connected with the end of the T-shaped support, the number of the movable lugs is two, the two sets of movable lugs are arranged outside the shell respectively, and the two sets of movable lugs are connected with the T-shaped support. The T-shaped support is connected with an engine installation joint, and the movable lug piece is connected with an engine frame. The vibration isolator for the engine is simple in structure and compact in assembly, the rigidity is adjusted by changing the mass of the metal wire mesh blocks, the vibration isolator can be designed into two axial rigidity vibration isolators according to needs, and the vibration isolator has good application prospects in the field of vibration isolation installation of turboprop engines.

A method for testing the stiffness of elastic joints in railway vehicles involves first applying an axial force to the outer surface of the elastic joint, reducing the elastic clearance to zero and ensuring the outer surface of the elastic joint is in contact and maintained. Then, forces are applied radially to the outer surface and axially along the axial mandrel to detect the axial and radial stiffness of the elastic joint. Applying an axial force to the outer surface first, reducing the elastic clearance to zero, effectively applies a preload to the elastic joint, eliminating the influence of clearance on the stiffness test results in subsequent axial and radial stiffness tests, making the test results more closely reflect actual operating conditions.

This invention discloses a design method for a large-scale conical shell-end tooth connection structure for aircraft engines, belonging to the field of aircraft engine design. This method addresses the arc-end tooth-short bolt connection structure, a key part of a large-scale aircraft engine rotor. By clarifying its structural characteristic parameters, conducting load environment and force analysis, and clarifying optimization design objectives and four constraints (design interface deformation coordination, interface contact damage, preload loss, and axial stiffness characteristics), the design objectives are integrated into an objective function and an appropriate constraint optimization method is selected to achieve a design method that optimizes the objective function. This method provides technical support for improving aircraft engine performance and ensuring reliability.