49 results about "Axial rigidity" patented technology

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.

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.

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.

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 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.

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 provides a vibration isolator suitable for a satellite momentum wheel vibration isolation support, comprising a first retaining block (2a), a connecting block (3), and a second retaining block (2b) arranged sequentially; it also includes two symmetrically arranged first elastic components (1a) connected between the first retaining block (2a) and the connecting block (3), and two symmetrically arranged second elastic components (1b) connected between the connecting block (3) and the second retaining block (2b); damping energy dissipation materials (5) are respectively provided between the symmetrically arranged first elastic components (1a) and between the symmetrically arranged second elastic components (1b). This invention has low lateral stiffness, high axial stiffness, and large damping characteristics. By reasonably arranging and installing it between the support and the momentum wheel, it can effectively meet the vibration isolation requirements of the momentum wheel; this invention has advantages such as simple and compact structure, convenient processing and assembly, high design freedom, stable and reliable performance, light weight, and low cost.

This invention discloses a curved tube, comprising a tube body. At least one set of rotating shaft structures are cut along the length of the tube body wall. Each set of rotating shaft structures includes a first row of rotating shaft plates and a second row of rotating shaft plates arranged radially opposite each other. The first row of rotating shaft plates includes at least two spaced-apart first rotating shaft plates, and the second row of rotating shaft plates includes at least two spaced-apart second rotating shaft plates. The first and second rotating shaft plates are horizontally offset or horizontally arranged on the tube body. A first cutting cavity is provided around the first rotating shaft plates, and a second cutting cavity is provided around the second rotating shaft plates. The curved tube of this invention has a simple tube body structure, low manufacturing cost, higher connection strength, better axial stiffness, and stronger self-resetting capability. This invention also provides an insertion tube and an endoscope.

The present disclosure describes a microfabricated intravascular device configured for high axial strength, while the microfabricated intravascular device also maintains effective flexural flexibility. A pipe member includes a series of circumferentially extending rings that are interconnected by a series of axially extending beams. The transverse cutouts separate and define the rings. A series of axial cutouts are aligned with the beam and extend partially from the beam into the adjoining ring such that the beam length is nested partially within the axial length of the adjoining ring. This increases the functional length of the beam to provide flexural flexibility while still having sufficient ring structure to provide effective axial stiffness.

The utility model relates to a suspension bushing, suspension system and vehicle, including inner skeleton, outer skeleton and rubber, said rubber is provided with in the radial direction between said inner skeleton and outer skeleton, said outer skeleton and / or inner skeleton is provided with extrusion part, extrusion part extrudes the rubber to reduce the deformation when rubber bears the working condition load. According to the suspension bushing, the rubber is extruded through the cooperation of the extrusion parts on the outer framework and / or the inner framework, so that the deformation of the rubber when the rubber bears working condition loads is reduced, the axial rigidity of the suspension bushing is improved, the modality of the suspension bushing is improved, and the NVH performance of the suspension bushing is improved.

The present disclosure describes a microfabricated intravascular device configured for high axial strength while also maintaining effective bending flexibility. A tubular member includes a series of circumferentially extending rings interconnected by a series of axially extending beams. Transverse cuts separate and define the rings. A series of axial cuts are aligned with the beams and extend partially from the beams into the adjoining rings such that the beam length is partially nested within the axial length of the adjoining rings. This increases the functional length of the beams to provide bending flexibility while still having sufficient ring structure to provide effective axial stiffness.

The invention relates to a high-robustness pull rod design method of a gas turbine, which comprises the following steps of: calculating maximum imposable force and minimum imposable force of a pull rod; determining a reasonable range of the neck diameter of the pull rod according to structural limitation and material performance; carrying out structural design of the pull rod and calculating the axial rigidity of the pull rod to ensure that the axial rigidity of the pull rod and the axial rigidity of a rotor wheel disc meet a matching relationship; and carrying out vibration mode analysis on the pull rod and the rotor, and finally determining pull rod design parameters through iterative optimization. Through the systematic design process, the pre-tightening force holding capacity of the center pull rod under the abnormal working condition is remarkably improved, end teeth are effectively prevented from disengaging or sliding, and the robustness and operation safety of a rotor system are enhanced.

The application discloses a high-precision roller screw super-precision grinding and profile precision control system and relates to the technical field of grinding processes; the system comprises a rigidity confirmation module, a parameter acquisition module and a parameter adjustment module; the rigidity confirmation module is used for acquiring the axial rigidity distribution and the axial position of a grinding head in a grinding process and finding the equivalent rigidity value corresponding to the axial position in the axial rigidity distribution according to the axial position; the parameter acquisition module is used for acquiring the load signal and the workpiece deflection in the grinding process, converting the workpiece deflection into the elastic deformation force based on the equivalent rigidity value, and obtaining the actual grinding contact force by deducting the elastic deformation force from the load signal; the parameter adjustment module is used for checking and correcting the actual grinding contact force, obtaining the corrected actual grinding contact force, and generating the real-time grinding parameter adjustment value in combination with the equivalent rigidity value; and the initial grinding module is used for completing the initial grinding; through the cooperative work of the multiple modules, the application constructs a complete grinding precision control process and improves the consistency of the profile precision of the screw.

The application discloses a medical catheter structure, which comprises a tube body, the tube body is a hollow structure, a plurality of circumferentially extending cutting zones and a plurality of connecting ribs arranged in the cutting zones are arranged on the tube body along the axial direction of the tube body, the cutting zone can be a strip-shaped slot or a spiral slot cutting zone, and the tube body does not have two sections with the same distribution position of the connecting ribs in the circumferential direction. The application sets the connecting rib in the strip-shaped slot cutting zone to reduce the harmful bending moment effect of the catheter, continuously and gradually changes the same ability of the axial stiffness, the torsional stiffness and the bending stiffness of the catheter in any bending direction, and sets the elimination rib and the elimination moment rib in the spiral cutting slot cutting zone to reduce the spring effect of the pure spiral cutting slot catheter.

The invention belongs to the technical field of tilt-rotor aircraft rotor system design, and particularly relates to a method for adjusting flapping vibration of an elastic constant-speed universal hinge of a rotor hub. By reasonably configuring the radial rigidity of the elastic ball bowl of the elastic constant-speed universal hinge and the axial rigidity of the two universal hinges of the elastic ball hinge connecting rod, the transverse displacement of the elastic constant-speed universal hinge when the rotor hub flaps is reduced. Therefore, the three-time rotating speed transverse vibration of the elastic constant-speed universal hinge is reduced, the additional counterweight weight of the tilt-rotor aircraft propeller hub shock absorber is reduced by three times, and meanwhile the structural design of the constant-speed universal hinge is optimized.

The invention provides a bolt connection strength simulation analysis method and system, and relates to the technical field of simulation analysis methods, and the method comprises the following steps: respectively calculating the axial rigidity of a bolt and the compression rigidity of a connected piece by adopting an axial elastic modulus method, constructing a parallel rigidity distribution model, and calculating the additional tension of the bolt; respectively calculating the axial tensile stress and the shear stress of the bolt by adopting an area uniform stress method, and calculating the equivalent stress of the bolt by adopting a shear strain energy equivalent method; and calculating the safety coefficient of the bolt by adopting an equivalent stress safety margin method, comparing the safety coefficient with a preset safety threshold value, and outputting a corresponding bolt strength grade. The additional pulling force is dynamically distributed through the rigidity of the bolt and the connected piece, and the force transmission characteristic in the actual bearing process is closer; by introducing the screw pitch to correct the nominal diameter, the actual stress distribution of the thread root is described more accurately; the equivalent stress is calculated through a shear strain energy equivalent method, and the yield criterion of the plastic material is better met.

The invention relates to a method for mounting a flange connection. The method consists of a plurality of steps. First, flange parameters of a first flange and a second flange are determined. The elongation behavior of the bolt system and the axial stiffness of the bolts and the flange body are then determined by analysis. Subsequently, in order to avoid fatigue damage, a maximum allowable gap dimension is determined. And finally, considering the gap sizes and the mounting pre-tightening force, and calculating the overall rigidity required by the flange main body. After the bolt is installed and tensioned, the reached stiffness is checked and compared to a target value.

The invention belongs to the technical field of bridge structure health monitoring, and discloses a suspension bridge structure system identification method based on observability and state estimation and a high-efficiency algorithm thereof. According to the characteristics of different components of the suspension bridge, an observability state equation of the suspension bridge is established, the identifiability problem of unit parameters is converted into the solvability problem of a mathematical equation, a Jacobian matrix is constructed in combination with a state estimation high-efficiency algorithm (OM-SE), explicit mapping between measurement data and state variables is achieved, and the measurement accuracy of the suspension bridge is improved. And the parameter identification precision and the calculation efficiency are improved. The overall rigidity matrix is established through the parabola main cable unit, the Euler-Bernoulli beam unit and the direct rigidity method, parameter inversion is performed by adopting a double-layer iteration process, the method is suitable for identifying the bending rigidity of the main beam and the axial rigidity of the cable of the large-span suspension bridge, and the method is verified through a reduced scale model test and an actual suspension bridge numerical value case, and the method is suitable for identifying the bending rigidity of the main beam and the axial rigidity of the cable of the large-span suspension bridge. The identification error is controlled within 5%, and the calculation efficiency is improved by more than 70%.

The present application relates to pipeline coupling impedance test technical field, especially a kind of pipeline coupling impedance test support device.It includes two symmetrically arranged halves, the opposite end surface of two halves is attached, two clamps are symmetrically arranged on the inner ring of two halves, the opposite end surface of two clamps is attached and is detachably connected into an entity by connecting piece;The front and rear two axial end surfaces of the half are detachably connected spring sheet one end by connecting piece, and the front and rear two axial end surfaces of the clamp of the inner ring of half are detachably connected the other end of spring sheet by connecting piece.The clamp of the present application can constrain the radial displacement of the measured sample, at the same time, spring sheet can provide smaller axial stiffness, during the coupling impedance test process, axial excitation can cause sufficient axial response for measurement.

A multidisciplinary digital twinning modeling method and device for an electric servo mechanism belongs to the field of digital twinning technology and mechatronics systems, and is characterized in that static stiffness analysis is performed on a planetary gear reducing mechanism and a ball screw transmission mechanism to obtain gear pair torsional stiffness and screw pair axial stiffness; then, based on a multi-degree-of-freedom kinetic model and a Lagrange equation, establishing a linearization motion equation including gap nonlinear stiffness; constructing a complete electromechanical control missile multidisciplinary dynamic model; through multidisciplinary coupling modeling, multi-scale analysis and fault model integration, mechanical transmission characteristics, motor and control characteristics and fault mechanisms of the electric servo mechanism can be completely reflected, and corresponding mathematical and simulation models are constructed. The constructed digital twinborn simulation platform can provide solid theoretical basis and technical support for design optimization, performance improvement, fault diagnosis and health assessment of the servo system, and has important application value and popularization significance.

This invention relates to a paper-inspired bionic dual-segment flexible continuous robotic arm. The robotic arm employs a paper-inspired bionic dual-segment composite main structure design, with a one-piece molded flexible main body as its core. The elastic deformation of flexible hinges simulates the crease movement of paper folds, and combined with non-vector visual servo control, it uses line drive to achieve bending and precise positioning in confined spaces. This robotic arm is integrally molded using 3D printing technology, eliminating the mechanical gaps and connection failure risks associated with traditional assembly. Furthermore, it adopts an axial stiffness gradient design, offering advantages in high dexterity, high stability, and compact structure in confined space operations such as minimally invasive surgery and precision procedures.

The utility model provides a damping mechanism for an aircraft interior, which relates to the field of aircraft interior accessories and comprises a fixing box and a support, the fixing box is provided with a containing space, a damping bag is arranged in the containing space, and the support enters the containing space and is connected with the damping bag, so that the support has a damping function within the deformation range of the damping bag. The damping mechanism for the aircraft interior trim has the advantages of being good in damping effect, large in radial rigidity and axial rigidity, capable of being rapidly disassembled and assembled and the like.

The application provides a bolt connection strength simulation analysis method and system, relates to the technical field of simulation analysis methods, and comprises the following steps: respectively calculating the axial stiffness of a bolt and the compression stiffness of a connected part by adopting an axial elastic modulus method, constructing a parallel stiffness distribution model, and calculating additional tension of the bolt; respectively calculating axial tensile stress of the bolt and shear stress of the bolt by adopting an area uniform stress method; and calculating equivalent stress of the bolt by adopting a shear strain energy equivalent method; calculating a safety factor of the bolt by adopting an equivalent stress safety margin method, comparing the safety factor with a preset safety threshold, and outputting a corresponding bolt strength grade. Additional tension is dynamically distributed according to the stiffness of the bolt and the connected part, so that the force transmission characteristics are closer to actual bearing; the pitch correction nominal diameter is introduced, so that the actual stress distribution of the thread root is more accurately described; and the equivalent stress is calculated by the shear strain energy equivalent method, so that the yield criterion of the plastic material is more in line with the yield criterion.

The application discloses a damping and shearing prevention anchoring device for a short suspender and belongs to the technical field of bridge engineering, which comprises an anchoring assembly, a force transmission connecting component arranged in the anchoring assembly, an axial damping device and a radial damping device. The end of a suspender cable body is connected by the force transmission connecting component, and the axial damping and the radial damping of the suspender cable body after being fixed in the anchoring area are realized by the two damping devices. The damping and shearing prevention anchoring device for the short suspender changes the horizontal and axial rigidity of the suspender cable body in the anchoring area, can effectively reduce the vibration effect on the suspender in the axial and radial directions, reduces the vibration frequency of the suspender when the bridge deck vibrates, prevents the damage caused by the excessively large vibration frequency of the suspender, solves the damage problem of the anchoring area of the suspender caused by the long-term and repeated relative displacement of the suspender, reduces the replacement frequency of the suspender, prolongs the service life of the suspender and improves the safety and stability of the arch bridge, and has a good application prospect.

An axially clamped planar spline arrangement comprises a first component (10), in particular a constant velocity joint, with a first planar spline (11), a second component (20), in particular a wheel hub with a wheel bearing, with a second planar spline (21), wherein the first planar spline (11) and the second planar spline (21) are in meshing engagement with each other and are axially clamped together, and a snap-in sealing ring (40) which radially surrounds and seals the first planar spline (11) and the second planar spline (21) on their outer sides, wherein the snap-in sealing ring (40) is fixed to one of the first and second components and forms at least one locking lug (41a) which engages in one or more recesses (23) on the other of the first and second components.The snap-in sealing ring (40) has a circumferential sealing surface (46) on its axial end face, which, when the first and second planar serrations (11, 21) are in an axially play-free mounting position, seals against an elastic sealing element (50) that has a lower axial stiffness than the snap-in sealing ring (40). Alternatively, the sealing element (70) is designed as an axially extending extension (62) of a wheel bearing seal (60).

The application relates to a control handle and a conveying system, the control handle comprising a shell, two pull wire groups and a swing piece. When the catheter is located in an outer tube with a bending shape or in a blood vessel with a bending shape, the shell can drive the catheter to rotate around the central axis when the control handle is rotated in the circumferential direction, and the distal end of the catheter is connected to two connecting portions of the swing piece through the two pull wire groups, so that the control bending plane has greater axial rigidity, in other words, the catheter has greater torsional resistance at this time, the two pull wire groups of the catheter have two opposite tensile forces, the swing piece is deflected around the rotation axis, the tensile force of the pull wire group is balanced, and the torsional positioning of the distal end of the catheter is realized. Therefore, the torsional stability of the catheter is good, accurate positioning can be realized, and the success rate of the operation is greatly improved.

The application discloses a connecting arm axial rigidity adjusting method, which adjusts the axial rigidity of the connecting arm by changing the connecting length of a plate spring transversely connected between two connecting end faces of the connecting arm, characterized in that a plurality of limiting structures are arranged on one connecting face along the length adjusting path direction of the plate spring, and the limiting structures are used for realizing the step-by-step adjusting of the axial rigidity of the connecting arm. The application can realize the step-by-step adjusting of the axial rigidity of the connecting arm, and has the advantages of more stable and reliable rigidity adjusting, more convenient for beginners to master and use, and the like.