67 results about "Axial rigidity" patented technology

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.

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.

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.

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 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 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.

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.

The invention provides a torsion beam hydraulic bushing, and belongs to the technical field of automobile parts. The torsion beam lining solves the problem that an existing torsion beam lining cannot adjust the curve interval of axial rigidity. The torsion beam hydraulic bushing comprises a hydraulic assembly, an elastic assembly, a lower cover plate, an upper cover plate, a rubber body, a rigid block and a preset distance. In the invention, when a vehicle runs and the shaft body drives the upper cover plate to move towards the lower cover plate along the central axis of the bushing, the rubber body is stressed and deformed, the upper cover plate is subjected to the counter-acting force of the rubber body, and when the upper cover plate extrudes the rigid block, the axial rigidity of the rubber body is suddenly increased, namely, the axial rigidity of the rubber body is suddenly increased. The ratio of the counter-acting force to the downward moving distance of the upper cover plate is increased, the rigidity curve is steeped, the upper cover plate enters a non-linear section, in other words, the upper cover plate is not prone to descending, the rubber body is not prone to deformation, and therefore the rubber body can brake the moving distance of the shaft body more rapidly.

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.