38 results about "Stress mode" patented technology

The invention discloses a steel tower stress analysis method based on twinborn simulation, which relates to the technical field of structural mechanics simulation and comprises the following steps: constructing a high-precision simulation layer and a rapid calculation layer according to structural parameters and material parameters of a steel tower; inputting a preset multi-field environment condition and structure state combination into the high-precision simulation layer to generate a stress response result, extracting stress mode features, and generating a multi-field stress mode feature library; steel tower structure response data and environment data are collected and preprocessed to form observation vectors, the observation vectors are compared and matched with the multi-field stress mode feature library, and target stress mode features and corresponding simulation configuration parameters are generated; and inputting the target stress mode characteristics, the simulation configuration parameters and the observation vectors into a rapid calculation layer to carry out twinborn simulation calculation, and generating a stress distribution data set and a response index set. According to the method, the multi-field stress mode feature library is constructed, so that the problems of high computing resource consumption and incapability of effectively utilizing historical data are solved, and the computing efficiency is improved.

The invention discloses a method for accurately predicting upheaval deformation of adjacent tunnels caused by foundation pit excavation by considering the influence of soil friction, which comprises the following steps of: firstly, determining size parameters of a foundation pit and an existing tunnel and physical and mechanical parameters of the tunnel and a soil body, and determining a stress mode of the tunnel and a model sketch of interaction of the foundation pit and the tunnel; determining the additional stress of the tunnel; then establishing a total energy formula of a tunnel upheaval deformation system of a Pasternak foundation model considering soil friction, and obtaining a tunnel upheaval deformation w matrix analysis based on an energy variation principle; and finally, according to an Euler-Bernoulli beam theory, a bending moment expression and a shearing force expression of the tunnel are obtained. According to the method, based on the Pasternak foundation model, the influence of axial soil body friction of the tunnel on tunnel deformation is considered, so that the calculated data better conform to the measured value. The method is simple and practical in matrix analysis, and has guiding significance for predicting the upheaval deformation of the adjacent tunnel caused by excavation of the foundation pit.

The invention discloses an intelligent AI pressure test method, device and platform for a financial service system, and the method comprises the steps: obtaining a pressure test instruction inputted by a user, analyzing the pressure test instruction, and determining a target service system, a service scene and a pressure mode; creating a business scene map according to the target business system and the business scene, and creating a pressure generation model according to the business scene map and the pressure mode; controlling the pressure generation model to generate pressure data, and generating a simulation request according to the pressure data; sending the simulation request to a target service system, and obtaining real-time index data when the target service system executes the simulation request; and detecting the real-time index data to obtain a detection result, and generating a pressure test result according to the detection result. According to the invention, the business scene atlas is created through the target business system and the business scene, and the pressure generation model is created according to the business scene atlas and the pressure mode, so that the pressure test can fit the business scene, and the accuracy of the pressure test result is improved.

The invention discloses wearable auxiliary stress supporting equipment, and relates to the technical field of power assisting machinery, the wearable auxiliary stress supporting equipment comprises a box body, a lifting mechanism and a supporting mechanism, one side of the box body is provided with a strap, and the box body is internally provided with a cavity; the lifting mechanism comprises a bearing cable, a winding device and a connecting piece, one end of the bearing cable is connected with an output shaft of the winding device, and the other end of the bearing cable is connected with the connecting piece; the supporting mechanism comprises a rack assembly and a guide rail frame. One end of the rack assembly is hinged to the side wall of the guide rail frame. The guide rail frame is transversely arranged and located outside the box body, one end of the guide rail frame extends in the direction where the straps are located, a rope body of the bearing rope is movably arranged in the guide rail frame in a penetrating mode, and the connecting piece is located below the guide rail frame. A traditional upper limb direct stress mode is replaced, the fatigue degree of the upper limbs is reduced, and meanwhile the stability and safety of single-person moving operation are guaranteed.

The invention belongs to the technical field of machining, and particularly relates to an anti-deformation engineering mechanical structural component and a forming method thereof.The forming method comprises the steps that S1, a base material is selected and cut into a blank with the preset size, and after the blank is subjected to pre-oil treatment, the blank is machined through cold press forming to obtain a preliminary configuration; s2, the preformed blank is heated to 420-450 DEG C, heat preservation is conducted for 20-30 min, the blank is put into a mold with a subarea gradient cooling channel, and a dynamic pressure mode of prepressing, main pressing and pressure maintaining is adopted; a densified formed part is obtained; s3, heating the densified molded part to 460-480 DEG C, preserving heat for 1.5-2 hours, cooling the molded part to 200-220 DEG C along with a furnace when the internal stress value of the molded part is reduced to 120-150 MPa, adjusting the heat preservation time according to the real-time stress, and quickly cooling the molded part to room temperature in a manner of combining air cooling and water mist cooling; and S4, the size of the formed part is corrected, a bionic hollow grid reinforcing structure is machined on a key stress part, and finally the anti-deformation mountain bike structural part is obtained.

The application relates to a design and construction method for improving the stress state of a suspended concrete cutoff wall of a face slab rockfill dam on a deep overburden layer, belonging to the technical field of water conservancy and hydropower. The construction sequence is as follows: first, a first-stage dam body is constructed; second, a first-stage concrete cutoff wall located in a valley section and a second-stage dam body are gradually constructed along the valley to the two banks; third, a second-stage concrete cutoff wall with a bottom embedded in the bedrock of the two banks is gradually constructed along the bank slope to the valley; fourth, a third-stage concrete cutoff wall in the middle of the first-stage and second-stage cutoff walls is constructed; and finally, a face slab, a connecting plate, a toe plate and a peripheral joint with the face slab are constructed. The application innovatively proposes a construction scheme of sealing the cutoff wall after the completion of the dam body, solves the problem of the stress mode of a simply supported beam formed by the early construction of the embedded bedrock section, causes the bending deformation of the dam body filled in the later period under the action of the dead weight and the high stress problem, improves the stress state of the concrete cutoff wall, reduces the risk of damage and cracking, and effectively improves the safety margin of the cutoff system of the face slab rockfill dam under the complex geological conditions.

The application provides a fixing device for purlin with folded edge, which comprises a purlin support plate, a fastening assembly and a purlin support fastener, and the purlin support fastener locks the purlin with folded edge on the purlin support plate through the fastening assembly. The application optimizes the processing mode, fixing mode and stress mode of the purlin with folded edge. The purlin with folded edge does not need to be fixed by processing strip-shaped holes, thereby shortening the processing period, increasing the overall stress area and making the installation more stable. Meanwhile, the height of the purlin with folded edge is flexible and adjustable, thereby increasing the rotation angle and coping with more complex project environments.

The invention discloses a non-drilling-through type shearing resisting method and structure for fixing a profiled steel sheet of a steel-concrete structure, and the method comprises the following steps: a locking hole which does not penetrate through a steel base material is machined in the profiled steel sheet and the steel base material, and the locking hole is provided with an insertion section, an expanded base section and an extension section which are connected in sequence; a shear-resistant expanded-base anchor bolt is inserted into the locking hole to the bottom; and the locking nut is rotated to realize that the profiled steel sheet and the steel base material are pressed and fixed while the expanded-base petals are opened. According to the invention, a stress mode is converted into mechanical interlocking of'the locking hole and the anti-shearing expanded-base anchor bolt 'from friction holding of a shoot nail, a force value is increased by one order of magnitude, a damage mode is designed as that the expanded-base petals, the anti-shearing expanded-base anchor bolt and a steel base material almost reach the limit at the same time, and the material strength utilization rate and the safety are extremely high. The non-drilling-through type shearing resisting method can be matched with automatic equipment to achieve automatic machining.

The invention belongs to the field of cable performance detection, and discloses a system and a method for detecting the capability of bearing horizontal creep of a fault zone of a line cable, and the system comprises a first transverse platform, a second transverse platform, a first two-dimensional platform and a second two-dimensional platform for independent control of transverse and longitudinal displacement. The system can simulate displacements in different directions caused by horizontal creeping of fault zones with different widths, so that a stress mode generated by the cable to be tested under a real supporting condition can be accurately represented, and the stress distribution, bending deformation and stress change of a joint area of equipment can be kept consistent with that of engineering practice. Under controllable transverse and longitudinal displacement loading conditions, the cable to be tested can be stressed in a real supporting mode and a power-on operation condition, so that accurate simulation and verification of performance change of power transmission equipment in an actual engineering environment are realized.

The clamp comprises a support base, a supporting plate and a support top plate, the supporting plate is located between the support base and the support top plate and fixedly connected with the support base and the support top plate, and the support base, the support top plate and the supporting plate form a frame with an opening in one side. A support rod is fixedly installed on one side of the upper end of the support base. The clamp has the beneficial effects that the clamp assembly consisting of the upper clamp body, the lower clamp body, the wear-resistant clamping seat and the anti-slip rubber seat is arranged, so that the clamp structure adopts a hard clamping structure and a soft clamping structure which are matched with each other, and double clamping, anti-slip and limiting effects with different properties can be provided for the steel strand; meanwhile, the stress points and the stress modes are increased, the stability of the clamping effect is ensured, abrasion or falling is not likely to happen, and in addition, when the abrasion phenomenon happens, disassembly, assembly and replacement can be conveniently carried out.

The application discloses a concrete reinforced grid plate bridge deck and a design method thereof, and relates to the technical field of bridge construction. The design method of the concrete reinforced grid plate bridge deck comprises the concrete reinforced grid plate bridge deck, and the specific operation is as follows: the local stress mode of the bridge deck is changed from a large-span one-way plate mode to a two-way plate or a small-span one-way plate mode by using the grid structure formed by the transverse and longitudinal reinforcements with certain bending stiffness, so as to adapt to the local stress demand of the bridge deck. The concrete reinforced grid plate bridge deck and the design method thereof define the concrete reinforced grid plate bridge deck structure, independently make the reinforced grid plate bridge deck into an integral component from the previous bridge deck, reinforcement, transverse diaphragm plate and support structure, and meet the prefabricated assembly modular mode.

The application discloses a full-assembly building beam-column joint based on a bracket cantilever and belongs to the technical field of assembly building structures. The full-assembly building beam-column joint comprises a prefabricated vertical column, a prefabricated bracket and a prefabricated beam, the prefabricated bracket is arranged on the side wall of the prefabricated vertical column, and the end of the prefabricated beam is supported on the prefabricated bracket; a force transmission mechanism is further arranged, one end of the force transmission mechanism is connected with the end of the prefabricated beam, the other end of the force transmission mechanism penetrates through the prefabricated vertical column and is connected with a dispersion plate opposite to the prefabricated vertical column, and the cantilever stress generated by the prefabricated beam is transmitted and dispersed to the vertical surface opposite to the prefabricated vertical column. The full-assembly building beam-column joint changes the unilateral stress mode of the traditional bracket joint, realizes balanced stress of the full cross section of the vertical column, effectively reduces stress concentration of the joint, and is convenient to assemble, reliable in stress, and strong in integrity.

The invention discloses a clamp device and a test method suitable for a bending fatigue test under displacement control of a T-shaped joint. Belongs to the field of welding structure fatigue performance testing. Comprising an upper clamp, a lower clamp and a plurality of bolts, a cylindrical structure arranged at the bottom of the upper clamp is in contact with an upper plate positioned in the middle of the T-shaped joint test piece, and the center of the cylindrical structure is offset from the central axis of the T-shaped joint test piece, so that the upper clamp forms eccentric loading in the process of moving downwards along with the hydraulic wedge block, and the lower clamp is rigidly connected with the T-shaped joint test piece through a plurality of bolts. Through reasonable structural arrangement, the upper clamp can accurately transmit displacement; meanwhile, the real stress mode of the test piece under the bending load is ensured through the high-rigidity constraint of the lower clamp. The objective of the invention is to improve the loading stability and the displacement control precision and ensure the true and reliable stress distribution, so that the accuracy and repeatability of the bending fatigue test of the T-shaped welding structure are obviously improved.

This invention discloses a spatial steel structure with bidirectional cantilever support for the roof, belonging to the technical field of large-span spatial structures. It solves the problem in existing technologies of determining which spatial structure style can effectively improve the stress mode of the horizontal load-bearing components of the roof and enhance the overall structural economy and rationality for large-span spatial structures with bidirectional concave roof features. The spatial steel structure of this invention includes a cantilever truss arranged along the long direction of the roof and two continuous cantilever beams arranged along the short direction of the roof. The two ends of the cantilever truss are supported by support columns, the middle of the two continuous cantilever beams are connected to the cantilever truss, and the ends of the two continuous cantilever beams are supported by supports, forming a herringbone shape. This bidirectional cantilever support spatial steel structure can be used for roof support of large-span spatial structures with bidirectional concave roof features.

The embodiment of the invention provides a visualization method for multi-model stress comparative analysis and related equipment, and belongs to the field of stress analysis and the field of data visualization. The method comprises the steps of obtaining a design scheme; converting the node stress data into stress body data; automatically grouping voxels with similar stress modes in different design schemes according to stress body data; performing tree view display: adopting hierarchical tree layout, organizing a plurality of schemes generated in an iterative design process, and providing volume rendering based on a stress value or a stress difference value; and performing comparison view display: arranging voxel groups obtained by segmentation according to rows by adopting matrix layout, arranging different design schemes according to columns, and simultaneously realizing stress comparison analysis among multiple schemes and local stress analysis in a single scheme through visual comparison among rows and columns. According to the method, the stress mode or the stress difference mode in the design scheme is extracted, the overall stress mode and the local stress mode are considered, and engineers are helped to better execute decisions.

The utility model discloses a heat supply pipeline repairing device for heat supply engineering, which relates to the technical field of pipeline repairing, and comprises a cladding pipe formed by oppositely enclosing a pair of semicircular sleeves, and an extrusion pad arranged along the circumferential inner wall of the sleeves and provided with an arc-shaped bulge arranged at the axial center position of the extrusion pad, a pair of infolded bulges obliquely arranged at the edges of the two sides of the extrusion pad, and a pair of arc-shaped bulges arranged at the axial center position of the extrusion pad. The inclined directions of the two convex parts face the axial center of the infolding bulge; the device has the beneficial effects that when the leakage point of the heat supply pipeline is repaired, the device can promote the repairing pad to apply laterally concentrated extrusion force to the leakage point from the two sides of the leakage point through the mutual matching of the extrusion pad in the sleeve and the stress part on the repairing pad, and the unique stress mode can effectively overcome interference caused by the uneven surface of the pipeline; and the attaching tightness degree of the repairing pad and the outer wall of the heat supply pipeline is remarkably improved, so that the sealing effect is greatly enhanced, the heating medium leakage risk is reduced, and the overall repairing effect is improved.

The utility model discloses an air valve assembly which is connected to a shock absorber, the shock absorber comprises a track, a roller, a pin roller, a shear shank, an upper cover plate, a lower cover plate, an air bag, an air pipe and a damper, and the air valve assembly is characterized by comprising a valve body, a valve rod, a sealing ring, a connecting piece, a fixing piece, a fixing support, a connecting shaft, a sliding piece, a locking bolt and a gasket; the axis of the valve body is parallel to the lower cover plate, the air valve assembly is connected to the lower cover plate of the shock absorber in parallel through the fixing support, and a sliding piece on the air valve assembly is perpendicularly connected with a pin roller on the shock absorber. By the adoption of the air valve assembly and the placing mode, the stress mode of an existing valve rod can be changed, lateral stress of the valve rod is changed into axial stress, lateral acting force borne by the valve rod is weakened to the maximum extent, and the problem that a sealing ring of an existing shock absorber height control valve is seriously abraded is solved as much as possible.

The present application relates to a kind of transformer air cushion vehicle tray and its design method, comprising the following steps: the overall structure of tray is regarded as continuum, and continuum is decomposed into discretization structure;For each unit in discretization structure, stress analysis is carried out, and all units in discretization structure are fused, and then the stress deformation result of the overall structure of tray is obtained;According to the stress analysis of each unit and the stress deformation result of the overall structure of tray, discretization structure is optimized, and the optimized tray structure is obtained.The present application optimizes structure, improves stress mode, avoids fatigue failure between the components of tray caused by excessive bending moment;Computer simulation method is used instead of test verification, problems are found in simulation process, and then optimization design is carried out, to improve the efficiency and quality of design.The present application optimizes the problem of unreasonable material use in actual structure design, and reduces material use cost.

The utility model belongs to the technical field of automobile parts, in view of the prior art problem, automobile shock absorber and steering knuckle double -screw bolt connection, bolt is axial fastening and circumferential shear resistance, is easy to fail because of vibration, and needs to control four hole tolerance, small space is difficult to assemble, is difficult to satisfy high reliability, high efficiency demand deficiency, provides a kind of shock absorber and steering knuckle mounting structure. The sleeve on the brake with steering knuckle assembly is connected to the lower end of the shock absorber cylinder with helical spring assembly, the side of the positioning sleeve is vertically provided with an open crotch, the open crotch is provided with a mounting bolt on one side and is threaded with a nut on the other side; an interlocking mechanism is arranged between the inner peripheral wall of the positioning sleeve and the outer peripheral wall of the shock absorber cylinder, and the interlocking mechanism is used to bear the circumferential shear force of the shock absorber cylinder in the positioning sleeve. The application breaks the traditional double-bolt "one bolt two use" composite stress mode, realizes the function separation of "circumferential shear resistance" and "axial fastening" through structure optimization, and solves the bolt failure problem from the root.

The invention provides a high-stress track extraction method of a joint type mechanical device. The method comprises the following steps: acquiring an n-dimensional stress vector; performing dimension reduction processing on the n-dimensional stress vector to obtain a k-dimensional feature vector; generating a stress level index according to the n-dimensional stress vector, wherein the stress level index is used for measuring the overall stress of the articulated mechanical device; obtaining a target stress section of the articulated mechanical device in the operation process according to the stress level index; constructing a stress distribution model, wherein the stress distribution model comprises a stress amplitude distribution model and a stress mode distribution model; and determining and generating a high stress track sequence for the acceleration test of the articulated mechanical device according to the stress distribution model.

The application discloses a double-bucket reclaimer chain wheel adjusting device, which comprises a chain wheel and a chain wheel base, and the chain wheel base is connected to the main support of a girder through a forward and reverse screw rod. The double-bucket reclaimer chain wheel adjusting device changes the fixed position and structure of the double-bucket reclaimer chain wheel adjusting device, changes the stress mode of the chain wheel base, reduces the stress moment, thereby reducing the acting force of the welding point, reducing the occurrence of the chain wheel base being pulled apart, prolonging the service life of the equipment, and the forward and reverse screw pipe is more stable and convenient than the original screw rod nut in adjusting the chain wheel, the production efficiency of the double-bucket reclaimer is improved, and the production is ensured.

The utility model provides a clamping sleeve type connecting structure which comprises a nut, a clamping spring and a connecting pipe, an inner ring and an outer ring are arranged at one axial end of the connecting pipe, the axial length of the outer ring is smaller than that of the inner ring, and an inserting groove for a pipe to be inserted in is formed between the inner ring and the outer ring; the nut is connected with the outer ring in a threaded fit mode, a first inclined face is arranged on the inner wall of the outer ring, a second inclined face opposite to the first inclined face is arranged on the inner wall of the nut, and the end faces of the two axial ends of the clamping spring make contact with the first inclined face and the second inclined face respectively. During butt joint, the two axial ends of the clamping spring are jacked and pressed by the first inclined face and the second inclined face, so that the clamping spring mainly generates radial contraction force to tightly hold a pipe, the stress mode effectively prevents axial thrust from being generated on the surface of the pipe, and therefore the risk that an oxygen barrier layer is damaged is greatly reduced.

The invention provides a bottom lifting mechanism and a hydraulic support. The bottom lifting mechanism comprises a bottom lifting base; the connecting shaft is rotatably installed on the bottom lifting base, the bottom lifting jack is fixedly connected with the connecting shaft, and the bottom lifting jack can rotate around the connecting shaft relative to the bottom lifting base; the first limiting piece is connected with the bottom lifting jack; and the second limiting piece is connected with the bottom lifting base, and the second limiting piece is matched with the first limiting piece to limit the bottom lifting jack. By arranging the connecting shaft, the whole bottom-lifting jack obtains the degree of freedom of rotating around the shaft, the stress mode of the bottom-lifting jack is changed, the bending moment borne by the bottom-lifting jack is transmitted to the second limiting piece from the first limiting piece, and therefore the bottom-lifting jack is not stressed, transverse torque generated to the bottom-lifting jack when the push rod is retracted can be prevented, and the service life of the bottom-lifting jack is prolonged. Therefore, the bottom lifting jack is bent.

The utility model discloses a submersible pump suspension device, relates to suspension device technical field, including square tube, bottom plate, slide bar and hook, said square tube both ends are provided with bottom plate, the surface of bottom plate is provided with hole slot, bottom plate is used for fixing to the mounting point to support square tube both ends, the top surface of bottom plate is welded with the square tube end portion, and the bottom plate is provided with the hole slot. The stress mode is changed into the mode that the whole square pipe beam is stressed, the two ends of the square pipe beam are integrally welded to the stainless steel bottom plate and fixed to a building through stainless steel screws, the stress area is increased, stainless steel materials are not prone to corrosion and breakage, and meanwhile through the arch-shaped structure at the bottom of the square pipe, stress can be effectively dispersed to the two ends when the submersible pump is hung on the square pipe. Pressure is prevented from being concentrated in the middle of the square tube, so that the stability and the bearing capacity of the structure are improved, the middle of the square tube is prevented from being stressed and bent due to long-time use, and the service life of the suspension device is prolonged.

The utility model relates to the technical field of bridge maintenance, in particular to an under-bridge reinforcing structure for improving the overall stress performance of existing hollow slabs, which comprises a composite fiber grid arranged at the bottoms of the hollow slabs and used for connecting the hollow slabs into a whole. The fixing assemblies are used for fixing the composite fiber grids to the bottoms of the hollow slabs, and the grid bonding layers are used for wrapping the fixing assemblies and the composite fiber grids and bonding the fixing assemblies and the composite fiber grids to the bottoms of the hollow slabs. After the composite fiber grids are fixed to the bottoms of the hollow slabs, the composite fiber grids, the fixing assemblies and the hollow slabs form an integrated structure through the grid bonding layers, the integrated structure can be mutually restrained in the longitudinal direction and the transverse direction, and therefore the effect of bidirectional joint stress is achieved; the existing hollow slab is reinforced to form an integral slab stress mode under the action of an automobile load, and the integral stress performance and durability of the hollow slab are greatly improved.

The utility model provides a range hood, which relates to the field of kitchen appliances, and comprises an air duct and an air duct shell, an adjusting component is arranged between the air duct shell and the air duct, and the adjusting component can adjust the stress mode of the air duct so as to adjust the vibration frequency of the air duct. According to the extractor hood, the stress mode of the air duct is adjusted through the adjusting assembly so as to adjust the vibration frequency of the air duct, the problem of abnormal noise generated by resonance of the air duct of the extractor hood and the motor can be completely solved, and the user experience feeling is improved.

The utility model relates to a novel roller bearing seat which comprises a bearing upper cover, a base and fastening bolts, the bearing upper cover and the base are connected through the fastening bolts, a shaft body is arranged between the bearing upper cover and the base in a penetrating mode, sealing structures are arranged among the shaft body, the bearing upper cover and the base, and the fastening bolts comprise the first fastening bolt and the second fastening bolt. An included angle is formed between the axis of the first fastening bolt and the vertical line. The bolt has the advantages that a traditional stress mode is changed, when the bolt bears external force, the external force can be decomposed into a composite form of shear force and tensile force, the bolt is stressed more evenly, damage caused by too large single stress is avoided, and the bearing capacity is remarkably improved.

The invention discloses a suspension system for a mining dump truck and the mining dump truck. The suspension system comprises a guide mechanism and a hydro-pneumatic spring. The guide mechanism comprises an upper longitudinal thrust rod and a lower longitudinal thrust rod, one end of the upper longitudinal thrust rod and one end of the lower longitudinal thrust rod are hinged to an axle located below the frame, and the other end of the upper longitudinal thrust rod and the other end of the lower longitudinal thrust rod are hinged to the frame. The upper longitudinal thrust rod comprises a first upper longitudinal thrust rod and a second upper longitudinal thrust rod, and the lower longitudinal thrust rod comprises a first lower longitudinal thrust rod and a second lower longitudinal thrust rod; the distance between the two ends, close to the axle, of the first upper longitudinal thrust rod and the second upper longitudinal thrust rod is smaller than the distance between the two ends, close to the frame, of the first upper longitudinal thrust rod and the second upper longitudinal thrust rod, and the distance between the two ends, close to the axle, of the first lower longitudinal thrust rod and the second lower longitudinal thrust rod is equal to the distance between the two ends, close to the frame. According to the method, the motion trail of the axle under the complex road condition is effectively controlled, the lateral displacement amount is reduced to a theoretical zero value, and abnormal abrasion of tires is remarkably reduced. The axial stress mode of the hydro-pneumatic spring reduces the abrasion rate of the sealing structure and prolongs the service life.

This invention relates to a method for modeling the stiffness of a variable cross-section robotic arm link in relation to structural dimensions. The method includes the following steps: Step 1: Dividing the robotic arm link into a connecting rod section and front and rear connecting sections; Step 2: Equipping the connecting rod section as an Euler-Bernoulli beam and deriving its stiffness matrix using the principle of virtual work. The connecting rod section model is divided into tension / compression, bending, and torsional stress modes. The stiffness matrix for each stress mode is calculated, and the bending stress mode matrix is ​​corrected before being integrated with other stress mode matrices to obtain the connecting rod section stiffness matrix K2. The parameters in K2 are then correlated with the actual cross-sectional dimensions of the connecting rod section; Step 3: Extracting the stiffness matrices K1 and K3 of the front and rear connecting sections using finite element analysis software; Step 4: Converting and superimposing K1, K2, and K3 to obtain the robotic arm link stiffness matrix; Step 5: Using this method to guide the design of the robotic arm link. The stiffness model established by this invention is accurate and fast in calculation, facilitating dimensional optimization and quickly obtaining design dimensions that meet stiffness requirements.

The embodiments described herein provide a propulsive landing rocket landing leg system that provides for a high probability of a successful landing across wide stress and flow regimes due to the mechanism's ability to be implemented across a variety of compact and aerodynamic landing leg geometries. It provides for the ability to control unfolding speed for increased stabilization and removes unfolding dependence on the assistance of the gravitational force or separate “forced” actuating deployment sub-systems. The utilization of both rotational and linear damping units provides higher flexibility in the sourcing of lower cost components promoting higher cost-efficient construction and ease of parameter adaptation for the respective dynamics of the mechanism. The structural arrangement of the components allows for favorable distribution of stress, and in turn high stress tolerance due to the collaborative efforts of the parallel linear rod shafts and the landing leg structure, thus effective management of bending and other stress modes. Corresponding landing legs and methods are disclosed.