308 results about "Structural reliability" patented technology

The invention provides a finite element analysis method for a competition-level site cross-country motorcycle frame, and belongs to the technical field of crossing of computer-aided engineering and vehicle structure design. The method comprises the following steps: performing parametric modeling on a frame main bearing structure based on CATIA software, and simplifying non-functional characteristics; importing the model into ANSYS Workbench, generating a high-precision finite element model by adopting a grid division strategy of mixing tetrahedron and hexahedron units, and considering the calculation efficiency and precision; defining material characteristics; a limit load working condition is simulated through statics analysis, a displacement cloud picture and a stress cloud picture are combined to be compared with the yield strength of a material, and topological optimization is conducted on a weak area; meanwhile, the inherent frequency of the frame is extracted through modal analysis, and the resonance risk is avoided. According to the method, statics analysis and modal analysis are carried out on the frame through cross-platform co-simulation, the structural reliability is evaluated, and the method is suitable for efficient development and performance optimization of competition-level cross-country motorcycle frames.

The present invention relates to the technical field of surgical robots, and discloses a mounting mechanism and a surgical robot. The mounting mechanism is used to install a poking mechanism, and a mounting part is protruding from the poking mechanism. The mounting mechanism includes a mechanism body, an adapter, and a movable part. One end of the mechanism body is used to connect with the mechanical arm, and the other end is provided with a mounting channel; the adapter includes a receiving part, the receiving part is placed in the mounting channel and can be separated from the mounting channel through the opening of the mounting channel, one end of the receiving part is open, and the mounting part can enter or separate from the inner cavity of the receiving part through the opening of the receiving part, and a clamping part is movably provided on the side wall of the receiving part; the movable part is placed in the mounting channel and movably connected to the mechanism body, and when the mounting part is in the inner cavity of the receiving part, the movable part can push the clamping part to move toward the inner cavity of the receiving part to press against the mounting part. The present invention improves the structural reliability of the adapter, ensures surgical safety, reduces the processing and assembly requirements of the mounting mechanism, and reduces production costs.

The invention discloses an offshore wind turbine supporting structure reliability evaluation method based on a reduced-order digital twin model, and the method comprises the steps: obtaining the response data of an offshore wind turbine supporting structure through multi-dimensional load analysis; and finally, setting a limit state function of the offshore wind turbine support structure in an extreme state, and calculating the failure probability of the offshore wind turbine support structure through a first-order reliability method under the condition of combining response data of the offshore wind turbine support structure so as to evaluate the reliability of the offshore wind turbine support structure. According to the method, the problems of insufficient model precision, calculation efficiency bottleneck, reliability evaluation limitation and the like of an existing reliability evaluation method for the offshore wind turbine supporting structure can be solved, and the requirements of offshore wind power engineering for high precision, high efficiency and comprehensiveness of reliability evaluation of the supporting structure can be met.

The invention provides a structure reliability analysis method based on an adaptive variable fidelity model, and the method comprises the steps: generating an initial sample point set which is uniformly distributed and has representativeness through an improved random sampling method KMODMC, enabling the initial sample point set to comprise a low-fidelity sample set and a high-fidelity sample set, training a BP neural network through employing the low-fidelity sample set, and carrying out the training of the BP neural network through employing the high-fidelity sample set; a low-fidelity BP neural network model is obtained; meanwhile, based on an error training Kriging model of a high-fidelity sample set and a low-fidelity model predicted value, an error correction Kriging model is constructed, the low-fidelity BP neural network model and the error correction Kriging model are combined to form a multi-fidelity mixed agent model, and adaptive iterative optimization is performed through a double-model alternate point adding sampling strategy. And finally obtaining a high-precision multi-fidelity hybrid agent model for structural reliability evaluation. According to the method, the problems of high cost of high-fidelity simulation calculation and insufficient precision of a low-fidelity model are solved, and the adaptive capacity and prediction precision of the model in a complex nonlinear problem are effectively improved.

The invention relates to the technical field of hydroelectric power generation equipment structure reliability evaluation, and particularly provides a water turbine top cover bolt time-varying reliability evaluation method and device based on parameter sensitivity analysis. According to the technical scheme provided by the invention, key variables are highlighted through parameter sensitivity analysis, and the response surface method and Monte Carlo simulation are combined, so that the calculation efficiency is remarkably improved while the precision is ensured, and the reliability evolution rule of the bolt in the whole life cycle can be scientifically represented; and an important basis is provided for maintenance decision and structure optimization of the water turbine top cover bolt.

The invention provides a product structure safety evaluation method considering detection probability, which comprises the following steps of: automatically establishing a product finite element model in batches under different defect distribution by adopting a Monte Carlo method by constructing a joint probability model fusing defect existence probability and nondestructive testing detection probability indexes; calculating M integral and regularization damage parameter pi of the model under each defect distribution condition by combining material configuration mechanical energy intensity indexes, determining the influence rule of uncertainty on intensity index probability distribution, and establishing the incidence relation among the random defect distribution condition of the product, the mechanical performance and the structural reliability; and effective analysis and quality evaluation of product defects are realized. According to the method, a nondestructive testing detection probability POD evaluation system is creatively combined with the M integral and regularization parameters of the configuration mechanics, the limitation of a traditional reliability evaluation method is broken through, the influence of uncertainty on the structural strength is quantitatively detected, the precision and efficiency of product reliability evaluation are remarkably improved, and the method is suitable for popularization and application. And effective technical support is provided for structural safety design.

The invention provides an efficient and high-precision prediction method for the minimum failure probability of an aviation structure system based on an exponential penalty learning mechanism, and relates to the technical field of structural reliability analysis. Respectively generating an initial sample and a candidate sample according to the probability density function of the random variable of the performance function to be analyzed; real performance function responses corresponding to the initial samples are calculated to form an initial training sample set, and an initial Kriging agent model is constructed; selecting an optimal sample point from the candidate sample set through the proposed EPAL function; merging the optimal sample and the real response thereof into the initial training sample set, and iteratively updating the Kriging model until an error-based stopping criterion is met; judging whether the failure probability variation coefficient meets the requirement or not; and finally, calculating the failure probability of the structure based on a trained Kriging model and a Monte Carlo method.

The invention discloses an aircraft fuel centrifugal pump impeller parameterization design method, and relates to the technical field of aircraft fuel centrifugal pump impeller parameterization design, and the aircraft fuel centrifugal pump impeller parameterization design method comprises the steps that a point cloud conversion terminal carries out Poisson sampling on the surface of each impeller model, and a point cloud data set containing coordinates, normal vectors and curvatures is generated; in a physical constraint neural network architecture construction stage, a neural network terminal inputs working condition vectors and performance requirements into a PointNet + + encoder to extract global features, then geometric point cloud coordinates are generated by using Transform in combination with MLP, and eddy dynamics physical constraints including a vorticity intensity suppression item and a vorticity gradient constraint item are applied in training. According to the method, the multi-objective loss function combination is designed through the training optimization terminal, the point cloud geometric error, the fluid equation residual error and the performance index deviation are fused, multi-dimensional collaborative optimization of the geometric accuracy, the fluid mechanics compliance, the performance standard degree and the structural reliability of the impeller is achieved, and finally the aviation fuel centrifugal pump impeller with better comprehensive performance is obtained.

The assembled steel box girder comprises a first steel box girder and a second steel box girder, wherein the ends of the first steel box girder and the second steel box girder are in butt joint; a supporting beam is fixed in the first steel box beam, a cross rod is arranged on the surface of the supporting beam, a slidable telescopic arm is inserted into the cross rod, a jacking plate at the end of the telescopic arm is connected with an L-shaped rod, and a telescopic rod is inserted into the end of the L-shaped rod; through grooves matched with the L-shaped rods are formed in the surfaces of the two steel box girders, the telescopic rod on the first steel box girder side is sleeved with a rotatable nut, and the telescopic rod on the second steel box girder side is fixedly provided with a screw capable of being connected to the nut in a screwed mode. According to the scheme, the two steel box girders are driven to be in accurate butt joint through thread transmission, gaps are eliminated to improve the welding quality, and meanwhile the construction cost is reduced; the supporting beams and the transverse rods form a stable bearing foundation, the stability of the splicing process is guaranteed, construction efficiency and structural reliability are both considered, and the method is suitable for rapid splicing of bridge steel box girders.

The invention provides an intelligent detection method and system for absolute stress of a steering axle of a port machine, and relates to the technical field of stress measurement and detection. Carrying out synchronous correction and feature modeling on the collected data, and constructing an absolute stress calculation and intelligent analysis model; screening a structure benchmark operation interval based on the operation data, constructing a benchmark stress reference state, and evaluating the stability of the structure benchmark; on the basis, multi-axis decomposition is carried out on the absolute stress, a multi-axis stress decoupling coefficient is calculated, and multi-axis stress safety judgment and coordinated regulation are achieved; and further combining the stress time sequence evolution characteristics and the fatigue accumulation effect, evaluating the long-term stress evolution risk of the structure, and implementing steering, loading and maintenance strategies when the risk exceeds the limit. According to the method, online sensing, risk early warning and closed-loop optimization of the absolute stress of the steering axle are realized, and the operation safety and the structural reliability of the port machinery are improved.

The invention discloses a generative model and digital twinborn fusion aerospace equipment structure reliability test method, which comprises the following steps of: firstly, establishing a physical entity model of aerospace equipment, installing a sensor at a key position of the physical entity model, and acquiring stress, strain and vibration data of the equipment in real time; secondly, establishing a digital twinborn model corresponding to a physical entity, and determining a load-response relationship of equipment; processing the actually acquired data to form a standardized load-response data set; establishing and training a probability mapping relation between load and response by utilizing a diffusion generation model, and realizing the generation of equipment response data; then defining a limit state function of reliability analysis of the equipment structure, and carrying out reliability simulation evaluation to obtain a failure probability and a reliability index of the equipment structure; and finally, acquiring equipment operation response data in real time, and dynamically updating parameters of the diffusion generation model and the digital twin model. According to the invention, the accuracy and efficiency of aerospace equipment structure reliability testing are effectively improved.

This application relates to a horn-shaped twisted panel assembly for decorative purposes, belonging to the technical field of decorative materials. It includes a horn-shaped decorative panel with a reinforcing mechanism fixedly connected internally. The reinforcing mechanism includes a reinforcing frame, which is externally fixedly connected to the interior of the horn-shaped decorative panel. A honeycomb reinforcing plate is fixedly connected internally to the reinforcing frame, and a reinforcing support plate is fixedly connected to the bottom inner side of the reinforcing frame. A stabilizing support component is fixedly connected to the bottom of the reinforcing support plate. This application achieves a stable structural connection for the horn-shaped decorative panel through the synergistic action of the reinforcing frame, honeycomb reinforcing plate, and reinforcing support plate, effectively improving its compressive strength. The combination of bottom stabilizing columns, stabilizing ribs, and stabilizing rods enhances the stability of the decorative panel, improving its structural reliability and durability, reducing the risk of deformation and damage, and extending its service life.

The invention discloses a solid non-compact filling hydraulic support which comprises a base and a shield beam, the top of the base is connected with a top beam through two stand columns, a platform base is further installed on the base, a pedestrian passageway is formed between the stand columns and the platform base, one end of the shield beam is hinged to the top beam, the other end of the shield beam is connected with the platform base, and a balance oil cylinder is arranged below the connecting position of the top beam and the shield beam. Two ends of the balance oil cylinder are respectively connected with the top beam and the shield beam; the platform base comprises supporting legs and a horizontal platform, one end of the horizontal platform is connected with the supporting legs, the other end of the horizontal platform is overhung backwards, the tail of the horizontal platform is connected with a vertical lug, and the vertical lug is hinged to one end of the shield beam; a bottom discharging type conveying scraping plate is further laid on the horizontal platform, a hole is formed in the horizontal platform, and gangue is filled in a non-dense leaked gangue mode through a bottom discharging opening and the hole. The problems that in the prior art, due to the fact that a support is complex in structure, transportation and assembly are difficult, operation efficiency is low, and structural reliability and operation safety are poor are solved.

The utility model discloses a kind of broken ore double-beam head-and-back use hook anti-drop device, it is related to hook anti-drop device technical field, including hook main part, the sliding arc groove being opened in the both sides of hook main part, the anti-drop blocking half ring one and the anti-drop blocking half ring two slidingly connected in the inner wall of two groups of sliding arc groove, the auxiliary locking assembly being set to the outer wall of hook main part, the auxiliary locking assembly is used to lock the anti-drop blocking half ring one and the anti-drop blocking half ring two to make both with the detachable fixed connection of hook main part. The utility model is closed by the opening of hook main part by the anti-drop blocking half ring one and the anti-drop blocking half ring two along sliding arc groove sliding, cooperate the locking structure of threaded insertion rod and threaded positioning hole, form closed ring, can effectively prevent steel wire rope from detaching from hook due to shaking, vibration etc. in the process of lifting, solve the problem that traditional hook anti-drop structure is insufficient in reliability, especially applicable to broken ore scene frequently lifting, the environment of complex working condition.

The utility model discloses an oscillating fan, and relates to the technical field of blowing equipment, the oscillating fan comprises a support structure, a fan assembly, an oscillating device and a control module, the support structure comprises a support piece and a mounting piece, the mounting piece is connected to one end of the support piece, and two opposite sides of the mounting piece are respectively provided with a first support arm and a second support arm; the fan assembly is arranged above the mounting piece and is arranged between the first supporting arm and the second supporting arm, and the first supporting arm and the second supporting arm are rotationally connected with the two opposite sides of the fan assembly respectively; the head shaking device is arranged on the first supporting arm and / or the second supporting arm and is in transmission connection with the fan assembly so as to drive the fan assembly to swing up and down relative to the supporting structure; the control module is arranged on the installation piece and electrically connected with the head shaking device and the fan assembly. According to the technical scheme, the overall structural design of the oscillating fan is improved, and the practicability and the structural reliability of the oscillating fan are improved.

This invention discloses a multi-layered internal structure for shield tunneling based on a steel-concrete composite structure, including a flue slab, an upper lane slab, and a lower lane slab. The flue frame structure of the flue slab is connected to the steel plates pre-embedded in the corresponding tunnel segments, and the edges of the corresponding steel-concrete composite slab are sealed to the corresponding tunnel segments by cast-in-place concrete. The upper lane frame structure of the upper lane slab is fixed to the steel plates pre-embedded in the corresponding tunnel segments by multiple upper lane steel brackets. The lower lane slab has precast components at the bottom of the tunnel, with steel-concrete composite slabs on both sides, and the outer sides of the steel-concrete composite slabs are supported on steel longitudinal beams. The steel longitudinal beams are fixed to the steel plates pre-embedded in the corresponding tunnel segments by multiple lower lane steel brackets. During construction, the lower lane slab, upper lane slab, and flue slab are constructed sequentially from bottom to top, and finally the asphalt pavement layer is laid. The application of this invention reduces the self-weight, eliminates the need for rebar installation in tunnel segments, improves structural reliability and construction efficiency, and also frees up internal space in the tunnel.

The compression roller assembly of the vertical type circular mould granulator comprises an eccentric compression roller piece and an adjusting assembly, after a driving force is applied to an adjusting rod, a rotating shaft is driven to rotate through an adjusting plate, and the eccentric compression roller piece is driven to rotate through the adjusting assembly. A gap between the eccentric compression roller piece and a mold on the vertical ring mold granulator is adjusted; and a thinning groove is formed in the adjusting rod. Therefore, the thinning groove is formed in the adjusting rod, the structural strength of the adjusting rod on the part can be reduced through the thinning groove, and the adjusting rod is prone to breakage at the position of the thinning groove or near the position of the thinning groove after being subjected to external force exceeding the preset size; therefore, the eccentric compression roller piece or the mold can be prevented from being damaged due to continuous high-strength confrontation between the eccentric compression roller piece and the mold, so that the structural reliability of the eccentric compression roller piece and the mold can be improved, and the service life of the eccentric compression roller piece and the mold can be prolonged.

The invention relates to the technical field of oyster rafts, and discloses a manufacturing method of an HDPE (high-density polyethylene) tube oyster raft, which comprises the following steps: step S1, preparing materials; s2, assembling the frame main body; s3, the pipe fitting is subjected to polishing treatment; s4, performing hot melting welding; step S5, mounting a buoy; s6, transverse pipe fittings are laid; and S7, reinforcement treatment is conducted. According to the manufacturing method of the HDPE pipe oyster raft, by implementing standardized material preparation, frame main body assembly, pipe fitting polishing treatment, hot melting welding, buoy installation, transverse pipe fitting laying and reinforcement treatment processes, the problems of low pipe fitting connection precision, insufficient frame structure stability and poor wind and wave resistance caused by operation depending on experience in existing HDPE pipe oyster raft manufacturing are solved; by adopting the HDPE material, the problems of corrosion, heavy weight and high maintenance cost of the traditional wood and metal oyster rafts are solved, so that the quality consistency, the structural reliability and the service life of the oyster rafts are ensured.

The invention provides a combined type screw pump stator and a processing device and method for a lining layer of the combined type screw pump stator, and belongs to the technical field of screw pumps. The stator comprises a lining layer made of fiber reinforced composite materials, a metal outer layer wrapping the lining layer and connecting structures arranged at the two ends, and the connecting structures are mechanically connected with the inner layer and the outer layer at the same time and fixedly connect the inner layer and the outer layer into a whole. The machining device comprises a machine tool frame body, a first driving mechanism for driving the mandrel to rotate, a second driving mechanism for driving the winding mechanism to move in the axial direction of the mandrel, and the winding mechanism capable of precisely adjusting the fiber tension and the winding path. Through the unique composite structure design and mechanical connection mode, the problems that a traditional rubber lining stator is prone to aging and debonding and an all-metal stator is poor in sealing performance are solved, and the stator has excellent wear resistance and corrosion resistance and high structural reliability.

The utility model discloses a kind of split shaving cutter for machining gear, to solve the problem of high cost of traditional integrated structure, waste resources, realize tool body replacement alone, tool holder reuse, it includes tool body and steel tool holder, tool body coaxial sleeve is connected in tool holder, tool holder is equipped with root cleaning, first reference surface and the blocking ring of second reference surface with inclination, tool body is positioned by lower end face adhering first reference surface, connecting through-hole wall abutting second reference surface, and is connected with cooperation positioning bolt.The stress concentration is reduced by being equipped with avoidance ring groove, the stability of positioning member and positioning groove adaptation enhances, positioning member adopts rectangular part and semicircular part adhering structure, inside side angle is equipped with avoidance cutting surface to facilitate assembly and disassembly.The design reduces cost, improves machining precision stability and structural reliability, optimizes assembly efficiency.

The invention relates to the technical field of three-section hidden rails, in particular to a true synchronous three-section sliding rail assembly and a hidden sliding rail, the true synchronous three-section sliding rail assembly comprises a middle rail, a gear and two sets of outer rail components, the two sets of outer rail components are slidably assembled on the upper side and the lower side of the middle rail respectively, and each outer rail component comprises a U-shaped rail and a rack; the racks are connected to the inner wall of the U-shaped rail, the middle rail is provided with a cavity, the gears are rotationally assembled in the cavity, the gears are exposed out of the top and the bottom of the middle rail and used for being in meshing transmission with the racks of the two sets of outer rail components, the gears are arranged in the cavity of the middle rail, and the racks are directly fixed to the U-shaped rail. The problem of false synchronization or asynchronization possibly caused by traditional indirect transmission through a sliding piece is solved, synchronous movement of the movable rail and the fixed rail is achieved, it is guaranteed that the extending lengths of the sliding rails on the left side and the right side are consistent in the drawing process of the drawer, and the bearing capacity and the structural reliability of the sliding rails are improved.

The invention discloses an equal-groove-width variable-pitch engineering tire pattern structure giving consideration to low noise and full abrasion period equal saturation, and relates to the technical field of tires. The technical bottlenecks of single performance, inconsistent performance of each pitch, uneven abrasion, poor structural reliability and low universality in the variable pitch design of the traditional engineering tire are broken through, and through the integrated innovative design of the equal-groove-width foundation design, the density differentiation matrix solid salient points and the third-order universal pitch proportion, the variable pitch design of the engineering tire is achieved. The low noise, the performance consistency, the uniform abrasion and the structural reliability are synergistically considered, and the use requirements of heavy load and multiple working conditions of the engineering tire are comprehensively met.

The application relates to a high-voltage direct-current relay. The high-voltage direct-current relay comprises a pushing seat, a moving spring mechanism and a leaf spring located between the pushing seat and the moving spring mechanism and comprising a base and a spring arm connected to the base, the base is arranged on the pushing seat, the spring arm is in contact with the moving spring mechanism, the base comprises a fixed part and a protruding structure connected between the fixed part and the spring arm, the fixed part is connected to the pushing seat, the protruding structure protrudes towards the side of the pushing seat relative to the fixed part, and the side surface of the protruding structure away from the spring arm is in abutment with the pushing seat. The high-voltage direct-current relay can reduce stress at the abutment position of the protruding structure and the pushing seat, reduce the risk of damage or separation of the fixed part from the pushing seat caused by the stress conduction to the fixed part and the arching deformation of the fixed part, and is beneficial to improving the structural reliability of the high-voltage direct-current relay.

The utility model discloses a temporary fixing and correcting device for pneumatic jacking of a steel dome of a storage tank, belongs to the related technical field of fixing of the steel dome of the storage tank, and is used for auxiliary fixing after the steel dome of the storage tank is pneumatically jacked to a preset position. The temporary fixing and correcting device for pneumatic jacking of the steel dome of the storage tank comprises a steel support fixed in a concrete wall, a pressure-bearing ring fixed to the steel support and an anchoring part fixed to the pressure-bearing ring, the pressure-bearing ring comprises a supporting steel plate and a pressure-bearing ring plate, and the supporting steel plate and the pressure-bearing ring plate are welded and fixed to each other. The anchoring part comprises a long steel plate and a short steel plate which are perpendicular to each other, the short steel plate of the pressure-bearing ring is poured in an outer tank reinforced concrete wall, annular rotation is prevented, the rigidity and the load-bearing stress performance of the pressure-bearing ring are improved, and after the steel dome is pneumatically jacked to a preset position, the pressure-bearing ring plate is supported on the steel dome to play a temporary fixing role. And meanwhile, the reinforcing effect of the steel dome can be achieved after overall pouring is completed after gas jacking, and the structural reliability of the steel dome of the storage tank is improved.

This utility model discloses a spiral-grooved vibration-damping tapered shank cutting tool, relating to the technical field of BT-type tapered shank cutting tools. Specifically, it is a spiral-grooved vibration-damping tapered shank cutting tool, comprising a flange and a BT-type tapered shank. The surface of the BT-type tapered shank is provided with spiral grooves, which are filled with elastic damping material. This spiral-grooved vibration-damping tapered shank cutting tool, by designing spiral grooves in the BT-type tapered shank and filling them with elastic damping material, utilizes the multi-head spiral structure of the spiral grooves to disperse vibration energy in multiple directions. At the same time, the elastic damping material absorbs high-frequency vibrations through shear deformation. This "rigid-flexible composite" structural design solves the contradiction between vibration suppression and structural strength in BT-type tapered shank cutting tools, and also provides high structural reliability without affecting the original strength of the BT-type tapered shank. It offers a BT-type tapered shank cutting tool that combines high rigidity, good vibration reduction performance, and low manufacturing cost.

The application discloses a kind of adiabatic sealed storage tank and its installation method, storage tank includes tank wall and insulation box, gap, it further includes elastic anti-convection element, and limiting plug-in column;Installation method, by prior accurate positioning and fixed limiting column, then connect anti-convection element, finally utilize the mechanical limit of structure self and complete the blind pressure assembly of insulation box, the way of process, originally height dependent on the experience of construction personnel is converted into standard action by mechanical dimension control;The application relies on the side of insulation box close to tank wall directly to elastic anti-convection element exert normal compressive force, force elastic anti-convection element to produce transverse expansion deformation and extrude into the gap between adjacent insulation box inside;Not only realize the dense physical plugging of bottom gap, cut off the convection channel of gas flow, reduce thermal siphon effect, also simplify assembly alignment process by the cooperation of structure, enhance the overall thermal insulation sealing performance and structural reliability of enclosure system.

The present invention discloses a safe construction method for tunnel intersections and an auxiliary construction device. An excavation opening is reserved at the intersection of a main tunnel and an intersecting transverse tunnel, a temporary support structure is pre-arranged at the excavation opening, and the main tunnel support structure is first cast based on the temporary support structure. Then, the intersecting transverse tunnel is excavated and the lining structure is cast under the protection of the main tunnel support structure. The casting construction of the lining structure of the main tunnel adopts the coordinated cooperation of a flexible formwork and a main tunnel formwork trolley. The lining structure of the intersecting transverse tunnel is then cast by the coordinated cooperation of a telescopic formwork trolley, a telescopic assembled formwork and the main tunnel formwork trolley. The present invention realizes the "lining first, then excavation" type safe tunnel intersection entry construction with the help of a series of auxiliary construction devices such as flexible formwork and telescopic assembled formwork, which can greatly improve the construction safety and structural reliability of the tunnel intersection, and significantly improve the standardization and normalization of lining casting construction at the tunnel intersection position, and is suitable for the field of tunnel intersection construction.

The utility model belongs to the technical field of fireproof cables, and particularly relates to an elastomer composite fireproof cable for urban fire protection, which comprises a plurality of cable cores spliced into an inner core, the plurality of cable cores are distributed in a circumferential manner and are externally cylindrical, an insulating layer is arranged outside the cable cores, an inner armor layer is wrapped outside the insulating layer, and an outer armor layer is wrapped outside the inner armor layer. The outer part of the inner armor layer is wrapped with an inner buffer sheet; according to the utility model, through arranging the inner buffer sheets and the outer buffer sheets which are distributed circumferentially outside the inner armor layer, the buffer effect when the cable is pressed is realized through the interaction of the buffer grooves, the buffer ribs and the energy absorption grooves, and meanwhile, the buffer ribs which are arranged at intervals provide a moving space for bending of the cable, so that both buffer protection and flexibility are taken into consideration; besides, the inner buffer sheet, the inner armor layer and the outer buffer sheet are spliced in a staggered manner, so that the outer buffer sheet plays a role in limiting the inner buffer sheet, and the outer armor layer, the fireproof shielding layer and the outer surface layer are combined to form a complete and closed cable structure, so that the production convenience is improved, and the structural reliability is ensured.

The invention provides a power transmission line risk assessment method and system integrating structure reliability and analytic hierarchy process, and belongs to the technical field of power system safety and disaster prevention. The overall risk level of the power transmission line section in a specific disaster scene is determined through data preparation and evaluation system construction, standard tower type mechanical property calibration, parameterized load effect calculation, mechanical failure probability calculation, electrical risk index evaluation, heterogeneous index normalization fusion and comprehensive risk index aggregation. According to the method, accurate and efficient component-level reliability evaluation can be carried out on a large-scale line, key shortages in an evaluation system are solved, the evaluation system is more complete and closer to engineering practice, the scientificity and rationality of a final evaluation result are ensured, and the evaluation efficiency is improved. And decision support is provided for differentiated operation and maintenance, precise investment and disaster prevention and reduction of the power grid.

The application discloses a bionic variable stiffness interlocking structure suitable for a planetary lander and a preparation method, and relates to the technical field of deep space exploration. The bionic variable stiffness interlocking structure of the application reserves a gap, an auxiliary rib or a cylinder as a weak end, the weak part is preferentially dissipated damage under load, and the overall secondary stiffness change is realized through truss fitting and locking and compression. The application adopts a partition functional arrangement, uses a martensite dominant nickel-titanium alloy lattice support in a landing impact energy absorption part, relies on martensite reorientation to realize efficient energy dissipation, low residual strain and shape recovery, uses an austenite dominant nickel-titanium alloy lattice support in a main load bearing core area, and uses the high modulus and buckling resistance characteristics to guarantee the structure stiffness and stability. Through the collaborative combination of the two types of alloy units, the load bearing, buffering and adaptive variable stiffness integration are realized, the planetary landing process multi-load coupling working condition requirements can be effectively met, and the structural reliability and buffering performance of the lander under deep space extreme environment are improved.