290 results about "Cable net" patented technology

The invention relates to the technical field of building construction, and particularly discloses a high-efficiency and high-precision cable net lifting control system for an annular cable-supported grid structure and application of the high-efficiency and high-precision cable net lifting control system. A prestress applying and cable net shape control module; the circumferential cable detection module is used for acquiring a real-time 3D tensioning model of the circumferential cable, performing comparative analysis on the real-time 3D tensioning model and a preset real-time 3D model, evaluating a tensioning process state and generating a tensioning early warning signal based on an evaluation result; the tensioning speed adjusting module is used for analyzing the completed tensioning process, evaluating whether the tensioning process is caused by the tensioning speed or not, and adjusting the tensioning speed based on an evaluation result; according to the method, the radial cable prestress tensioning speed and the tool downward pulling force tensioning speed in the follow-up tensioning process are calculated and adjusted through the relation model, it is ensured that the cable net tensioning process is stable and accurate, and the reliability and accuracy of annular cable-supported grid structure cable net lifting construction are further improved.

The invention provides a spoke type cable-supported grid structure construction method and system based on force shape coordination, and relates to the field of building engineering construction. The method comprises the steps that a cable net shape distribution model is constructed; performing reverse force pushing and construction stage segmentation to obtain a plurality of expected construction stages and a plurality of expected form distributions; monitoring and acquiring first actual form distribution of the first expected construction stage, and performing cable net lifting and tensioning collaborative operation optimization in combination with second expected form distribution to obtain second optimal lifting and tensioning operation parameters; and the construction operation of the second expected construction stage is executed until the whole construction period is completed. The technical problem that the construction precision and the construction efficiency are affected due to the fact that synchronous operation of lifting and tensioning cannot be accurately controlled in a traditional construction method is solved, it can be ensured that each construction stage can accurately achieve the design target through accurate force shape coordination, synchronous control of lifting and tensioning operation and real-time monitoring and optimization adjustment, and the construction efficiency is improved. And the construction precision and efficiency are improved.

The invention belongs to the technical field of photovoltaic supports, and particularly relates to a photovoltaic flexible support which comprises two edge supporting pieces, at least two assembly fixing cables, an assembly bearing cable, at least two wind-resistant frames and a ground anchor mechanism, and under the action of the wind-resistant frames, the assembly fixing cables and the assembly bearing cable can form a stable cable net structure. When a wind load acts on the cable net structure, force is transmitted to the wind-resistant frame through the assembly fixing cable, and then the wind-resistant frame distributes and transmits the force to the assembly bearing cable and the ground anchor mechanism, so that the wind resistance of the photovoltaic flexible support can be improved; therefore, the wind load is effectively dispersed and directly guided into the ground, the large-amplitude flutter and distortion of the cable net structure under the wind pressure are further inhibited, and the dynamic stability and the anti-fatigue performance of the whole photovoltaic flexible support are improved.

The invention discloses a suspension cable soft platform formwork structure for silo conical shell construction and a construction method, and relates to the technical field of silo conical shell construction.The formwork structure comprises a suspension cable net system, a formwork supporting system and an intelligent monitoring system.The suspension cable net system comprises main cables and auxiliary cables which are orthogonally arranged; the main cables are radially distributed along the silo top of the silo body, and the auxiliary cables are annularly arranged along the silo top of the silo body in a closed mode. The formwork supporting system comprises an auxiliary scaffold board and a full supporting frame which are arranged in the suspension cable net system, the upper portion of the full supporting frame is of a circular truncated cone structure forming a silo conical shell, a conical shell side wall mold is arranged on the arc face of the circular truncated cone structure, and a conical shell silo top mold is arranged on the upper bottom face of the circular truncated cone structure. The intelligent monitoring system comprises a load sensor and a tilt angle sensor. According to the method, through dynamic coupling of the orthogonal suspension cable net and the modular supporting system and combination of an intelligent monitoring system, precise control over the construction process is achieved, the steel consumption is reduced, the construction period is shortened, and safety and adaptability are improved.

The invention relates to the technical field of photovoltaic equipment, and discloses a cable-supported marine photovoltaic floating system, which comprises floating units, a cable net structure, a frame structure and a mooring structure, the cable net structure comprises longitudinal cables and transverse cables, the longitudinal cables and the transverse cables intersect to form a grid shape, and the longitudinal cables and the transverse cables intersect and are fixed in the floating units; the outer ends of the longitudinal cables and the outer ends of the transverse cables are connected with the frame structure, the frame structure is connected with the mooring structure, and the mooring structure is used for keeping pretension of the transverse cables and the longitudinal cables. According to the scheme, the longitudinal cables and the transverse cables are stressed in a face mode, a traditional point stress mode is replaced, external force can be dispersed more evenly, the local damage risk is reduced, and high fatigue resistance is achieved; the longitudinal cables and the transverse cables are fixed through the floating units, relative displacement of the longitudinal cables and the transverse cables is avoided, the integrity of the cable net structure is guaranteed, the frame structure and the mooring structure fluctuate up and down along with stormy waves and adapt to dynamic changes of the cable net structure, and the stability and durability of the whole floating type offshore photovoltaic system in the complex marine environment are guaranteed.

The invention relates to a support-free construction method for single-circle pull-down of a radial multi-support cable-supported grid structure. The support-free construction method comprises the steps that firstly, a cable net is pulled and lifted till radial cables are anchored to a circumferential supporting structure; then, a single-circle pull-down tool cable is installed and tensioned at the annular cable clamp, and the annular cable is made to be at the designed elevation; then, the radial beams, the supporting rods and the radial cable clamps are hoisted one by one in blocks, the tool cables are synchronously adjusted and pulled down, and non-closure section first-batch ring beams which are arranged in a staggered and spaced mode are installed in a running water mode; and then the pull-down tool cable is released and removed, and the non-closure section rear batch ring beam and the closure section ring beam are sequentially installed. According to the method, support-free construction of the radial multi-support type cable-supported grid structure is achieved through the single-circle pull-down tool cable, the complex multi-circle pull-down procedure is avoided, the elevation of the annular cable is convenient to adjust and control, the cost of construction measures is reduced, single-truss hoisting is stable, radial cable clamps are convenient to install, and the design requirement that the radial prestress of a lower cable net is independently balanced by a circumferential supporting structure is met.

The invention provides a full-tension spoke type crossed cable truss structure system and a construction method thereof, and relates to the technical field of building structures, the full-tension spoke type crossed cable truss structure system comprises a first supporting column system, a second supporting column system, a first pressing ring beam, a second pressing ring beam, a first crossed cable net, a second crossed cable net, a first inner ring cable structure, a second inner ring cable structure, slings and a diagonal bridging, the first pressing ring beam is fixedly connected with the first supporting column system, one end of the second supporting column system is fixedly connected with the first pressing ring beam, the other end of the second supporting column system is fixedly connected with the second pressing ring beam, the first crossed cable net is connected with the first pressing ring beam and the first inner ring cable structure, and the second crossed cable net is connected with the second pressing ring beam and the second inner ring cable structure. The sling is connected with the first crossed cable net and the second crossed cable net, and the diagonal bridging is hinged to the first supporting column system and the second supporting column system. The method has the beneficial effects that compressive yield failure is avoided, the method can adapt to complex load conditions, the force transmission path is clear, and the rigidity requirement of a super-large-span structure is met.

The invention provides a large-opening spoke cable dome space structure system and a construction method thereof, and relates to the technical field of building structure construction.The large-opening spoke cable dome space structure system comprises a supporting column system, a ring beam, a single-layer spoke type crossed cable net, an inner ring cable and a multi-stage cable system structure; the multi-stage cable system structure comprises a first endless cable structure, a second endless cable structure, a third endless cable structure, a fourth endless cable structure, a first supporting structure, a second supporting structure, a third supporting structure, a fourth supporting structure, a first stay cable structure, a second stay cable structure, a third stay cable structure and a fourth stay cable structure. The supporting column system is fixedly connected with the ring beam, one end of the single-layer spoke type crossed cable net is hinged to the ring beam, the other end of the single-layer spoke type crossed cable net is hinged to the inner ring cable, the multi-stage cable system structure is hinged to the ring beam, one end of a first supporting structure of the multi-stage cable system structure is connected with the inner ring cable, and the other end of the first supporting structure is connected with the first ring cable structure. The overall rigidity is large, the anti-collapse capacity is good, the length of the pressing rod is effectively reduced, buckling is avoided, and the problem that arrangement of a cable truss structure is limited is solved.

The utility model relates to the technical field of railway engineering, and discloses a protective net used when dismantling a bridge across a railway, comprising a crossbeam and a steel cable net installed on the pier of the bridge to be dismantled; the pier of the bridge to be dismantled is used as a fulcrum to tension the protective net under the bridge body, and the protective net can buffer and descend when it catches the falling blocks, effectively reducing the impact effect and destructive force of the falling blocks. The protective net uses the piers and pier columns of the bridge to be dismantled as pillars, making full use of existing structures, which is convenient and fast. The protective net has the characteristics of simple structure, convenient assembly, low comprehensive cost, short installation and disassembly time, etc., and provides a simple and practical device for protecting the existing railway under the bridge to be dismantled.

The invention belongs to the field of reconstruction construction of fabricated buildings and public buildings, and particularly relates to a disengagement type internal force balance additional awning reconstruction structure suitable for an existing pedestrian overpass, which comprises a disengagement type additional space prestress tension cable net awning structure; the overground tensioning internal force balance structure is provided with an outer wrapping strengthening structure, a lateral force resisting transformation structure and a tensioning internal force cable-strut system balance structure which are arranged on the basis of an existing pier system. The outer wrapping strengthening structure is arranged on the existing pier column, and the lateral force resistance transformation structure is connected to the outer wrapping strengthening structure of the existing pier column. And the tensioning internal force cable-strut system balance structure is connected between the lateral force resistance transformation structure and the disengagement type additional space prestress tensioning cable net awning structure, and is configured to change the direction of the tensioning cable force of the upper disengagement type additional space prestress tensioning cable net awning structure and transmit the tensioning cable force to the overground tensioning internal force balance structure. The additional awning is separated from the existing bridge body, and additional influence is generated on the existing bridge body structure.

The invention discloses an inflatable antenna structure with a cable net type reflecting surface. The inflatable antenna structure comprises an inflatable ball body, a cable net reflecting surface structure, a fixed waistband and a circumferential inhaul cable adjusting device, the inflatable ball body is of a supporting structure, internal pressure is provided in an inflation mode, the geometric shape of the ball body is kept, a cable net reflecting surface structure is arranged in the inflatable ball body and used for reflecting electromagnetic waves, and a circumferential inhaul cable adjusting device is arranged in the circumferential direction of the cable net reflecting surface structure and used for adjusting the cable net reflecting surface structure. The circumferential inhaul cable adjusting device is used for adjusting the shape of a reflecting surface on the cable net reflecting surface structure, and the edge or the boundary of the inflatable ball body is fixedly connected through a fixing waistband. The cable net type reflecting surface structure is introduced into the spherical antenna, so that the adjustability of the reflecting surface of the inflatable antenna is remarkably improved, the surface shape precision of the reflecting surface can be controlled and adjusted, the reflection gain and the signal quality are further improved, the difficulty of the processing and manufacturing process of the reflecting surface is reduced, and meanwhile, the processing and manufacturing cost is also reduced.

The invention relates to the field of radio telescope structure analysis, and discloses a large-scale cable net supporting system radio telescope reflecting surface section correction method, which comprises the following steps: establishing a telescope cable net reflecting surface initial calculation model; calculating internal force and external force of the mass point; performing nonlinear static force calculation to obtain an equilibrium state model; calculating a main cable node space coordinate deviation between the equilibrium state model and the initial calculation model; reversely applying the obtained coordinate deviation to the initial calculation model, and updating the equilibrium state model; repeating the steps 3-5 to obtain model information in a reference state; calculating an ideal section size of each cable unit; the optimal ideal section size is matched for the cable unit in the cable unit section library; the initial calculation model is updated, and cable net section correction is completed. According to the scheme, initial form analysis of the cable net reflecting surface is carried out by utilizing a finite mass point method, and more uniform cable force distribution is realized by selecting a proper cable net section size in a given section library.

The invention provides an umbrella-like floating platform and a tensioning method thereof. The umbrella-like floating platform and the tensioning method are used for solving the problem that an existing floating platform is large in weight and high in manufacturing cost. Comprising a platform ring and a pressed ring which are arranged in parallel, and a plurality of side stand column buoys are vertically connected between the platform ring and the pressed ring; a central stand column is further arranged at the central axis of the platform ring and the pressed ring, the bottom end of the central stand column extends out of the lower end face of the pressed ring, and a plurality of first inhaul cables and second inhaul cables are arranged between the pressed ring and the top end and the bottom end of the central stand column respectively. The first inhaul cables and the second inhaul cables are arranged in an annular array mode along the central axis of the central stand column. By arranging the inhaul cables, the inhaul cable tension steel structure is pressed, a tension-compression balanced prestressed cable net system is formed, under the condition that the stress performance of the whole structure is kept unchanged, the steel consumption of the platform is remarkably reduced, the purpose of the lightweight structure is achieved, and then the manufacturing cost is reduced.

The invention discloses a multi-point supported bidirectional cable net structure photovoltaic system and an arrangement method, which are suitable for large-span photovoltaic arrangement of complex terrains such as mountainous regions and deserts. The system comprises lattice type supporting columns, ring beams, a bidirectional cable net and a photovoltaic module, wherein the bidirectional cable net is formed by staggering transverse and longitudinal steel cables, is anchored to the ring beams and forms a wind-resistant stable system with the supporting columns; the layout of the supporting columns generates a stepped height difference matching scheme based on a terrain self-adaptive algorithm, and the cable net pre-tightening force is optimized in combination with a dynamic wind load response algorithm; the inclination angle and the spacing of the photovoltaic panel are determined through an illumination efficiency algorithm, and a real-time monitoring module and a safety threshold model are configured to realize risk early warning; the span limitation of a traditional flexible support is broken through, the wind resistance stability and terrain adaptability are remarkably improved, the steel consumption and the construction period are reduced through modular construction, the service life of the system is prolonged by combining the self-cleaning coating and fatigue life evaluation, and the system is suitable for agriculture-light complementation, ecological restoration and other composite scenes.

The invention discloses a structure feature extraction and model correction system fusing convolution and a self-attention mechanism, relates to the technical field of structure engineering information, and aims at solving the problem that the structure feature extraction and model correction of a cable net structure can be realized by introducing a convolution-self-attention fusion mechanism and a double-domain consistency constraint optimization model in the whole process of cable net structure modeling, feature extraction and parameter correction. And the precision dynamic correction from the finite element simulation data to the actual measurement response data is realized. The output of the finite element modeling subsystem is used as a multilayer objective function, after the principal component screening subsystem extracts a sensitivity principal component, the system extracts a local correlation feature by using a convolutional neural network in a feature extraction stage, and then captures a global dependency feature by a self-attention mechanism, so that the model can pay attention to the micro-scale response of a local structure and also can pay attention to the global dependency feature. And the overall dynamic mode can be identified. Compared with a traditional mode, the disturbance consistency constraint and adversarial training mechanism is introduced, so that the network can still keep stable output under input disturbance.

The invention discloses an aircraft cable network layout determination method, device and equipment, a medium and a product. The method comprises the following steps: receiving a cable network layout editing request, and determining aircraft connector information according to an electrical schematic diagram corresponding to a first aircraft; receiving a contact editing operation, and generating an aircraft contact distribution table according to the contact editing operation and the aircraft connector information; receiving a cable editing operation, and generating a cable information table corresponding to the first aircraft according to the cable editing operation and the aircraft contact distribution table; and in response to the layout information generation request, generating cable network layout information corresponding to the first aircraft according to the aircraft contact distribution table and the cable information table, so as to produce a cable network of the first aircraft according to the cable network layout information. According to the technical scheme, the effect of determining the cable network layout information in the aircraft based on the electrical schematic diagram of the aircraft is achieved, and the efficiency of determining the cable network layout information is improved on the basis of reducing the error rate of the layout information.

The invention discloses a construction method of a curved-surface cylindrical cable-membrane composite structure system.The cable-membrane composite structure system is of a curved-surface cylinder structure with the middle concave inwards, a circle of the upper portion of the cylinder is of a steel truss structure, the upper portion of a cable net is connected with the steel truss structure, the cable net comprises a plurality of radial cables and annular cables, and the radial cables and the annular cables are arranged in a crossed mode to form grids; the construction method comprises the following steps that S1, the steel truss structure is installed, and an initial frame is formed; s2, an operation platform and a lifting tool frame are arranged, and a lifting point is set; s3, the radial cable and the lifting tool frame are connected and lifted to be separated from the ground; s4, a cable net lifting and tensioning scheme is determined, specifically, the cable net is lifted to the designed height in a staged mode, annular cables are synchronously installed, and radial cables are symmetrically tensioned in a staged and batched mode; s5, synchronously performing simulation calculation and analysis; and S6, based on the simulation calculation and analysis result, lifting and tensioning of the cable net are conducted, and finally cable net forming is completed. And S7, a membrane structure is installed, and the tension of the cable net is adjusted.

The invention provides a flexible anti-scouring and silting promoting system. The flexible anti-scouring and silting promoting system comprises a buoyancy flow blocking net and an anchoring system. The buoyancy choke net comprises a plurality of floating balls, a cable net and an anchoring system interface, the floating balls are connected to the cable net, and the anchoring system interface is arranged at the bottom of the cable net. The anchoring system comprises a plurality of anchoring parts, each anchoring part comprises a movable connecting structure, an anchoring rod and an anchoring claw, the movable connecting structures are arranged at the top ends of the anchoring rods, and the anchoring claws can be movably connected to the anchoring rods. The anchoring system connector can be movably connected to the movable connecting structure, and the anchoring part can fix the buoyancy flow blocking net to the seabed or the beach.

The invention discloses a multi-energy complementary ocean floating type power generation system which comprises a floating type wind power platform, a wave energy power generation device, a floating type photovoltaic platform array and a mooring device, and the floating type wind power platform is used for supporting and installing a wind generating set; the wave energy power generation device is arranged on the periphery of the floating type wind power platform, so that a protection water area is formed between the wave energy power generation device and the floating type wind power platform; the floating type photovoltaic platform array is arranged in a protection water area; according to the mooring device, the anchoring foundation, the underwater buoys, the main mooring cable and the branch mooring cables are used for constructing a mooring cable net, the floating type wind power platform, the wave energy power generation device and the floating type photovoltaic platform array are moored in one mooring cable net in a centralized mode, and by sharing the anchoring foundation and the main mooring cable, the number of anchor points and the total using amount of mooring materials are greatly reduced; the mooring structure is simplified, the manufacturing and mounting cost is reduced, and meanwhile the energy output efficiency of the whole system is improved.

The utility model relates to the technical field of cable net curtain walls, in particular to a vertical self-balancing double-curved-surface cable net curtain wall supporting device which comprises multiple stand columns, wind blocking cables, reverse arch cables and balancing cables, the wind blocking cables and the reverse arch cables are arc-shaped, and the multiple stand columns are perpendicular to the wind blocking cables and arranged in the length direction of the wind blocking cables; the length direction of the reverse arch cable is parallel to the length direction of the stand column, a jacking assembly is arranged between the reverse arch cable and the stand column and used for controlling the radian of the reverse arch cable, and a tension assembly is arranged between the end of the reverse arch cable and the stand column and used for adjusting the tension of the reverse arch cable. And the balance cable is used for controlling the structural stability between the two adjacent reverse arch cables. The supporting structure has the effects that the loading force on the supporting structure is reduced, and the curvature of the cable net face tends to be consistent with the curvature of the outer vertical face of the curtain wall.

The utility model discloses a flexible photovoltaic support wind-resistant stabilizing system in the technical field of photovoltaic power generation, which comprises an assembly cable and a bearing cable, a plurality of photovoltaic assemblies are mounted at the tops of the assembly cable and the bearing cable, and a plurality of side anchor piles are connected to the two ends of the assembly cable and the bearing cable. Side beams are connected to the sides, close to the left end side anchor pile, of the assembly cable and the bearing cable, side columns are connected to the sides, close to the right end side anchor pile, of the assembly cable and the bearing cable, a triangular support is arranged between the assembly cable and the bearing cable, and an upper wind-resistant cable and a lower wind-resistant cable are arranged in the middle and at the bottom of the triangular support correspondingly. And a V-shaped support is arranged between the upper wind-resistant cable and the lower wind-resistant cable. According to the utility model, through cooperative arrangement of the assembly cables, the bearing cables, the triangular supports, the upper wind-resistant cables, the V-shaped supports and the lower wind-resistant cables, the support system forms a bidirectional cable net structure, the torsional rigidity of the flexible photovoltaic support structure is improved, and the flexible support structure can be effectively prevented from being subjected to torsional damage under the action of wind load.

The invention relates to the technical field of cable-supported grid structures, and discloses a permanent cable net support hoisting method which comprises the following steps: hoisting a cable net to an initial mounting configuration; applying a pull-down force to the cable net through at least one measure cable; the inclination angles of the radial steel beams relative to the horizontal plane are changed by multiple times, and loads are applied to the radial cables in the cable net by the heat by multiple times; after the load is applied each time, the cable force of the measure cable is dynamically adjusted, so that the configuration of the radial cable is matched with a preset supporting rod or flying column connecting point, and connection is completed; and after all the connecting points are connected, the measure cables are dismantled, and final shape finding of the radial cables is completed. The invention aims to provide a construction method for mounting an upper steel structure on a flexible cable net based on load superposition and a mode of dynamically adjusting a pull-down tool cable, and solves the problem that a plurality of support radial units complete shape finding under the control of a single pull-down tool cable.

The invention provides a multi-stage combination automatic optimization method for a satellite three-dimensional cable network path, and the method comprises the steps: judging the membership of a cable binding support, a connector and a cabin plate through reading a satellite three-dimensional satellite model, and defining the attributes of a cabin penetrating hole and a cross-plate connection point; constructing a three-layer information table of a cable network, a cable bundle and a cable branch; selecting the longest different plate / same plate branch as a main branch according to cabin plates at the head end and the tail end of the branch; decomposing stage by stage according to the distribution of main and branch cabin plates, and performing path optimization by adopting a plate path optimization algorithm based on a Floyd algorithm, an intra-region path optimization algorithm and a region path optimization algorithm; the slave branch selects the nearest access point for optimization based on the main branch path; and circularly processing all the cable bundles to complete the path planning of the whole cable network. Therefore, automatic optimization of the three-dimensional cable network path of the satellite deck is realized, the problems of low efficiency and poor quality of manual design of a general module are solved, and the method is adaptive to a whole satellite and a multi-deck satellite with a single / multi-plane deck and has universality.

The invention discloses a high-altitude ultra-long and ultra-high steel member installation construction stability control method on a flexible cable net, which comprises the following steps: S1, a radial main beam is hoisted to the flexible cable net, and the lower part of the head end of the radial main beam is connected with a vertical main supporting rod; a plurality of vertical secondary supporting rods are evenly arranged on the bottom side of the radial main beam in the axis direction of the radial main beam at intervals. S2, the radial main beam is gradually lowered, and the tail end of the radial main beam is connected to the inner ring beam through a pin shaft; s3, the adjustable lateral cables connected to the two sides of the vertical main supporting rod in advance are preliminarily pre-pulled downwards, then the single steel component is gradually lowered, the vertical secondary supporting rod and the radial cables are sequentially connected through cable clamps, and the bottom end of the vertical main supporting rod and the inner side annular cable are sequentially connected through cable clamps; and S4, the adjustable lateral cable is connected, the telescopic length is adjusted, and the adjustable lateral cable is tensioned and fixed. The method can ensure that the steel member forms a stable structural system under the support of the cable net, a large amount of measure cost is reduced, and the mounting quality is improved.

The invention discloses an active turbulent flow type sand blocking system. The active turbulent flow type sand blocking system comprises a first turbulent flow belt, wherein the first turbulent flow belt comprises a first supporting column, a first cable net and a first wind resistance plate; the plurality of first supporting columns are arranged side by side into a plurality of rows and are distributed at intervals; the first cable net is connected between every two adjacent first supporting columns in each row; and a plurality of first wind resistance plates are arranged on each row of first cable nets, and the plurality of first wind resistance plates on each row of first cable nets are distributed between the adjacent first supporting columns at intervals. According to the active turbulent flow type sand blocking system, the turbulent flow field is constructed and formed through point vortexes formed at all the wind blocking plates, the turbulent flow field is used for achieving active turbulent flow on wind-sand flow, macroscopic ordered kinetic energy efficient dissipation is conducted on the wind-sand flow, and the purposes of effective interception and sedimentation are achieved.

The present invention relates to the field of radio telescope structure analysis, and discloses a method for tracking and analyzing the star of the active cable net reflector of the FAST telescope, comprising: step 1: establishing a dynamic relaxation method numerical model of the FAST cable net reflector structure; step 2: setting the accuracy limit of the telescope reflector, model parameters, and convergence conditions; step 3: identifying the main cable nodes within the irradiation range; step 4: calculating the radial distance from the main cable point to the working parabola; step 5: applying forced displacement to the lower end point of the lower cable; step 6: performing iterative calculation to obtain an equilibrium state model; step 7: repeating steps 3 to 6 until all main cable nodes to the working parabola meet the accuracy limit requirements of the telescope reflector; step 8: repeating the previous steps for tracking and analysis. The present invention innovatively adopts the dynamic relaxation method to perform star tracking and analysis, avoiding the problems of singular stiffness matrix and non-convergence of iteration when performing complex structure analysis using the traditional finite element method.

This invention relates to the field of shaking table testing technology and discloses an electromagnetic shock protection device suitable for large-scale shaking table tests. It includes multiple support columns spaced along the outer perimeter of the shaking table and a surrounding arresting cable net assembly. The support columns are equipped with pulley assemblies. The surrounding arresting cable net assembly includes steel cables and at least one set of electromagnetic arresting assemblies. The steel cables are wound around the pulley assemblies, and the ends of the steel cables are connected to the electromagnetic arresting assemblies. The electromagnetic arresting assemblies include a spool and a generator connected to the spool. The steel cables are connected to the spool, and the generator is electrically connected to a control device. The control device controls the damping force on the steel cables by adjusting the excitation current of the generator. This invention aims to solve the problems of existing mechanical or hydraulic arresting systems, which suffer from slow response and inability to adjust damping force in real time, resulting in a harsh shock protection process, high peak force, and potential secondary damage.

The invention belongs to the technical field of flexible photovoltaic supports, and particularly relates to a long-span photovoltaic flexible support which comprises two edge supporting pieces, at least two assembly fixing cables, an assembly bearing cable, a plurality of wind-resistant frames and a plurality of stable anchoring mechanisms. Due to the fact that the two ends of the assembly bearing cable are fixed to the two edge supporting pieces respectively, under the action of gravity, the middle of the assembly bearing cable can droop, the whole assembly bearing cable has a certain curvature, and the length of each wind-resistant frame is configured to be matched with a natural droop curve of the assembly bearing cable. Therefore, wind loads can be transmitted downwards more evenly and more efficiently through the wind-resistant frames, under the cooperation effect of the stable anchoring mechanisms and the wind-resistant frames, the bearing capacity of the whole cable net structure can be improved, and the large-span arrangement requirement is met.

The utility model provides an angle-adjustable roof cable net photovoltaic support system, which comprises a photovoltaic panel, high transverse cables, low transverse cables, high longitudinal cables and low longitudinal cables, and is characterized in that the two ends of the high transverse cables and the two ends of the low transverse cables are connected to a parapet wall through transverse adjusting devices; the high longitudinal cables and the low longitudinal cables are connected to the parapet wall through longitudinal adjusting devices, photovoltaic panels are obliquely installed between the adjacent high transverse cables and low transverse cables, the high longitudinal cables and the low longitudinal cables are perpendicular to the high transverse cables and the low transverse cables, and cross buckles are arranged at the crossed positions of the high longitudinal cables and the high transverse cables. A cross-shaped buckle is arranged at the crossed position of the low longitudinal cable and the low transverse cable, the high longitudinal cable is located below the high transverse cable, and the low longitudinal cable is located below the low transverse cable. The solar photovoltaic support is scientific and reasonable in structural design, stable in supporting, small in influence on a house body, high in practicability, capable of making adaptive changes according to the illumination incident angle, capable of improving the sunlight receiving rate of a photovoltaic panel and high in power generation efficiency.

The invention discloses a flexible cable net supporting structure for an offshore photovoltaic panel, and the structure comprises a cable net truss which comprises an upper-layer cable net unit and a lower-layer cable net unit, the upper-layer cable net unit and the lower-layer cable net unit are arranged at an interval from top to bottom, the upper-layer cable net unit and the lower-layer cable net unit are connected through a first supporting rod, and the upper-layer cable net unit is suitable for bearing a photovoltaic module; the upper-layer cable net unit comprises a plurality of upper chord cables which are arranged at intervals, and the lower-layer cable net unit comprises a plurality of lower chord cables which are arranged at intervals; the upper chord cable is of a concave structure so as to bear a downward load; the lower chord cable is of an upward convex structure and forms a reverse curvature with the upper chord cable so as to bear an upward load; and the frame truss is arranged at the peripheries of the upper-layer cable net unit and the lower-layer cable net unit and is used for fixing the upper-layer cable net unit and the lower-layer cable net unit. Through the reverse curvature design of the upper and lower double-layer cable nets and the frame trusses, the problem that a traditional single-layer cable net cannot adapt to the offshore bidirectional dynamic load is effectively solved.