38results about How to "Force analysis is simple" patented technology

The invention discloses a prefabricated bearing platform mounting method and relates to the field of bridge construction. The prefabricated bearing platform mounting method comprises the following steps that a bearing platform and bottom pier bodies are prefabricated in a prefabrication field, and steel pile hole positions are reserved in the bearing platform; the bearing platform is lifted to a pile site by a large floating crane; a pile top guiding device is pre-mounted on steel piles in the pile site before the bearing platform is lifted; after the bearing platform is lifted down and is in place, a carrying pole is arranged on a pile top longitudinal direction adjusting position in a hanging manner, and the horizontal plane of the bearing platform is regulated as required; and the pouring of bottom-sealing concrete of a steel cylinder cofferdam, the water pumping, the binding of reserved hole steel reinforcing bars, and the pouring of reserved hole concrete at non-lifting points and lifting points are sequentially finished, and the steel cylinder cofferdam is detached, so that the mounting of the prefabricated bearing platform is finished. According to the prefabricated bearing platform mounting method disclosed by the invention, a small steel cylinder cofferdam replaces a large bearing platform steel cofferdam, so that the steel material can be effectively saved, the on-water operation time is shortened, and the construction cost is reduced; and meanwhile, the influence of water flow to the construction of the bearing platform is reduced, and the construction quality of the bearing platform is ensured.

The invention discloses a power transmission tower pole stress calculation method based on finite element analysis. The power transmission tower pole stress calculation method comprises the following steps: establishing a finite element mechanical model of a tower structure by utilizing a finite element method, and carrying out discretization of an integral structure according to the composition of the tower structure; generating an element rigidity matrix for each element, and overlapping the element rigidity matrixes to generate an integral rigidity matrix in combination with a space angle relationship and a connection relationship among various poles in the tower structure; then, generating a load array according to a load borne by the tower, and constituting a matrix equation by a node displacement array as an unknown quantity, the integral rigidity matrix and the load array; finally, acquiring a node strain by solving the matrix equation, and finally acquiring the stress of each pole in the tower structure. According to the power transmission tower pole stress calculation method, the power transmission tower pole stress is accurately solved directly by a mathematical method, and a scientific basis is provided for safety evaluation of the tower structure.

Traditional power grid topology can only reflect connections of geography position nodes on two-dimensional plane and can not dynamically show relations between quantities of state. By using the power grid-elastic mechanics network topology mapping method of the invention, the power grid can be mapped to a three-dimensional expansion arrangement and longitudinal bearing elasticity network, which maintains an original topology connection state of the power grid and shows a physical property of power angle. An actual measurement quantity of state of wide-area measurement system (WAMS) is put into the elasticity network model mapped by the method of the invention. Power grid power angle state changes can be visually showed through an elasticity network deformation so as to get rid of dependence on element parameter accuracy. Anticipation ability of the power grid state changes can be raised. The invention possesses practical significance for realizing power grid visualization intelligence analysis and control.

Traditional power grid topology can only reflect connections of geography position nodes on two-dimensional plane and can not dynamically show relations between quantities of state. By using the power grid-elastic mechanics network topology mapping method of the invention, the power grid can be mapped to a three-dimensional expansion arrangement and longitudinal bearing elasticity network, which maintains an original topology connection state of the power grid and shows a physical property of power angle. An actual measurement quantity of state of wide-area measurement system (WAMS) is put into the elasticity network model mapped by the method of the invention. Power grid power angle state changes can be visually showed through an elasticity network deformation so as to get rid of dependence on element parameter accuracy. Anticipation ability of the power grid state changes can be raised. The invention possesses practical significance for realizing power grid visualization intelligence analysis and control.

The invention discloses a periodontal ligament stress analysis method and device. The method comprises the following steps: 1, obtaining geometric models of a digital tooth model, a digital periodontal ligament model and a digital alveolar bone model; selecting the types of constitutive models of the three models to form a digital dental model; selecting boundary conditions of the digital dental model to obtain a digital dental finite element model and carrying out nonlinear finite element calculation, and obtaining stress distribution data of the digital periodontal ligament model so as to verify the consistency of the digital tooth model with a simulated correction target when the digital tooth model is rearranged. Whether alveolar bone reconstruction is caused by bone resorption or bonedeposition of the alveolar bone under the conditions that alveolar jaw changes in pose and / or bears load can be accurately judged; the constitutive models closer to periodontal ligament characteristics are selected by utilizing the geometric models closer to the actual situation in the mouth of a patient, so that the calculated stress distribution data is closer to the actual situation, and a data basis is provided for design, preparation and inspection of subsequent dental instruments.

The invention discloses a rope type guided directional impact device for a dynamic test of an energy dissipater of a rock fall protection system. The device comprises a test block, lifting equipment,a pulling cable, counterforce piles, force sensors, test specimens of the energy dissipater of the rock fall protection system, directional ropes and a foundation pit. The test block is used for rockfall simulation; the lifting equipment is used for lifting and releasing the test block; the pulling cable is used for transferring impact force; the counterforce piles are used for mounting the testspecimens of the energy dissipater of the rock fall protection system; the force sensors are used for data acquisition; the directional ropes are used for guiding the test specimens; the foundation pit is used for providing a buffer space for an impact test and plays a role in protection; the counterforce piles are vertically arranged on two sides of the foundation pit. The device can be constructed at a nearby site, a test site is not limited by an onsite environment, carrying testing equipment to a steep cliff in each-time testing is avoided, and accordingly each-time testing cost can be effectively reduced, operating efficiency is improved, and reusability is realized.

The invention relates to the field of teaching equipment, in particular to a centripetal force verification device. 'Centripetal force' is a required course of the modern physics subject, is related in junior high school, is studied deeply in senior high school, and is also a research focus in university. In physics teaching, compared with spoon-feeding type teaching, students can understand and grasp learned knowledge more profoundly through experimental research type teaching, the students can fully participate in experiments, and each learning group can measure to obtain different experiment data and conducts calculating and verification according to the measured experiment data. The centripetal force verification device has the characteristics of easy operation, clear force analysis and accurate measurement, comparison and verification can be conducted through multiple experiments in a classroom, thus the students more quickly know about and grasp the focus and the difficulty related to the centripetal force, and a solid foundation is laid for later in-depth study.

The invention belongs to the technical field of sensors, and particularly relates to a universal pressure sensor which comprises a sphere-like shell, a detector and a distance measuring device, and the detector and the distance measuring device are mounted in the sphere-like shell. The sphere-like shell is elastic, and an isotropic medium is sealed in the sphere-like shell; the detector is used for detecting the pressure intensity of the isotropic medium when the isotropic medium is pressed; and the distance measuring device is used for detecting the deformation quantity and the deformation direction of the deformation position when the sphere-like shell is pressed. The universal pressure sensor can detect pressure values in all directions when detecting pressure, can reversely deduce the direction of the pressure, is installed at the end of a mechanical structure, can detect the stress direction and the stress magnitude of the end of the mechanical structure, and provides convenience for stress analysis of the mechanical structure. Meanwhile, according to the universal pressure sensor, the magnitude of the borne pressure can be obtained, the area of the contact surface can be estimated, and pressure sources in different directions can be distinguished in some scenes.

The invention provides a slag flushing structure. The slag flushing structure comprises a structure body and a platform component, wherein a groove with an opening in the top is formed in the structure body; the platform component is mounted at the bottom of the groove; the platform component extends in the length direction of the groove; the first side of the platform component is arranged closeto the inner wall of the first side of the groove; a ditch is formed between the second side of the platform component and the inner wall of the second side of the groove; and the top surface of the platform component is horizontally arranged. According to the slag flushing structure, the prefabricated platform component is directly mounted in the groove of the structure body, reinforced concretepouring is not needed, and construction personnel do not need to carry out building block construction in a narrow space, so that the overall manufacturing cost of a pedestrian platform and the slag flushing structure are effectively reduced, and the slag flushing structure has the advantage of being convenient to construct; and meanwhile, the platform component is separated from the structure body, so that the stress analysis of all parts of the structure body by workers is facilitated.

The invention discloses a Grassmann space and recursive surface expression-based truss stress model establishing method. The method is characterized by comprising the following steps of: 1) redefiningrational L and W curves on the basis of a Grassmann space and a Grassmann coordinate, and giving corresponding curve formulas; 2) giving curved surface formulas, on a triangular domain, of L and W curved surface on the basis of a barycentric coordinate, expanding the L and W curved surfaces from a tensor product-form rectangular domain to the triangular domain; and 3) establishing a particle truss model. According to the method, the simulation graph fitting degree and approximation precision can be improved, and grid curved surface truss stress analysis model established on the basis is simple, practical, high in correctness and good in operability, is suitable for stress analysis of rigid objects, and has ideal effect for simulation of flexible fabrics under the condition of relatively dense points.

The invention discloses an engine suspension component and a motor tricycle. The engine suspension component comprises suspensions respectively arranged on four corners of an engine and used for supporting, wherein each of the suspensions comprises an upper support plate fixedly connected with the engine, a lower support plate fixedly connected with a frame, and an elastic pad fixed between the upper support plate and the lower support plate, and each suspended elastic pad is inclined to the center in a support direction of the engine from bottom to top along a transverse direction. According to the invention, transverse restriction of the engine is realized, even if the suspensions of the engine arranged on four corners are arranged in a V-shaped groove, so that installation stability of the engine is increased, vibration and inertia from a transverse direction can be born well, shear force generated by the transverse inertia is counteracted, normal operation of the engine is ensured, and safe driving of the motor tricycle is ensured; and meanwhile, the installation stability is increased, so that fastening installation of the other part is simplified, an assembly process is simplified and the cost is reduced.

The invention relates to a light-following double-layer lead screw guide type photovoltaic mechanism folding and unfolding device which comprises a pitching angle adjusting device, a horizontal angleadjusting device and a solar panel group opening and closing device, and the pitching angle adjusting device is fixed on the horizontal angle adjusting device; and the horizontal angle adjusting device drives the solar panel set opening and closing device to rotate to achieve adjustment of the horizontal angle. Compared with the prior art, the device has the advantages of being high in structuralstrength, free of action interference, convenient to disassemble and assemble, suitable for various terrain environments and the like.

The invention discloses a force analysis tool for facilitating mechanics courses. The tool includes a circular plate, a trefoil plate, a connecting block, a square bar, a T-shaped circular table, a motor, an arc iron bar, a first laser lamp head, a fixing frame, a second laser lamp head, a U-shaped block, an indicator bar, an annular magnet, a square magnet, a threaded rod, a strip through hole, astrip sliding groove, a sliding block, a first switch, a second switch, a circular cover plate, a cylindrical groove and a button battery. The tool is advantaged in that design is novel, the tool iseasy to use the red linear light to mark the force direction and saves the time for a physics teacher for freehand drawing analysis, the structure is reasonable, the reciprocating structural functionis added, intuitive force analysis of an object is facilitated, understanding the force of the object in the moving process is facilitated, operation is convenient, and adjustment to the correspondingtilting angle and understanding the relative horizontal tilting angle are facilitated.

The invention discloses a confined concrete combination column. The confined concrete combination column comprises square steel pipe columns, U-shaped steel pipe columns, L-shaped steel pipe columns and concrete columns. One square steel pipe column serves as a benchmark column, the U-shaped steel pipe columns are sequentially welded along the adjacent edges of each benchmark column, the L-shaped steel pipe columns are sequentially welded along the adjacent edges of each U-shaped steel pipe column, and a steel pipe bundle is formed; and all the square steel pipe columns of each steel pipe bundle are filled with concrete finally, so that the confined concrete combination column is formed. According to the confined concrete combination column, the defect that the ductility and the energy-dissipating capacity of a traditional reinforced concrete column are poor is overcome; meanwhile, the steel pipe concrete section form is improved, so that the bearing capacity of the confined concrete combination column is greatly improved, and the application range of the confined concrete combination column is greatly expanded; construction is convenient; the seismic resistance of the column is greatly improved; and the confined concrete combination column is suitable for being applied to high-rise buildings and buildings in areas high in seismic intensity.

The invention discloses a network topology visualization method in an irregular region. Aiming at the problems that there is no effective solution to the topology layout in an irregular region currently, the method comprises the steps: dividing the irregular region into a plurality of parts according to the geometric features of the irregular region; building a stress model in each part accordingto the idea of force guide, and performing multiple iterations under the limit conditions, thereby enabling the intensive nodes at the center of the region to spread towards the edge and corners, andfinally enabling the nodes in the whole irregular region to be in uniform and beautiful layout.

The invention discloses sample pressing equipment for foundation reinforcement, and belongs to the field of foundation construction.The sample pressing equipment comprises a workbench, connecting columns are fixedly connected to the four corners of the top of the workbench, a top plate is fixedly mounted at the tops of the connecting columns, and a bearing box is fixedly connected to the bottom of the workbench; a compaction frame is fixedly connected to the left side of the top of the workbench, a downward pressing mechanism is fixedly installed at the position, corresponding to the compaction frame, of the top of a top plate, a feeding port is formed in the upper end of the right side of the compaction frame, a smashing box is fixedly connected to the right side of the top of the top plate, and a smashing mechanism is fixedly installed in the smashing box. And a discharging pipe is fixedly mounted at the bottom of the crushing box, the other end of the discharging pipe penetrates through the top plate to be connected with the feeding port, and a partition plate is fixedly connected to the upper end of the interior of the bearing box. And the interior of the compaction frame is used for sample pressing processing, so that a sample plate for foundation reinforcement is manufactured, and detection and analysis are facilitated.

The invention discloses a prefabricated bearing platform mounting method and relates to the field of bridge construction. The prefabricated bearing platform mounting method comprises the following steps that a bearing platform and bottom pier bodies are prefabricated in a prefabrication field, and steel pile hole positions are reserved in the bearing platform; the bearing platform is lifted to a pile site by a large floating crane; a pile top guiding device is pre-mounted on steel piles in the pile site before the bearing platform is lifted; after the bearing platform is lifted down and is in place, a carrying pole is arranged on a pile top longitudinal direction adjusting position in a hanging manner, and the horizontal plane of the bearing platform is regulated as required; and the pouring of bottom-sealing concrete of a steel cylinder cofferdam, the water pumping, the binding of reserved hole steel reinforcing bars, and the pouring of reserved hole concrete at non-lifting points and lifting points are sequentially finished, and the steel cylinder cofferdam is detached, so that the mounting of the prefabricated bearing platform is finished. According to the prefabricated bearing platform mounting method disclosed by the invention, a small steel cylinder cofferdam replaces a large bearing platform steel cofferdam, so that the steel material can be effectively saved, the on-water operation time is shortened, and the construction cost is reduced; and meanwhile, the influence of water flow to the construction of the bearing platform is reduced, and the construction quality of the bearing platform is ensured.

The invention relates to an unfolding self-angle-forming double-layer lead screw guide type photovoltaic mechanism folding and unfolding device, which comprises: an opening and closing assembly arranged on ground, which includes a door-shaped core base, door-shaped lateral bases that are arranged on the left side and the right side of the core base in parallel respectively, universal wheels that are fixed to the bottoms of the lateral bases, a double-layer lead screw driving structure which is installed on the core base, and connecting rod structures that are connected with the double-layer lead screw driving structure and the lateral bases on the two sides respectively to achieve opening and closing linkage; a folding assembly which comprises a solar panel set composed of a plurality of solar panels, an installation frame used for fixedly installing the solar panels and a folding guide structure with a set pitch angle, wherein the installation frame is connected with the opening and closing assembly through the folding guide structure. Compared with the prior art, the invention has the advantages of higher dimensional adaptability, self-forming of a certain pitch angle when beingunfolded, increase of the utilization rate of light energy and the like.

The invention discloses a vulcanization mold, which comprises a vulcanization mold body composed of a base and a cushion block; the base comprises a heating plate; a heating cavity is formed in the heating plate; a heating pipe is arranged in the heating cavity, and the top of the heating plate is fixedly connected with the bottom of the cushion block; a heat insulation block is fixedly connected to the bottom of the heating plate; a sliding mechanism is fixedly connected to the bottom of the heat insulation block; the sliding mechanism comprises a bearing block; a hydraulic cavity is formed in the bearing block; an elastic clamping ring is fixedly connected to the top of the inner wall of the hydraulic cavity; and an outer pushing block is fixedly connected to the bottom of the elastic clamping ring. The invention relates to the technical field of molds. According to the vulcanization mold provided by the invention, the problems that the mold is too heavy and inconvenient to move, the mold does not have a heating function and must be heated through heating equipment, and when an evaporator vulcanization plate is debonded in the vulcanization process, repeated adjustment can only be conducted by adding gaskets through experience are solved.

The invention discloses a rope type guided directional impact device for a dynamic test of an energy dissipater of a rock fall protection system. The device comprises a test block, lifting equipment,a pulling cable, counterforce piles, force sensors, test specimens of the energy dissipater of the rock fall protection system, directional ropes and a foundation pit. The test block is used for rockfall simulation; the lifting equipment is used for lifting and releasing the test block; the pulling cable is used for transferring impact force; the counterforce piles are used for mounting the testspecimens of the energy dissipater of the rock fall protection system; the force sensors are used for data acquisition; the directional ropes are used for guiding the test specimens; the foundation pit is used for providing a buffer space for an impact test and plays a role in protection; the counterforce piles are vertically arranged on two sides of the foundation pit. The device can be constructed at a nearby site, a test site is not limited by an onsite environment, carrying testing equipment to a steep cliff in each-time testing is avoided, and accordingly each-time testing cost can be effectively reduced, operating efficiency is improved, and reusability is realized.

The invention discloses a cylinder type guided directional impact device for a dynamic test of an energy dissipation device in a falling rock intercepting system, and a test method. The cylinder typeguided directional impact device comprises an impact block, lifting equipment, an inhaul cable, a cantilever bracket, a tension sensor, a vertical guide cylinder, a reaction wall and a foundation pit,wherein the reaction wall is vertically arranged on one side of the foundation pit, the lifting equipment pulls the impact block to hover at a certain elevation position in the guide cylinder, and releases the impact block so that the impact block falls along an empty cavity inside the guide cylinder freely and drives the inhaul cable connected thereto. The inhaul cable pulls an energy dissipation device test piece so that the energy dissipation device test piece starts to operate, and required test data is obtained by means of the tension sensor connected with the energy dissipation device test piece. The cylinder type guided directional impact device can be built on the nearby site, the test site is not limited by the on-site environment, the test equipment does not need to be moved toa steep cliff at each test, the cost of each test can be effectively reduced, the working efficiency can be improved, and the cylinder type guided directional impact device can be reused.

The invention relates to the field of teaching equipment, in particular to a centripetal force verification device. "Centripetal force" is a compulsory course for modern elementary physics subjects. It has been studied in junior high schools, and in-depth research is required in high schools. It is also a research focus in universities. In physics teaching, compared with cramming teaching, experimental discussion teaching can enable students to deeply understand and master what they have learned. In the experiment, students can fully participate in it. Each study group can measure and obtain different experimental data. And carry out calculation and verification according to the experimental data measured by oneself. A kind of centripetal force verification device disclosed by the present invention has the characteristics of simple operation, clear force analysis and accurate measurement. Multiple experiments can be done in the classroom for comparative verification, so that students Understand and master the key points and difficulties related to centripetal force faster, and lay a solid foundation for later in-depth research.

The invention discloses a centripetal force experimental device. The centripetal force experimental device comprises a base, a rotating disc, a controller, a rotating motor, a photoelectric door, a tension sensor, a pressure sensor, a sphere and a flexible rope without elasticity, wherein a central shaft is arranged at the center of the rotating disc; the rotating motor is used for driving the rotating disc to rotate; a limit slot is arranged on the rotating disc; the center shaft is sleeved with the tension sensor; a pull ring of the tension sensor faces the limit slot; a limiting ring is arranged in the limit slot; the flexible rope penetrates through the limiting ring and is connected with the pull ring and the sphere; the center of the pull ring, the center of the limiting ring and the center of the sphere are located on the same horizontal line, and the horizontal line penetrates through the center of the center shaft; the pressure sensor is annularly arranged on the inner wall of the limiting ring; a straight rod is arranged at the bottom of the rotating disc; and the photoelectric door is used for monitoring rotation of the straight rod. The invention relates to the technical field of physics experimental equipment, and aims to solve the technical problems that an existing centripetal force demonstration experiment is not visual, has large errors, and cannot obtain experiment data.

The invention discloses a compass type vertical pipe hanging bracket which comprises side plates, hanging plates and lug shafts. One ends of the lug shafts are welded to the outer side wall of a vertical pipe, and the other ends of the lug shafts are connected with the side plates. The side plates are arranged on the outer side of the vertical pipe and connected with the hanging plates. The hanging plates are connected with a hanging bracket connecting piece and / or a hanging bracket function piece. During use, loads are transmitted to the lug shafts through the vertical pipe, transmitted to the side plates through the lug shafts, transmitted to the hanging plates through the side plates and transmitted to the hanging bracket connecting piece and / or the hanging bracket function piece through the hanging plates, and therefore the loads are transmitted to a bearing structure through the hanging bracket connecting piece and / or the hanging bracket function piece. The compass type vertical pipe hanging bracket can adapt to vertical pipe angle displacement, and uneven loading of two hanging rods is avoided.

The invention relates to the field of workpiece hoisting, and provides a special hoisting tool for bundled aluminum ingots. The special hoisting tool for the bundled aluminum ingots comprises a main bearing beam, a lock nut, an assistant bearing beam, hoisting hooks, a linkage supporting plate and a locking part. The hoisting hooks are connected with the assistant bearing beam through a hinge structure, a lever is arranged on the hoisting hooks, the hoisting hooks can rotate on a supporting shaft of the assistant bearing beam through the movable lever, a long hole is formed in the movable lever, and the movable lever is connected with the linkage supporting plate through the long hole. The hoisting hooks are opened and closed to be linked with the linkage supporting plate, the locking part can conduct position locking on the linkage supporting plate so as to limit the hoisting hooks to be opened and closed, and therefore the safety is guaranteed. The special hoisting tool for the bundled aluminum ingots has the advantages that the structure is simplified, manual operation is adopted, and therefore the special hoisting tool is flexible, simple and practical; due to the fact that a safety locking mechanism is additionally arranged, accidents are effectively avoided; and the structure of the hoisting hooks is redesigned, the force distribution is optimized, the local stress is reduced, the weight is reduced, and materials are saved.

The invention discloses a mechanical testing device for sliding pipe bus support fittings. The mechanical testing device comprises a test pedestal on which an installation structure for the sliding pipe bus support fitting is arranged, wherein two sets of pressure devices are arranged on left and right sides of the installation structure; each set of pressure device comprises a support mechanism fixedly arranged on the test pedestal, a pressure spring arranged on the support mechanism, and a pipe bus pressure transmitting piece which is arranged on the support mechanism and pressures the auxiliary pipe bus, which is penetrated into the sliding pipe bus support fitting, under the effect of the pressure spring. The mechanical testing device can fully simulate the sliding pipe bus support fitting which is suffered from acting forces on two sides from the sliding pipe bus when in actual operation, is simple in structure and convenient to operate, and thereby the result of a mechanical test which verifies mechanical strength of the sliding pipe bus support fitting is more reliable.

The present invention discloses a model testing device for resisting ocean current impact in horizontal direction of a bottom-supported type breeding platform. The device is characterized in that: ina structure of the device, four optical axis slider assemblies are arranged all parallel to a linear guide rail in a uniform matrix; a test mounting plate is supported together by four sliders, and the test mounting plate is provided with threaded through holes; a main waterway is provided with a branch that is sealed and docked with each threaded through hole; inside a trough body is provided with seabed sediments, and each suction nozzle is installed on the corresponding threaded through hole and extends into the seabed sediments; a water pressure sensor is connected in series on the main waterway and is slightly higher than the trough body in a vertical direction of space; during a test, the test mounting plate and / or the trough body are in contact with a pressure sensor; and a data acquisition device is in individual electrical connection with the water pressure sensor and the pressure sensor. The device solves the technical problem of "testing of resistance performance of sea-water impact in horizontal direction of the bottom-supported type breeding platform model in a static water tank", and has the advantages of a simple structure, convenient test operation and the like.

The invention discloses a mining directional drilling trajectory tracking method and system and a storable medium, and belongs to the technical field of geological exploration. The method comprises the following steps: adopting approximate analysis to simplify stress analysis of a hole bottom drilling tool; introducing deflection, and superposing displacement deviation caused by the dead weight of the drilling tool to a prediction track of the drilling hole of the next drilling rod; and constructing a deviation function about a next drill rod tool face angle by adopting a constraint condition that the distance from the prediction track to the design track is shortest. According to the method, the process of deducing the prediction track of the drilling of the next drill rod through stress analysis of the hole bottom drilling tool is simplified, the dependence of the prediction model on stratum parameters and drilling tool parameters is reduced, the influence of the self weight of the drilling tool is considered, the whole prediction model is simple and accurate, meanwhile, the solution of the optimal tool face angle is convenient to calculate, and no any sensor is needed in the whole process of tracking the trajectory, so that the cost is reduced, and the safety performance is enhanced.

The invention discloses a power transmission tower pole stress calculation method based on finite element analysis. The power transmission tower pole stress calculation method comprises the following steps: establishing a finite element mechanical model of a tower structure by utilizing a finite element method, and carrying out discretization of an integral structure according to the composition of the tower structure; generating an element rigidity matrix for each element, and overlapping the element rigidity matrixes to generate an integral rigidity matrix in combination with a space angle relationship and a connection relationship among various poles in the tower structure; then, generating a load array according to a load borne by the tower, and constituting a matrix equation by a node displacement array as an unknown quantity, the integral rigidity matrix and the load array; finally, acquiring a node strain by solving the matrix equation, and finally acquiring the stress of each pole in the tower structure. According to the power transmission tower pole stress calculation method, the power transmission tower pole stress is accurately solved directly by a mathematical method, and a scientific basis is provided for safety evaluation of the tower structure.

The invention discloses a multilayered stereo park with a detachable movable aluminium alloy frame. The multilayered stereo park includes a frame structure produced by aluminium alloy squeezing profiles; the frame structure is internally divided into at least three layers in the vertical direction and the width of each layer can accommodate at least three vehicle carrying units; the number of thevehicle carrying units arranged in other layers except the top layer is at least one less than the maximum accommodating number of the corresponding layer; the vehicle carrying units can freely translate in the horizontal direction and vehicle bearing plates are hung below the vehicle carrying units; and the vehicle bearing plates can rise or decline relative to the vehicle carrying units. The defects of corrosion and poor durability and weather fastness of steel of a traditional steel structure park, troublesome maintaining during use and high cost of the traditional steel structure park in the prior art are overcome; the technical problems that the top layer and the bottom layer of the existing steel structure stereo park are non-protective, disassembly is not convenient and recycle of materials is not achieved are solved; and vehicles can directly achieve the parking or taking of the vehicles by combining of horizontal moving and vertical moving.