64results about How to "Not easy to lose stability" patented technology

The invention discloses three-dimensional compression members of a tension structure. The three-dimensional compression members of the tension structure comprise first regular tetrahedron-based members, second regular tetrahedron-based members, regular hexahedron-based members and cube-based members, wherein the vertexes of the members are provided with positioning holes which are connected through ropes, the ropes comprise the ropes perpendicular to the extending directions of the members and the ropes parallel to the extending direction of the members, and the included angles formed between the ropes perpendicular to the extending directions of the members and the ropes parallel to the extending direction of the members are greater than 90 degrees. The three-dimensional compression members expand the range of the tension structure, and one-dimensional compression members of the tension structure are expanded into the three-dimensional compression members. Control over a spatial structure is simpler, and the three-dimensional compression members of the tension structure overcome the defects as for a bar and rope structure, that the number of compression bars is large, prestressing force of structural arrangement needs to be considered, and the compression bars can lose stability possibly. The ropes among the members are relatively independent, the connection ropes between every two adjacent members provide the prestressing force for connection of every two adjacent members, and the spatial structure is easy to control and not prone to losing stability.

The invention discloses a method of load shedding of a floating wind turbine generator system based on semi-active structure control of a magneto rheological damper. The method includes the following steps: (1) analyzing the structure of the magneto rheological damper, obtaining a force-displacement relationship of the magneto rheological damper; (2) establishing an equation of motion of a multi-degree of freedom system of an offshore floating wind turbine generator system which is configured with the magneto rheological damper, and establishing equations of motion of the wind turbine generator system and the magneto rheological damper; (3) controlling the magneto rheological damper through a LQR controller and a Fuzzy controller so as to reduce the pitch angle of the floating wind turbine generator system and the longitudinal displacement of a nacelle. According to the invention, the method overcomes the defects of passive control and active control in structural control of a damper, requires less extra energy, requires simple apparatus and is not less susceptible to stability loss, can effectively reduce total load of the floating wind turbine generator system, guarantees stability of a platform, and further increases service life and energy quality of output electricity of a wind turbine generator.

The invention relates to a yielding type special-shaped beam anchor rope truss roadway support system. A metal net is laid on the surface of the roadway. A yielding type special-shaped beam anchor rope truss is arranged on the coal rock roof or roadside. The yielding type special-shaped beam anchor rope truss comprises special-shaped beams, a yielding device and anchor ropes or anchor rods, wherein each special-shaped beam is provided with a plurality of anchor ropes or anchor rods; the anchor ropes or anchor rods penetrate through the special-shaped beams and the metal net and are anchored into rock layers; and outer anchoring ends of the anchor ropes and anchor rods are provided with the yielding device and a tray for letting the end tips of the anchor ropes and anchor rods to be in contact with the special-shaped beams and exerting yielding action. The yielding type special-shaped beam anchor rope truss roadway support system has the advantages of large surface protecting area and high rigidity and is not easy to become unstable; steel is saved, cost is reduced, and efficiency is improved; strength is high, the performance adjustment space of an entire support is great; and the yielding device plays the action of effective yielding, and coupling yielding support ensures the stability and safety of the entire support system.

The invention provides a cross inserting plate for a power transmission line steel tube tower, belongs to the field of inserting plate connecting structures in power transmission line steel tube towers, and solves the problem that the cross butt joint gap of a connector is weaker in rigidity, so that overall stress coordination of the connector is improved. The cross inserting plate comprises gusset plates and inserting plates, the gusset plates are crossly arranged to form a gusset plate joint, the inserting plates are crossly arranged to form an inserting plate joint, the gusset plate joint and the inserting plate joint are connected together through connectors and fasteners, and the connectors are crimped plates which are symmetrically distributed about the center of the cross inserting plate. By the aid of the crimped plates, as out-of-plane rigidity is enhanced, lateral bending resistance of crimped combination is enhanced, eccentric compression bearing capacity is improved by 44.51% as compared with that of a strip plate connecting mode, structural stress coordination of the steel tube tower is better, structural stability is enhanced, the connecting mode can be used for connecting joints of main materials, diagonal materials, cross diagonal materials and the like in the steel tube tower, and the cross inserting plate is simple to machine, easy to mount and low in service cost.

The invention relates to a corrugated sandwich road protection structure. The corrugated sandwich road protection structure comprises spiral columns, a sandwich corrugated plate, main corrugated taper pipe assemblies, and subsidiary corrugated taper pipe assemblies; the sandwich corrugated plate comprises a corrugated shell, and fillers arranged in the corrugated shell; the upper portion of each spiral column rotates along the axis and forms warped surfaces; and each main corrugated taper pipe assembly and each subsidiary corrugated taper pipe assembly are connected with the sandwich corrugated plate and the upper portion of corresponding spiral column, the main corrugated taper pipe assemblies are obliquely connected with the sandwich corrugated plate, and the subsidiary corrugated taper pipe assemblies are vertically connected with the sandwich corrugated plate. The corrugated sandwich road protection structure solves the problems that protective fences of a general road and an expressway are not strong enough in crashworthiness, single in energy-absorbing form, and poor in buffering effects, and cannot effectively prevent vehicles off the road. The corrugated sandwich road protection structure has the beneficial effects of having a characteristic of high energy absorption; being safe and reliable with high stability, strong in crashworthiness, and high in adaptability of impact angle; and being easy to mount, convenient to replace, and high in sustainable use.

The invention relates to an onboard pod body for a helicopter. The onboard pod body is characterized in that a top plate and a cold plate are fixed on and under a left-end frame, a right-end frame, a left-medium frame and a right-medium frame which are arranged in parallel to form a pod body, a plug in connector and a plug in box are arranged between the left-medium frame and the right-medium frame, two lifting lugs are arranged on the outer side of the top plate, lateral plates are arranged on two sides of the top plate 8 and the cold plate 9, a cold plate cover plate and an air inlet are arranged on the cold plate, the left-medium frame and the right-medium frame are provided with air ducts and externally provided with air outlets, through holes in which a cable penetrates are arranged in the left-medium frame and the right-medium frame, a closed space is arranged between the left-medium frame and the right-medium frame, and the air inlets penetrate through a cold plate air duct, and then penetrate through the medium frame air ducts to form a heat radiating channel together with an air outlet. According to the invention, by adopting technical schemes that an integral wallboard structure is adopted in the top plate and the cold plate, a pod body framework, an environment control system and onboard electronic device cabinet are integrally designed, and the environment control system is isolated from the electronic device, the technical problems of low requirements of rigidity, strength, better heat radiation and protection, and the like are solved.

The invention discloses a connecting joint for a buckling-restrained brace and a concrete frame beam; an anchoring part is formed by integrally welding one group of spaced H-shaped profile steels and upper and lower anchoring plates; a joint plate is integrally welded with the lower anchoring plate; two ends of the lower anchoring plate are lengthened to be longer than the lateral side of the joint plate; and bolt holes for fixed connection of a buckling-restrained brace are formed at two sides of the joint plate. The joint has the advantages: the H-shaped profile steels have good stability in a vertical plane and are high in rigidness and not easy in unstability; the profile steels have big welded areas with the anchoring plates and are not easy to produce pulling/pushing damage; the profile steels have big contact and load-transfer areas with the concrete and are capable of uniformly dispersing the load to the concrete beam; the lengthened parts at two ends of the lower anchoring plate are capable of effectively avoiding direct extrusion between the joint plate and the concrete, so that the stress concentration is relieved and the service life of the joint is prolonged; a clearance is formed between two profile steels, the integrality of the concrete beam is not influenced, the arrangement of hoops and longitudinal ribs in the concrete beam is not influenced and the construction is convenient; the steel ratio in the joint area of the concrete beam is increased and the strength and rigidness of the joint is improved by the plastic deformation of the beam restrained by the upper and lower anchoring plates; the whole component can be manufactured in a factory and the construction time is saved.

The invention relates to a permanent magnet synchronous motor deep flux weakening method, and aims to solve the problem of unstable depth flux weakening. The method comprises the following steps of S1, performing voltage closed-loop calculation on a set bus voltage to obtain a d-axis current compensation amount; S2, performing current table lookup according to the rotating speed, the bus voltage and the torque to obtain a table lookup current point; S3, performing compensation current path calculation on the d-axis current compensation amount and the lookup table current point to obtain a current compensation point; S4, performing additive operation on the current compensation point to obtain a reference current point; S5, respectively performing current regulation operation and feedforward voltage calculation on the reference current point to obtain a reference voltage point and a feedforward voltage compensation point; and S6, integrating the reference voltage point and the feedforward voltage compensation point, and then loading to a motor. The method has the beneficial effects that the deep flux weakening is stable, the high-speed flux weakening region is good in dynamic response, the motor operation speed range is wide, and aiming at the required voltage utilization rate, the dynamic and static characteristics of high-speed flux weakening are ensured by adopting a vector flux weakening compensation mode.

The invention belongs to the technical field of honeycomb structures, and relates to a guide expanded tube type honeycomb and a manufacturing method thereof. The guiding expanded tube type honeycomb is characterized in that honeycomb tube parts are partially arranged into expanded tubes to form energy absorbing units in an interference fitting manner, wherein a plurality of energy absorbing unitsare arranged around a guiding tube; in case of impacting force, the guiding expanded tube type honeycomb is axially guided through the guiding tube, and the expanded tubes are uniformly crushed through the honeycomb tubes, thus the inside diameter of the expanded tubes increases due to expansion, and the impacting kinetic energy can be converted into expanded tube deformation and frictional heat energy, and as a result, the first-order energy absorbing is realized; when the honeycomb tubes are completely crushed and positioned into the expanded tubes, the honeycomb tubes and the expanded tubesare uniformly wrinkled and crumpled under the guiding of the guiding tube, and the impacting kinetic energy is converted into plastic deformation of the honeycomb, thus realizing the second-order energy absorbing. Therefore, energy absorbing elements of the guide expanded tube type honeycomb have the second-order energy absorbing capacity; the guiding tubes for guiding are capable of guiding thehoneycomb tubes to axially compress toward the expanded tubes in the whole honeycomb impacting and energy absorbing process, and moreover, instability is hardly caused; and meanwhile, the lateral stressing intensity of the honeycomb is improved through the guiding tube, so that the axial compressing can be uniformly and stably performed.

The invention discloses a double-layer fold-line-shaped large-span tension structure. The tension structure comprises fold-line-shaped compression members and tension ropes, wherein a plurality of straight bars are connected end to end to form each fold-line-shaped compression member, the tension ropes include horizontal fixing ropes and vertical prestressing force ropes, the fold-line-shaped compression members which are connected end to end are in the same spatial plane and arranged at equal intervals in a staggered mode, and each hole of each fold-line-shaped compression member is fixedly connected with an adjacent hole in the horizontal direction through one of the fixing ropes and fixedly connected with an adjacent hole in the vertical direction through one of the prestressing force ropes. The double-layer fold-line-shaped large-span tension structure is simple in structure, reasonable in stress and light in weight, the prestressing force can be conveniently and completely controlled through the ropes in the vertical direction, the span extension of the structure can be achieved by increasing the number of the straight bars on the fold lines, the double-layer fold-line-shaped large-span tension structure is convenient to assemble and detach and belongs to a green building which can be rapidly installed and detached, and the fold-line-shaped compression members can be folded or detached to transport and store.

The invention provides a high-elasticity and high-toughness gel micro-nano particle and a preparation method thereof. The high-elasticity and high-toughness gel micro-nano-particle is prepared from, by weight, 5 to 20 parts of a monomer, 0.05 to 0.2 part of nano-cellulose, 0.015 to 0.6 part of a cross-linking agent, 0.04 to 0.2 part of an initiator and 79 to 95 parts of deionized water. The invention further provides the preparation method of the high-elasticity and high-toughness gel micro-nano particle. The nano-cellulose is introduced into a gel network structure as a rigid unit of the gel,so the toughness of the gel is improved, and the contradiction between the elasticity and the viscosity of the gel is regulated; and the preparation process is simple and easy to operate, the cost islow, and the problems of low mechanical strength, poor stability, poor crack regulation and control capability and the like of a gel system are effectively solved.

The invention relates to the technical field of special members for construction or construction of other buildings, in particular to a welding horizontal sleeve type lattice column. In order to solve the technical problems, the adopted technical scheme is that in a horizontal plane, welding horizontal sleeves (3) are formed by welding a plurality of horizontal poles (1) in a one-layer or multiple-layer manner, are connected to the connecting horizontal poles (1) and vertical uprights (4a), or are further connected to vertical braces (4b), so as to form the welding horizontal sleeve type lattice column. Compared with the prior art, the welding horizontal sleeve type lattice column provided by the invention has the advantages as follows: compared with a round bar steel tube single vertical upright, the lattice column has low probability of instability, solves the difficult problems of safety of a scaffold and a template bracket, and can be matched with a current fastener type scaffold and a bearing and inserting type disc buckling type scaffold; and the welding horizontal sleeve is an instrument type member, so that the quality can be controlled easily. The lattice column can also be used as a construction platform and a structural column.

A forming die for the window eaves at the corner part of a railway carriage includes a lower mold fixedly connected with a lower mold seat and an upper mold fixedly connected with a templet. The mold surface shapes of the lower mold and the upper mold are corresponding to the shape of a workpiece of the window eaves at the corner part of the railway carriage. The lower mold consists of a fixed lower mold, an elastic lower mold and a spring arranged along the vertical direction. The spring is arranged in a neck at the back surface of the elastic lower mold on the lower mold seat. A side supporting plate fixedly connected with the lower mold seat is arranged on the external side on the vertical direction of the elastic lower mold. The interface of the fixed lower mold and the elastic lower mold is coplanar with a pitch arc formed by the lowest points of the lower concavely folded side at the lower side on the vertical direction of workpiece of the window eaves at the corner part of the railway carriage. The die uses two lower molds of the fixed lower mold and the elastic lower mold with completely different performances at an extremely centralized location of the internal stress for the workpiece of the window eaves at the corner part of the railway carriage and the material is not easy to lose stability, crinkle and the invention can lead workpiece of the window eaves at the corner part of the railway carriage to be able to use one set of die to form by one time during the processing process; thus improving the product quality and reducing the product manufacture cost.

The invention relates to the technical field of mining machinery, and discloses a mining machinery damping supporting device which comprises a mounting main frame, the mounting main frame is in a rectangular frame shape, first rectangular grooves are formed in the four corners of the upper surface of the mounting main frame correspondingly, and first damping rubber pads are arranged on the groove bottom surfaces of the first rectangular grooves; a mounting bottom plate is arranged on the upper surface of the first cushioning rubber mat. According to the damping supporting device for the mining machine, by arranging the mounting main frame and the mounting base, the mining machine can be mounted on the upper surface of the mounting base, and when vibration generated during operation of the mining machine is transmitted to the mounting base, a second damping rubber mat avoids hard contact between the mounting top plate and the mounting base; the vibration conducted on the mounting base is partially filtered, the vibration sense on the mounting base is greatly reduced, the center damper and the diagonal dampers both endow the device with good damping and buffering effects, so that when the device is vibrated, the center damper and the diagonal dampers are deformed, and the spiral springs have elasticity.

The invention discloses an oil pipe supporting device for intelligent separate-layer oil extraction and a using method thereof, and relates to the technical field of oil and gas equipment. The oil pipe supporting device comprises a cushioning mechanism, the cushioning mechanism comprises a mechanism wall, the bottom of the mechanism wall is fixedly connected with a ball, the ball is made of non-Newtonian fluid. An elastic wall is fixedly connected to the inner side face of the mechanism wall, a rib plate is fixedly connected to the surface of the mechanism wall, a baffle is arranged at the top of the inner side face of the mechanism wall, a connector is fixedly connected to the inner side face of the mechanism wall, and the top end of the connector penetrates through the baffle. According to the oil pipe supporting device for intelligent separate-layer oil extraction and the using method thereof, through cooperative use of the cushioning mechanism, an anti-deposition mechanism, a flexible mechanism, a thermal compensation mechanism and other mechanisms, the problems that the supporting device vibrates unstably due to mechanical operation in an oil extraction area, an oil pipe is prone to being damaged at the connecting position of the oil pipe and the supporting device, and the heat expansion and cold contraction amount of the oil pipe cannot be effectively compensated are solved.