38results about How to "Constant stiffness" patented technology

A stent includes a wave form that includes a plurality of struts and a plurality of crowns. Each crown connects two adjacent struts within the wave form. The wave form is wrapped around a longitudinal axis at a pitch angle to define a plurality of turns and has a central portion and two end portions located on opposite sides of the central portion. At least some of the struts located in the end portions have lengths longer than an average length of all of the struts of the wave form. The stent also includes a plurality of connections. Each connection connects selected crowns from adjacent turns. The connections are positioned along the stent substantially equally so that a density of the number of connections of the end portions is substantially equal to a density of the number of connections of the central portion.

The invention discloses a satellite-rocket separation transition buffering device, and belongs to the field of a satellite system-level buffering technique. According to the buffering device disclosed by the invention, a connecting interface of a traditional satellite and a carrier rocket is divided into a lower connecting disk, an upper connecting disk and a crossed support frame, wherein the lower connecting disk is connected with the carrier rocket, and an initiating explosive device mounting hole and a top pressure hole for a mandril of a separation spring are formed in the lower connecting disk; the upper connecting disk is connected with satellite contacts, and an initiating explosive device avoiding hole and six bolt connecting holes are formed in the upper connecting disk; a rigidity transition structure, i.e. the crossed support frame is additionally arranged between the lower connecting disk and the upper connecting disk, and one connecting disk is additionally arranged, so that the decrement of an impact load during satellite-rocket separation is increased; and at the same time, the rigidity transition structure is additionally arranged between the upper connecting disk and the lower connecting disk, so that the transferring distance of shock waves is increased, and an impact on the satellite is reduced. The buffering device disclosed by the invention can realize the satellite system-level buffering, and at the same time, can ensure that the rigidity of the whole satellite is basically unchanged, so that the design requirements of a satellite fundamental frequency are met.

The invention relates to a connecting node of a concrete filled steel tubular column and a reinforced concrete beam and a construction method of the connecting node. The connecting node is arranged at the junction of the concrete filled steel tubular column and the reinforced concrete beam; a plurality of first holes are formed in the steel tube of the concrete filled steel tubular column; reinforcing plates are arranged on the outer peripheral surface of the steel tube and correspond to the holes; second holes overlapped with the holes are formed in the reinforcing plate; a plurality of reinforced steel bars corresponding to the first holes are respectively arranged in the reinforced concrete beam; the reinforced steel bars of the reinforced concrete beam respectively penetrate through the first holes and the second holes in corresponding positions. By adopting the connecting node of the structure, as the holes in the steel tube are relatively small, the cross section of the steel tube is not greatly weakened, and seams left after the reinforced steel bars penetrate through the small holes are also relatively small, the constraining force of the steel tube to the concrete filled steel tubular column is barely reduced, the bearing capacity and the deformation property of the concrete filled steel tubular column are not affected, and the bearing capacity of the concrete filled steel tubular column is barely affected.

The invention discloses adouble-liquid stirring grouting systemwhich comprises rotatable slurry channel switching components, wherein the rotatable slurry channel switching components rotate so as to grout slurry through grouting channels; through switching of the rotatable slurry channel switching components, twotypes of slurry can be separately and simultaneously grouted into a drilling rod which rotates continuously; the slurry is conveyed to the drill bit through a grouting channel inside the drilling rod; the two grouting channels are in a tube bundle mode, so thatthe cross section rigidity is veryhighto avoiddistortion, the pressure is stabilized within a certain fluctuation range to continuously grout the two types of slurry into a soil layer, the slurry is ejected out from ejection holes in the drill bit, and under the continuous stirring of the stirring blades of the drill bit, the two types of slurry are sufficiently and uniformly mixed. The strength of a column body is improved as the two types of slurry are cured and formed through rapid chemical reaction, so that the double-liquid stirring grouting system is applicable to grouting systems of pile machines such as ordinary stirring pile machines, bidirectional stirring pile machines, double-tube multi-directional stirring pile machines, and has wide applicability.

The invention discloses an elevator car floor vibration-damping device and an elevator, the elevator car floor vibration-damping device comprises a plurality of vibration-damping components, and each vibration-damping component includes a lower bearing plate, an upper bearing plate, a plurality of springs connected between the upper bearing and the lower bearing plate, support posts that run through the upper bearing plate and the lower bearing plate and that each have an upper end fixedly connected with the upper bearing plate and a lower end positioned below the lower bearing plate, and rubber blocks sleeving the lower ends of the support posts and pressing between the lower surface of the lower bearing plate and the lower ends of the support posts. By using the elevator car floor vibration-damping device on the elevator, it is possible to provide high static compression capacity, low inherent frequency and good low-frequency vibration-isolating performance for the elevator, and a rider can feel vibration damping being similar to energy-absorbing vibration damping; the elevator car floor vibration-damping device is suitable for vibration isolation for an elevator; in the case that the elevator experiences weightlessness (i.e., the elevator runs downward), for vibration damping when a car rebounds up occasionally due to various impact loads, the rubber blocks are arranged on the lower surface of the lower bearing plate, rubber is under pressure during rebounding, and reliable vibration damping is provided.

Provided is a spoiler, in particular adaptable spoiler, for a wind turbine blade including: a main body including an airfoil shaped surface to be exposed to air flow; at least one stiffening element distinct from the main body and supporting the airfoil surface, wherein the stiffening element is in particular configured to enforce the shape of the airfoil surface during loading by wind during operation of the wind turbine.

The invention belongs to the technical field of non-woven fabric production and manufacturing, and particularly relates to a method for producing a non-woven fabric through gas-stimulation reinforcedfiber web. Gas-stimulation reinforcement is conducted on the fiber web through airflow, a non-woven fabric is produced; the fiber web is obtained through at least one of four web formation modes of carding web formation, airflow web formation, spinning web formation and melt-blowing web formation; fiber of the fiber web is natural fiber or conventional chemical fiber or differential fiber or functional fiber or high-performance fiber. Compared with a spunlaced non-woven fabric, the whole process of the method does not need water, energy conservation and environmental friendliness are better achieved, the method is updating and upgrading of the spunlaced process, production can be conducted by transforming equipment on an exiting non-woven production line, and the method is suitable for scale production; compared with a spunlaced non-woven fabric, defects of oil stains formed by gas-stimulation reinforcement, and the method has the advantages of being hygienic and environmentally friendly.

The invention discloses electrode shape regulatable CMUTs (capacitive micromachined ultrasonic transducers) with high ultrasonic transceiving performance. Upper electrodes of conventional CMUTs are round or polygonal, and at least cover the central area of a suspended thin film; different from upper electrode structures of the conventional CMUTs, the CMUTs are characterized in that through holes are formed in central areas of hollow electrodes of the CMUTs, and the central area of the suspended thin film is not covered with the electrodes. According to the hollow electrode design, the rigidityof the center of the suspended thin film and the thin film area fixedly supported between support column areas can be reduced by the electrostatic softening effect, the rigidity of the central area of the thin film keeps unchanged, so that the suspended thin film produces piston-like vibration, average displacement of the whole suspended thin film is increased, and emission intensity and receiving sensitivity of ultrasonic waves are improved. According to the CMUTs with the hollow electrodes, the problem of mutual restriction of ultrasonic emission and receiving performance of the conventional CMUTs is solved, simultaneous improvement of ultrasonic emission and receiving performance can be realized effectively, besides, the structure and the process are simple, and the CMUTs can be applied to the air coupling application fields of ultrasonic biometric identification, 3D ultrasonic posture recognition and the like.

The invention discloses a variable-stiffness flexible grinding and polishing actuator, and belongs to the technical field of solid wood panel machining. The variable-stiffness flexible grinding and polishing actuator comprises a box body, an active flexible mechanism, a passive flexible mechanism and a grinding and polishing head mechanism arranged outside the box body; the active flexible mechanism and the passive flexible mechanism are arranged in the box body from top to bottom; a pressure sensor is arranged between the active flexible mechanism and the passive flexible mechanism, and the grinding and polishing head mechanism is connected with the passive flexible mechanism. The problem that active and passive flexible separation of a common grinding and polishing machine has many defects can be solved.

The invention relates to a method for elastically restraining main beam displacement of an ultrahigh-span cable-stayed bridge. The method comprises the following steps: after construction of main towers, arranging permanent supports on the top surfaces of main tower transverse beams; arranging zero segments of main beams; arranging temporary concretion between the main tower transverse beams and the main beams; assembling cantilevers with the main beams into largest cantilevers; before folding of the main beams, arranging spring devices on the top surfaces of the main tower transverse beams; connecting upper connecting plates of the spring devices with the bottom surfaces of the main beams, and connecting lower connecting plates with the top surfaces of main tower transverse beams; after folding of the main beams, removing the temporary concretion; performing subsequent construction. The spring devices are arranged among the main tower transverse beams of the ultrahigh-span cable-stayed bridge along the longitudinal direction of the bridge, elastic restraint is provided for the main beams by using the spring recovery force, and the main beams are controlled to perform longitudinal displacement under the action of static power load. The displacement of the main beams can be effectively controlled, the inner stress of the main tower is reduced, the extension and contraction amounts of a beam end extension and retraction device and a rail extension and retraction adjusting device are reduced, and the driving stability and safety of the bridge surface are improved. The method is applied to the Hu-Tong highway-railway dual-purpose cable-stayed bridge being 1,092 meters in length.

A horizontally arranged six-degree-of-freedom constant-stiffness mechanism is provided, and includes an upper platform, a bottom plate, three composite spherical hinges, spherical hinges, support rods, guide rail slider assemblies, and six electromagnetic adjustable stiffness units. Two ends of a shaft on which a permanent magnet is fixed in each electromagnetic adjustable stiffness unit are fixed to the bottom plate via shaft supports. Axially moving housings of electromagnetic adjustable stiffness units are fixed on sliders of the guide rail slider assemblies via slider backing plates respectively. Guide rail slider assembles are fixed on the bottom plate. Tops of the housings are mounted with the spherical hinges respectively. A bottom of the upper platform is uniformly mounted with the composite spherical hinges. One end of each support rod is threadedly connected to a corresponding one of the spherical hinges, and another end is connected with a corresponding one of composite spherical hinges.

The invention relates to an aero-engine vector force test stand capable of realizing self-decoupling. The stand comprises a fixed rack, a moving rack and force measurement assemblies, wherein the fixed rack is used for supporting the moving rack and the force measurement assemblies, the moving rack is used for mounting a test engine, a push force vector generated by the engine is transmitted through the moving rack to each force measurement assembly, the force measurement assembly comprises a flexible element and a force measurement sensor and is used for connecting the moving rack and the fixed rack and measuring the push force vector generated by the engine, a borne axial force is converted by the force measurement assembly into a voltage signal, according to a mapping relationship between the push force vector and the measured voltage signal, the push force vector of the engine can be measured. According to the aero-engine vector force test stand, a combined one-dimensional self-decoupling force measurement model is applied to a three-dimensional vector force measurement stand, constant rigidity of the stand can be kept and is not influenced by external loads, a push force evaluation and correction process is simplified, push force measurement precision is improved, and the aero-engine vector force test stand is mainly applied to aero-engine tests, rocket engine tests and other vector force measurement measure occasions.

The present invention relates to a steering module for a toy vehicle, particularly for a remote control toy vehicle. The steering module is provided with at least two steerable wheels, a steering motor and a steering gearbox. Each steerable wheel is suspended through a corresponding mandrel, wherein at least one mandrel is provided with a teeth-shaped device. The steering gearbox is engaged with the teeth-shaped device for transmitting steering motion.