39 results about "Unidirectional coupling" patented technology

A unidirectional coupling damping pulley includes a threaded central spindle extending into a pulley hub, a friction stopper ring and a positioning sleeve pressed against the inner wall of the pulley hub, a protruding ring formed on the outer diameter of the central spindle, in which the central spindle is sleeved with a damping washer forming a step on one side of the damping washer, the central spindle is sleeved with a damping spring the damping washer is sleeved and in rotation fit with a friction sliding ring, a friction spring is sleeved around the damping spring the friction spring locks up with the friction stopper ring and the friction sliding ring through friction, and the friction spring can be separated from the friction stopper ring and the friction sliding ring alternately.

The invention relates to a structural dynamics analysis method and system for an inflatable reentry vehicle considering nonlinear influences, and belongs to the field of areospacecraft reentry and return. According to the structural dynamics analysis method and system for the inflatable reentry vehicle considering nonlinear influences, characteristics of statics, modality and thermal modality of the inflatable reentry vehicle under influences of different inflation pressures, film thicknesses, hypersonic flow field pressures, temperatures and other nonlinear factors can be accurately described. Calculation methods of fluid-solid unidirectional coupling and thermo-solid unidirectional coupling are successfully introduced into a nonlinear structural dynamic simulation module, combined with an actual trajectory of the inflatable reentry vehicle, and an influence rule of changes of internal inflatable gas parameters on characteristics of statics, modality and thermal modality of the inflatable reentry vehicle is truly expressed. The structural dynamics analysis method and system for the inflatable reentry vehicle considering nonlinear influences have the advantages that the problem ofthe existing study on structural dynamics of inflatable reentry vehicle that the consideration of flow field non-linear and material none-linear is insufficient will be hopefully solved, and valuablereferences can be provided to shape-preserving design and structural safety design of the inflatable reentry vehicle.

The invention discloses a spatiotemporal chaos secret communication method. The spatiotemporal chaos secret communication method comprises the steps that (1), the states of a space lattice of a one-way coupling image lattice system at a sending end are divided into odd-dimensional states and even-dimensional states, (2) displacement mapping iteration is carried out on a plaintext frame and vectors in the odd-dimensional states N times, (3) a transmission signal is obtained, (4) a driving signal of the one-way coupling image lattice system at the sending end is calculated, (5) a synchronizing signal of the one-way coupling image lattice system at a receiving end is obtained, (6) the displacement mapping iteration is decoded to obtain a decryption frame corresponding to the plaintext frame, and then spatiotemporal chaos secret communication is achieved. According to the spatiotemporal chaos secret communication method, signals are coded and decoded by means of spatiotemporal chaos, the spatial state values of the one-way coupling image lattice system are grouped, iteration and aliasing of a plaintext secret key are carried out, better confidentiality is achieved, the method can be achieved easily by means of a microprocessor, integration can be achieved easily.

The invention relates to a method for predicting vibration performance of a movable guide vane of a water turbine and belongs to the technical field of hydraulic machines and system coupling simulation thereof. The method comprises the following steps: acquiring a steady flow field as the initial value condition of the flow field under the initial design configuration of the guide vane by utilizing design condition flow as the inlet boundary condition of fluid calculation; alternately calling a structural calculation module and a fluid calculation module in one time step, and integrally and synchronously advancing the fluid calculation and structural calculation after the condition of convergence is met; transmitting fluid-solid boundary information through an interface information switching module; outputting structural vibration displacement in time history. According to the method provided by the invention, coupling calculation of the guide vane and the flow field is realized; the method is obviously improved in accuracy in comparison with traditional simple structural dynamics methods and unidirectional coupling methods, and moreover, the whole vibration development process of the guide vane can be observed, and therefore, the structural design can be helped better guided, so that fluid-solid coupling goes into practical engineering application from theoretical study.

A force-transmitting device for a gravimetric measuring instrument has a load-receiving part and a stationary part. The load-receiving part is force-transmitting linked either directly or by way of at least one coupling element and at least one lever to a measurement transducer which is arranged on the stationary part. The force-transmitting device further includes a calibration lever whose fulcrum is based on the stationary part. The calibration lever includes a first and a second calibration lever arm, wherein the first calibration lever arm is solidly connected to a calibration weight, while the second calibration lever arm is connected by way of a unidirectional coupling element to the load-receiving part, or to the at least one coupling element, or to a lever arm of the at least one lever. The unidirectional coupling element is divided in two, i.e. into a first coupling element part and a second coupling element part, thus the force transmitted by the unidirectional coupling element is only tensile or compressive force because of the divided design.

A ratchet mechanism for a cargo tie-down including a unidirectional coupling. The unidirectional coupling is adapted to receive a bi-directional torque at an input thereof, and provide a unidirectional torque to a belt shaft at an output thereof.

The invention relates to a finger device of a unilateral-coupling and self-adaption composite type underactuated robot, belonging to the technical field of humanoid robot hands. The finger device comprises a base, a motor, a speed reducer, a near joint shaft, a middle finger section, a far joint shaft, a tail-end finger section, a unilateral-coupling transmission mechanism, an underactuated transmission mechanism and a spring piece. In the device, a single tendon rope coupling transmission mechanism, a self-adaption transmission mechanism and the spring piece are adopted to comprehensively realize a composite underactuated capture mode formed by combining coupling capture and self-adaption capture; as the single tendon rope coupling transmission mechanism does not interfere the self-adaption capture process, the decoupling mode is very natural, so that the internal power consumption in the capture process is reduced to the maximum extent and the transmission efficiency is reduced; the capture process of the device is humanized and the finger device has self-adaption capability to the size of the captured object; the finger device has a simple structure, low cost and little energy consumption, is easy to control, has similar appearance and action as the hands of a human body and is suitable for the humanoid robot hands.

The invention discloses an unmanned aerial vehiclefacilitating shooting. The unmanned aerial vehicle facilitating shooting includes a vehicle body. A transmission cavity is formed in the vehicle body.A through hole is formed in the inner wall of the lower end of the transmission cavity in a communicating mode. The inner wall of the bottom end of the transmission cavity is slidably connected withfoot rods which are located at the left end and the right end of the through hole and are symmetrical. A resistance spring is connected between the upper end of each foot rod and the inner wall of thetop end of the transmission cavity. A foot sole which is in contact with the ground is arranged in the lower end of each foot rod. The through hole is internally and fixedly connected with four central symmetrical rail arms. A camera lifting device is slidably connected into the rail arms. A transmission shaft extending in the left-right direction is rotatably connected into thetransmission cavity. According to the unmanned aerial vehicle facilitating shooting, in the process of ascending, the camera part is located at the lower end of a branch foot to conveniently shoot and observe and an angle of shooting is enlarged by downward movement of the self-gravity of the unmanned aerial vehicle, while in the process of descending, the camera part can be raised to protect the unmanned aerial vehicle, and automatic working mode differentiation is achieved by using a unidirectional coupling structure in the processes of ascending and descending.

The invention relates to an adaptive neural network optimal timing synchronization control method for a unidirectional coupling fractional order self-sustaining electromechanical seismograph system, and belongs to the field of seismograph system synchronization control. The method comprises the following steps: establishing a synchronization model of a one-way coupling fractional order seismograph system; and designing a controller: firstly, adopting a specified performance function and a constraint condition to ensure transient and synchronous performance of the system, adopting an interval type-2 fuzzy neural network with transformation to estimate an unpredictable function of the one-way coupling fractional order self-sustaining electromechanical seismograph system, establishing a fractional order hyperbolic tangent tracking differentiator to process the complexity of a performance function and a fractional order, minimizing a cost function to make a tracking error fall into a specified constraint region, then designing the adaptive neural network optimal timing synchronization controller in an inversion recursion form, and finally, ensuring that all signals of the closed-loop seismograph system are bounded by using a Lyapunov function and a timing stability criterion.

The invention relates to a chaotic particle swarm multi-objective optimization method based on a three-phase three-switch two-level rectifier, which comprises the following steps of: firstly, establishing a three-phase three-switch two-level rectifier model based on PI control under a two-synchronous rotating coordinate system; analyzing the current inner ring and the voltage outer ring respectively to obtain the influence of control parameters on the system, selecting a total harmonic distortion rate, a DC voltage error absolute value integral and a time multiplied by the error absolute valueintegral as a chaotic particle swarm optimization objective function of the three-phase three-switch two-level rectifier according to the relation between the controlled quantity and the system control parameters; initializing a particle swarm by utilizing a unidirectional coupling mapping lattice space-time chaotic model, setting model simulation parameters according to the obtained optimizationresult, and building a chaotic particle swarm multi-objective optimization (CPSO) optimization model; finally, achieving the feasibility of the method through simulation experiments and analysis experiment results. Aiming at the problems of voltage imbalance and load sudden change of a three-phase power grid in practical application, the output performance and the adaptability of the three-phasethree-switch two-level rectifier can be improved.

The invention discloses a unidirectional coupling overspeed brake-type minecart with a toothed brake rail. A brake anti-run-away component is mounted on a machine frame in the direction of the forward motion of the minecart; the toothed brake rail is arranged parallel to the minecart rail and is fixedly mounted between two minecart rails; uniform tooth structures are arranged in the front-rear direction of the upper plane of the toothed brake rail; the brake anti-run-away component comprises an overspeed run-away information collecting and transmitting device, a brake device and a reset device which are arranged corresponding to the toothed brake rail in position; the overspeed run-away information collecting and transmitting device comprises a gear ring, a transmission gear, a transmission shaft, a transmission sleeve and a transmission sleeve axial moving mechanism; the brake device comprises a brake arm and a brake compression spring mechanism; the brake arm is mounted on the minecart axle in a sleeving manner; a brake shaft is arranged at the end of the brake arm; the brake compression spring is positioned and propped against the brake arm and the machine frame; and the reset device comprises a vertical connecting bar and a reset lever. The unidirectional coupling overspeed brake-type minecart disclosed by the invention is simple in structure, and convenient to mount, disassemble and maintain, and rapid mechanical brake in case of run-away accidents can be performed.

The invention relates to a device, transmission and universal mechanical coupling of forces having different magnitudes and directions (d.t.u.m.c). The utility model relates to a device, transmission and universal coupling which makes it possible to convert rotational forces of different magnitudes and directions applied on the same rotor shaft (1) and achieve unidirectional movement of an output rotor shaft (2) which can be used in any medium. The device consists of an input shaft (1), an output shaft (2) and two means (3 and 5) and (4, 9, and 6) for linking said two shafts (1 and 2)which each have at least one unidirectional coupling device (7a, 7b), and that, in the most basic form thereof, lacks a rotation inverter (15a).

A cap for medical fluid lines and the like includes a hollow body within which a male or female connector accessible at one end of the body is coaxially housed. The connector is configured to inviolably obstruct the passage through the body. A unidirectional coupling locks in rotation the connector with respect to the body in the direction corresponding to the screwing of the connector, and a complementary connector, and to enable free rotation of the connector in the opposite direction. The connector can be possibly locked in rotation with respect to the body in the unscrewing direction, only following a positive command.

The invention discloses a power synthesis amplifier, and an implementation method, device and system, and the method comprises the steps that multi-stage waveguide power divisionis conducted on an input signal through a waveguide power division unit, and a to-be-displayed input power is obtained after one path of input signal passes through a unidirectional coupling detection unit at an input end;and after being amplified by a power amplification unit and synthesized by a waveguide synthesis unit in sequence, the multiple paths of input signals subjected to multi-stage waveguide power division pass through a bidirectional coupling detection unit at an output end to obtain output power to be displayed. By adopting the integrated design of power division, amplification, synthesis, couplingand detection, the output path is shortened, the path loss is reduced, the synthesis efficiency is improved, and the display of the input power and the output power obtained by completing coupling detection through the unidirectional coupling detection unit at the input end and the bidirectional coupling detection unit at the output end is realized.