7results about How to "Improve dynamic characteristics" patented technology

This invention belongs to the field of robot joint technology, specifically relating to a rope-driven, decoupled, dual-parallel five-DOF bionic shoulder joint, including a scapulothoracic joint mechanism, a glenohumeral joint mechanism, a drive base device, and drive ropes. The scapulothoracic joint mechanism and the glenohumeral joint mechanism are internally rotatably connected. The drive base device is used to fix the scapulothoracic joint mechanism and to provide drive ropes for both mechanisms. The scapulothoracic joint mechanism is constrained by a first constraint branch, a second constraint branch, and a decoupling through-line branch, satisfying the pure rolling two-DOF rotation requirement, driven by two sets of antagonistic drive ropes. The glenohumeral joint mechanism is driven by four independent drive ropes to achieve three-DOF rotational motion. The decoupling through-line branches distribute the drive ropes of the glenohumeral joint mechanism, achieving physical decoupling and ensuring that the drives of the two mechanisms do not interfere with each other. Through rope-driven and dual-parallel passive mechanisms, a larger range of motion can be achieved, improving the stiffness and load-bearing capacity of the mechanism.

This invention provides a wind-powered propulsion device. One technical solution of this invention provides a wind-powered propulsion device disposed on a moving body, receiving wind to generate propulsion force. The wind-powered propulsion device comprises: a rotating body having a frame portion formed in an annular shape around a rotation axis, and capable of rotating around the rotation axis; and a plurality of blades, each fixed to the frame portion, and configured such that an imaginary straight line connecting the two ends of each blade in a direction orthogonal to the rotation axis is parallel to the frame portion. The plurality of blades includes a central blade whose imaginary straight line connecting the two ends of each blade passes through the center of the frame portion.

This invention discloses a method and system for estimating fuel cell parameters based on adaptive subset simulation. It transforms the updating of the posterior distribution of parameters into a structural reliability problem, constructs a limit state function using measurement data to form an intermediate failure domain, and generates conditional samples using the MCMC method to progressively approximate the target posterior probability distribution, thereby achieving parameter estimation of the fuel cell system. This method does not require a Gaussian prior assumption, can adaptively adjust algorithm parameters to ensure the reliability of the estimation results, and can comprehensively characterize the probability distribution of unknown parameters, achieving accurate estimation of fuel cell system parameters.

The application discloses a kind of laser scanning cutting endoscope robots based on carbon fiber paper micro-vibration mirror, the endoscope robot is fixedly installed with paper transmission structure in one end of support structure, and the other end is fixedly installed with GRIN lens;Fixed mirror, X galvanometer and Y galvanometer are fixedly installed in paper transmission structure, and optical path is formed by optical fiber, GRIN lens, fixed mirror, X galvanometer and Y galvanometer;First piezoelectric bimorph driver and second piezoelectric bimorph driver are piezoelectric bimorph driver installed between support structure and paper transmission structure;First piezoelectric bimorph driver is used to drive X galvanometer to rotate around Y axis and / or by paper transmission structure;Second piezoelectric bimorph driver is used to drive Y galvanometer to rotate around Z axis by paper transmission structure.The above-mentioned endoscope robot is compact, light, stable in motion and has excellent dynamic performance by using piezoelectric bimorph driver and paper transmission structure.

This disclosure relates to a valve assembly for a shock absorber. The valve assembly includes: a valve housing including a first port and a second port; a pilot chamber in fluid communication with the first port and / or the second port, a pilot pressure determined by hydraulic pressure in the pilot chamber; and a main valve member axially movable within the valve housing along a longitudinal axis to restrict the main fluid flow between the first port and the second port in response to the pilot pressure acting on the main valve member. Furthermore, the main valve member is elastically loaded in a steady-state position, from which it is movable in two directions along the longitudinal axis and configured to move away from the pilot chamber during an initial pressure increase in the main fluid flow. The invention also relates to a method for controlling the flow of damping medium in a shock absorber.

The application discloses a kind of HEMT device structures and methods of inhibiting current collapse.The HEMT device structure of inhibiting current collapse includes: epitaxial structure, including the heterojunction of sequentially arranged along first direction, P-type semiconductor layer and n++ type heavily doped layer, the heterojunction has carrier channel, and the conduction band of the carrier channel is pulled down to Fermi level below by n++ type heavily doped layer;And, source, drain and gate, the source, the drain is electrically connected with the heterojunction, the gate is arranged on the P-type semiconductor layer, the gate is arranged between the source and the drain along second direction, and the second direction and the first direction are cross arrangement.The application avoids additional semiconductor manufacturing processes, such as etching, ion implantation, etc., in the vicinity of gate, avoids introducing a large number of surface states, so as to improve the dynamic characteristics of device.

The application discloses a sawtooth optimization method based on t-distribution cumulative distribution and a disc saw preparation method. The disc saw preparation method is innovative in constructing a sawtooth profile by using a Student-T distribution CDF curve in view of the problems of stress concentration, loud noise and short service life of a traditional sawtooth, and controls tooth profile curvature through a degree of freedom v parameter to realize continuous and smooth transition from a tooth root to a tooth top. The method comprises the following steps: design parameter input, single-tooth reference profile generation, single-tooth profile discretization and coordinate conversion, tooth back and chip space construction, circular array replication, three-dimensional model generation and verification and manufacturing data output, and a tooth profile suitable for different requirements is obtained by adjusting the v value, and an optimal profile disc saw is output, so that the cutting noise of the disc saw is reduced, the tool life is prolonged, and the machining quality and efficiency are significantly improved.