11results about How to "Guaranteed achievability" patented technology

The invention relates to a low-fault-energy micro-twin synergistic deformation cobalt-based alloy and a preparation method thereof, and belongs to the field of cobalt-based high-temperature alloys. According to the alloy, on the basis of Co-Al-W, Ti and Ta which are smaller than or equal to 4 wt% are added according to calculation of a first principle, and the stacking fault energy is controlled to be-95 mJ / m < 2 > to-89 mJ / m < 2 > (0K). Aiming at the defect of insufficient high-temperature plasticity of the gamma '-phase strengthened cobalt-based alloy, an electronic structure is accurately regulated and controlled through a first principle, intrinsic stacking fault energy is designed to reach an optimal negative value interval, a micro-twin mechanism is activated, dislocation slippage and micro-twin coordination is realized, and the problem of sudden plasticity drop caused by single deformation mechanism (dislocation slippage leading) and grain boundary weakening of a traditional alloy is solved; the high-temperature strength and the plasticity are synchronously improved.

The invention provides a physical layer secure transmission method based on multipath selection independent transmission, which comprises the following steps of: firstly, acquiring multipath channel state information of legal users by using a large-scale MIMO (Multiple Input Multiple Output) channel estimation method; and secondly, performing multipath selection based on the multipath channel state information, matching an additive uniquely decomposable constellation group according to the multipath number, performing precoding design, and eliminating symbol interference among multiple paths, so that a legal user side receiving signal meets the sum constellation design of the additive uniquely decomposable constellation group, and further realizing accurate detection of a receiving symbol. In a single-user scene, the method only needs to perform multipath selection so as to improve the secrecy capacity. In a multi-user scene, a multi-path and user two-stage selection process needs to be carried out, that is, multi-path selection is carried out on multiple users to determine an optimal path combination, and then user selection is carried out based on the optimal path combination of each user, so that the secrecy capacity of the system is improved.

The present application relates to finite time reduced dimension observer design method and chaotic communication system, belong to information security and chaotic communication field. In view of the defects of traditional asymptotic observer slow, time is uncontrollable, sliding mode method exists chattering and message signal pollution output is difficult to construct observer, the present application establishes the chaotic drive system containing message signal embedding, constructs the equivalent system without unknown signal, designs finite time reduced dimension observer based on observer matching condition and strong observable condition. Compared with the traditional asymptotic convergence observer method, the present application can realize the complete synchronization of chaotic system within the user preset time, adopts continuous control law without chattering, and the message signal can be accurately recovered through algebraic formula. The synchronization time of the present application is controllable, the convergence speed is fast, the recovery precision is high, and the robustness is strong, which is suitable for various chaotic secure communication scenes, effectively improves the communication real-time, security and engineering practicability.

The present application relates to the technical field of ultra-precision machining control, and particularly relates to a modal controller generation method for a nano-positioning platform, a medium and equipment. The present application performs zero-pole decomposition on a transfer function of a controlled object, separates stable zero points, unstable zero points, non-resonant poles and resonant poles, constructs a desired inner loop closed-loop transfer function, retains the stable zero points, the unstable zero points and the non-resonant poles, and replaces the resonant poles as a whole with high-damping desired poles, inversely solves to obtain a modal controller structure, introduces zero-pole cancellation constraints to eliminate controller instability caused by unstable zero points, introduces order constraints to ensure causal realizability, applies constraints with a damping ratio greater than 0.1 to the desired poles and the introduced new zero points respectively, and outputs an inner loop modal controller. The present application realizes simultaneous suppression of multiple resonant peaks, gets rid of dependence on a low-order model, ensures stability, realizability and smoothness of a control signal of the controller, and significantly improves control bandwidth and dynamic performance.

The invention discloses a method and device for optimizing the sound effect in a passenger vehicle cabin, and relates to the technical field of vehicle-mounted audio signal processing, and the method comprises the steps: obtaining an initial reference response vector representing the factory ideal state of a loudspeaker; when the monitoring trigger condition is met, controlling a power amplifier to generate a standard test excitation signal to drive a loudspeaker group, and constructing a current state response vector through a voice acquisition unit; constructing a spectrum deviation vector based on the difference value, and eliminating the frequency response interference of the acquisition unit by using a relative measurement mechanism; calling a preset sound field transfer function matrix model, taking the spectrum deviation vector as input, and calculating a channel gain adjustment vector through an inverse problem solving algorithm containing regularization constraint; and finally, updating audio processing parameters according to the vector and executing closed-loop checking. According to the invention, by using the existing vehicle-mounted hardware, automatic monitoring and accurate compensation of the aging characteristic of the loudspeaker are realized, and the sound effect consistency in the vehicle life cycle is effectively maintained.

The application discloses a kind of small concave Offner spectral imaging systems based on active optics, design method and aberration correction method, belong to spectral imaging technical field.The system includes the concave spherical surface reflection main mirror of ball center coincidence, convex spherical surface grating and deformable concave spherical surface reflection three mirrors;Light beam is shot into by incidence slit, is reflected to grating spectroscopy by main mirror, then is imaged after being reflected by three mirrors.Design method adjusts curvature radius ratio and off-axis amount to make astigmatism meet requirements to determine initial structure, and surface shape coefficient is solved after optimization and surface shape is iteratively adjusted to within range.Aberration correction method is solved by constructing wave aberration matrix and driver response matrix to correct aberration.The application realizes the imaging of super-long slit large field of view at the same time, simple structure, easy to assemble and adjust, can realize the integration of large field of view general survey and local high-resolution detailed survey imaging.

This invention discloses an additive manufacturing-based inertial amplification nonlinear low-frequency vibration isolation metamaterial structure, vibration isolation device, and its performance control method. The vibration isolation metamaterial structure includes a rhombic frame structure, an inertial amplification unit, and a square spring structure. The square spring structure is arranged within the rhombic frame structure, with its two ends connected to a pair of opposite corners of the rhombic frame structure. The elastic extension direction of the square spring structure is parallel to the diagonal of this pair of opposite corners of the rhombic frame structure. The inertial amplification unit has a centrally symmetrical structure, including a rigid rod, two counterweights, and two diagonal rods. The center of symmetry of the inertial amplification unit, the center of the rhombic frame structure, and the center of the square spring structure all coincide in projection. Therefore, the vibration isolation metamaterial structure of this invention significantly widens the bandgap range and enhances low-frequency vibration isolation performance, exhibiting excellent performance in suppressing longitudinal waves in the 0-1000Hz low-frequency range, increasing vibration damping, and energy absorption.

The invention discloses a quad-rotor unmanned aerial vehicle adaptive fault-tolerant control method based on event triggering. For actuator multiplicative / additive faults caused by motor efficiency degradation, centroid offset and the like, an attitude-position unified dynamical model is established under external disturbance, and a position-attitude double-ring structure is adopted: a position ring generates an expected attitude and total thrust by using a radial basis function neural network (RBF) backstepping adaptive control; the attitude ring compensates a composite fault based on RBF backstepping adaptive control, introduces an event trigger mechanism, updates control input only when an error exceeds a threshold value, and maintains the control input at a zero order at other moments. A Lyapunov method proves that a closed-loop system realizes consistent final bounded stability in the presence of a composite fault and external disturbance, and a trigger interval right lower bound is given to avoid a Zeno phenomenon. According to the method, the trajectory tracking precision can be improved and the calculation and communication overhead can be reduced under the fault working condition without adding hardware, and a powerful reference is provided for specific implementation of engineering practice.

The utility model provides an air outlet assembly and an air conditioner indoor unit with the same. The air outlet assembly comprises a framework, a mounting frame and an air outlet frame. And an air outlet channel is arranged on the framework. And the mounting frame is arranged in the air outlet channel. The mounting frame is provided with a mounting hole and a notch penetrating through the peripheral wall of the mounting hole. The air outlet frame is rotatably arranged in the air outlet channel. A first rotating shaft is arranged on the air outlet frame and installed in the installation hole through the notch. The problem that the air outlet frame needs to move by a large distance in the axial direction of the rotating shaft in the installation process of the air outlet frame under the condition that the connection stability of the rotating shaft is guaranteed, so that the air outlet frame is prone to being interfered by a framework or other parts of the indoor unit of the air conditioner can be solved, and the purpose that installation of the air outlet frame is easier to operate is achieved.

This invention relates to the field of ridge filter design technology, and discloses a design method, system, device, and storage medium for ridge filters. The method includes acquiring first and second actual water depth dose distribution data for proton and heavy ion beams with multiple energies; performing Monte Carlo simulation on the proton and heavy ion beams to obtain a Monte Carlo beam model; constructing a geometric optimization model for the ridge filter using its geometric parameters as optimization variables, maximizing its performance index as the objective function, and using geometric parameter constraints as constraints; and solving the geometric optimization model using a particle swarm optimization algorithm to obtain the optimal geometric parameters. This invention can improve the parameter design accuracy of ridge filters, reduce the processing accuracy requirements of ridge filters, improve the flatness of the effective biological dose in the extended Bragg peak, and reduce the radiation risk from secondary neutrons.

This invention relates to the field of wireless communication and signal processing technology, specifically to a shortwave spectrum high-efficiency sampling method and system based on compressed sensing. The method includes: acquiring power spectral density data across the entire frequency band using a low-speed scanning receiver; determining a set of strong interference frequency points; generating a binary null observation sequence; loading the binary null observation sequence onto an analog front-end mixer circuit to perform analog domain orthogonal mixing and integration processing on the input RF signal, outputting voltage sample values; calculating signal sparsity coefficients using a compressed sensing reconstruction algorithm; calculating the reconstruction residual based on the voltage sample values ​​and the signal sparsity coefficients; triggering a re-acquisition process of power spectral density data in response to the reconstruction residual exceeding a preset error threshold; and outputting the signal sparsity coefficients in response to the reconstruction residual being less than or equal to the preset error threshold. This invention solves the problems of limited dynamic range and weak signal overload, significantly improving the receiving sensitivity of weak signals under strong interference environments.