60 results about "Physical law" patented technology

The invention provides a wireless local area network security communication method based on quantum key distribution. The method comprises the following steps that: (1) identity authentication based on quantum keys is carried out; (2) quantum key negotiation is carried out; and (3) encryption is started. With the method of the invention adopted, information exchange between a faked access point and an applicant, the waste of system resources or a caused denial of service attack can be can avoided; bidirectional authentication between the applicant and an authentication server as well as between the applicant and an authenticator can be realized, and therefore, the security of the identity authentication is greatly improved; keys produced in the identity authentication can be adopted to protect message authentication in key negotiation, and therefore, attacks such as the tamper of a intermediary can be prevented; the security of key negotiation based on quantum technology is guaranteed by physical laws, and therefore, the key negotiation based on quantum technology has undecodability, and can withstand the decoding of a quantum computer with strong computational ability, and therefore, the security of a whole system can be enhanced.

A control system using a genetic analyzer based on discrete constraints is described. In one embodiment, a genetic algorithm with step-coded chromosomes is used to develop a teaching signal that provides good control qualities for a controller with discrete constraints, such as, for example, a step-constrained controller. In one embodiment, the control system uses a fitness (performance) function that is based on the physical laws of minimum entropy. In one embodiment, the genetic analyzer is used in an off-line mode to develop a teaching signal for a fuzzy logic classifier system that develops a knowledge base. The teaching signal can be approximated online by a fuzzy controller that operates using knowledge from the knowledge base. The control system can be used to control complex plants described by nonlinear, unstable, dissipative models. In one embodiment, the step-constrained control system is configured to control stepping motors.

The invention relates to a parameter identification based multi-motor servo system synchronization and tracking control method. The parameter identification based multi-motor servo system synchronization and tracking control method comprises the steps that 1, a multi-motor driven servo system containing unknown parameters is analyzed, and a mathematic model of the multi-motor driven servo system containing unknown parameters is established according to a motor structure and a physical law; 2, a load model established in the step 1 is analyzed, and unknown parameters in the load are estimated by utilizing a variable-gain self-adaptive parameter identification method; 3, synchronization and tracking control is conducted on the multi-motor driven servo system by utilizing neural network integral sliding-mode control algorithm according to a parameter identification result obtained in the step 2. The control method can ensure the steady-state accuracy of synchronization and tracking, effectively ensure transient-state and steady-state performance of parameter estimation, decrease the complexity and calculated quantity of algorithm design and effectively improves the response speed and robustness of the multi-motor driven servo system.

The invention relates to a segment neural network friction model based dual-motor servo system control method and belongs to the technical field of electromechanical control. The method includes: firstly, analyzing a dual-motor drive servo system with friction, and establishing a mathematical model of the dual-motor drive servo system with friction according to a mechanism modelling method as well as the structures of motors and the physical law; secondly, analyzing a friction term fi in the mode, and utilizing a segment neural network to establish a friction model of the nonlinear friction fi so as to obtain a segment neural network friction model; thirdly, utilizing a terminal sliding mode control algorithm to acquire a synchronous motor speed control law, and performing synchronous tracking control on the dual-motor servo system according to the control law. By the method, influence on the dual-motor system due to friction can be eliminated, the dual-motor system has better transient performance, tracking response speed of the dual-motor servo system is increased effectively, and fast synchronization of the dual-motor system can be guaranteed.

The invention discloses an ultra-short baseline underwater positioning method based on an active target detection principle. The method comprises the following steps of adopting a microcontroller to generate a GOLD sequence; adopting a modulator to modulate a sinusoidal signal and form a modulating signal according to the GOLD sequence; adopting a matching amplifier to matching and amplifying the modulating signal; adopting an energy converter to emit an ultrasonic incident wave according to the matched and amplified modulating signal; adopting a receiving array to receive a reflected ultrasonic echo wave as the ultrasonic incident wave is contact with an object to be positioned; adopting a filter amplifier to filter and amplify the ultrasonic echo wave; adopting the microcontroller to collect and demodulate the filtered and amplified ultrasonic echo wave to obtain an echo wave sequence signal; utilizing an FFT (Fast Fourier Transform Algorithm) to calculate the period and the phase position of the echo wave sequence signal; adopting a relationship between a physical law and a solid geometry to obtain a three-dimensional coordinate of the object to be positioned according to the period and the phase position. The invention also discloses an ultra-short baseline underwater positioning system based on the active target detection principle. The method and the system can realize multisystem and multitarget detection.

The invention discloses a differential light beam image motion and scintillation laser radar turbulence profile real-time measuring method. According to physical laws that intensity scintillation is sensitive to the intensity of atmospheric turbulence at a beacon end, and beam jitter is sensitive to turbulence at a receiving end, the invention adopts a method for carrying out simultaneous statistics on intensity scintillation and beam jitter information of a laser beacon obtained after passing through atmosphere; through differentiate operation, a pair of parameters sensitive to the beacon-end turbulence and the receiving-end turbulence can be obtained; and therefore, influence of laser upward transmission, apparatus jitter or inherent scintillation of laser on measurement can be eliminated, and interference of turbulence randomicity on measurement is reduced. On the basis above, the method adopts a double-exponential model of turbulence intensity to describe finite-height turbulence intensity height distribution; according to physical meanings of each exponential term in the model, experience statistical value of coefficient of one exponential term is adopted, and inversion is carried out in real time to obtain coefficient of another exponential term; and through real-time-measurement differential flutter and differential scintillation exponential term coefficient inversion, turbulence intensity height distribution data can be obtained in real time.

The invention discloses a novel composite control method based on a disturbance observer. The method can be used for suppressing mismatch disturbance in a voltage control type magnetic bearing system.The method is characterized by establishing a dynamic model of the voltage control type magnetic bearing system based on physical laws under mismatch disturbance; re-constructing an equivalent magnetic suspension rotor dynamic system by introducing a new state variable; and in the equivalent system, dividing mismatch disturbance into match and mismatch parts, wherein the match part is subjected to interference suppression through a robust controller, and the mismatch part is subjected to interference offset by designing a state space disturbance observer. The provided mismatch disturbance control method has important reference significance for high-precision suspension control of a magnetic bearing system.

The invention provides a real-time monitoring method of each component beam intensity and injection dosage of mixed ion beams. The monitoring method is based on the fact that magnification coefficient is only related with intrinsic property of incidence ions if material quality and thickness of a solid slice remain unchanged when the ions penetrate through the solid slice, and magnification coefficient of the beams changes with change of the material quality or the thickness of the solid slice. Change of strength or integral quantity of the beams around the time when the incident mixed ions penetrate through the solid slice is measured according to the physical law and characteristics, so that beam strength or injection dose of each ion component can be determined when the mixed ion beams irradiate samples. The real-time monitoring method has no special limit on type and number of each component ion of the mixed ion beam to be measured, mutual proportional relation between beam strength and stability. The real-time monitoring method is simple and clear, low in cost and reliable in use.

Graphic arts software has evolved to provide users with a variety of mark making tools to simulate different brushes, papers, and applied media such as ink, chalk, watercolour, spray paint and oils. However, in many instances the marks rendered appear unnatural and artificial despite the software's goal being to simulate as realistically. Accordingly, it would be beneficial to provide either users or the software application with a mechanism to remove or reduce artifacts indicative of artificial generation, e.g. rapid transitions. Further, in many instances the graphic images generated and/or manipulated refer to imagined environments or have elements that are physical in nature. Accordingly, it would be beneficial to provide users with a range of mark making tools that represent marks made by mark making tools comprising multiple elements following physical laws.

The invention relates to a particle pair establishment method for SPH theory-based helicopter water landing load calculation. The method comprises the steps of 1, establishing a water domain background mesh, wherein the length of the mesh is k1+delta; 2, setting an upper limit value of delta for preventing introduction of wrong particle pairs; and 3, according to a physical law of water flow, setting a lower limit value of delta. According to the particle pair establishment method for the SPH theory-based helicopter water landing load calculation, the purpose can be achieved only by adding simple judgment statements in a calculation process, so that the workload is very small and the calculation is accurate.

The invention relates to the detection on the goaf overlaying strata caving height under a metal mine room-and-pillar method mining conditions. The prediction method is used for determining the physical relation between the overlaying strata height and the ore body thickness, mining depth, construction stress, goaf size and overlaying strata features by using a dimension homogenous principle of the physical law. The method comprises the following steps of firstly, actually measuring on site or indoor measuring the data of the ore body thickness d, mining depth h, construction stress sigma h, goaf area s, rock unit weight gamma, rock loosening coefficient k and hardness coefficient f; substituting the data measured in the step I into a formula: lgH/d=2.1185-1.2359lg gamma ·d/ sigma h+1.3204lgf-3.0502lgk-0.9582lgh/d+0.0114lgS/d2 to obtain the mine goaf overlaying strata caving prediction height H. The method is strong in practicability, safe (without the operation that a person enters a shaft), compact and economic in the complementation process, and avoids the high hazard of the on-site actual measuring on the goaf overlaying strata caving height.

The invention discloses an engineering safety monitoring system area division method based on a measuring point space-time characteristic. The method comprises two phases of measuring point space-time characteristic expression and area division. In the measuring point space-time characteristic expression phase, a time-sequence noise reduction automatic encoder is used to compress a high-dimensional monitoring data table and increase a measuring point time sequence characteristic, and measuring point spatial characteristics (coordinate position information, measuring point attributes and the like) are represented through a normalization method. In the area division phase, an area division method based on the measuring point space-time characteristic is adopted, and an auxiliary target variable optimization area is used to divide a target function so that an area division result reflects a physical law of operation of a structural body, and a global security evaluation problem is divided into a local single domain. In the invention, through analyzing a measuring point monitoring data change rule, comprehensive evaluation of a dam operating condition is realized and a decision-making basis is provided for engineering safety analysis.

Embodiments of the present invention provide a single photon based measurement device independent quantum communication system. The single photon based measurement device independent quantum communication system includes a transmitting end, a receiving end, and a third party; the transmitting end and the receiving end respectively prepare a first photo subsequence and a third photo subsequence forsecurity detection and send the first photo subsequence and the third photo subsequence to the third party for measurement, and then the transmitting end and the receiving end perform security detection according to the measurement result; after the security detection is passed, the transmitting end loads the information to be transmitted into a pre-constructed second photonic sequence, and transmits the information to the third party; the third party transmits a measurement result of the second photo subsequence to the receiving end so as to complete a communication process. The system can still achieve the absolute communication security guaranteed by the physical law while the measurement job is completely handed over to the third party, and ensures that only the receiving end can decode information transmitted by the transmitting end from information announced from the last third party.

The invention discloses a flat sample unsaturated soil triaxial test-based volume measurement device and a measurement method thereof. The measurement device comprises a horizontal transverse transparent calibrated scale, a horizontal longitudinal transparent calibrated scale, a vertical transparent calibrated scale, a supporting pole, a horizontal transverse steel needle and a horizontal longitudinal steel needle. The invention has the following advantages: the device and the method are suitable for unsaturated soil; the device is aimed at flat small samples, thickness of which is less than thickness of conventional triaxial samples; soil-water characteristic curve test time is greatly shortened; by ingenious utilization of the physical law that a convex mirror has an amplifying effect, a pressure chamber cover and confining pressure water form a convex mirror, a person watches the orthographic reading of an end of the steel needle projected on the scale, the orthographic projection on the scale is clear for distinguishing, and the reading is accurate; according to the trapezoid median line theory, diameter of a sample is calculated through the reading of the steel needle on the transparent calibrated scale, errors caused by installation of the steel needle are eliminated by the calculation method, and the result is more accurate; and the device has reasonable principle, has high measurement precision and is simple and economical.