304results about How to "Reduce order" patented technology

Multiple designs, systems, methods and processes for controlling a system or plant using an extended active disturbance rejection control (ADRC) based controller are presented. The extended ADRC controller accepts sensor information from the plant. The sensor information is used in conjunction with an extended state observer in combination with a predictor that estimates and predicts the current state of the plant and a co-joined estimate of the system disturbances and system dynamics. The extended state observer estimates and predictions are used in conjunction with a control law that generates an input to the system based in part on the extended state observer estimates and predictions as well as a desired trajectory for the plant to follow.

Thermochromic filters are constructed using absorptive, reflective, or fluorescent dyes, molecules, polymers, particles, rods, or other orientation-dependent colorants that have their orientation, order, or director influenced by carrier materials, which are themselves influenced by temperature. These order-influencing carrier materials include thermotropic liquid crystals, which provide orientation to dyes and polymers in a Guest-Host system in the liquid-crystalline state at lower temperatures, but do not provide such order in the isotropic state at higher temperatures. The varying degree to which the absorptive, reflective, or fluorescent particles interact with light in the two states can be exploited to make many varieties of thermochromic filters. Thermochromic filters can control the flow of light and radiant heat through selective reflection, transmission, absorption, and / or re-emission. The filters have particular application in passive or active light-regulating and temperature-regulating films, materials, and devices, and particularly as construction materials and building and vehicle surfaces.

Systems and methods for regulating the throughput of a channel between a gateway and one or more subscriber terminals are disclosed. Various embodiments of the invention provide for monitoring link utilization between a gateway and a subscriber terminal at, for example, the physical layer of the OSI model. Based in part on the link utilization the link throughput may be throttled at a layer higher than, for example, the transport layer. Regulating may occur by advertising a decreased TCP window size or intelligently dropping packets. In another embodiment, a subscriber terminal may estimate the signal to noise ratio of a forward link channel and communicate this SNR to the gateway. The gateway may adjust the modulation and / or coding of the signal in response to the SNR. The gateway may also throttle deliver of packets in response to changes these changes in the modulation and / or coding of the signal.

The invention discloses a wind power plant parameter identification and dynamic equivalence method based on operation data, comprising the following steps of a) performing recognition on wind generation set control model parameters based on testing data, b) combining with operation data and choosing characteristic variables reflecting the wind generation set and the wind power plant under influence and utilizing the improved fuzzy K average value dynamic clustering algorithm to perform cluster division, c) performing network simplification and parameter optimizing to obtain a wind power plant dynamic equivalence model based on global optimal position mutation particle swarm algorithm, and d) under disturbance input, comparing the wind power dynamic equivalence model with the detailed model dynamic respond to verify the validity of the equivalence model. The wind field dynamic equivalence model constructed by the invention can accurately reflect the dynamic characteristics of grid-connection points of the wind plant and have important construction application values, and can be used in the analysis of the stability of the double-fed wind power plant access power system and provide theory support for the programming and operation scheduling of the wind power plant power system.

The invention discloses a method for identifying an RC (resistor-capacitor) equivalent model of a power battery. The method comprises the following steps of: confirming an identification equation of the RC equivalent model, acquiring identification data, calculating an internal discharge resistance of the battery and identifying a least square method. According to the method, the dynamic and static features of the battery are reflected well; on one hand, the model has a relatively high precision characterization electric quantity parameter, and the charge and discharge behaviors of the battery can be simulated accurately under the condition that the temperature, the current and the internal resistance difference in the charge and discharge process are considered; and on the other hand, the model is relatively low in order, so that complex mathematic calculation is avoided, and the structure is relatively simple, thereby being conveniently processed in a computer. Therefore, the method for establishing a mathematic model by using the method for identifying the RC equivalent model of the power battery can be widely used in the research of the power battery, and particularly the research of a lithium ion battery.

The invention relates to an interference elimination system and method based on pre-equalization and belongs to the field of communication and signal processing. At a receiving end, a received signal is divided into two paths, one path signal is sent to an interference elimination self-adapting filter and serves as an input signal of the interference elimination self-adapting filter, the other path signal is sent to a pre-equalization computing module, weight is computed by the pre-equalization computing module according to the received signal or a channel estimated value, and the computed weight is enabled to be sent to a pre-equalizer of an interference emission end. At the interference emission end, an emission signal is divided into two paths, one path signal serves as a referential signal and is sent to the interference elimination self-adapting filter at the receiving end, the other path signal is sent to the pre-equalizer, and pre-equalization processing is carried out on the emission signal by the pre-equalizer and then the emission signal is sent out. Compared with a traditional interference elimination method, the interference elimination method is capable of simplifying work of the interference elimination self-adapting filter and effectively eliminating broadband self-interference signals.

The invention discloses a controllable electromagnetic mixed coupling coaxial cavity filter, comprising a conductor housing with two or more resonant cavities opened inside, the top of which is sealed by a conductor cover board and which is provided with a through hole; an input / output device penetrates through the through hole on the conductor hosing; bottoms of two or more conductor resonators are fixed to the conductor housing in contact with the guide housing to form short circuit; the conductor cover board opposite to the tope of the conductor resonator is provided with a tuning screw; an electromagnetic mixed coupling control component is arranged between two adjacent guide resonators which need electromagnetic mixed coupling. The invention accomplishes elliptic filter characteristic with a coaxial cavity filter only with main coupling path, which is provided with the following advantage of small volume, low cost, little insertion loss and nonsymmetrical response.

A digital signal processing system for multiplexing / demultiplexing a large number of closely spaced FDM channels in which sub-band definition filtering divides the FDM spectral band comprised of "N" channels into "K" sub-bands in order to reduce the dimension of the polyphase filter fast Fourier transform structure required to complete the multiplexing / demultiplexing. This reduces the order of the required prototype filter by a factor proportional to K. The number of sub-bands K is chosen so that it is large enough to ensure the polyphase filter, fast Fourier transform structure for each sub-band is realizable within a finite word length, fixed point arithmetic implementation compatible with a low power consumption. To facilitate efficient sub-band definition filtering, the real basebanded composite signal is inputted at a spectral offset from DC equal to one quarter the FDM channel bandwidth for the N channels and the signal is sampled at a frequency 50% greater than the applicable Nyquist rate. The quarter band spectral offset and oversampling by 50% above the theoretical Nyquist rate facilitate the use of computationally efficient bandshift and symmetric half-band Finite Impulse Response (FIR) filtering.

A thermochromic, thermotropic, or thermoreflective filter relies on a mismatch between the index of refraction of a thermotropic material (e.g., a liquid crystal) and a substrate material that includes refractive or diffractive features. At colder operating temperatures, the refraction mismatches are eliminated or minimized such that the filter becomes transparent, whereas at high operating temperatures the refraction mismatches are increased such that for light at appropriate incidence angles, the structure becomes highly reflective. This filter has particular but not exclusive application as a temperature-controlled “smart mirror” for use in windows, walls, roofing, and other building materials.

A liquid jet apparatus of the invention includes a drive waveform generator that generates a drive waveform signal, a modulator that pulse-modulates the drive waveform signal so as to produce a modulated signal, a digital power amplification circuit that amplifies the power of the modulated signal so as to produce an amplified digital signal, and a low pass filter that smoothes the amplified digital signal so as to produce a drive signal. The digital power amplification circuit includes multiple stages of digital power amplifiers each including a pair of switching elements that are push-pull-connected. The amplified digital signal is a multi-value signal that reaches a larger number of steps of electric potentials than the number of digital power amplifiers.

A liquid jet apparatus of the invention includes a drive waveform generator that generates a drive waveform signal, a modulator that pulse-modulates the drive waveform signal so as to produce a modulated signal, a digital power amplification circuit that amplifies the power of the modulated signal so as to produce an amplified digital signal, and a low pass filter that smoothes the amplified digital signal so as to produce a drive signal. The digital power amplification circuit includes multiple stages of digital power amplifiers each including a pair of switching elements that are push-pull-connected. The amplified digital signal is a multi-value signal that reaches a larger number of steps of electric potentials than the number of digital power amplifiers.

A server (120) uses a password (π) to construct a multiplicative group (ZN*) with a (hidden) smooth order subgroup (<x′>), where the group order (Pπ) depends on the password. The client (110) uses its knowledge of the password to generate a root extraction problem instance (z) in the group and to generate data (y) allowing the server to construct a discrete logarithm problem instance (y′) in the subgroup. The server uses its knowledge of the group order to solve the root extraction problem, and solves the discrete logarithm problem efficiently by leveraging the smoothness of the subgroup. A shared key (sk) can be computed as a function of the solutions to the discrete logarithm and root extraction problem instances. In some embodiments, in an oblivious transfer protocol, the server queries the client (at 230) for data whose position in a database (210) is defined by the password. The client provides (240) such data without knowing the data position associated with the server's query. The client obtains the data position independently from the password. The data positions and / or the respective data are used for authentication and shared secret key generation. Other embodiments are also provided.

Reading light (26) is phase-modulated by a phase-modulating spatial light modulator (12), the phase-modulated reading light (26) is Fourier-transformed, and an image of the Fourier-transformed reading light is focused on an output plane (24) to form an optical pattern. In this method, 0-order light in the phase-modulated reading light (26) is blurred on the output plane (24). As the 0-order light is blurred, the luminance of the 0-order light is reduced on the output plane (24). Since the 0-order light is not blocked, the shape of the optical pattern is not limited.

A computationally efficient digital signal processing (DSP) system is provided for multiplexing / demultiplexing a large number of closely spaced FDM channels. Sub-band definition filtering divides the FDM channel band, comprised of N channels into K sub-bands, in order to reduce the dimension of polyphase filter fast-Fourier transform for completing the multiplexing / demultiplexing. This reduces the order of the required prototype by a factor proportional to K and allows small size, lightweight DSP implementations.

This invention discloses one laser radar signal process method based on experience, which aims for laser radar signal and experience module analysis and combines small wave exchange theory and statistic test theory; using central limit theory and Late rules to test the random of the signal intensity; testing signal inverse part to keep analysis method without experience with remaining part using experience analysis method.

The invention discloses a PMSM stator flux linkage observation method which is characterized in that an extension flux linkage observer is established according to a motor stator voltage phasor u alpha beta, a stator current phasor i alpha beta and a rotor electric angular speed omega in a two-phase static coordinate system (alpha beta coordinate system for short), on the basis of the theory of a state observer and according to a mathematical model of the PMSM in the alpha beta coordinate system, the motor stator voltage phasor u alpha beta, the stator current phasor i alpha beta and the rotor electric angular speed omega are obtained through collection and calculation, and then the relation between the stator flux linkage and the extension flux linkage is utilized for observing a rotor flux linkage psis. According to the PMSM stator flux linkage observation method, the problem of direct-current bias and integral saturation caused by the pure integral stator flux linkage observation method can be solved, the problems of the amplitude value and phase deviation or waveform distortion caused by an improved integrator are solved, and the advantage that parameters of the pure integral stator flux linkage observer are good in robustness is reserved. Due to the fact that only a minimum-order observer is required, engineering practice is benefited. The stator flux linkage observation method can be applied to a surface-mounted-type SPMSM and an inserted-type SPMSM and have the advantage of being good in universality.

The invention discloses a blind identification method for punctured convolutional codes with a code rate of (n-1) / n. A mathematical model v(D)=m(D)G(D) for blind identification of the punctured convolutional codes is established at first, wherein, v(D) represents code output sequence; m(D) represents information sequence waiting for coding; G(D) represents generator polynomial matrix; on the ground that the code output sequence v(D), the generator polynomial matrix G(D) and a check polynomial matrix H(D) meet relational expressions G(D)H(D)<T>=0 and v(D)H(D)<T>=m(D)G(D)H(D)<T>=0, the check polynomial matrix H(D) is estimated by the v(D) at first and then the generator polynomial matrix G(D) is estimated, and finally the received code output sequence v(D) is combined and the information sequence m(D) is recovered. The blind identification method for the punctured convolutional codes with a code rate of (n-1) / n can identify the punctured convolutional codes more simply and more quickly and simultaneously solve the problem that initial place values of code words of the convolutional codes are fuzzy.

The invention discloses a cavity filter. The cavity filer comprises a metal cavity and a metal cover plate which is positioned on the metal cavity, wherein the metal cavity comprises at least eight resonance cavities which are coupled in sequence; a resonance rod is arranged in each resonance cavity; and the resonance rods in the first and the last resonance cavities are connected with an input signal connector and an output signal connector respectively. The coupling between the adjacent resonance cavities is magnetic coupling; coupling windows and coupling rods are arranged between the corresponding resonance cavities on the left and right sides of a passband; four places of crossed coupling is introduced, so that two transmission zero points can be generated on the left and right sides of the passband respectively, and higher out-of-band rejection can be achieved; the outline dimension of the overall filter cavity is not changed; the order of the filter is not increased, and the size of the filter is not enlarged; meanwhile, the cavity filter is easy to process and debug, and low in cost; and the large-batch production of the cavity filter can be achieved.

Multiple designs, systems, methods and processes for controlling a system or plant using an extended active disturbance rejection control (ADRC) based controller are presented. The extended ADRC controller accepts sensor information from the plant. The sensor information is used in conjunction with an extended state observer in combination with a predictor that estimates and predicts the current state of the plant and a co-joined estimate of the system disturbances and system dynamics. The extended state observer estimates and predictions are used in conjunction with a control law that generates an input to the system based in part on the extended state observer estimates and predictions as well as a desired trajectory for the plant to follow.

The invention relates to a calculation method for a fixed DC voltage controller parameter of a voltage source converter. An equivalent model of the voltage source converter comprises a three-phase equivalent power voltage, a power grid equivalent resistor, a power grid equivalent inductor and a voltage source converter and is characterized in that the method comprises the following steps of I, building a simplified equivalent model of the voltage source converter; II, building an electromagnetic transient model of the equivalent model; III, figuring out an active power small-interference linear model of the voltage source converter; IV, building a small-interference linear Thevenin equivalent model of the voltage source converter; V, building an equivalent DC system model and an equivalent DC system small-interference model of a fixed DC voltage controller of the voltage source converter; and VI, calculating the parameter of the fixed DC voltage controller of the voltage source converter. According to the method, the equivalent DC system small-interference model of the fixed DC voltage controller of the voltage source converter is built, the system order is reduced, and the accuracy of the controller parameter is improved.

The invention aims at providing a short-process efficient cold-rolling preparation method of a high-silicon steel thin strip. The preparation method is characterized in that the high-silicon steel thin strip is prepared by using a rapid solidification method, and the thickness of the high-silicon steel thin strip is reduced by using a cold rolling method, the surface quality is improved, and the high-frequency magnetic performance is improved; due to rapid solidification, the plasticity of high-silicon steel can be improved, and the thin strip with certain plasticity is obtained and can be wound into a coil; then, cold rolling is carried out, so that the degree of order of the high-silicon steel is further lowered, the plasticity of the high-silicon steel is improved, and a high-silicon steel thin strip coil is obtained; the thin strip obtained through rapid solidification has the advantages that the crystal grain size is obviously reduced, the degree of order is obviously lowered, and the microhardness change is not great, so that next-step cold rolling is facilitated; during cold rolling, the rolling reduction of first-time rolling is controlled, and then, the plasticity is further improved, so that the thin strip with the thinnest thickness of 0.02mm can be obtained. According to the preparation method, the production efficiency of the prepared high-silicon steel thin strip is high, and the product quality of the prepared high-silicon steel thin strip is good, so that the method can be widely implemented industrially and accordingly has a broad application prospect.

An A / D converter apparatus for converting an analog signal output from an anti-aliasing filter into a digital signal, a sinc filter for removing a frequency component corresponding to an aliasing noise generated by down-sampling, a first decimator for down-sampling a signal output from the sinc filter, a low pass filter for removing a frequency component corresponding to an aliasing noise generated by down-sampling, a second decimator for down-sampling a signal output from the low pass filter, and a high pass filter for removing a dc component from a signal output from the second decimator are disclosed.

The invention provides a liquid scintillator detector n / gamma ray screening method based on a support vector machine. The method includes the following steps that firstly, signals are collected, the signals generated by a neutron source are collected through a liquid scintillator detector, and the collected signals are transformed into pulse signals; secondly, neutrons and gamma rays are screened through a charge comparison method, the pulse signals obtained in the first step are screened through a traditional charge comparison method, and the lower limit of the screening energy of the neutrons and the gamma rays of the charge comparison method is determined; thirdly, an M matrix is obtained; fourthly, LIBSVM software is used for conducting classification forecasting on the neutrons and the gamma rays. The liquid scintillator detector n / gamma ray screening method can distinguish signals with energy below a screening threshold value in the traditional method, and therefore the accuracy of neutron flux measuring is easily improved.

The invention provides a element two-stage partition and twice polycondensation parallel method based on multiple document flows. The method includes the steps of firstly, dividing a finite element model into a plurality of initial sub-areas, and saving model information of each initial sub-area independently in a document; secondly, by each progress, simultaneously and independently forming a system equation of each sub-area, and performing polycondensation to remove internal freedom degree of each system equation; thirdly, by a local main process, forming packaging sub-area system equations, and performing polycondensation to remove internal freedom degree of each packaging sub-area system equation; fourthly, by the local main process, solving an interface equation, and solving the internal freedom degree of each packaging sub-area system equation by means of back substitution; fifthly, solving internal freedom degree of each initial sub-area according to results of the top packaging sub-areas by means of back substitution; terminating if iteration ends, or else starting again from the second step. On the basis of realizing distributed data storage, large-scale finite element parallel computing efficiency is increased by fully utilizing structural features of large-scale parallel computer systems by means of maximally realizing communication localization.

The invention discloses a passive time-reversal underwater acoustic communication method based on indirect channel function tracking. The method comprises the following steps: firstly, using a training sequence which receives a signal to estimate a channel time delay, namely a Doppler spread function; analyzing the Doppler extension phenomenon to implement indirect channel function modeling, then carrying out Doppler compensation on the received signal of each array element, carrying out time reversal processing on channel estimation obtained by an indirect channel function estimated by the training sequence and the signal compensated by Doppler, estimating and tracking the indirect channel function by using a Kalman / extended Kalman filter, judging whether a Doppler compensation factor and the channel estimation are updated or not according to a normalized amplitude of the estimated indirect channel function, and finally, recovering a transmitted symbol from the signal processed by time-reversal by utilizing a decision feedback equalizer which is less than ten orders. The method uses the tracking for the indirect channel function to confront the performance reduction of passive time-reversal communication caused by environment time-varying, thereby realizing the high-speed and stable uplink underwater acoustic communication in a rapidly changing environment of an underwater acoustic channel.

The invention discloses a lithium iron phosphate battery rest electric quantity estimation method based on a closed-loop hybrid algorithm. The estimation method is a rest electric quantity estimation hybrid algorithm based on two kinds of closed algorithms in an electric automobile battery platform period. According to open circuit voltage change features of a lithium iron phosphate battery, a work interval of the battery is divided into a platform period and a non-platform period; when a battery initial value is in the non-platform period, the particle filtering is used for performing rest electric quantity estimation; when the initial value is in the platform period, firstly, the boundless Kalman filtering is used for tracking to a position near a truth value; then, the particle filtering is used for estimation. In the platform period, the particle filtering and the boundless Kalman filtering are combined; firstly, the boundless Kalman filtering is used for tracking a rest electric quantity initial value to obtain a value similar to the rest electric quantity true value, and then, the particle filtering is used for rest electric quantity estimation; an accurate and high-robustness result is obtained as much as possible.

The invention relates to an ultra-narrow bandwidth dual-band filter based on an asymmetric step impedance resonator. The ultra-narrow bandwidth dual-band filter comprises a medium substrate, a micro-strip line on the upper surface of the medium substrate and a grounding metal coating on the lower surface of the medium substrate. The micro-strip line on the upper surface of the medium substrate consists of two identical asymmetric step impedance resonators A and B, an input feed line and an output feed line. The resonator A is folded with the resonator B into a spiral shape, the resonators A and B are mutually coupled with each other in a weak manner, and the input and output feed lines are respectively coupled with the resonators A and B to feed. The dual-band filter in the embodiment has a small size and good frequency selectivity, low insertion loss inside a pass-band and high attenuation outside the pass-band can be realized, and the ultra-narrow bandwidth dual-band filter can be used for the design of a ultra-narrow bandwidth miniaturized dual-band filter in a wireless communication system.