33results about How to "Flexible tuning" patented technology

The invention provides a rolling bearing remaining life prediction method based on a long-short term memory network. The rolling bearing remaining life prediction method comprises the steps that characteristics of abrasion signals of the rolling bearing is extracted; principle component analysis is conducted on the extracted characteristics to obtain fusion characteristics; normalization processing is conducted on the fusion characteristics; cyclic overlapped interception is conducted on fusion characteristic data in a set step-size to obtain short sequences; the short sequences are divided into a training set and a prediction set; an LSTM deep learning network is constructed; the LSTM deep learning network is trained through the training set; the LSTM deep learning network is verified through the prediction set; and training results and prediction results are subjected to inverse normalization processing and output. According to the rolling bearing remaining life prediction method based on the long-short term memory network, an LSTM prediction model is provided based on the field of deep learning and has high applicability and accuracy in fault time sequence analysis, and the problem of long-term dependence in time sequence is solved.

The invention relates to a KVM video coding quantization parameter range control method comprising the following steps: inputting a frame of KVM video image and the target bit rate and target frame rate of video coding; setting the coding quantization parameter mode QpMode of the current frame; calculating the coding quantization parameter range of the current frame according to the coding quantization parameter mode of the current frame; performing H.264 and H.265 coding on the current frame of video image according to the coding quantization parameter range, and getting the number of frame bits of the current frame; and repeating the steps to code a next frame of video image. The system delay is ensured in a basically static scene. The video stream of a KVM scene is clearer at image details. Smooth stream output is ensured during scene switching. The quality convergence of video images is accelerated. A typical value range of each parameter is given so users can perform adjustment and optimization flexibly according to such factors as coder type, video resolution and system delay.

The invention provides a matching adjustable broadband rectification antenna based on a resonance structure. The antenna comprises a receiving antenna and a rectification circuit based on adjustable branches of the resonance structure, the rectification circuit sequentially comprises a pre-capacitor, a rectification topological structure, a matching circuit, an output filter and a load in the energy flowing direction. The resonance structure and a matching branch knot are connected in series and then inserted between the front capacitor and the rectification topological structure. The impedance of the matching branch knot is adjusted through the impedance change of the resonance structure under different frequencies, so that the impedance of the rectification circuit under each frequency in the whole broadband is adjusted; and the impedance comprises a real part and an imaginary part of the impedance of the rectification circuit. According to the invention, an inductance-capacitance series-parallel resonance structure is adopted; the on or off state of the adjustable switching device and the impedance adjustable characteristic of the variable capacitance adjustable diode are simulated along with the change of the frequency, and the matching branch knot is converted into an adjustable matching branch knot, so that the impedance of the rectifying circuit is changed along with thechange of the frequency, and good impedance conjugate matching with the receiving antenna is adaptively realized.

The invention discloses a tunable microwave pulse signal precise generation method and a tunable microwave pulse signal precise generation device by adopting polarization quadrature modulation. After a single-wavelength continuous light source is processed by a polarization quadrature dual-wavelength light source generation module, two light wavelengths with polarization states in quadrature and certain wavelength difference are output. The two wavelength components with the polarization states in quadrature respectively and simultaneously complete phase modulation for phase reversal on two quadrature polarization axes of a polarization modulator; then different frequency modulation areas of light signals at the two modulated light wavelengths are selected by using an intensity-modulated periodic time domain switch; finally, constant carrier frequency/chirped microwave pulse signals with designated pulse rate, pulse width and center carrier frequency are generated through frequency beating of a photoelectric detector. The tunable microwave pulse signal precise generation method and the tunable microwave pulse signal precise generation device by adopting polarization quadrature modulation have the advantages that on the premise that the generated microwave pulse signals are ensured to have high-frequency advantages and a large time-bandwidth product, the high-precision control and the flexible tuning of the pulse rate, the pulse width and the center carrier frequency of the generated pulse signals are further realized, the optional output of constant carry frequency/frequency chirped microwave pulse signals is also realized and the application scope is very wide.

The invention discloses a micro-electro-mechanical system (MEMS)-based multi-channel tunable fiber laser and a control method for the same. The awkward scheme that a plurality of independent lasers are simply combined in a common multi-channel fiber laser structure is abandoned, and an integrated optical module is ingeniously shared by a plurality of fiber optical modules, so that the aim of simultaneously and independently tuning a plurality of paths of laser output by utilizing an MEMS processor is fulfilled, and the development of the multi-channel tunable fiber laser towards integration, miniaturization, high accuracy and multifunction are facilitated. A plurality of wavelength channels of laser can be simultaneously output, and the wavelength of the laser in each channel is continuously tunable within the waveband of an optical fiber amplifier, and the connection and disconnection of each channel are independently controlled; and the output wavelength and output power of each channel can be simultaneously and independently tuned locally or remotely through software. The whole experiment has low requirements on the environment, and is easy to operate and productize.

The invention discloses a broadband continuous tuning optical carrier microwave filtering device, which comprises spectral hole-burning crystal, a low-temperature thermostat, an electrooptical modulator, a carrier wave laser, an optical fiber collimator, a frequency accurate-tuning laser, an arbitrary signal generator, a converging lens and an extender lens, wherein the frequency accurate-tuning laser emits a hole-burning preset laser light to irradiate the crystal; ions with a corresponding frequency are excited to an upper energy level; within the lifetime of the upper energy level, a spectral burnt hole with a corresponding laser light frequency is left in the crystal; a microwave signal is loaded to a carrier wave laser light through the electrooptical modulator; and when to-be-filtered optical carrier microwave signals irradiate the same position of the crystal, the optical carrier microwave signal with the corresponding spectral hole-burning frequency passes through the crystal and the signals with other frequencies are absorbed by the crystal, so that reconfigurable and tunable optical carrier microwave signal filtering is achieved. The broadband continuous tuning optical carrier microwave filtering device has the characteristics of being flexible, tunable, reconfigurable and the like within a broad frequency range on the basis of transient spectral hole burning; and the single-passband frequency response is easy to achieve.

The invention discloses an optical wavelength interlacing filter with the bandwidth allocation characteristics adjustable and belongs to the field of optical fiber communication. The optical wavelength interlacing filter with the bandwidth allocation characteristics adjustable overcomes the defects that the bandwidth of channels with the serial number being odd numbers and even numbers is not adjustable, loss is large and cost is high. According to the interlacing filter, the first port of a 1*2 optical coupler (20) is connected with an input wavelength division multiplexing signal (10), the second port of the 1*2 optical coupler (20) is connected with the first port of a first 2*2 optical coupler (1), and the third port of the 1*2 optical coupler (20) is connected with the first port of a second 2*2 optical coupler (2) through an optical phase modulator (6); the second port and the third port of the first 2*2 optical coupler are connected with the second port and the third port of a third 2*2 optical coupler (3) through a first doped optical fiber (11) and a second doped optical fiber (12) respectively, and the fourth port of the first 2*2 optical coupler is connected with the second port of the second 2*2 optical coupler; the third port and the fourth port of the second 2*2 optical coupler are connected with an odd-number output channel (7) and an even-number output channel (8) respectively; the first port and the fourth port of the third 2*2 optical coupler are connected with a first pump light source (91) and a second pump light source (92) respectively.

The invention discloses a reconfigurable integrated microwave photon band-pass filter, and belongs to the field of microwave photon signal processing. The reconfigurable integrated microwave photon band-pass filter comprises a semiconductor laser for outputting a continuous optical carrier signal; an optical beam splitter is used for splitting the continuous optical carrier signal into two paths of light beams; a microwave optical signal generation module is used for generating a microwave modulation signal and modulating the microwave modulation signal and one path of light beam output by the optical beam splitter to generate a microwave optical signal; a multi-stage cascaded second-order micro-ring filter is integrated, and bandwidth reconstruction and rejection ratio and center frequency tuning are carried out on the generated microwave optical signal; an optical coupler is used for combining the microwave optical signal with the other path of light beam output by the optical beam splitter; a microwave electric signal receiving module is used for converting the combined microwave optical signal into an electric signal and receiving the microwave electric signal. According to the invention, narrow-band filtering can be realized on the basis of a high radio frequency out-of-band rejection ratio, and bandwidth reconstruction of a microwave optical signal in a wide range and flexible tuning of a center frequency are realized.

A rotary table with a main frame, at least two driving wheels, at least two driven wheels, a round inner seal plate and a round outer seal plate. The main frame is provided with an inner and outer annular track region. Driving-wheel emplacement regions are at proper locations on the outer annular track region and driven-wheels are installed in a drive-wheel annular track region between the inner and outer annular track regions. The driving wheels are installed in the driving-wheel emplacement regions of the main frame. A side of the drive-wheel is connected with a sliding block. The driven wheel is matched and gnawed with the driving wheel which can drive individually the matched and gnawed driven wheel to rotate and displace to perform plural manufacturing processes of a short machine-hour and plural fixed sites, such that all the manufacturing processes can be accomplished simultaneously.

The invention provides a distributed Bragg reflection laser-based chirp microwave generating device, which comprises an arbitrary waveform generator used for providing an electric signal which is changed along with the time; a distributed Bragg reflection laser electrically connected with the arbitrary waveform generator and used for generating a chirp laser according to the electric signal which is changed along with the time; a tunable single-mode laser used for generating a tunable single-mode laser; a coupler connected with the distributed Brag reflection laser and the tunable single-mode laser and used for coupling the chirp laser generated by the distributed Bragg reflection laser to the tunable single-mode laser generated by the tunable single-mode laser; and a photoelectric detector used for receiving the coupled laser and then generating a chirp microwave. The chirp microwave generating device can generate chirp microwaves adjustable in shape, period and bandwidth, and super-high in time-bandwidth product and compression ratio.

The invention discloses a microwave photon imaging and identification integrated radar system based on a semiconductor laser, and the system comprises an injection light module, a slave laser, a first photoelectric detector, a power divider, a transmitting and receiving module, a microwave photon frequency mixing module, a target identification input module, a storage pool calculation system, and a target identification output module. A reserve computing system includes a driver module and a response module. Based on the semiconductor laser, the training cost of the system is reduced by utilizing the incomparable advantages of the high-speed propagation characteristic of laser in the calculation rate; based on the photon technology, not only is high-resolution radar imaging realized, but also integration of radar imaging and recognition is realized, the training time and cost are greatly reduced, and meanwhile, the method has the advantages of simple construction, high processing speed and high accuracy. Wherein the slave laser works in a single-period oscillation state, so that the generated radar emission signal has the advantages of large sweep bandwidth, high imaging resolution and flexible tuning.

The invention provides a tunable active filter which comprises a light polarization input control unit, a magnetic filter body and a magnetic field loading unit, wherein the light polarization input control unit is used for converting input light into TM-mode polarized light which incomes in the K direction, the magnetic filter body is arranged at the rear end of an optical path of the light polarization input control unit and prepared through magnetic materials and dielectric substances, the magnetic filter body is of a periodic Bragg structure which has defects, extends in the K direction and is used for filtering the polarized light which incomes from the light polarized input control unit by means of a transmission peak generated by the defects of the periodic Bragg structure, and the magnetic loading unit is used for generating a magnetic field which is perpendicular to the K direction and the incident polarized light electric field direction and modulating the position of the transmission peak generated by the defects of the Bragg structure. The tunable active filter is easy to manufacture, quick in response, flexible in tuning process and high in tuning precision.

The invention discloses a millimeter wave generator based on a cascaded space-time symmetric optical fiber F-P resonant cavity. The generator comprises a dual-wavelength laser based on the cascaded space-time symmetric optical fiber F-P resonant cavity, an erbium-doped optical fiber amplifier and a photoelectric detector. The dual-wavelength laser comprises a 980nm pump light source, a wavelength division multiplexing coupler, a Bragg grating, a quartz capillary tube, a soft micro-flow conduit and a common single-mode fiber, wherein the end face of the Bragg grating is spin-coated with an erbium-doped ion sol-gel thin film and an erbium-free ion sol-gel thin film. A gain and loss thin film is used for constructing an F-P resonant cavity structure in space-time symmetry, dual-wavelength laser output can be obtained near a singular point, output laser is amplified by an erbium-doped optical fiber amplifier and then input into a photoelectric detector for frequency mixing, millimeter wave output can be obtained, and the millimeter wave output frequency can be tuned by filling a functional material and adjusting the refractive index of the functional material. The millimeter wave generator has the advantages of wide output frequency range, continuous frequency tuning, easiness in integration, high compatibility with an optical fiber system and the like.

The invention discloses an electric vehicle speed reducer remaining service life prediction method based on LSTM. The method comprises the steps of: preprocessing full-life-cycle vibration data of an electric vehicle speed reducer; constructing degradation characteristics of reducer vibration signals on a time domain, a frequency domain and a time-frequency domain, thereby constructing a degradation characteristic data set of each electric vehicle reducer, and constructing a residual life prediction model by using an LSTM neural network; normalizing the degradation characteristic data set input into the prediction model; carrying out segmentation processing on the normalized data; dividing the degradation characteristic data set into a training set and a test set, and taking training data as the input of the whole prediction network model; and performing network parameter adjustment by using a single variable method, and outputting an optimal life prediction result. The prediction method which is more reliable and higher in generalization is provided for analysis of the remaining service life of the speed reducer of the electric vehicle.

The invention provides a graphene and nano antenna array-based tunable directional coupler, which comprises a nano antenna array, a first graphene layer and a waveguide, wherein the nano antenna arrayis arranged on the upper surface of the first graphene layer; the first graphene layer is arranged above the waveguide; the nano antenna array is used for highly and directionally coupling an opticalsignal component meeting a preset polarization direction in free space and in a tunable directional coupler working band to a specific mode in the waveguide; and the first graphene layer is used forchanging the working wavelength of the tunable directional coupler under effects of external voltage. According to the graphene and nano antenna array-based tunable directional coupler provided in theinvention, as the first graphene layer is used for changing the working wavelength of the tunable directional coupler under effects of external voltage, high-speed and real-time tuning on the workingwavelength of the tunable directional coupler can be realized.