35 results about "Phase oscillation" patented technology

An oscillatory rate sensor is described for sensing rotation about the “z-axis”. It is tuning-fork in nature with structural linkages and dynamics such that fundamental anti-phase oscillation of two proof masses is accomplished by virtue of the mechanical linkages.

The invention relates to the field of magnetic resonance imaging technique, in particular to a magnetic resonance fast spin echo (FSE) imaging method, comprising the steps as follows: 1. phase coding gradient amplitude is reset, pre-scanning is carried out by FSE pulse sequence, the amplitude value of each etch signal peak on the echo chain is recorded; 2. the phase and inclination angle of convergence pulse is adjusted so as to lead the amplitude of each echo signal peak on the echo chain to achieve the maximum value, when the amplitude value Am and phase angle Phim of each echo signal peak are recorded; 3. the phase coding gradient is recovered, the scanning is carried out by the FSE pulse sequence, thus gaining the K space data; 4. according to the amplitude Am and Fai<m> of each echo signal peak gained in step 2, the K space data is corrected; 5. image reconstruction is carried out by the corrected K space data thus gaining the magnetic resonance images, etc. The magnetic resonance fast spin echo (FSE) imaging method solves the problems of echo amplitude phase oscillation and image blurring due to transverse relaxation of the prior art.

The invention provides a light low-frequency broadband sound insulation combined structure. The light low-frequency broadband sound insulation combined structure includes a thin film phononic crystal structure and a local resonance crystal structure which are arranged in parallel; the middle part of the light low-frequency broadband sound insulation combined structure is a cavity; when the first-layer thin film phononic crystal structure is stimulated by sound waves, a local resonance phenomenon occurs in weights and tensioned adhesive elastic films both, so that the average displacement of an entire cell is zero, and sound is effectively insulated; an anti-phase oscillation phenomenon occurs in weights and tensioned adhesive elastic films in adjacent cells, and therefore, efficient sound insulation can be realized at a lower-frequency position; and when the second-level local resonance crystal structure is stimulated by sound waves, efficient sound insulation can be realized at a designed sound insulation target frequency. The light low-frequency broadband sound insulation combined structure has the sound insulation advantages of the two kinds of structures. According to the light low-frequency broadband sound insulation combined structure, sound insulation broadband can be broadened at low frequencies, and the sound insulation amount of the light low-frequency broadband sound insulation combined structure is higher than that of a homogeneous plate having same surface density as the combined structure by more than 10dB.

The invention discloses a synthetic method of a magnetic resonance multi-channel image. The method includes the following steps: (1) obtaining multi-channel K space data; (2) comparing the maximum value of a module of K space data of each channel to obtain CHmin which is the number of a channel where the minimum maximum value is located; (3) conducting inverse Fourier transform on the K space data of each channel to obtain an original image of the channel; (4) enabling the image of each channel to an index phase of the image of the CHmin channel to obtain images with a phase portion only comprising coil sensitivity information; (5) conducting lowpass filtering processing on all images; (6) conducting principal component analysis on smoothened image data to obtain optimal matching filter vector; (7) conducting weighting and summation of the original image of each channel by using a matching filter to obtain a final synthetic image. The synthetic method can guarantee that the synthetic image is close to optimal signal-to-noise ratio, enables signal strength of the image to have unbiasedness, and can eliminate signal loss caused by phase oscillation.

A multiple-fiber, stretched, fused and cleaved coupler designed to act as an output window to a fiber laser array or fiber-coupled laser array, in which the stretch, length and / or position of the fibers is chosen facilitate the in-phase oscillation of the lasers in the array. The in-phase oscillation of the lasers is facilitated by making one or more of the fibers interferometrically dark and having a different propagation constant than the other fibers. The other fibers, the interferometrically lit ones, are made to have fairly uniform intensity under the same collimated illumination.

A multiple-fiber, stretched, fused and cleaved coupler designed to act as an output window to a fiber laser array or fiber-coupled laser array, in which the stretch, length and / or position of the fibers is chosen facilitate the in-phase oscillation of the lasers in the array. The in-phase oscillation of the lasers is facilitated by making one or more of the fibers interferometrically dark. The other fibers, the interferometrically lit ones, are made to have fairly uniform intensity under the same collimated illumination.

A quadrature voltage controlled oscillator includes oscillation circuits for generating in-phase and quadrature-phase oscillation signals that are used to generate in-phase and quadrature-phase output signals. A compensation circuit adjusts biasing in the oscillation circuits depending on a phase relationship between the in-phase and quadrature-phase output signals to automatically control the phase relationship between the oscillation signals.

A low noise oscillator constructed using a rotary traveling wave oscillator. The conductors of the rotary traveling wave oscillator provide at any tap position a pair of oppositely phased oscillations and these oscillations have slightly different phases at positions that are slightly different on the conductors. Regeneration devices establish and maintain oscillations on the conductors of the traveling wave oscillator. A regeneration device made from p-channel and n-channel transistors is connected to the conductors of the traveling wave oscillator in such a way that the gate connections of the transistors receive the traveling wavefront before the drains of the transistors receive the wavefront. By the time the regeneration device switches in response to the wavefront arriving at the gates of the transistors, the wavefront has arrived at the drains. This creates little or no disturbance to the wave on the conductors and results in low phase noise.

A second-harmonic oscillator based on push-push oscillation has a pair of amplifiers for oscillation, a high frequency transmission line for connecting inputs of the pair of amplifiers to each other and connecting outputs of the pair of amplifiers to each other, and an electromagnetic coupling member disposed between the inputs and outputs of the pair of amplifiers such that it is electromagnetically coupled to the high frequency transmission line. The electromagnetic coupling member includes at least a dielectric resonator. The pair of amplifiers, high frequency transmission line, and electromagnetic coupling member form two oscillation loops which oscillate in opposite phases to each other with respect to a fundamental wave of oscillation for generating a second harmonic of the fundamental wave.

The proposed method is intended for rhythmic stimulation of neurotrophic reflexes to simultaneous stretching of muscles in various sections of spine, joints of limbs and in the main muscles of a human body. The aforesaid method can be implemented by employing an exercise machine that provides for mechanical anti-phase oscillations of lodgments affecting various sections of the body and limbs without considerable movements of the neck-and-head lodgment in the vertical direction. The upper body and the lower limbs make in-phase reciprocal movements, while the pelvic area makes movements anti-phase relative thereto. A support for the neck-and-head part is installed to allow supporting natural movements of the head in the course of the aforesaid movements of the upper body. The design of the exercise machine is described in detail herein.

The invention relates to an energy-dissipating and shock-absorbing support for ultra-high voltage substation equipment with adjustable stiffness and its application. The support is a lattice support, including a support column, a transverse rod and a diagonal rod, and the diagonal rod is a rod with adjustable stiffness. Components; the coupled UHV equipment is placed on the top of the support, and the stiffness of the diagonal rods of the support is adjusted to keep the coupled UHV equipment vibrating in the same phase during the earthquake. Compared with the prior art, the present invention does not change the overall arrangement of the substation equipment, does not increase the displacement of the top of the equipment, and does not adversely affect the electrical performance of the equipment. Energy-dissipating and shock-absorbing devices are installed on the poles, so that different types of equipment on each support can maintain the same phase vibration during the earthquake, and the seismic response is also greatly reduced.

The invention provides an exercise seat and a control method thereof. The exercise seat comprises a seat surface, at least two phase oscillation circuits are arranged at the periphery of the seat surface, and the at least two phase oscillation circuits comprise an inverse-phase amplifier and an oscillator which are electrically connected respectively; the inverse-phase amplifier of the at least two phase oscillation circuits is used for outputting an oscillation signal of a corresponding oscillation phase to the oscillator which is electrically connected with the inverse-phase amplifier according to an oscillation signal and an oscillation phase enable signal; the oscillator of the at least two phase oscillation circuits is used for conducting oscillation according to the oscillation signal output by the inverse-phase amplifier which is electrically connected with the oscillator to drive the exercise seat to pitch back and forth and / or roll left and right. The oscillation signal and the oscillation phase enable signal are generated according to a motion signal in a VR scene. The exercise seat can strengthen the motion feeling, lower the cost and improve the reliability.

The invention discloses an imprisoned radio frequency source for a mercury ion microwave frequency marker, in order to solve the problems of low frequency and poor stability of the existing imprisoned radio frequency source for the mercury ion microwave frequency marker. The imprisoned radio frequency source comprises an oscillator, a phase shift splitting module, a first power amplifier module, a second power amplifier module, a booster, a first adjustable capacitor, a second adjustable capacitor and an ion trap; the oscillator is used for producing an oscillating signal; the phase shift splitting module is used for dividing the oscillating signal into two paths of positive phase oscillation and negative phase oscillation with opposite phases and identical frequency; the first power amplifier module amplifies the positive phase oscillation to generate a positive phase oscillation amplification signal; the second power amplifier module amplifies the negative phase oscillation to generate a negative phase oscillation amplification signal; and the booster is connected with the output of the first power amplifier module and the second power amplifier module to boost to generate a positive phase oscillation boosting signal and a negative phase oscillation boosting signal and separately input the positive phase oscillation boosting signal and the negative phase oscillation boosting signal in two electrodes of the ion trap. The scheme provided by the invention has the advantages of high frequency stability, stable output voltage amplitude, integration and miniaturization.

A quadrature voltage controlled oscillator includes oscillation circuits for generating in-phase and quadrature-phase oscillation signals that are used to generate in-phase and quadrature-phase output signals. A compensation circuit adjusts biasing in the oscillation circuits depending on a phase relationship between the in-phase and quadrature-phase output signals to automatically control the phase relationship between the oscillation signals.

The invention discloses a method for realizing M / N duty ratio clock signals with chemical reaction networks. The method includes the steps that by means of a circle diagram, 4N chemical reaction networks are provided for realizing an N-phase oscillator, N 1 / N duty ratio phase clock signals are generated, all three kinds of chemical reactions needed by the CRNs are mapped one by one through four kinds of different directed arrows, and the target CRNs can be obtained conveniently and efficiently; support is draw from a circle diagram again, twelve chemical reaction equations are used for building a two-phase oscillation mechanism, and ideal 1 / 2 duty ratio clock signals are generated; the two previous technologies are combined, similar gears of the two circle diagrams are coupled, according to manifestation of the coupling effect on chemical reaction equations, only four chemical reaction equations need to be adjusted slightly, and the target M / N duty ratio clock signals are generated successfully. The method has initiative and pervasive generality, and is popular and easy to understand and capable of being popularized to the design of realizing any rational number M / N duty ratio clock signals with the chemical reaction networks.

A planar harmonic high frequency oscillator comprises a pair of amplifiers for oscillation, a micro-strip line for connecting between inputs of the pair of amplifiers and between outputs of the amplifiers, a slot line disposed between the inputs and the outputs of the pair of the amplifiers for electromagnetically coupling with the micro-strip line, an output line connected to the micro-strip line at a position at which the micro-strip line traverses the slot line between the inputs or outputs of the pair of amplifiers, and an electronic device for connecting conductors on both sides of the slot line, and for controlling an electromagnetic wave field of the slot line in response to a control signal applied thereto. Two oscillation systems which oscillate in opposite phases with respect to the fundamental wave of oscillation are formed to generate an even-order harmonic of the fundamental wave.

A control device for machine tools according to an aspect of the present disclosure controls a machine tool which cuts the workpiece by way of the cutting tool by causing the spindle and the feed axis to cooperatively act, the control device including: a feed command calculation unit which calculates a feed command for causing the feed axis to relatively move in relation to the workpiece; an oscillation phase calculation unit which calculates an oscillation phase that is a phase of oscillation to cause the feed axis to reciprocally move based on a rotation number of the spindle; an oscillation phase compensation unit which compensates the oscillation phase; an oscillation amplitude calculation unit which calculates an oscillation amplitude that is an amplitude of oscillation causing the feed axis to reciprocally move based on the feed command; an oscillation command calculation unit which calculates an oscillation command causing the feed axis to reciprocally move, based on the oscillation amplitude and the oscillation phase after compensation by the oscillation phase compensation unit; and a command synthesizing unit which calculates a synthetic command for driving the feed axis by superimposing the feed command and the oscillation command.

The invention relates to the technical field of sine wave oscillator output voltage auxiliary circuits, and particularly discloses an RC sine wave oscillator output voltage regulation and control circuit which comprises a sampling circuit, a regulation and control circuit and a two-phase oscillation circuit, the sampling circuit is connected with the regulation and control circuit, and the regulation and control circuit is connected with the two-phase oscillation circuit. The regulating circuit is used in cooperation with a sine wave oscillator composed of an R operational amplifier, a C operational amplifier and the like, so that voltage generated by oscillation can be controlled by an external direct-current voltage, and the voltage can be continuously and accurately regulated and controlled between 0 and the maximum value. Therefore, the functions of voltage stabilization, voltage regulation, current stabilization, power stabilization and the like can be conveniently realized by matching with the amplifier. And the control of a computer can be conveniently accepted, a plurality of regulation and control functions are realized, and a plurality of application requirements are met.

The invention discloses a PMU (Phasor Measurement Unit) dynamic data processing method based on feedback iterative frequency tracking. The method comprises the following steps: 1) a frequency value of a measurement system is obtained through a difference of a phase angle of a current cyclic wave phasor and the phase angle of a previous cyclic wave phasor, and the frequency value serves as the input frequency of a frequency tracking processing link after time delay correspondence is carried out, so that the tracking compensation correction of a system can be regulated immediately along with the change of the real-time frequency of the system so as to show high measurement precision in a dynamic environment which is changed along with time; and 2) on the basis of a DFT (Discrete Fourier Transform) equalization effect, a time scale of a measurement phasor is required to select the window center of a processing data window, so that a Lagrange interpolation and digital filter of frequency tracking is required as follow: the time scale point is taken as the center, and the processing data point numbers of two sides of the time scale point are completely equal. The method is still high in measurement precision when a power system is under dynamic conditions including frequency drift, amplitude oscillation, phase position oscillation and the like. The reliability of the data measurement and the state control of the system under an unstable state can be improved so as to be favorable for the digitized high-precision measurement and control of a power grid system to be safe and effective.

The invention discloses a method for determining an elevator speed control coefficient, which can obtain a better value of a control coefficient in a PI (Proportional-Integral) controller according to a frequency response gain and a phase oscillation condition of a closed loop control model of an elevator system and a boundary condition set by an engineer.

The invention relates to a bunch-by-bunch three-dimensional position measurement system which comprises a plurality of button type beam position probes, each beam position probe is connected with a split-phase sampling circuit through a coaxial cable, the split-phase sampling circuit is electrically connected with a data acquisition system, and the data acquisition system is electrically connected with a timing system. According to the bunch-by-bunch three-dimensional position measurement system, the measurement time is saved, and the data consistency is ensured. The invention further relates to a bunch-by-bunch three-dimensional position measurement method, the split-phase sampling technology is adopted, signal amplitude and phase information are obtained by establishing a lookup table for mode matching, measurement errors caused by linear fitting are avoided, influences caused by clock jitter and phase oscillation are effectively removed, and the precision of extracting the three-dimensional position information of the bunch-by-bunch group is improved.

The invention discloses a synthetic method of a magnetic resonance multi-channel image. The method includes the following steps: (1) obtaining multi-channel K space data; (2) comparing the maximum value of a module of K space data of each channel to obtain CHmin which is the number of a channel where the minimum maximum value is located; (3) conducting inverse Fourier transform on the K space data of each channel to obtain an original image of the channel; (4) enabling the image of each channel to an index phase of the image of the CHmin channel to obtain images with a phase portion only comprising coil sensitivity information; (5) conducting lowpass filtering processing on all images; (6) conducting principal component analysis on smoothened image data to obtain optimal matching filter vector; (7) conducting weighting and summation of the original image of each channel by using a matching filter to obtain a final synthetic image. The synthetic method can guarantee that the synthetic image is close to optimal signal-to-noise ratio, enables signal strength of the image to have unbiasedness, and can eliminate signal loss caused by phase oscillation.