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. 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.

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.

The invention provides a method and system for suppressing ultra-low frequency oscillation of an asynchronous sending-end power grid by using a flexible DC power transmission system. The method comprises the following steps: distinguishing a sending-end converter station and a receiving-end converter station in two alternating current stations, collecting a bus frequency signal of the sending-endconverter station, and further extracting an ultra-low frequency oscillation frequency signal from the bus frequency signal of the sending-end converter station; and serving the ultra-low frequency oscillation frequency signal as a power control instruction to synchronize power amplitude sent to the receiving-end converter station with phase oscillation variation of the ultra-low frequency oscillation signal so as to realize ultra-low frequency oscillation control of the sending-end converter station. By utilizing the characteristic that power of the DC external transmission is rapidly adjustable, DC power external transmission is increased in the frequency signal rising phase, and DC power external transmission is reduced in the frequency signal reducing phase, so that the problem of ultra-low frequency oscillation can be effectively suppressed.

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 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.