13 results about "Wave oscillation" patented technology

The invention relates to a seabed elastic parameter inversion method, system and device under an earthquake spherical reflection wave oscillation-gradual change nuclear decoupling framework, and belongs to the field of geophysical detection and acoustic detection. The method comprises the following steps: (1) inputting observation data and initializing seabed elastic parameters; (2) determining an integral interval and decomposing the integral interval into a plurality of sub-intervals; (3) calculating an oscillation nuclear local integral matrix corresponding to the incident angle of the observation data; (4) calculating a slowly-varying kernel local mean vector; (5) calculating a spherical wave reflection coefficient of oscillation-gradual change kernel decoupling; and (6) constructing a target function by using the decoupled spherical wave reflection coefficient, and solving the target function. In the objective function solving process, only the steps (4) and (5) need to be repeatedly executed after the seabed elastic parameters are updated, the oscillation nuclear local integral matrix in the step (3) does not need to be repeatedly calculated, redundant calculation about oscillation nuclear integration is avoided, and the calculation efficiency is improved.

The invention discloses a high-speed maglev train suspension constraint control method for coping with long-wave oscillation of a track beam, and belongs to the field of maglev track traffic. The method comprises the following steps: dynamically expanding high-speed maglev train model prediction suspension control under asymmetric preset performance constraints, and coping with safety constraint control of accurate suspension of the high-speed maglev train with long-wave oscillation of a track beam: establishing a track model of the long-wave oscillation of the track beam; designing the precise suspension dynamic expansion asymmetric preset performance constraint of the high-speed maglev train according to the long-wave oscillation information of the track beam; designing a high-speed maglev train suspension air gap mathematical model containing track beam long-wave oscillation information; obtaining a state space expression based on a reconstruction error according to the dynamic expansion asymmetric preset performance constraint and the conversion error; a prediction model is obtained through the expression, an optimal control problem is designed, and an optimal solution is solved; on the premise that the track beam oscillation reference air gap tracking precision is improved, suspension deadlock of the high-speed maglev train under long-wave oscillation of the track beam is avoided, and it is ensured that the high-speed maglev train runs safely in a small suspension gap with low power consumption under long-wave oscillation of the track beam.

A method for improving cerebrospinal fluid clearance through a glymphatic system, while a patient is sleeping, resting, or a combination thereof, the method comprising measuring ultrasound data with one or more ultrasound emitters and extracting B-wave oscillations from the ultrasound data.

The invention relates to a W-band low-noise voltage-controlled oscillator based on a transformer resonant cavity and harmonic extraction. The W-band low-noise voltage-controlled oscillator comprises a dual-core in-phase coupled oscillator core, a two-bit switched capacitor bank, a linear variable capacitor bank and an output buffer, the dual-core in-phase coupled oscillator core comprises a transformer resonant cavity and a harmonic extraction network, a fundamental wave oscillation signal is generated in the transformer resonant cavity and is coupled and output to the output buffer, and a high-power second harmonic oscillation signal is generated in the harmonic extraction network and is output as a target oscillation signal; the two-bit switched capacitor bank adopts an HBT switch with excellent high-frequency performance, the tuning range of the oscillator is divided into four sub-bands, and the tuning gain is reduced; the capacitance value of the linearized variable capacitor bank is linearly changed along with the tuning voltage height, and a conversion mechanism of flicker noise is inhibited; and the output buffer realizes load isolation and buffering of the fundamental wave oscillation signal. The voltage-controlled oscillator has low tuning gain and high output power in the W wave band, and excellent phase noise is achieved.

This invention discloses a slow-wave structure and circuit suitable for high-order modes, including a housing, an upper gate extending from the top wall to the bottom wall of the housing, and a lower gate extending from the bottom wall to the top wall of the housing. Multiple upper and lower gates are staggered, defining multiple periodic vacuum cavities. The upper and lower gates have different heights along the height direction of the slow-wave structure. An electron beam channel is formed between the upper and lower gates. This invention can suppress low-order mode competition and back-wave oscillations at low operating voltages, achieving stable operation in high-order modes and achieving high output power of 100W or more with low voltage.

The present application relates to a kind of seabed elastic parameter inversion method, system and device under the oscillation-slowly varying nuclear decoupling framework of seismic spherical reflection wave, belong to geophysical prospecting, acoustic detection field.The method includes the following steps: (1) input observation data and initialize seabed elastic parameter;(2) determine integration interval and decompose integration interval into several sub-intervals;(3) calculate the local integral matrix of oscillation kernel corresponding to the incidence angle of observation data;(4) calculate the local mean vector of slowly varying kernel;(5) calculate the spherical wave reflection coefficient of oscillation-slowly varying nuclear decoupling;(6) decoupled spherical wave reflection coefficient is used to construct objective function and solve.In the process of solving objective function, only need to repeat "step (4) (5)" after updating seabed elastic parameter, without repeating the calculation of oscillation kernel local integral matrix in step (3), avoid the redundant calculation about oscillation kernel integration, improve the calculation efficiency.

The invention belongs to the technical field of sleep regulation and control, and aims to provide a sleep regulation and control method and system based on closed-loop sound stimulation. Through phase tracking and phase compensation, the slow wave rising state can be accurately locked, millisecond-level synchronization of sound stimulation and brain slow wave oscillation can be achieved, compared with a traditional scheme only based on amplitude triggering, the physiological matching performance of sound stimulation can be remarkably improved, and the problem that stimulation and endogenous rhythm are not synchronous is fundamentally solved. According to the invention, slow wave phase locking can be realized, sound stimulation can be applied to a user at an optimal phase point, delay compensation capability is provided, and accurate control of sleep regulation can be realized.

The utility model relates to an automatic adjustment power ultrasonic system, including power supply module, co-frequency drive circuit, ultrasonic oscillation circuit and sampling circuit, power supply module includes chip U8, chip U24, diode D6, diode D25 and inductor L8, co-frequency drive circuit includes chip U19, MOS transistor VT37, resistor R106, resistor R110 and resistor R119. The ultrasonic oscillation circuit comprises a triode VT32, a diode D36, a capacitor C125 and a capacitor C133. According to the utility model, the power can be automatically adjusted to a set value range, no special requirement on the transducer exists, the loss of a finished product can be greatly reduced, and meanwhile, the corresponding power adjustment is carried out along with the environment and the heating temperature of the transducer, so that the safety problem caused by overheating is prevented. And the abnormal power of the transducer can be automatically detected, so that the MCU can respond in time. The power output precision can be improved, the loss of finished products is reduced, the quality is improved, and the product safety is improved.

The application discloses a wave impact intelligent locking protection method and system based on artificial intelligence and belongs to the technical field of wave energy. Wave oscillation waveform data is collected, a wave peak time node is identified and time periods are divided, a vibration body reciprocating vibration state is monitored and a waveform is fitted; a negative vibration characteristic waveform is extracted, an observation sampling frequency of a pressure monitoring sensor is quantified; a load pressure value and a time node at a negative half-wave form trough are captured, a double-scale wave window model is constructed to quantize high-frequency energy degree; a load sampling frequency is calculated based on the high-frequency energy degree, the sampling frequency is calibrated through an intelligent locking protection model and is fed back to the sensor. The application combines time domain and energy domain characteristics of a vibration frequency, effectively solves the problems of rigid sampling strategy, one-sided feature analysis and missing calibration mechanism in the prior art, and improves the adaptability and efficiency of intelligent locking protection under a wave impact environment.

The present invention provides a structure that improves radiation efficiency of terahertz waves. The present invention comprises: an AC generation source; a first electrode and a second electrode that are stacked so as to have the AC generation source interposed therebetween to apply voltage and current to the AC generation source, the second electrode having a smaller area than the first electrode; and a constricted portion that is electrically connected to at least one of the first electrode and the second electrode, the constricted portion being more constricted than the at least one of the first electrode and the second electrode to which the constricted portion is connected.

This invention provides a method for oscillation simulation testing, implemented using a wave compensation test bench. The wave compensation test bench includes a first oscillation device, a second oscillation device, and a lifting device. The lifting device is mounted on the second oscillation device, and the second oscillation device is mounted on the first oscillation device. The first oscillation device drives the lifting device to oscillate along a first oscillation direction, and the second oscillation device drives the lifting device to oscillate along a second oscillation direction. The lifting device moves up and down along a third movement direction. The first oscillation direction, the second oscillation direction, and the third movement direction are perpendicularly arranged. The oscillation in the first oscillation direction, the second oscillation direction, and the third movement direction enable the lifting device to move in three different directions, while the first oscillation direction, the second oscillation direction, and the third movement direction are perpendicularly arranged. Therefore, the lifting device can move along the X-axis, the Y-axis, and the Z-axis, thereby simulating wave oscillation.

[Task] Providing a robot and robot control method by which vibrations of a shaft can be suppressed. [Solution] A robot comprises a robot arm, a shaft supported on the robot arm and moving linearly along a central axis relative to the robot arm, a hand attached to the front end section of the shaft, a first inertial sensor located on the robot arm and measuring inertia in a direction perpendicular to the central axis, a second inertial sensor located on the hand or shaft and measuring inertia in a direction perpendicular to the central axis, drive components for driving the robot arm, and a control component for controlling the drive components, wherein the control component, based on an output from the first inertial sensor, subjects the drive component to feedback control and, based on an output from the second inertial sensor, determines whether vibrations of the shaft are in a normal or abnormal state.where the conditions for feedback control in the case of the abnormal state are distinguished from those in the case of the normal state.

The application discloses a pipeline descaling device and method based on an electromagnetic wave method of irregular modulation frequency, and the method comprises the following steps: generating a cyclically changed basic frequency F0; using a microprocessor ADC to sample a suspended pin to generate a random number and calculate a random variable frequency Delta F; superimposing F0 and Delta F to generate an irregular modulation frequency F; and generating a high-frequency pulse modulation electromagnetic wave according to F to control an electromagnetic wave oscillation circuit, and radiating the electromagnetic wave to water through a pipeline to perform descaling. The device comprises a microprocessor module, an electromagnetic wave oscillation circuit, an indicator lamp and a power module. The electromagnetic wave oscillation circuit is composed of a triode, a capacitor and a magnetic bar to form an RLC oscillation circuit, and one end of a magnetic bar secondary coil is connected to a descaled metal pipeline. The application prevents water ions from producing adaptability through the irregular modulation frequency, improves the long-term stability of the descaling effect, and has the advantages of simple structure, low cost and good descaling effect.