61 results about "Natural mode" patented technology

An orthogonal electrical coupling relies on electromagnetic coupling for the inner connection, as opposed to direct contact between conductors. A conductor on one of the lines is connected to a ground plane which is adjacent to a resonant slot. Microwave energy is coupled to the slot, thereby exciting the slot. A second conductor is on the opposite side of the ground plane from the first conductor. Microwave energy from the excited resonant slot passes to the second conductor, thereby allowing contactless interconnection between the first conductor and the second conductor. The coupling may emphasize certain modes of propagation relative to other possible modes of propagation. Specifically, the ground plane and slot may be enclosed in a cavity of a size such that the cavity does not support any natural mode propagation inside the cavity. Instead, the coupling may have a cavity in which a transverse electromagnetic (TEM) mode is propagated.

The invention provides a non-contact control method for controlling a five-finger bionic manipulator through learning hand motion gestures and belongs to the field of intelligent control. According to the method, a three-dimensional hand modeling method with adaptivity is proposed, motion gestures of all joint points of a hand of a control worker are tracked according to a three-dimensional hand model, and a corresponding relationship between the motion gestures of the hand and action commands of the manipulator is established with a mapping algorithm, so that the control worker controls the five-finger manipulator in a natural mode. Under the condition of utilization of RGB-D images, the three-dimensional hand model is established to describe pose parameters of the joints of the hand, an improved APSO (adaptive particle swarm optimization) algorithm is proposed to solve the pose parameters, the rate of convergence of solution of high-dimensional parameters is effectively increased, limitation of wearable devices such as data gloves and the like is avoided, and the defects that a conventional control method based on a sensor can only acquires poses of part of joints of the hand and cannot be applicable to a bionic multi-fingered hand with high degree of freedom are overcome.

The invention discloses a determination method and system for the unbalance mass of a cylindrical shell gyroscope harmonic oscillator. The method comprises the following steps: A, applying a driving signal to an electromagnet to excite the natural mode of vibration of oscillator, wherein the frequency of the driving signal is equal to the inherent frequency of the oscillator; B, measuring a vibrating signal of an oscillator supporting rod by means of an piezoelectric electrode to obtain an output amplitude of the piezoelectric electrode; and C, rotating the vibrator at different angles, and fitting the output amplitude of the corresponding piezoelectric electrode to obtain an azimuth angle of the unbalance mass and the amplitude of the unbalance mass. By exciting the natural mode of vibration of oscillator, the vibrating amplitude of the supporting rod at different angles is measured, and fitting analysis is performed on the measured data, so that the azimuth of the unbalance mass andthe amplitude of the unbalance mass can be judged conveniently and rapidly, and the cost is extremely low.

Vibrations due to excitation of the natural modes of an aircraft's body are suppressed by an active multi-axis modal suppression system. Dedicated sensors are positioned in the aircraft at optimal locations for sensing modal induced vibrations. The sensor produced signals are processed through control logic which, in response thereto, and in response to aircraft inertial, velocity and altitude related signals produces output control signals. The control signals effect control surface deployment creating forces to suppress the natural mode induced vibrations on multiple geometric axis's. More particularly, symmetric and anti-symmetric control surface deployments are used on one or more geometric axis's to damp lateral, longitudinal, vertical and most importantly torsional vibrational modes.

The invention relates to the field of structural damage recognition, in particular to a structural damage early warning method based on empirical mode decomposition. The method comprises the steps that a vibration transmissibility function is constructed by utilizing structural response; an amplitude value of the vibration transmissibility function serves as an analysis signal; a natural mode function is obtained by an empirical mode decomposition technology; a waveform index of the natural mode function is calculated by reference to a definition of a waveform index in a signal waveform processing technology; waveform indexes before and after structural damage are compared to judge whether a structure is damaged; and structural damage early warning is performed. The method is high in operability; the processing precision is improved; and the early warning accuracy is improved.

A space damper for 4-cable bundles of overhead power transmission lines is disclosed, comprising a framework (10) where—from four support arms (20a-20b) depart, at the distal ends of which there are provided clamps for fastening electric cables, said arms (20a-20c) being constrained to the framework (10) through respective dampening hinges (30a-30c), wherein the spacer damper is configured so that the vertical, natural-mode frequencies thereof are higher than the corresponding horizontal, natural-mode frequencies thereof.

An apparatus and method for suspending a stator core (100) in an electric generator upon a foundation (206), where two natural modes of vibration, including known second and third modes, are excited in the core, each mode having four loops and four nodes displaced 45 degrees between the second and third modes. A non-rigid connection (212) connects a yoke to the foundation, and two connection members connect the yoke to the stator core at opposite sides of the non-rigid connection. The two connection points (210a,b) are located at adjacent loops of one of the second and third vibration modes. By this arrangement, radial deflections of the stator core at the respective connection points are transferred into a rocking movement of the yoke around the non-rigid connection. Thereby, vibrations transferred to the foundation are considerably reduced during operation.

A method for operating a Coriolis mass flowmeter in which the interferences when calculating the medium parameters is considered by the eigenfrequency (f01) of the oscillation of the measuring tube being determined in the first and second natural modes during operation of the Coriolis mass flowmeter, and at least one medium parameter ({dot over (m)}) is calculated with the aid of the oscillation measuring variable (Δt) by means of a calculation rule representing a mathematic relation between the oscillation measuring variable (Δt), the medium parameter ({dot over (m)}) and the eigenfrequencies (f01, f02) of the oscillations of the measuring tube in the first natural mode and the second natural mode, and the medium parameter ({dot over (m)}) being determined taking into consideration the current determined eigenfrequencies (f01, f02) of the oscillations of the measuring tub in the first natural mode and the second natural mode as well as the oscillation measuring variable (Δt).

The invention discloses a somatosensory control two-wheeled balance vehicle teaching aid system, relates to the technical field of two-wheeled balance vehicles, and a somatosensory control two-wheeled balance vehicle teaching aid combines somatosensory control with a two-wheeled balance vehicle form modern teaching aid equipment. A kinect somatosensory sensor of Microsoft enables information interaction between a man and a machine to completely get rid of traditional mouse and keyboard, game handle, remote controller and the like, and the most natural mode is utilized to have a conversation with the machine. At present no somatosensory control two-wheeled balance vehicle teaching aid exists. The somatosensory control two-wheeled balance vehicle teaching aid system provided by the invention provides a technology learning communication platform for learners, and is of great significance to education.

The invention relates to a fusion penetration control method of an active shock excitation molten pool of multiple array lasers. An electric arc heats a molten pool, the dimension of the molten pool is gradually increased; meanwhile, a laser beam splitter emits multiple array lasers which are irradiated on the molten pool and provided with impact force with a certain frequency for the molten pool; the impact force leads to the amplitude change of the molten pool and causes the change of arc length and arc voltage, and changing curve of the arc voltage is collected by an oscilloscope; when the natural mode shape of the motel pool is consistent with the acting frequency of the array laser, the molten pool generates resonance oscillation, and its amplitude is the biggest, the voltage change amplitude is also the biggest, and the molten pool is grown up to the predetermined dimension; a computer control system controls the fusion penetration of a welding line in real time according to the voltage changing amplitude. The array laser impulse frequency is 1-1000 Hz. Through the array laser frequency, dimension of the resonated molten pool is determined, namely, the dimension of the molten pool is controlled through selecting the array laser frequency, and thus the fusion penetration of the welding line is controlled. Compared with the existing molten pool shock excitation method, the fusion penetration control method is high in precision, and good in stability and repeatability.

The eye is positioned relative to a detection device in such a manner as to co-operate with the device to form a Fabry-Perot cavity having a main optical axis and comprising two opposite reflecting faces on the main optical axis, one of these two faces being constituted by a stationary reflecting element and the other being formed by the cornea of the eye. An incident laser beam is injected into said cavity so as to be centered on the main optical axis of the Fabry-Perot cavity, the cornea is aligned laterally and longitudinally relative to the main optical axis in such a manner as to obtain longitudinal interference between the go and the return laser beams reflected between the two reflecting faces of the cavity, and an optoelectronic detector is used to detect the intensity I of said interference as a function of time. The invention is applicable to measuring intraocular pressure.