70 results about "Electromagnetic theory" patented technology

A golf ball surface pattern including depressions and protrusions is disclosed and claimed. In one embodiment, the depressions and protrusions are positioned on the ball according to a known dimple pattern, with some of the dimples being replaced with protrusions. In another embodiment, the depressions are positioned on the ball according to a known dimple pattern, and protrusions are positioned on the land areas. Alternatively, protrusions can be positioned on the ball according to a known dimple pattern, and depressions positioned on the land areas. The turbulence generators (dimples and protrusions) that are positioned on the land areas can be positioned manually or with a distribution scheme. In another embodiment, the turbulence generators are positioned according to a scheme based on the principles of electromagnetic theory.

The invention relates to a high-gain low-side lobe half-height waveguide wide side slot antenna. The antenna comprises the following parts: a shielding plate and a half-height waveguide wide side bias slot. The antenna is designed through a method of the combination of classical electromagnetic theory of waveguide slot and electromagnetic simulation software. The mathematic relation between radiation slot parameters at ideal state and line source aperture distribution is given out according to an Elliot theory, the slot parameters of an antenna are subjected to simulation through the electromagnetic simulation software, and the relation between the radiation slot conductivity and the slot position length is obtained according to simulation data fitting, so that all parameters of the slot are worked out, and a step of experimental debugging is canceled. Finally the shielding plate is designed for the antenna according to the requirements of gain indexes. The array antenna has the characteristics of high gain, low side lobe and low weight, and is applicable to occasions where high-power and high-definition radar antennas are required for ship-navigation radars and sea detection radars.

The invention provides a force feedback man-machine interaction system and method based on the electromagnetic theory and mobile tracking. By the adoption of the force feedback man-machine interactionsystem and method, a manipulator is allowed to use gestures to control a robot and meanwhile can feel force feedback in the operation process. The interaction system includes five parts of a local control calculator, a mobile tracking platform, a gesture recognition sensor, a magnetic force generating device and a magnetic force sensing device. The interaction method is divided into two parts ofcontrol and feedback. The control part uses the non-contact gesture based on a visual interface as control information, while the feedback part uses the non-contact force magnetic force as feedback information to reduce the physical limitation when interacting, meanwhile a mobile tracking function is added, and it is ensured that the magnetic force generating device and the magnetic force sensingdevice can keep relative positions and postures of the magnetic force generating device and the magnetic force sensing device unchanged, so that the problem of too little stress caused by the attenuation of a magnetic field is reduced.

The invention discloses a design of a novel magnetic coupling resonant wireless electric energy transmission device. The device mainly comprises parts such as a frequency tracking adaptive control system, a radio frequency power amplifier system, a power amplifier power detection system, a magnetic transmitting and receiving system and a rectifying and voltage regulating system. The system belongs to the leading field of high frequency electromagnetic theory engineering application, and solves the problem of electric energy wireless transmission robustness control. According to the device, the problem that the power and the efficiency of the conventional wireless electric energy transmission device are susceptible to interference to be obviously reduced is solved; and the device has high robustness, high reliability, intelligence and great application prospect.

The invention discloses a temperature field calculation method of a reactor based on multi-physical field coupling. Firstly, a three-dimensional simulation model of the reactor is established. Subsequently, based on the electromagnetic theory of field-circuit coupling, the current of each layer of reactor is calculated by the finite element method, and the winding loss of each layer is calculated,then the thermal density per unit volume of reactor is calculated. Finally, based on fluid-temperature coupling, the finite volume method is used to solve the temperature distribution of the reactorwith the unit volume heat density of the reactor as the heat source parameter. The temperature field distribution of the reactor calculated by the invention provides a theoretical basis for structuralperformance optimization of the reactor and online monitoring of the temperature.

The invention discloses an electromagnetic positioning system adopting a multi-sensor array, and particularly relates to design of a functional multi-sensor array carrying out spatial orientation information acquiring based on the electromagnetic theory. The electromagnetic positioning system comprises a signal transmitting device, a signal receiving device and a signal processing module. The signal transmitting device generates a needed magnetic field model through a triaxial magnetic source. The signal receiving device carries out positioning measurement on a target through the multi-sensor array, the multi-sensor array is integrated on a cube matrix through magnetoresistive sensors with the number being an integer multiple of three, and two triaxial magnetic sensors are formed and each measure a set of data of target postures. The signal processing module positions the target through a positioning algorithm transplanted to a DSP and a sensor fusion algorithm, the positioning result is corrected according to the geometric position of the multi-sensor array after primary positioning, and finally the positioning tracking result is displayed on a PC through communication with an upper computer.

The invention relates to a magnetic coupling resonance type wireless power transmission self-adaptive impedance matching system which mainly comprises a DSP control system based on a particle swarm optimization, a radio frequency power amplification system, an impedance matching system, a power emission system, a power receiving system, a rectification and filter system, a reflection coefficient detection system and a load system. The system belongs to the field of cross of high-frequency electromagnetic theory engineering and signal transmission application frontier and solves the problem of impedance self-tuning of a wireless power transmission technology. The magnetic coupling resonance type wireless power transmission self-adaptive impedance matching system solves the problem that traditionally, the efficiency is reduced when the power load is changed, has the advantages of simple structure, easiness in realization, high reliability and strong anti-jamming capability, and is based on the particle swarm optimization of DSP.

The present invention relates to an electromagnetic ground lens detection method and device used for detection of downhole electricity anomalous body. The device comprises: an electromagnetic excitation source applying a low-frequency current as an excitation source, by employing borehole casing pipe, used to excite electricity anomalous body secondary inductive electromagnetic field; and electromagnetic data collection probes, wherein the array electromagnetic data collection probes with a certain quantity are arranged on the ground to obtain a three-component electric field and a magnetic field data used for downhole electricity anomalous body and fining description. The electricity anomalous body lens imaging device and method employ a physical geography inversion method to perform inversion imaging processing of the obtained electromagnetic response data through collection to obtain conductivity parameters and geometrical parameters of the downhole electricity anomalous body through inversion. The electricity anomalous body lens imaging device and method can achieve effective identification and fining lens imaging of the downhole electricity anomalous body based on the electromagnetic theory.

The invention discloses excitation earphones which comprise two earphone diaphragms, a magnetic conductive ring, a magnetic conductive column arranged inside the magnetic conductive ring, voice coil leads which are arranged between the magnetic conductive ring and the magnetic conductive column and are connected with one tail ends of the two earphone diaphragms respectively, two magnetic conductive sleeves and two excitation coils, wherein the excitation coils are in electric connection with a power source and are arranged in the space encircled by the magnetic conductive ring, the magnetic conductive sleeves and the magnetic conductive column. According to the excitation earphones provided by the invention, a coil is added on a highly magnetic conductive material through adopting the electromagnetic theory and a direct current supply manner, so as to form a traditional permanent magnet, the tone quality can be arbitrarily adjusted, and the structure is simple.

The invention relates to the design of a trailer lamp system for energy and signal wireless synchronous transmission. The system mainly comprises a power source, an energy and signal transmitting system, an energy and signal receiving system and a trailer lamp load unit. The system belongs to the leading edge crossing field of high frequency electromagnetic theory engineering and signal transmission application and solves the problems of trailer lamp power supply and control signal synchronization wireless transmission. The system solves the problem of complexity in the operating process of a trailer lamp traditionally, improves the reliability of the trailer lamp, and is a device which is simple in structure, high in reliability, good in electromagnetic compatibility and capable of having a large application prospect.

The invention discloses a wireless power transmission impedance automatic matching device. The device mainly comprises a digital signal processing (DSP) control system, a contactor array controller, a stepping motor, a driving system of the stepping motor, an impedance adjusting system, a reflection coefficient detecting system, a capacitance position detecting system and the like. The system belongs to fields of a high-frequency electromagnetic theory and the frontier domain of the control engineering application of the theory; the influence of different impedances on power wireless transmission power and efficiency is prevented; and the whole performance of power transmission is improved. The invention does not only provide the impedance matching device which is wide in frequency band, intelligent and high in reliability and improves the intelligent level of conventional matching, but also provides the impedance adjusting system applicable to power transmission aiming at the characteristics of wireless power transmission for the first time.

The invention discloses a rapid design method for a dielectric composite absorbent. The rapid design method comprises the following steps of: simplifying a transmission line model based on a metal backing according to an electromagnetic theory and a wave absorbing principle to obtain a dielectric absorption model; and performing dielectric parameter scanning, three-dimensional reflection loss cloud picture projection, resonance point redrawing and equal-reflectivity circle introduction on the model to obtain a five-dimensional design model based on the equal-reflectivity circle. According to the model and the method, the wave absorbing performance of the absorbent can be evaluated, a modification path can be provided, reference and basis are provided for material selection and subsequent preparation of the dielectric type absorbent, and research and development of the absorbent are accelerated.

A disclosed method for determining nano-fluid suspension stability comprises: on the basis of the relationship of particle mass fraction and conductivity of an electrolyte fluid suspension in Maxwell electromagnetic theory, taking a nano-fluid as a mixture same to an electrolyte solution, taking the base fluid of the nano-fluid as the conductor and taking nano-particles in the nano-fluid as small spheres distributed in the conductor, so as to establish a model; measuring the conductivity of various nano-fluids with known mass fraction, fitting to obtain a relation expression between the conductivity of nano-fluids and mass fraction of nano-particles contained in the corresponding nano-fluids; and measuring the any-moment conductivity of a nano-fluid of which the suspension stability is to be determined, according to the fit relation expression of nano-fluid conductivity and mass fraction, obtaining the mass fraction of the nano-fluid of which the suspension stability is to be determined, and determining the stability of the nano-fluid of which the suspension stability is to be determined. The determination method is simple and easy to realize, can help to realize quantitative analysis and is not restricted by particle concentration and quantity.

The invention discloses a method for calculating a deflection angle corresponding to maximum coil mutual inductance on a spatial scale, and belongs to the technical field of wireless power transmission. According to the method, a spiral coil with a circular section is used as an analysis object, model space parameters are reduced in a coordinate rotation transformation mode, and directional pitching analysis is carried out on a secondary coil in a space range. In the aspect of mutual inductance formula calculation, a mutual inductance calculation formula of a coupling coil at a spatial position is derived by adopting an optimization method of a Taylor series expansion formula according to a Neumann electromagnetic theory. An analysis result shows that when a transmitting coil is fixed at an original point and a receiving coil is located at any spatial position, a unique pitching deflection angle can be always found such that the mutual inductance between the coupling coils is in a maximum state. Moreover, under the condition that the parameters of the coil are known, a specific equation relation exists between a pitching rotation angle and the spatial position of the primary centerof the secondary coil. According to the method, the deflection angle corresponding to the optimal mutual inductance of a model can be effectively calculated through the formula.

The invention relates to an intelligent assembling toy and an electric experiment teaching aid, in particular to an electromagnet pendulum electronic building block and a building block circuit. A self-locking switch module building block, a reed pipe building block, an inductive coil building block, a power supply building block and an electromagnet pendulum are assembled and connected together according to the building block circuit by using a guide vane building block. Due to uniformly utilizing the building block to assemble, compared with the prior art of utilizing a flexible circuit conductor to connect, assembling speed is high, and strong ornamental value is possessed. Due to the fact that the self-locking switch module controls on-and-off state of the current of the electric inductive coil, a permanent magnet is arranged on a pendulum hammer of the electromagnet pendulum, and a magnetic field generated by the electric inductive coil repels the permanent magnet of the pendulum hammer, back-and-forth swinging movement of the pendulum hammer is achieved, profound electromagnetic theory knowledge is expressed in a direct viewing mode through a building block toy, knowledge and interestingness are integrated into a whole, and interest of learning scientific knowledge is easy to arouse.

The invention provides a tossing machine, and particularly relates to a long-distance electromagnetic tossing machine which belongs to the field of firefighting and lifesaving. According to the electromagnetic theory, high-voltage pulse current is input in a coil of the electromagnetic tossing machine to enable that a strong magnetic field is generated in the coil, a launch push rod is sucked in a launching tube under the suction action of the magnetic field, and as the launch push rod moves forwards, lifesaving equipment is tossed around a trapped person or a person in water accurately at full speed and with the longest distance, so that the trapped person or the person in water can be saved quickly; meanwhile, when ice slush is condensed on high-voltage lines, ice removing can be performed in the case of electricity and electric shock accidents can never happen; and when a fire takes place, the electromagnetic tossing machine can toss fire extinguishing bombs and lifesaving equipment. The electromagnetic tossing machine comprises an electromagnetic tossing machine casing (1), a sight blade (2), the coil (3), the launching tube (4), the launch push rod (5), a spring (6), a scale (7), a launch push rod base (8), a rear cover (9), a current controller and launch switch (10), a power cord (11) and the like.

The invention relates to an underwater explosive perforation bullet which is characterized by comprising a bullet body; a blind hole is disposed on the bullet body and sequentially provided with propellant powder and a perforation bullet, and a leading wire through hole is disposed on the bottom of the blind hole; a primer cap is buried in the propellant powder, and a leading wire of the primer cap is exposed out of the bullet body along the leading wire through hole. By utilizing the electromagnetic theory, the underwater explosive perforation bullet is absorbed on a hull part needing perforation, then the bullet is pushed by the powerful pressure generated by dynamite exploitation to impact an armor plate of the hull, thereby a hole with the same diameter with the bullet is drilled on the hull. The underwater explosive perforation bullet can conveniently, rapidly and easily drill the needed hole on the submerged armor plate hull.

The present invention provides an electromagnetic cutting knife implementing method based on time reversal transmission and belongs to the field of spatial propagation and control of electromagnetic waves. The method comprises the steps that: based on a time-reversal electromagnetic theory and by virtue of a space-time synchronous focusing and transmission mechanism of TR (Time Reversal) electromagnetic waves, array elements, arranged on a source array on an expected cutting track, asynchronously transmit signals at a certain time interval, and signals received by secondary generation source arrays arranged around the source array are reversed on a time axis, so that time reversal waveforms are obtained; and finally, the source array is removed. the obtained time reversal wave forms are respectively fed into each array element of the corresponding secondary generation source arrays and are synchronously transmitted, i.e. motion of an electromagnetic wave focusing point along the predicted cutting track can be implemented and dynamic focusing of the electromagnetic waves is implemented. According to the method provided by the present invention, the focusing transmission mechanism of the time reversal is utilized and required excitation waveforms can be obtained accurately and efficiently by once forward transmission of a source array signal, so that dynamic focusing of the electromagnetic waves on the expected cutting tracking is implemented.

The invention provides a method for wireless synchronous transmission of electric energy and signals. A trailer lamp system with energy and signals in wireless synchronous transmission mainly comprises nine parts including a DSP control system, a signal transmitting system, a radio frequency power amplifying system, an electric energy and signal transmitting system, an electric energy and signal receiving system, a rectifying and voltage-regulating system, a signal demodulating system, a control system and a load. The trailer lamp system belongs to the crossing field of high frequency electromagnetic theory engineering and signal transmission and application leading edge, and achieves the effect of wireless synchronous transmission of the electric energy and the signals. The trailer lamp system solves the problem that wireless transmission of the electric energy and wireless transmission of the signals interfere with each other traditionally, and provides a design concept of synchronous transmission of the electric energy and the signals. The wireless synchronous transmission method of the electric energy and the signals is simple in structure, easy to implement, high in reliability and strong in anti-jamming capability.

The invention discloses a multifunctional Lenz law demonstration apparatus. The multifunctional Lenz law demonstration apparatus comprises a horizontal box and a vertical box, wherein the vertical box is arranged in the middle part of the horizontal box; one side of the vertical box is provided with a display, a first switch, a second switch, a first binding post, a second binding post, a power interface and a metal ring which is suspended through a silk thread; a first metal rod is arranged on the horizontal box at the same side; the first metal rod is arranged on one side of the metal ring; a first coil is twisted around the first metal rod; the other side of the vertical box is provided with a red LED lamp, a green LED lamp, a third binding post and a fourth binding post; a horizontal track, a mobile trolley and a fixed trolley are arranged on the horizontal box at the same side; the mobile trolley is slidingly coordinated with the horizontal track; and the fixed trolley is fixed on the horizontal track. Through simple operation, the multifunctional Lenz law demonstration apparatus can visually verify a plurality of classical electromagnetic theory laws, is suitable for research style experimental teaching, and conforms to a teaching idea, in modern education, for advocating improvement of operational ability, observation ability and problem analyzing ability.