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108 results about "Normal component" patented technology

In mathematics, given a vector at a point on a curve, that vector can be decomposed uniquely as a sum of two vectors, one tangent to the curve, called the tangential component of the vector, and another one perpendicular to the curve, called the normal component of the vector.

Navigation satellite orbit rapid recovery method based on short arc orbit determination and forecast

ActiveCN108761507AFast track back to normal useConvenient and seamless dockingSatellite radio beaconingRecovery methodRight-hand rule
The invention belongs to the technical field of navigation satellite precision orbit determination, and specifically relates to a navigation satellite orbit rapid recovery method based on short arc orbit determination and forecast. The navigation satellite orbit rapid recovery method based on short arc orbit determination and forecast includes the steps: through short arc orbit determination and short arc forecast, taking the distance from of the satellite at a reference epoch to the geocenter as the radial component, taking the distance from the satellite to the initial orbit plane as the secondary normal component, taking the third component defined according to the right hand rule of the coordinate system as the tangential component, taking the time rate of change of the radial component, the secondary normal component and the tangential component, and performing rapid recovery of the navigation satellite orbit through compatible user ephemeris calculation with an additional component correction value. The navigation satellite orbit rapid recovery method based on short arc orbit determination and forecast can realize seamless docking of the ephemeris solution method of the userbefore and after orbit control, can improve the accuracy of satellite orbit determination and forecast, can obtain the satellite precise orbit of the user application demand in a relatively short timeafter orbit control, and can make accurate forecast so as to enable the satellite to resume normal use and guarantee normal operation of the satellite system, and has important guiding significance for the technical field of navigation satellite orbit determination.
Owner:PLA STRATEGIC SUPPORT FORCE INFORMATION ENG UNIV PLA SSF IEU

Noise diagnosis algorithm for rolling bearing faults of rotary equipment

The invention discloses a noise diagnosis algorithm for rolling bearing faults of rotary equipment. Firstly, a sound pick-up device collects running noise signals of a rolling bearing, and the signalsare subjected to preliminary fault judgment through a bearing normality and anomaly pre-classification model based on an anomaly detection algorithm; secondly, according to a fault pre-judgment result, the abnormal signals (the faults occur) pass through a neural network filter to filter normal components in the signals of the bearing, the output net abnormal signals are connected to a subsequentfeature extraction module, and the normal signals (no faults occur) are directly connected to the feature extraction module; the feature extraction module extracts Mel-cepstrum coefficients (MFCC) ofthe signals to serve as eigenvectors, feature reconstruction is carried out by utilizing a gradient boosted decision tree (GBDT) to form composite eigenvectors, and principal component analysis (PCA)is used for carrying out dimensionality reduction on features; and finally, feature signals are input into an improved two-stage support vector machine (SVM) ensemble classifier for training and testing, and at last, high-accuracy fault type diagnosis is achieved. According to the algorithm, the bearing faults can be effectively detected and relatively high fault identification accuracy is kept;and the algorithm has relatively high effectiveness and robustness for detection and classification of the bearing faults.
Owner:CHINA UNIV OF MINING & TECH

Steel wire rope magnetic memory on-line detection device

The invention discloses a steel wire rope magnetic memory on-line detection device, and belongs to the technical field of non-destructive detection. The steel wire rope magnetic memory on-line detection device includes two groups of three-dimensional magnetoresistive sensors, adders, multipliers and subtracters, the two groups of three-dimensional magnetoresistive sensors are mounted on a steel wire rope and have the same mounting direction, and each group of three-dimensional magnetoresistive sensors comprises 8-12 three-dimensional magnetoresistive sensors uniformly distributed at a same circumference. An equilibrium and differential detection method is adopted to mainly aim to overcome steel wire rope shaking and outside interference, secondary output of signal characters is carried out, and the accuracy for judging metal member defects is improved; secondly, with adopting of a component signal single output method, whether a point is a steel wire rope defect is judged according to characteristic signals singly outputted by a normal component and a tangential component; and then, the two groups of annular uniformly-arranged three-dimensional magnetoresistive sensors HMC1053 are adopted to achieve all-dimensional inspection of the normal component and the tangential component of the steel wire rope, so as to eliminate the measured blind area problem.
Owner:TAIYUAN UNIV OF TECH

Method for monitoring fatigue damage using ferromagnetic materials surface stray magnetic field signal

The utility model discloses a method utilizing a stray magnetic field signal monitoring the damage of ferromagnetic, which belongs to the magnetic nondestructive inspection field. Ferromagnetic components do not have measurable strain in early stages of service, with difficulty to evaluate damage. The utility model, inspected material and smooth plantlike standard fatigue specimens have the same heat treatment state, and are demagnetized through high temperature, so as to get the pure initial magnetic state. And then a constant rate is imposed to pull the tension fatigue load, every stray magnetic field normal component of the surface inspecting components is unloaded corresponding to scheduled cycles, the slope Ks of different magnetic cycle curves is extracted, the critical value of the slope Ksc is determined, and the mapping relationship between the slope Ks before fatigue crack and fatigue cycles N is established. The measured components by the same value are inspected, and the measured slope Ks of the magnetic curve is compared with the critical value of the slope Ksc, and then the fatigue damage can be determined. The utility model has the advantages that the utility model has simple operation and accurate inspecting results, and dynamic monitoring the early fatigue damage of the ferromagnetic components in the unloaded state can be achieved.
Owner:ACADEMY OF ARMORED FORCES ENG PLA

Signal processing methods

We describe a method of processing an EEG and / or MEG signal to generate image data representing a 3D current distribution, J, within the brain, the method comprising: capturing a plurality of electric and / or magnetic measurements from the exterior of the head; solving an integral equation for a part of said current distribution to generate said image data representing said 3D current distribution, wherein said integral equation comprises an integral of a first function representing said part of said current distribution and of a second function (∇τvs (r, τ)) representing the geometry and conductivity of the head independent of said current distribution; wherein said solving comprises: modelling the head as at least two regions separated by at least one internal boundary, and solving a set of partial differential equations, one for each said internal region, each partial differential equation comprising a geometry-conductivity function (w(r, τ)) representing the geometry and conductivity of the respective region, wherein said solving is subject to a boundary condition that either i) the gradients of the functions across the or each said internal boundary are smooth when conductivity is taken into account, or ii) a normal component of the electric field of said part of said current distribution is continuous across the or each said internal boundary, and wherein said geometry-conductivity function for an outermost said region of said head defines said second function (∇Tvs (r, τ))
Owner:CAMBRIDGE ENTERPRISE LTD

Array ferromagnetic member surface defect detector based on leakage magnetic field double component

The invention relates to the field of nondestructive testing, particularly to nondestructive detection equipment for defects, such as cracks, air holes, slag inclusions, stress concentrations, and the like, on the surface of a ferromagnetic member. The invention provides an array ferromagnetic member surface defect detector based on leakage magnetic field double component, which is capable of performing surface scanning to the surface of the member. The detector comprises a differential array leakage magnetic probe which is composed of a normal component detection hall sensor set and a tangential component detection hall sensor set that are used for detecting a normal component voltage signal and a tangential component voltage signal of the leakage magnetic field respectively, a signal conditioning circuit which is used for conditioning a voltage signal detected by the differential array leakage magnetic probe, and a data acquisition and processing unit which is used for analyzing the voltage signal output by the signal conditioning circuit and judging if the surface of the ferromagnetic member has a defect. The array ferromagnetic member surface defect detector based on the leakage magnetic field double component has large one-time detection area, quick detection speed, high detection accuracy and low omission ratio, and can provide the data required for quantitative analysis of the defects such as the crack and the like on the surface of the member.
Owner:CHONGQING UNIV

Preloaded parabolic dish antenna and the method of making it

The back-up structure of a parabolic dish antenna, which supports its reflecting surface, is formed in this invention by preloading its radial and circumferentially placed straight structural members and hence it is termed as preloaded parabolic dish antenna. Such a preloading results in considerable reduction in its weight and also to the effort involved in its assembly. The back-up structure of the preloaded parabolic dish antenna is made of a central hub, an assembly of a suitable number of elastically bent radial structural members connected rigidly to the central hub and to the same number of straight structural members which are connected to the tips of the radial members at the outer rim of the dish and also to straight bracing members placed circumferentially at intermediate locations, which are all tensioned to specified prestress values in the absence of wind loading. The outermost rim members placed at the periphery of the dish form the aperture of the dish. The backup structure of the preloaded parabolic dish antenna is given the parabolic shape by fixing the radial members at a suitable inclination angle and location at the hub and by applying an appropriate force with a normal component at their tips so as to bend the radial members elastically such that their curvature becomes approximately the same as that of the parabolic curve between the hub and the peripheral rim point. The invention incorporates a suitable rigid connection of the elastically bent radial members and other structural members in order to store sufficient initial elastic energy in the back-up structure of the dish for resisting gravitational and static and dynamic wind forces on the parabolic dish antenna for the survival wind condition at the antenna site. This configuration also reduces moment of the wind forces and torques on the mounting tower and gear drive system of the dish antenna. This invention is also applicable to structures of geometries other than that of the parabolic dishes. The method of constructing the preloaded parabolic dish and attaching reflector panels of lightweight is also disclosed.
The preloaded parabolic dish antennas are useful in microwave communication, satellite communication, radar, radio telescope and other similar applications for receiving and/or transmitting radio waves.
Owner:TATA INSTITUTE OF FUNDAMENTAL RESEARCH

Method for identifying defect profile of pseudo three-dimensional magnetic flux leakage signal based on normal component

The invention discloses a method for identifying a defect profile of a pseudo three-dimensional magnetic flux leakage signal based on a normal component. The method comprises the following steps: selecting an identification area from a piece to be tested; filtering detected data to obtain a normal component of a magnetic flux leakage signal; multiplying a horizontal differential signal by a firstpreset multiple to obtain a horizontal component of a pseudo magnetic leakage signal; multiplying a vertical differential signal by a second preset multiple to obtain a vertical component of the pseudo magnetic leakage signal; performing pseudo three-dimensional magnetic flux leakage signal synthesis operation on the normal component of the magnetic flux leakage signal, and the horizontal component and the vertical component of the pseudo magnetic flux leakage signal to obtain a synthesized magnetic flux leakage signal; and selecting a preset threshold value to obtain a defect identification profile. According to the method, an approximate value of the horizontal component and the vertical component of the magnetic flux leakage signal can be derived from the normal component of the magnetic flux leakage signal to further construct a pseudo three-dimensional magnetic flux leakage signal so as to realize defect profile identification; and the method has higher solving precision and better identification effect compared with the traditional one-dimensional magnetic flux leakage signal defect profile recognition.
Owner:TSINGHUA UNIV
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