116 results about "Load vector" patented technology

A fault detection system and method is provided that facilitates detection of faults that are manifest over a plurality of different operational phases. The fault detection system and method use multiway principal component analysis (MPCA) to detect fault from turbine engine sensor data. Specifically, the fault detection system uses a plurality of load vectors, each of the plurality of load vectors representing a principal component in the turbine engine sensor data from the multiple operational phases. The load vectors are preferably developed using sets of historical sensor data. When developed using historical data covering multiple operational phases, the load vectors can be used to detect likely faults in turbine engines. Specifically, new sensor data from the multiple operational phases is projected on to the load vectors, generating a plurality of statistical measures that can be classified to determine if a fault is manifest in the new sensor data.

The invention relates to an online updating method of a principal component analysis monitoring model. The method comprises the following steps that: 1) A model online updating system comprising data acquisition equipment and a monitoring computer is arranged in industry field; 2) A traditional principal component analysis (PCA) modeling module uses historical data to establish a PCA initial monitoring model; 3) After the monitoring begins, a mean value variance updating module calculates a mean value and a standard deviation sigma' of a new model according to real-time process data and the current PCA model; 4) A projection point calculation module calculates a residual vector of a new sample and transmits to a residual determination module; 5) The residual determination module determines an updating method of a projection direction according to a size of a residual vector die; if the residual is large, a principal component space adjusting module is called; if the residual value is small, a principal component direction fine adjusting module is called; finally a load vector P' nk and a characteristic value matrix lambda' kk of the new model is obtained; 6) A control limit updating module carries out control limit and updating on statistical magnitude of the model; the system finally outputs the new model omega' which is used for online monitoring and fault diagnosis during an industrial process.

The invention discloses a method for analyzing static strength characteristics of a turbomachinery blade based on CPU+GPU heterogeneous parallel computing. The method comprises the following steps of firstly, establishing a finite element model, computing the total stiffness matrix of the model, then, computing the centrifugal load vector and the pneumatic load vector of the turbomachinery blade, performing displacement constraint and coupling of a node, and correcting the total stiffness matrix; and then, solving an equation set formed by the total stiffness matrix and the load vector in parallel by using CPU+GPU, obtaining a node displacement vector, then, computing the principal strain and the VonMises equivalent stress, drawing a distribution cloud picture, and finally, performing safety check. By means of the method disclosed by the invention, for static strength analysis and design of the turbomachinery blade, project planners can perform operation conveniently; simultaneously, due to an adopted CPU+GPU parallel algorithm, the computing speed of a finite element method can be effectively increased; an accurate and rapid blade static strength characteristic analysis result is provided for design of the turbomachinery blade; and the design period of the turbomachinery blade is greatly shortened.

An interactive aircraft load management system automates calculation and provides simulation capability to changes in an aircraft C.G. limit for display on a three-dimensional aircraft symbology. The aircraft load management system also communicates with a fly by wire (FBW) flight control system wherein the aircraft's control system is programmed to automatically compensate for C.G. excursions and to alter control laws. The aircraft load management system also selectively reels-in and reels out sling lines as the aircraft pitches and rolls to maintain a load vector from a slung load along the aircraft centerline. Load vector travel is accomplished by coupling a winch control system into the flight control system.

The invention provides a KPCA-based fused magnesium furnace fault diagnosis method for fault separation and reconstruction. The method comprises the following steps: acquiring historical normal data of a fused magnesium furnace, historical fault data when the fused magnesium furnace generates a fault, and test data when a fault occurs in online monitoring; performing preprocessing on the historical normal data of the fused magnesium furnace and the historical fault data; performing high-dimension mapping and then PCA decomposition on the historical normal data of the fused magnesium furnace by use of a nucleus principal component analytical method; and performing diagnosing and fault reconstruction on the test fault data when the fault occurs in the online monitoring by use of a fault load vector set, determining a fault type, and recovering the fault data to corresponding normal data so that the fault is eliminated. According to the method provided by the invention, the fault separation and reconstruction problems of non-linear data of the fused magnesium furnace are solved, the test data when the fault occurs in the online monitoring can be monitored, only a fault model corresponding to a current fault can correctly remove fault information in the data, based on this, the fault type can be determined, and the purpose of fault separation is realized.

A system for mounting an engine to an aircraft includes an engine forward mount angled toward the forward end of the engine at a first angle. At least two thrust links extend between an engine aft mount to a link support connection at a second angle. The engine aft mount is angled toward the forward end of the engine at a third angle. A projection of a load vector of the engine forward mount onto a vertical plane extending through the axis of rotation of the engine and a projection of a load vector of each of the at least two thrust links onto the vertical plane intersect the axis of rotation of the engine within a first vertical plane segment extending between a forward end of a nose of a fan assembly and forward of a forward mount interface.

Method and sensor arrangement for determining a load vector acting on a rolling element bearing (1) in operation. A plurality of N sensors (8) are provided which measure displacement and/or strain for determining displacement and/or strain in one of the elements (5, 6, 7) of the rolling element bearing (1). Furthermore, a mode shape coefficients calculator (11) is provided, connected to the plurality of N sensors (8), for determining a deformation of the element (5, 6, 7) by calculating amplitude and phase of N/2 Fourier terms representing at least one radial mode shape of the ring shape element (5, 6, 7). Also, a bearing neural network (12) is present, connected to the mode shape coefficients calculator (11), the bearing neural network (12) being trained to provide the load vector on the rolling element bearing (1) from the N/2 Fourier terms.

A hollow fan blade for turbo fan gas turbine engines is formed of two separate detail halves. Each detail half has a plurality of cavities and ribs machined out to reduce weight. These detail halves are subsequently bonded and given an airfoil shape in the forming operation. The present invention provides a hollow fan blade with internal cavity and rib geometry with improved durability that permits the bonding and forming to be performed without the need for gas pressurization. The ability to form the hollow fan blade of the present invention without gas pressurization is a result of the cavity and rib geometry and the orientation of the ribs. The ribs are tapered and transition into a compound radius of the floor that simulates the classical arch design element. The orientation of the ribs is generally in a parallel plane with the load vector that results from forming loads during the pre-form and final form operations. This orientation provides compressive stress transfer into the ribs and away from the concave and convex skins. The rib spacing is controlled where ribs can not be held in a parallel plane with the load vector.

An apparatus, system, and method may operate to solve a first equation associated with a structure of the form {−ω²M_R+iωB_R+[(1+iγ)K_R+i(K_4R)]}Y=F_R. The apparatus and system may include a definition module to define an intermediate matrix C=(1+iγ)L_M⁻¹K_RL_M^−T+iL_M⁻¹K_4RL_M^−T, a first computation module to compute a plurality of eigenvalues and eigenvectors for a second equation CΦ_C=Φ_CΛ_C, a second computation module to compute a matrix P=Φ_C^TL_M⁻¹U_R and a matrix R=V_R^TL_M^−TΦ_C, an equation solving module to solve a third equation of the form (D(ω)+PQ(ω)R)Z=Φ_C^TL_M⁻¹F_R for Z, wherein D(ω)=−ω²I+Λ_C and Q(ω)=iωΣ_R, and a product formation module to form a product Y=L_M^−TΦ_CZ, wherein the product Y is a matrix having a plurality of vectors corresponding to the plurality of load vectors acting on the structure and included in the matrix F.

An embodiment of the invention discloses a short-term load prediction method based on a GBDT (gradient boosting decision tree). The method comprises the following steps: acquiring historical load dataof N days before the prediction-waiting day, and forming an original data set A0; screening a data set B for constructing training samples from the original data set A0; constructing total sample set(X, Y) required for constructing a GBDT prediction model by the data set B; training and constructing a whole-day GBDT prediction model by the total sample set (X, Y), and prediction whole-day load vector of the prediction-waiting day according to the whole-day GBDT prediction model; segmenting the total sample set (X, Y) into 24 sample subsets by the hour, training and constructing hour GBDT prediction models respectively, and predicting 24-hour load vectors of the prediction-waiting day according to the hour GBDT prediction models; predicting the final load vector of the prediction-waitingday according to combination of the whole-day load vector and the 24-hour load vectors. The short-term load prediction precision is improved by sufficiently mining characteristics in the historical load data and constructing the different GBDT models.

The invention discloses a system design method for minor fault detection and position of an electrical traction system. The method comprises the following steps: 1) establishing an off-line data model: collecting sensor steady-state operation data of the electrical traction system and carrying out pretreatment on the off-line data; calculating values of a principal component and a residual component in different layers of subspaces of the data obtained after pretreatment and a load vector; determining and calculating a performance index and a probability density function of a principle component analysis method and a fault detection threshold; and 2) on-line fault diagnosis: processing online data; calculating a performance index of the principal component and the residual component in different layers of subspaces; and through the obtained fault detection threshold, constructing a probability matrix and carrying out fault diagnosis through Bayesian reasoning. The method can carry outeffective multi-feature description on tiny signals of an electrical drive device before occurrence of a fault, and can also carry out real-time online fault diagnosis under the condition that the model and parameters of the electrical drive system are unknown.

A lifting system (1) is used for lifting loads, for example for lifting and recovering an aircraft (2) following an accident, and has a lift (6) which can be positioned underneath a load, in particular underneath a mainplane (5) of an aircraft. The lift (6) has at least three lifting cylinders (8) or similar lifting elements and a docking head (9) for coupling to a load holding point. A measurement system is provided in order to detect the position of the docking head (9) and to measure the load vector that occurs at the docking head (9). A control device is connected to the measurement system, for mutually independent, load-controlled or movement-controlled confirmation of the individual lifting cylinder drives.

The invention provides an online crane beam stress monitoring and fault diagnosis system which comprises a plurality of stress sensors and wireless transmitting nodes which are all arranged on a crane beam, a wireless receiving station and a remote microprocessor. The stress sensors transmit collected stress signals to the corresponding wireless transmitting nodes the wireless transmitting nodes transmit the stress signals to the wireless receiving station, the wireless receiving station then transmits the stress signals to the remote microprocessor, and the stress signals collected by the stress sensors are compared with corresponding stress thresholds; position distribution of the stress sensors are acquired through rain-flow counting method fatigue life analysis, load sensitivity analysis and independent fatigue damage model based uncorrelated load vectors under local load and overall load. Implicit leak detection of the crane beam under the condition of variable load of width of a complicated production field and signal interference and attenuation during wire transmission are avoided, fatigue damage is ensured not to occur to the beam under the conditions of full life circle and full load, and safe production is guaranteed.

The invention discloses an interpolation method for a DEM (Digital Elevation Model) generated by contour lines. The interpolation method comprises the following steps: 1, acquiring and loading vector contour line data meeting specific conditions, wherein the specific conditions are: each contour line is spatially and continuously distributed and cannot be interrupted, and odd contour lines and even contour lines exist at intervals; 2, performing morphological corrosion reconstruction and morphological expansion reconstruction to generate a lower plateau image and an upper plateau image respectively; 3, performing obstacle Euclidean distance conversion to acquire a geodesic path and a geodesic distance, and performing pipelined linear interpolation to generate the DEM. The generated DEM has the characteristics of high accuracy and high fidelity and is generated by using the linear interpolation method, the DEM accuracy obtained under the condition that only contour line data are used is equal to or higher than the DEM accuracy obtained by using a map algebra method, manual intervention is not needed, the DEM is not limited by iterations, an adaptive algorithm is truly achieved, and the interpolation method can be applied to various industries.

A system, method, and computer program product is disclosed that recycle digital assertions for analyzing the test vectors to quickly and accurately calculate the switching activity at each test clock pulse or scan cycle. According to some approaches, load vector data and unload vector data are analyzed to determine toggle counts and switching activity, without requiring simulation to be performed.

The invention discloses a method and a device for generating multi-energy demand typical scenes of a comprehensive energy system. The method comprises the following steps of S1, acquiring multi-energydemand load vectors of all the days to obtain a vector set; S2, if an iterative instruction is acquired, executing S3, and if an evaluation instruction is acquired, executing S4; S3, during each iteration, determining a clustering center of the corresponding number in the vector set until a difference between a clustering error square of the current iteration and a clustering error square of thelast iteration is judged to be smaller than a preset value, and determining all clustering centers of the current iteration to be typical scenes; and S4, acquiring a value range of the number of the clustering centers, determining the clustering centers of the corresponding number in the vector set according to the values in the value range, computing a cluster evaluation index corresponding to each value, and determining all clustering centers corresponding to the minimum cluster evaluation index to be the typical scenes. Through the typical scenes generated by the method of the method, the comprehensive energy system can be comprehensively and accurately analyzed.