264 results about "Surface displacement" patented technology

The invention discloses a CFD (computational fluid dynamics) / CSD (circuit switch data) coupled solving nonlinear aeroelasticity simulation method, comprising: firstly, carrying out calculation initialization; then solving the CFD of unsteady aerodynamic force; converting boundary load information; solving the CSD of nonlinear structure dynamic response; judging whether to exist computation or notby taking the response of structural finite-element mesh point displacement as a convergence criteria; if not exiting, carrying out the dynamic mesh deformation of a flow field after the surface displacement information of a computation model is converted; and then, continuing to compute until the convergence criteria is satisfied, thus finishing computation. By means of the simulation method disclosed by the invention, the problem of pneumatic nonlinearity and structural nonlinearity coupling and the problem of geometric large deformation dynamic mesh can be solved; and the simulation methoddisclosed by the invention can be applied on the nonlinear aeroelasticity analysis of aerospace aircrafts and the nonlinear aeroelasticity analysis of civil high-rise buildings and bridges.

The invention relates to a method and a system for monitoring and warning a pipeline landslide based on a fiber Bragg grating and a method for constructing the system. The monitoring is performed on four parts including landslide depth displacement, landslide surface displacement, thrust of landslide on a pipeline and pipeline strain, and comprises the steps of: firstly, inserting an inclinometerpipe (1) pasted with a fiber Bragg grating sensor from the landslide (13) to all potential sliding surfaces (15); secondly, embedding a slender concrete ground beam (2) of which two ends are fixedly restrained and the axial direction of a central reinforced bar (17) is stuck to a ground beam fiber Bragg grating sensor (20) in a direction vertical to the deformation direction of the landslide (13)below the surface of the landslide (13); thirdly, measuring the thrust of the landslide (13) on the pipeline by using an earth pressure cell fiber Bragg grating sensor (4) fixed on the pipeline (14);and fourthly, arranging monitoring sections on edges on two sides and the pipeline (14) in the center of the landslide (13), and uniformly arranging three pipe strain fiber Bragg grating sensors (3) on each monitoring section to monitor the axial strain of the pipeline (14).

The invention relates to a monitoring and prewarning system and a monitoring and prewarning method for geological disasters. The monitoring and prewarning system for the geological disasters comprises a plurality of global navigation satellite system (GNSS) monitoring stations 1, a continuous operational reference system (CORS) 2, a 3rd-generation (3G) wireless network or wireless bridge 3, a microwave communication system 4, a monitoring and prewarning server 5, a monitoring and prewarning central computer 6 and the like which are arranged in a monitored area. Each GNSS monitoring station 1 comprises a global positioning system (GPS) receiver 11, a 3G network transmission component 12, video monitoring equipment 13, a microwave communication transmission component 14, a power supply 15 and the like. In the method, the aims of forecasting and prewarning possibly initiated geological disasters automatically in real time can be fulfilled by setting the GNSS monitoring stations in areas liable to the geological disasters, monitoring ground surface displacement in real time by the CORS, performing real-time ground surface displacement monitoring on the geological disasters, such as collapse, landslide, debris flow, surface collapse, subsidence, ground fissure and the like, which can be caused by ground surface displacement, combining remote video monitoring, performing data processing on monitoring information, and automatically issuing prewarning information.

An image which is determined by surface is captured and stored by sensing device. Subsequently, at a second image corresponding to a displacement of the surface is captured and stored. The two images are repeatedly compared at different offsets in a displacement direction. Theoretically, the most extreme value of the comparison will occur at the image offset that corresponds exactly with the actual displacement. However, typically none of the comparison offsets correspond exactly with the actual displacement, therefore interpolation between the comparison offsets is required. The method of comparing the images, as well as the method of interpolating to determining the image offset corresponding to the extreme value of the comparison can both contribute to systematic errors in estimating the displacement of the surface from the images. Herein, the systematic errors are rejected by correlation-based comparison systems and methods which reduce the curvature of the correlation function for offsets which bound the extreme value, and by interpolation systems and methods which are relatively insensitive to the asymmetry of the correlation function value points selected as the basis for the interpolation. These systems and methods allow fast, highly accurate, displacement determinations using relatively simplified calculations and relatively few correlation function value points. Thus, such a displacement measuring system can track high speed displacements with high accuracy. The systems and methods are especially suitable for measuring displacement of a surface using speckle images.

A slope monitoring and early warning system based on deformation data comprises a plurality of surface displacement devices and a communication base station. The surface displacement devices send collected data information to the communication base station, and data interaction is carried out between the communication base station and a far-end monitoring center. According to a slope monitoring and early warning method based on the deformation data, a slope stability computational formula is deduced according to measured point displacement values and angle deviation values through analysis on a slope deformation instability mechanism based on theories of rock and soil mechanics. Dangerousness states on a slope are judged according to slope stability coefficient indexes, and therefore dangerousness classification on the slope can have fixed indexes and standards. The slope monitoring and early warning method based on the deformation data is different from the existing displacement-time method that different slopes have different early warning displacement values.

The invention discloses a test method of karst water burst when tunneling, comprising the following steps of: preparing materials; filling materials; embedding elements; embedding a water tank; injecting water and monitoring, tunneling and monitoring, etc. The invention further discloses a monitor device used for the test method of the karst water burst when tunneling, comprising a module frame fixed on a base, a preset water tank, a water pressure loading mechanism, a stress field monitoring mechanism, a deformation field monitoring mechanism, a temperature field monitoring mechanism, a seepage field monitoring mechanism, an acoustic emission field monitoring mechanism, a module surface displacement deformation observing mechanism, a module deformation and water burst observing mechanismin tunnels after tunneling, a fiber demodulation device and a computer. The invention simultaneously can research the change regularity of premonitory multi field information which induces the water burst when tunneling at different water body containing positions and under different water pressure conditions, has wide application, high reliability, abundant collecting data, high test precision, etc.

A non-contact system utilizing an air-propagated ultrasound for monitoring biometric parameters is disclosed. A non-contact sensor transmits an ultrasonic wave toward a subject. The wave is reflected by the subject's skin surface back toward the sensor. Electronics in the sensor measure the small changes in displacement of the skin surface to derive a plurality of biometric parameters, including but not limited to respiration rate, heart rate, eye motion, and limb movement.

A comprehensive monitoring system for a side slope and a landslip is capable of comprehensively monitoring surface displacement and depth displacement of a slope body, soil pressure of a retaining structure, and internal force of an anchoring structure, and realizing high-efficient acquisition and automation treatment of data. The comprehensive monitoring system for the side slope and the landslip comprises a side slope surface displacement monitoring unit, a side slope supporting structure stress monitoring unit, a side slope interior deformation monitoring unit and a data acquisition and transmission device, wherein the side slope surface displacement monitoring unit is arranged on a side slope surface and adopts a stay cord type fiber bragg grating displacement sensor; and two ends of the side slope surface displacement monitoring unit are respectively fixed on the side slope surface and the top of a slope body retaining structure; the side slope supporting structure stress monitoring unit consists of fiber bragg grating pressure boxes vertically embedded on the back of the slope body retaining structure at intervals, and a fiber bragg grating force gauge arranged on a slope body anchoring component; the side slope interior deformation monitoring unit is a fiber bragg grating intelligent anchoring rod embedded in the slope body by drilling a hole; and the data acquisition and transmission device consists of a multi-channel wavelength demodulator and a monitoring computer.

An inspection system is provided to examine internal structures of a target material. This inspection system includes a generation laser, an ultrasonic detection system, a thermal imaging system, and a processor / control module. The generation laser produces a pulsed laser beam that is operable to induce ultrasonic displacements and thermal transients at the target material. The ultrasonic detection system detects ultrasonic surface displacements at the target material. The thermal imaging system detects thermal transients at the target material. The processor analyzes both detected ultrasonic displacements and thermal imagery of the target material to yield information about the target material's internal structure.

In a method of critical displacement forecast based on the deformation failure mechanism of slope, a sliding surface displacement, a calculation based on status stability factors and a slope surface displacement are determined, and applied for forecast based on a thrust-type slope deformation mechanism, a key compartment division, a relation between stress and strain mechanics properties of sliding surface of geo-material, and an analysis of evolution characteristics at different points of the sliding surface. The method provides advantages of determining deformation values at different points of a sliding surface, a slope body and a slope surface during slope failures; describing the process of a progressive failure, deformations and force changes of a slope; combining slope monitoring values to perform the stability analysis and the calculation of the magnitude of the stability factors in different deformation statuses of the slope; and assessing the durability of protective measures to the slope.

A technique for acoustic detection of a disbond within a bonded structure involves thermal excitation of the surface of the bonded structure to induce a lifting and membrane vibration and is applicable to laminates and coated structures, as well as foam core structures or a honeycomb structures. The technique does not require access to both sides of the bonded structure. A large etendue interferometer is used to provide surface displacement measurement. The surface displacement measurement can be analyzed both by frequency or amplitude to determine existence of a disbond by membrane vibration, and further a thickness of the disbond can be determined using traditional pulse-echo time analysis. The technique may allow detection of stick bonds.

An imaging system and method are provided that use imaging information relating to positions of one or more retroreflectors attached to one or more surfaces of an object of interest to determine the shape and / or displacement of the surface or surfaces on which the retroreflector or retroreflectors are located. A variety of types of information may then be ascertained based on the determination as to the shape and / or displacement of the surface of the object, such as the value of some physiological parameter of a patient, internal and external pressure of an object, acoustical vibrations sensed by a microphone, positions of fingertips on a keyboard, etc.

The invention discloses an experimental method for top plate seepage and water inrush when in underwater exploitation as well as an apparatus thereof, comprising the steps of: (1) putting a configured experimental material in a model box according to the practical relative position; (2) exerting lateral pressure on the model material in the model box; (3) sealing the top part of the model box and exerting the stated water pressure on the top part of the model; (4) acquiring water pressure data, tectonic stress data, displacement digital photos and crack digital photos magnified by certain times at regular intervals in the exploitation process until the water inrush destruction takes place; (5) repeating the steps of (1), (2) and (3) to change lateral pressure and water pressure parameters, and repeating the step (4); and (6) obtaining the relation between the water pressure at the top part, the tectonic stress and the model surface displacement, model surface crack. The method and apparatus can embody the combined action of tectonic stress and water pressure at the top part and deadweight function of cover layer more factually, thereby improving the testing precision.

A technique is disclosed for generating a new contour and / or a 3D surface from contour data using a surface displacement field. The technique is preferably applied to un-contoured target images within a 4D image sequence for which contour data is desired. The technique can be initialized with contour data related to a reference image that has already been contoured, e.g. by a doctor who manually enters contour information into a computer. Image registration (calculation of correspondence between the reference image and target image) can be performed simultaneously with segmentation (identifying regions of interest in the target image). This allows one to make use of segmentation information in a reference image to improve the accuracy of contouring within the target image.

A disk brake lathe has a pair of tool bits mounted to tool holders which are translatable parallel to a lathe axis to adjust the separation of the tool bits from a brake disk. A displacement gauge responds to changes in the separation between the tool holders. When the tool bits are in continuous contact with the disk, the separation indicates the thickness which would result from machining the disk. This separation can be compared to a specification to determine whether to machine or discard the disk. A method for machining a disk starts by mounting and aligning the lathe to a wheel hub on which the disk is mounted. The tool bits are each advanced until they are in continuous contact the disk surfaces, when the separation of the tool bits is measured and preferably compared to a specification. When the tool bits are sequentially advanced, variation in the separation can be used to determine depth of cut for each tool bit. A system employing a brake lathe has a microprocessor which receives signals responsive to the separation between the tool bits of the lathe. One or more contact sensors indicate contact of the tool bits with the other tool bit or the brake disk, and the microprocessor can implement instructions to practice the above method. A surface displacement gauge can be employed to allow the system to measure the thickness and lateral run-out of the disk prior to machining.

The invention discloses an ocean engineering pile foundation experiment simulation apparatus and method under long-term horizontal cyclic loading. The apparatus comprises: an osmotic force system which provides continuous pressurized water for a saturated sandy soil foundation so that a uniform osmotic flow field forms in the sandy soil foundation to simulate a hyper-gravity environment; a displacement control loading system and a force control loading system that apply horizontal cyclic loadings to an offshore wind turbine superstructure model; a measuring system used for measuring water pressure before the entry into the saturated sandy soil foundation, displacements of the offshore wind turbine superstructure model and a pile model, strain of the pile model, and surface displacement of sandy soil; an uninterrupted power supply system used for powering the osmotic force system, the displacement control loading system, the force control loading system and the measuring system, thereby ensuring all systems can run stably in a long time; the invention also provides an experiment method of the apparatus; the apparatus and the method are widely applicable and suitable for various ocean engineering structures such as oil platforms and offshore wind turbines.

The invention relates to a method for quantitatively measuring the inhomogeneous deformation of a nano-crystal material. The method comprises the following steps: firstly processing the measured nano-crystal material into a stretching sample, selecting a marking area on the stretching sample and marking the stretching sample; secondly, putting the stretching sample into a mechanics testing machine, and loading the stretching sample under the condition that the quasistatic strain rate of a displacement control mode at room temperature is 10<-4>s<-1>; obtaining data and displaying a stress strain curve by a material testing system of the mechanics testing machine, adopting a digital camera to acquire the image on the surface of the sample at the same time of loading, and recording the image by connecting the digital camera with a computer; and finally, carrying out digital image processing on the image acquired by the digital camera in the process of stretching to obtain the surface displacement and a stain field image of the tested image in the process of stretching. The method measures the cause of formation of a shear zone in a simple mode with low cost, so the method can have wide application prospect in the fields of modern mechanics, microelectronic technology, ultraprecise processing technology, nanometer technology, and the like.

A water level automatic control system of a landslide physical model test comprises water tanks, a control cabinet and a slope surface information acquisition device. Two water tanks are respectively arranged at the front and at the back of a landslide physical model test frame. Side faces of the two water tanks, which are contacted with a landslide model, are respectively provided with a plurality of groups of water feeding and discharging holes. Bottoms of the water tanks are connected with water inlet pipelines and water outlet pipelines respectively, water pumps and water inlet electromagnetic valves are arranged on the water inlet pipelines, and water outlet electromagnetic valves are arranged on the water outlet pipelines. Liquid level transmitters for monitoring water levels in the water tanks are arranged in two water tanks, the control cabinet is respectively connected with all the liquid level transmitters, the water pumps, the water inlet electromagnetic valves and the water outlet valves and used for receiving water level signals and controlling opening and closing of the water pumps and the electromagnetic valves, and the slope surface information acquisition device is arranged above the water tank arranged at the front of the landslide physical model test frame. The water level automatic control system of the landslide physical model test can monitor parameters of landslide surface displacement and the like under the condition of stored water level variation precisely and comprehensively and provide an important basis for landslide stability studies.

The invention discloses a safe mine pressure monitoring method and device for a roof and relates to the technical field of safe mine pressure monitoring. The method is used for carrying out simultaneous monitoring on anchoring force, the stability of deep wall rocks of the roof and the surface deflection at a same fracture surface of a roadway or a chamber. The device comprises a roof abscission layer monitoring device, an anchoring force monitoring device, a deep displacement monitoring device and roadway surface displacement monitoring devices, wherein each device is connected with a ground control system through a transmission system, and the monitoring devices are provided with signal acquisition components to realize simultaneous online monitoring and lag monitoring. According to the safe mine pressure monitoring method and device for the roof, the comprehensive comparative analysis is carried out on the anchoring force, the abscission volume and the deflection numeral value of the roof and the composite multi-index comparison is utilized to warn and predict the safety of the roof, strong guarantees are provided for the safe production of underground projects such as coal mines and metal mines.

The present invention relates to a real-time long-range wireless monitoring system and its method for side slope and coast, and belongs to the field of preventing method of long-range real-time monitoring for side slope and coast disaster. The traditional long-range monitoring method or apparatus for coast disaster mainly refers that the information gained from monitoring and analyzing the surface displacement of side slope and the geology condition is transmitted or monitored. And the shortage thereof is that the transmitting and monitoring cannot be achieved before the displacement of a landside mass. The present invention adopts that a tip of an anchorage cable which is positioned above a glide plane is provided with a sensor, the monoblock prestressing of the anchorage cable on the part of a sliding shoe is transmitted, the signal is continuously collected, magnified, emitted, and received, and the computer and the software are used to deal with the received information according to the relation between the sliding force monitoring data of the side slope and the prestressing monitoring data of the anchorage cable, thus gaining the displaying method of the relation between the sliding force and the time, monitoring the condition of a slide mass in a real-time way, and accurately receiving the information of internal condition thereof in time, therefore the coast danger can be detected. At the same time, the present invention can also provides the information of ensured addition and maintenance of the anchorage cable, thereby preventing the waste and saving the cost.

A system and method for detecting ultrasonic surface displacements at a remote target are disclosed, one embodiment of the system comprising: a first laser to generate a first laser beam. The first laser beam produces ultrasonic surface displacements on a surface of the remote target. A second laser generates a second laser beam operable to detect the ultrasonic surface displacements on the surface of the remote target and to provide a reference beam to an interferometer. The second laser beam is split, at a beam-splitter, into a pump beam and a probe beam. The pump beam is amplified by a first amplifier and the probe beam is amplified by a second amplifier. The pump beam is then provided to the interferometer as a reference beam and the probe beam is directed to the target to detect the ultrasonic surface displacements. The first and second amplifiers can be controlled independently of one another to control their respective laser beam's power. Collection optics collect phase modulated light from the probe beam either reflected or scattered by the remote target, which can be optionally optically processed to increase the light intensity. The interferometer is a TWM interferometer that receives and processes the phase modulated light and generates at least one output signal based on the phase-modulated light and the amplified reference laser beam.

The invention discloses a camera detecting method and device applied to slope safety monitoring. O the basis of complexity of the slope, easily recognizable identifier bodies are arranged on the slopeto reflect the slope state; and most important space coordinates of the target array are obtained. A certain number of monitoring target points are set on the slope surface; two slope-surface displacement intelligent high-definition cameras collect slope images; on the basis of a sub-pixel search algorithm, image coordinates of the monitoring points are extracted; and three-dimensional coordinates of the monitoring points are calculated based on a conversion relationship between an image plane coordinate system, a camera coordinate system, and a measurement coordinate system and the surface displacement of the slope is identified. Therefore, the camera detecting method and device have advantages of having high feasibility and being easy to implement.

The invention aims to provide a slope stability detection and pre-warning method on the basis of simultaneous monitoring of horizontal displacement and vertical displacement of a slope crest of a foundation pit. The method includes the steps: selection of foundation pit excavation slope displacement monitoring points and datum points; arrangement and installation of displacement monitoring equipment; real-time monitoring of foundation pit excavation slope surface displacement and real-time processing of monitoring data; determination of foundation pit excavation slope vertical displacement vector angle parameters and sequence thereof; determination of pre-warning criterions for stability of the foundation pit excavation slope vertical displacement vector angle parameters; evaluation on dynamic stability of foundation pit excavation slopes and monitoring and pre-warning of instability. By coupling of horizontal displacement and vertical displacement of the foundation pit excavation slopes, an included angle formed by a foundation pit excavation slope surface displacement vector and the horizontal plane is defined as a vertical displacement vector angle, and evaluation and real-time monitoring and predication of dynamic stability of the foundation pit excavation slopes and pre-warning of instability are realized.

A system, program product, and method to perform automated three-dimensional image registration of a part within an inspection cell, are provided. The system can include a laser-ultrasound inspection device having a scanning head to generate ultrasonic surface displacements in a part, an inspection laser, and an interferometer to collect phase modulated light reflected by the part. The system can also include a part position locator positioned to measure a distance between points on a surface of the part and a scanning laser reference location. The system can also include a database containing computer-aided design models for each part of interest, and a model of the inspection cell. The system can further include a laser ultrasound inspection computer communication with the laser-ultrasound detection device and the part position locator, and laser ultrasound inspection program product adapted to perform automated three-dimensional image registration of the part.

An inspection system (200) is provided to examine internal structures of a target material (216). This inspection system includes a generation laser (210), an ultrasonic detection system (220, 226, 228, 230), a thermal imaging system (234), and a processor / control module (232). The generation laser (210) produces a pulsed laser beam (212) that is operable to induce ultrasonic displacements and thermal transients at the target material (216). The ultrasonic detection system detects ultrasonic surface displacements at the target material (216). The thermal imaging system (234) detects thermal transients at the target material (216). The processor (232) analyzes both detected ultrasonic displacements and thermal imagery of the target material (216) to yield information about the target material's internal structure. The target material (216) preferably comprises composite material.