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WO2017074173A2 - Système et procédé d'évaluation de la santé d'une structure ou d'un bâtiment - Google Patents

Système et procédé d'évaluation de la santé d'une structure ou d'un bâtiment Download PDF

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Publication number
WO2017074173A2
WO2017074173A2 PCT/MY2016/000070 MY2016000070W WO2017074173A2 WO 2017074173 A2 WO2017074173 A2 WO 2017074173A2 MY 2016000070 W MY2016000070 W MY 2016000070W WO 2017074173 A2 WO2017074173 A2 WO 2017074173A2
Authority
WO
WIPO (PCT)
Prior art keywords
building
light
image capturing
reflected
capturing means
Prior art date
Application number
PCT/MY2016/000070
Other languages
English (en)
Other versions
WO2017074173A3 (fr
Inventor
Chin Hong Lim
Original Assignee
Chin Hong Lim
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chin Hong Lim filed Critical Chin Hong Lim
Publication of WO2017074173A2 publication Critical patent/WO2017074173A2/fr
Publication of WO2017074173A3 publication Critical patent/WO2017074173A3/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
    • G01M5/0033—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining damage, crack or wear
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
    • G01M5/0091—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by using electromagnetic excitation or detection

Definitions

  • the present invention generally relates to assessment systems, and more particularly to a method and system for real-time assessing and monitoring of structural health for elevated structures or buildings.
  • United States Patent 8,886,468 discloses a system and system for monitoring the structural integrity of structural members of a building.
  • the system comprises a plurality of RFID tags; each of which is attached to at least one structural member adapted to transmit data based on two states of the building; one being a normal state and second is an abnormal state; and a transceiver. While this system may collect the relevant data to determine the health status of a building, the use of RFID tags is often associated with being expensive; especially active tags such as disclosed in US '468. Further, transmission of data is debatably less reliable compared to conventional systems. This is partly because the transmission of data by RFID tags can be easily interrupted by any other metal-based elements or components that emits electromagnetic energy. These tags are also known for being vulnerable to damages.
  • United States Patent US 8,131 ,008 discloses another apparatus and system for measuring and inspection of structural components.
  • the system includes a light source, a camera, a first memory storage, a second memory storage, and a processing unit.
  • this system is for inspecting structural components; it is substantially adapted for inspecting solely pre-engineered; hence loose components; therefore may not be as effective for assessing the current health or conditions of constructed buildings or structures.
  • a system for real-time assessment and providing a health condition of a structure or building comprising: at least one light emitting means mounted on a surface of a building or structure adapted for emitting collimated light towards and reflected on another surface of the building; at least one image capturing means positioned adjacent to the surface of which the light is being reflected; adapted for capturing continuous images of the reflected light; a processor adapted for receiving captured images from the image capturing means and for assessing the received images; wherein the building relative vibrations and differential settlements are assessed using the captured images of the reflected light; and generating a building health condition based on the assessment.
  • capturing continuous images of the reflected light enables tracking the movements of the reflected light emitted from the light emitting means.
  • generating a building health condition based on the assessment includes predicting a health condition of the structure or building.
  • the image capturing means is mounted on a support structure of the building and the light emitting means is mounted on another support structure of the building; which is adjacent to that of the image capturing means such that the image capturing means is able to capture continuous images of the light being reflected.
  • the system further includes a reflector being mounted at the surface of which the light is directed; for reflecting the light.
  • the system further includes a holding arm adapted for holding the image capturing means at an adjustable angle or distance from the surface of the building on which the light is being reflected.
  • the processor is further configured to generate at least one output that includes information suggestive of the health condition of the building based on one or a combination of the following past and current data: relative vibration amplitudes; relative vibration frequencies relative vibration time constants, and differentiate settlements.
  • the processor if the relative vibration amplitude increases; the processor generates an output to contain one of the following conditions: cracks developed in the concrete structure; foundation of the building is deteriorating or the soil around the foundation has eroded: or a combination of conditions thereof.
  • the processor if the relative vibration frequency reduces; the processor generates an output to contain one of the following conditions: cracks developed in the concrete structure; foundation of the building is deteriorating or the soil around the foundation has eroded: or a combination of conditions thereof.
  • the processor if the relative vibration time constant reduces; the processor generates an output to contain one of the following conditions: cracks developed in the concrete structure; foundation of the building is deteriorating or the soil around the foundation has eroded: or a combination of conditions thereof.
  • a method of real-time assessment and providing a health condition of a structure or building comprising: mounting a light emitting means on a surface of a support structure the building; mounting an image capturing means on a surface adjacent to that of surface of which the light from the light emitting means is being reflected; emitting light which is directed to the surface of which the image capturing means is mounted on; reflecting said light; tracking the reflected light by capturing continuous images of the reflected light; sending the captured images to a processing means for assessment and generating an output that contains the health or integrity condition of the building.
  • positioning an image capturing means comprising mounting a holding arm for holding the image capturing means; wherein at least one end of the holding arm is secured to the surface of the support structure.
  • the position and distance of the image capturing means affects the measuring range and image capturing sensitivity level.
  • the increase of the distance of the image capturing means from the surface of which the light is reflected results to poor sensitivity but higher measuring range.
  • the decrease of the distance of the image capturing means from the surface of which the light is reflected results to higher sensitivity but lower measuring range.
  • FIG. 1 provides an exemplary architecture of the system in accordance with an embodiment of the present invention
  • FIG. 2A and FIG 2B illustrate the system without and with a reflector respectively; in accordance with an embodiment of the present invention
  • FIG. 2C illustrates the detailed implementation of the system without a reflector
  • FIG. 2D illustrate the detailed implementation with a reflector in accordance with the present invention
  • FIG. 3A shows a diagram to describe the sensitivity variability the arrangement of the components in accordance with an embodiment of the present invention
  • FIG. 3B illustrates an arrangement with the reflector in accordance with an embodiment of the present invention
  • FIG. 4 shows a another diagram on the arrangement of the components in accordance with an embodiment of the present invention.
  • FIG. 5 shows a flowchart of the process involved for the system in accordance with an embodiment of the present invention.
  • the present invention provides a system and method adapted for providing reliable real-time data and information for assessing the health condition of a building or a structure.
  • the system enables information associated to at least one measurement parameter to be attainable in real-time to users for use in assessing the health condition of the building or structure.
  • the information which can be attainable includes; but not limiting to; current relative vibrations; and current relative settlements.
  • the system 100 for assessing the health condition of a building or structure as illustrated in FIG. 1 in accordance with an embodiment of the present invention comprises at least one light emitting means 101, at least one image capturing means 102 and a processor 103 (not shown).
  • the system 100 of the present invention can be mounted on any surface of the building or elevated structure; for example on a surface of a support structure of the building or the elevated structure.
  • the light emitting means 101 is generally a light source, accordingly adapted for emitting light or generate light which is amplified at a predetermined wavelength; and in collimated form; that is not spread out in many or different directions.
  • the light is emitted at a wavelength within a range that can create a laser-like emission.
  • the light emitting means 101 is secured to at least one surface of the building, in a manner such that the emission can be directed towards and thereby reflected on another surface; for example on a surface adjacent to that of which it is being secured to.
  • the light emitting means 101 is removably mounted at a convenient point or position relative to the image capturing means 102 such that this facility can be achieved.
  • the light is reflected on the surface of which the image capturing means 102 is mounted.
  • the image capturing means 102 is generally enabled for successive motion captures; for example; to capture image(s) of a subject continuously at a certain speed or burst mode.
  • the present invention is adapted to capture continuous images of the reflected light emission from the light emitting means 101. It is positioned adjacent to the surface of which the light is reflected, whereby in one exemplary attachment, it is detachably secured to a surface adjacent to that of the light emitting means 101 ; and at a distance from the surface of which the light is being reflected, with suitable fastening means. It may be mounted to a surface opposing to that of the light emitting means 101. Suitably, the position and distance of the image capturing means 102 from the surface of which the light is being reflected, affects its sensitivity and measuring range.
  • the image capturing means 102 can be positioned hence secured at various angles and distances away from the reflected surface, at which said inclinations or variance of angles and distances translates the sensitivity of the system 100.
  • the image capturing means 102 may include a holding arm 112 adapted for holding the image capturing means 102 at one end; and to be secured to a surface of the building at another end. It is anticipated that the image capturing means 102 may be secured to at least one surface of the building with suitable a carrier; holder; bracket; housing or the likes.
  • the holding arm 112 in accordance with the embodiments of the present invention plays a significant role in the aspects of image capturing sensitivity and measuring range.
  • the holding arm 112 may be extendable hence allowing the variance of distance.
  • the distance of the image capturing means 102 from on which the light emission is reflected is dependent on the length of the holding arm 102 being extended from the reflected surface.
  • reducing the distance will increase the sensitivity level and providing a smaller measurable range; whilst increasing the distance results to lower sensitivity level and bigger measurable range.
  • the holding arm 102 can be formed generally resembling an L-shape member, having one end adapted for accommodating, hence mounting the image capturing means 102.
  • the holding arm 112 is constructed from anyone of; a metal based material, a composite material, or any material that can be shaped and adapted into the holding arm 112.
  • holding arm 112 may be replaced with other suitable implementations or devices to achieve the effects of sensitivity and measuring range as described herein.
  • the image capturing means 102 is secured onto a support structure of the building; i.e. a pillar. With the holding arm 112, the distance of the image capturing means 102 from the surface of the building can be adjusted.
  • the holding arm 112 may be formed to be readily extendable i.e. with telescopic extension; so as to provide adjustable distance from the surface of the building.
  • the processor 103 maybe coupled and connected to the image capturing means 102 such that the image capturing means 102 communicates all data including images to the processor 103 for further processing.
  • the processor 103 is configured to generate information associated to the health condition; status or suggestions of the building based on the continuous images of the light emission captured by the image capturing means 102.
  • the processor 103 retrieves or receives data related to at least one type of parameter or anomaly that can be used to generate the current relative settlement and the past relative settlement of the building or structure.
  • the system 100 of the present invention tracks or monitors the movements of the light emitted by capturing continuous images of the reflected light emission for a predetermined period of time.
  • the building relative vibrations information and differential settlements can be derived.
  • the current building relative vibrations information includes vibration amplitudes; frequencies and time constants.
  • the processor 103 is further configured to retrieve and store information related to past/historical building relative vibration amplitudes and frequencies. It should be noted that the processor 103 is configured to calculate or generate the desired output based on standard and/or predetermined algorithms. [0042] Using the vibrations amplitudes; frequencies and time constants data; information; the processor 103 can generate an output associated to the health condition; status and suggestions of the building or structure being monitored.
  • the building relative vibration amplitude increases and/or relative vibration frequency reduces and/or relative vibration time constant reduces; such occurrence suggests that the building may be experiencing at least one of the following conditions: cracks developed in the structure; foundation of the building is deteriorating; and/or the soil around the foundation has eroded.
  • the damaged or deterioration of any part of the building or structure can be derived by comparing the relative vibration amplitude, relative vibration frequency, relative vibration time constant and differential settlement between different support structure such as pillars; on each level of the building.
  • the system may further include a reflector 104.
  • the reflector 104 is adapted to reflect the light emission from the light emitting means 101 ; whereby it is positioned at an angle of 45 degrees relative to the surface of the building.
  • the reflector 104 eliminates the probability of the light emission to move laterally away; whereby the reflector 104 is adapted to diverge the reflected light vertically when the light source moves laterally away from the image capturing means 102; gradually to a distance that could affect the accuracy in tracking the light emission; and may reduce the sensitivity of the image capturing means 102 in detecting and/or tracking the light emission. Still referring to FIG.
  • the sensitivity and measuring range in detecting vibration of the building using the system 100 can be improved or heightened by varying the distance of the image capturing means 102 from the area or surface of which the light is being reflected and/or the inclination angle of the image capturing means 102 relative to the surface of which the light is being reflected on.
  • Sensitivity for the purpose of the present invention varies with the distance between the image capturing means and the reflected wall. The sensitivity drops when the image capturing means 102 is positioned further from the reflected light. Nevertheless, the larger the length of the image capturing means 102 from the surface; the larger/wider the measuring range.
  • the image capturing means 102 may be secured at a distance of 0 mm to 1000 mm from the surface of the support structure of the building on which the light is being reflected; as illustrated in FIG. 3A; to provide a varying sensitivity level and range in measurement.
  • FIG. 3A illustrates an embodiment of the present invention; particularly in securing the image capturing means 102 to a support structure of the building; a pillar 113; without the presence of the reflector 104.
  • the illustrated arrangement includes the holding arm 112 formed with a predetermined length; hence providing space of a predetermined distance (j) for the image capturing means 102 from the surface of the pillar 113.
  • the light emission or light wave may be emitted and hence reflected at a distance detectable by the image capturing means 102; whereby the light is emitted in a direction parallel to the holding arm 112. It should be noted that light emission may not be in a direction parallel to the holding arm 112, it is anticipated that the light can be emitted in varying inclination angles.
  • the image capturing means 102 is accordingly secured to the holding arm 112 in a manner such that it is able to detect and capture images of the reflected light. As discussed in the preceding paragraphs, reducing the distance of the image capturing means 102 from the surface of which the light is reflected on, will increase the sensitivity level; whilst providing a smaller measurable range due to increased distance results to lower sensitivity level and bigger measurable range.
  • the holding arm 112 may be secured at an inclined angle, thereby providing angle of inclination for the image capturing means 102.
  • the horizontal angle ( ⁇ ) is measured from a lateral surface of the holding arm 112 to the surface of the pillar 113.
  • the vertical angle ( ⁇ ) is measured from a top surface of the holding arm 112 to the surface of the pillar 113.
  • the angles for both horizontal and vertical inclinations vary from 0 to 180 degrees, enabling varying detection sensitivity level; measurable range and spatial requirements.
  • the reflector 104 In an arrangement that includes the reflector 104, it is mounted at a point on the surface of the support structure of the building such that the light emission image projected will not experience shrinkage due to the prospective effect typically experienced with image capturing devices; whereby the image of the object is smaller when the object moves away from the image capturing device.
  • the reflector 104 is mounted at a 45 degrees angle from the surface of the support structure of the building.
  • a main control system that is communication with the system 100; the communication may be carried out wirelessly or via wired network.
  • the main control system may be configured to supply and regulate power to operate the system 100.
  • Instructions may be sent in the form of signals or commands to act as required; for instance to perform various tasks; including but not limiting to; continuous real-time monitoring; capture images; tracking the light emission and processing the images. Absence of any command denotes that the systems is in OFF or SLEEP condition so as to reduce power consumption.
  • the commands may be sent to a wireless transceiver (not shown) that is configured to send signals across the components of the system 100.
  • the main control system sends commands and receives signals to and from system 100.
  • system 100 is secured to the supporting structure of the building, i.e. pillars or structures of the likes. It should be noted that the system 100 can be secured to any surface of the building; such that the system 100 can achieve the intended results within the scope of present invention.
  • the image capturing means 102 is secured to at least one supporting structure of the building; i.e. Pillar A.
  • the light emitting means 101 is secured to another pillar adjacent to Pillar A; labelled in FIG. 4 as Pillar B. It should further be noted that the exact position of the image capturing means 102 or the light emitting means 101 may differ from one implementation to another to suit the different types of structures or surfaces that they are secured to; and to allow the tracking of the reflected light being emitted from the light emitting means 101.
  • the light emitted from the light emitting means 101 is generated as a parallel or collimated beam and is directed towards the location of the pillar where the image capturing means 102 is mounted. The beam is reflected on the surface of the Pillar B.
  • the image capturing means 102 is triggered to continuously capture images of the reflected light emission to detect any vibration and/or movements that may be experienced by the light emission.
  • Captured images may be communicated to the processor 103 during or after the images are being captured further processing to generate an output that includes the health condition or status of the respective building.
  • FIG. 5 A system incorporating the process of the present invention will now be described with reference to the schematic flowcharts generalizing the entire operation in accordance with an embodiment of the present invention shown as FIG. 5. The flow to be elucidated herein is intended to describe the general principles of the present invention, hence not intended to limit the scope of protection.
  • the light emitting means 101 is mounted on a surface of a support structure of the building; for example a pillar; while the image capturing means 102 is mounted on another pillar that is adjacent to the first pillar of which the light emitting means 101 is being mounted.
  • a command may be sent to trigger the light emitting means 101 to emit collimated light towards another surface of the building; for instance the surface of which the image capturing means 102 is mounted at via the holding arm 112, 501. Then at 502, the light is reflected on the surface adjacent to the image capturing means 102 is mounted. Next at 503; another command is sent to the image capturing means 102 such that continuous images of the reflected light are captured at 503. The captured images are then fed to the processor 103 for further processing and assessment at 504. The processor 103 proceeds to extract and derive data relevant to the current and historical building relative vibration amplitudes, frequencies and time constants and perform a comparison between the data at 505. A differential settlement may be obtained during this process. An output that contains the health status or integrity status of the building is generated at 506.
  • users will be able to perform an assessment based on received data and information from the system and then generate an output based on the assessment; which is related to the current health status of the building or structure in a real-time manner.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Measuring And Recording Apparatus For Diagnosis (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

L'invention concerne un système d'évaluation en temps réel et de communication d'un état de santé d'une structure ou d'un bâtiment. Le système comprend : un moyen d'émission de lumière (101) monté sur une surface d'un bâtiment et adapté pour émettre une lumière collimatée vers et réfléchie sur une autre surface du bâtiment ; un moyen de capture d'images (102) positionné à côté de la surface dont la lumière est réfléchie ; et un processeur (103) conçu pour évaluer les images provenant du moyen de capture d'images (102). Les vibrations et les tassements différentiels associés au bâtiment sont évalués à l'aide des images capturées de la lumière réfléchie. Un état de santé du bâtiment est généré sur la base de l'évaluation, notamment d'une prédiction de l'état de santé actuel sur la base des résultats de l'évaluation. Dans un mode de réalisation, le système comprend en outre un réflecteur (104) et un support (112) conçu pour supporter le moyen de capture d'images (102) à une distance prédéterminée de la surface dont la lumière est réfléchie.
PCT/MY2016/000070 2015-10-26 2016-10-20 Système et procédé d'évaluation de la santé d'une structure ou d'un bâtiment WO2017074173A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
MYPI2015703850 2015-10-26
MYPI2015703850 2015-10-26

Publications (2)

Publication Number Publication Date
WO2017074173A2 true WO2017074173A2 (fr) 2017-05-04
WO2017074173A3 WO2017074173A3 (fr) 2017-06-08

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PCT/MY2016/000070 WO2017074173A2 (fr) 2015-10-26 2016-10-20 Système et procédé d'évaluation de la santé d'une structure ou d'un bâtiment

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4480480A (en) * 1981-05-18 1984-11-06 Scott Science & Technology, Inc. System for assessing the integrity of structural systems
US8131008B2 (en) * 2007-01-31 2012-03-06 Building Component Verification Systems, Inc. Methods, apparatuses, and systems for image-based measurement and inspection of pre-engineered structural components
US8423300B1 (en) * 2010-05-10 2013-04-16 The Steel Network, Inc. Method and system for monitoring the structural integrity of structural members of a building
US9442002B2 (en) * 2013-01-29 2016-09-13 Spectral Sciences, Inc. Remote optical sensing of the integrity of a structure using reflected or scattered light
EP2973393A4 (fr) * 2013-03-14 2016-11-30 Essess Inc Procédés et systèmes d'analyse structurelle

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