The invention relates to a method for determining the structural integrity of an infrastructural element, comprising the steps of: measuring deformations, such as displacements or rotations, during a predetermined time period with deformation measurement means arranged at or near a main structural body of the infrastructural element, in particular supports of the main structural body, characterized by determining the load configuration of the main structural body over the course of the predetermined time period, such as the load configuration concerning the loading perpendicular to a longitudinal direction of the main structural body, calculating the bending stiffness (EI) of the main structural body over the course of the predetermined time period, from the load configuration and deformations measured by the deformation measurement means, and comparing the bending stiffness (EI) at the end of the predetermined time period to the bending stiffness (EI) at the start of the predetermined time period to establish a difference in bending stiffness (EI) over the course of the predetermined time period.

The invention relates to a system for generating and collecting data with a view to determining the state of a structure (100). The system comprises a system (1) for acquiring vibration signals and a communication gateway system (2, 2′) configured to receive a signal (TL21, TL21rvl) from the gateway system (2, 2′), using a first protocol, and when the signal (TL21rvl) comprises a wake-up instruction, send the gateway system (2, 2′) an activity instruction request signal (TW12) using a second protocol, receive, from the gateway system (2, 2′), using the second protocol, an activity instruction signal (TW21) comprising an acquisition instruction, trigger a vibration signal acquisition operation and generate vibration data (Dvib) on the basis of the vibration signals acquired; and transmit, using the second protocol, the vibration data (Dvib) to the gateway system (2, 2′). The invention also relates to the acquisition system and to the corresponding gateway system, and to a corresponding method.

A system for assisting the maintenance of an aircraft is configured for implementing the following steps in an iterative manner determining a spectral power density of the position of a control surface over a time window; when the spectral power density corresponds to an amplitude of oscillations of the control surface upwardly crossing this predetermined threshold, storing an excess amplitude start time; and when the spectral power density corresponds to an amplitude of oscillations of the control surface downwardly crossing this predetermined threshold: determining a time interval between the excess amplitude start time and an excess amplitude end time, during which the amplitude of oscillations of the control surface has remained above the predetermined threshold; and determining an indicator representative of the energy corresponding to these oscillations during the time interval.

A measurement device and a measurement method capable of measuring a depth of a damage source in a structure having a thickness of a predetermined value or more. According to an embodiment, a measurement device includes a first detector and a signal processing device. The first detector selectively detects surface waves that are excited when first elastic waves generated inside a structure formed of a solid material have reached a surface of the structure. The information processing device obtains information about a depth of a source of the first elastic waves within the structure on the basis of information of at least one of an amplitude and a time of arrival of the surface waves detected by the first detector.

An integrated rapid infrastructure monitoring system for identifying defects in an underlying surface, comprising: at least one actuator; and, at least one impactor operatively connected to the actuator, wherein the actuator is configured to transition the integrated rapid infrastructure monitoring system from a first configuration with at least one of a motive force and an impact bounce force of the impactor, where the impactor is located on a first side of the integrated rapid infrastructure monitoring system, to a second configuration, where the impactor is located on a second side of the integrated rapid infrastructure monitoring system.

Disclosed is a system and method for testing a structure mode of vibration based on digital image recognition, which comprises a camera, targets, a bridge, a vertical acceleration sensor and a lateral acceleration sensor; the camera is arranged near the bridge head of the bridge; the bridge is equipped with a plurality of targets equidistantly inside guardrails on both sides; and the vertical acceleration sensor and the lateral acceleration sensor are fixedly arranged on the camera. The present application avoids the arrangement of a large number of sensors and complicated wiring in the bridge vibration detection, saves time and reduces economic cost, is convenient to operate, has relatively high precision, and has broad application prospects.

A plurality of strain values are received from a plurality of sensors permanently attached to an asset configured to carry a load. A strain profile of the asset is monitored based on the plurality of strain values. Additional information about the asset is received. A load rating factor is monitored based on the additional information and the strain profile. An equivalent accumulated damage factor is monitored based on the load rating factor. A remaining life prediction for the asset is calculated based on the strain profile and the equivalent accumulated damage factor.

According to one embodiment, a structure evaluation system according to an embodiment includes a plurality of sensors, a position locator, and an evaluator. The plurality of sensors detect elastic waves. The position locator locates positions of elastic wave sources by using the elastic waves among the plurality of elastic waves respectively detected by the plurality of sensors having an amplitude exceeding a threshold value determined according to positions of the sources of the plurality of elastic waves and the positions of the plurality of disposed sensors. The evaluator evaluates a deteriorated state of the structure on the basis of results of the position locating of the elastic wave sources which is performed by the position locator.

Systems and methods for monitoring eye health. The systems and methods monitor eye health by measuring scleral strain by way of an implantable monitor, a wearable monitor configured in eyeglasses, or an external monitor using a portable tablet computing device.

Certain embodiments of the strain monitor may be utilized to measure the strain on any surface to which it is attached, including, but not limited to, the skin of a patient or the surface of a structure such as a building or a bridge.

The objective of the present invention is to detect defects in a structure accurately in a non-contact manner. An optical path length converting unit (320) is disposed between a specimen being inspected and an image capturing element (310) in such a way as to cover part of a field of view of the image capturing element (310). An image analyzing unit (330) uses images captured by the image capturing element (310) to calculate amounts of displacement within the surface of the specimen, obtained using two fields of view of the image capturing element (310) not covered/covered by the optical path length converting unit (320). An out-of-plane displacement calculating unit (340) calculates an out-of-plane displacement of the specimen on the basis of the calculated amounts of displacement.