The invention relates to a method and an arrangement for managing and controlling the lifetime of a tree handling system of a forest machine. The tree handling system is activable through the impact of hydraulically powered execution means (7:1-7:n), the method comprises the steps of; obtaining sensor data (13:1-13:n) that represent a current loading (PT) on the tree handling system, determining a current partial damage value (SL, SM, SH), which is deemed to occur on the tree handling system at various loadings (PT) on the tree handling system,

A characteristic of the invention are the steps of; determining a key indicator (Ni:1-Ni:n), which describes a measured value (X) that relates to the operation of the tree handling system (1) and is representative of the risk of partial damage relative to specific reporting about a current running operating state (db:1-db:n) of the tree handling system, comparing at least the current partial damage value (SL, SM, SH) with a normative partial damage value (SLX, SMX, SHX) for a normative operating state (db:1X-db:nX) of the tree handling system corresponding to the key indicator (Ni:1-Ni:n) and determining a change that affects the measured value (X) of the key indicator (Ni:1-Ni:n) in such a manner that the current partial damage value (SL, SM, SH) returns to or approaches a level corresponding to the normative partial damage value (SLX, SMX, SHX) for the key indicator.

The present invention discloses a thermal fatigue crack generator for a large pipe. According to the present invention, the thermal fatigue crack generator for a large pipe precisely manages and controls the heating and cooling conditions for the large size test pipes having a diameter of 250 to 610 mm to significantly improve the reliability of the accuracy and a reproducibility of the thermal fatigue cycle so that a useful advantage is expected to ensure the reliability and the effectiveness of the skill verification of the non-destructive testing.

A structural health monitoring system comprises a first set of sensors operable for coupling to a structure positioned under ground, the first set of sensors further configured to detect an impact upon the structure while the first set of sensors is positioned under the ground; a second set of sensors operable to be positioned on or proximate to a surface of the ground, the second set of sensors further configured to detect an audible event occurring at a distance from the second set of sensors and the structure; and a computer readable memory storing one or more audio signatures that may correspond to the audible event.

A state estimation apparatus 1 includes an acquisition unit 2 that acquires deterioration information indicating a deterioration state of each structural object and a learning unit 3 that learns common information that is common between pieces of the deterioration information and estimation index information that is used for estimating a deterioration state of a target structural object, using the deterioration information as input.

A device for fatigue test includes a sample-laying part, a sample support, and a force-applying part. The sample-laying part is disposed on the sample support; and the force-applying part is disposed on the sample-laying part; the sample-laying part includes a substrate plate and at least two arms disposed on the substrate plate; the sample support includes a bed plate and at least four roller assemblies disposed on the bed plate; each roller assembly includes a roller, a roller support, and an adjusting bolt; the roller support is disposed on the bed plate; the roller is disposed on the roller support; the adjusting bolt is disposed between the roller and the roller support; and the sample support further includes at least one barrier, and both ends of the barrier are connected to two adjacent roller supports, respectively.

A method of retrieving a mobile platform from a tank at least partially filled with a non-conductive, energetic substance includes configuring the mobile platform to include at least a retrieval system including a buoyant body, an electrically conductive member, and a tether. The tether electrically isolates the buoyant body from the enclosure. The method further includes the steps of releasing the buoyant body to convey the tether toward a surface of the non-conductive, liquid energetic substance; conveying an electrically conductive cable to the electrically conductive member using the tether; electrically connecting a voltage neutralizing end of the electrically conductive cable to a voltage differential neutralizing body in a spark inhibiting ambient condition; electrically connecting a mobile platform end of the electrically conductive cable to the electrically conductive member of the mobile platform while the electrically conductive member is below the surface of the non-conductive, liquid energetic substance.

This method comprises: generating, only using the device, a low-frequency signal that makes the structure vibrate, generating a high-frequency signal in the structure, measuring a vibratory signal caused by the generated low-frequency and high-frequency signals at the same time then adaptively re-sampling these measurements to obtain a re-sampled vibratory signal the power spectrum of which comprises: a first frequency range [u.sub.BFmin; u.sub.BFmax] of width larger than 5 Hz that contains 95% of the power of the low-frequency signal, a second frequency range [u.sub.HFmin; u.sub.HFmax] of width systematically smaller than u.sub.BFmin that contains 95% of the power of the low-frequency signal, signaling a defect in the structure if an additional power lobe is detected outside of the ranges [u.sub.BFmin; u.sub.BFmax] and [u.sub.HFmin; u.sub.HFmax].

Systems and methods are disclosed for real time monitoring and recording of events related to the performance and structural integrity of composite panels used in structural components of a trailer and their effective use as an insulating material and structural panel. The systems and methods may include one or more sensors embedded and/or integrated in a composite wall of a vehicle such as a trailer, a gateway configured and coupled to the one or more sensors, and configured to wirelessly communicate information received from the one or more sensors to a server, further comprising software configured to receive, analyze, transmit and display information necessary for monitoring the integrity of the vehicle.

A system includes several load cells, each coupled to a lashing that secures shipping containers, accelerometer cells, each coupled to a shipping container at the top of a stack, and an inclinometer cell coupled to a cargo ship. The cells are configured to transmit data to a computer. All the cells comprise a processor programmed to acquire a time series of measurements and, preferably, decompose the time series into a sum of sinusoidal signals, each having a frequency and an amplitude. Alternatively, the computer can be programmed to decompose the time series. The computer is programmed to identify the signal components caused by the roll of the cargo ship or by resonances in shipping container stacks. The computer estimates cumulated damages caused by fatigue in the lashings and/or twist locks. The system is used to trigger alarms and/or schedule maintenance.

A reusable piezoelectric sensor for damage identification includes a piezoelectric ceramic plate and a metal box bonded to the surface of a test piece, where a wire through hole is formed in the center of a top plate of the metal box, and a side wall of the metal box extends vertically upwards to form a striking face for being struck to remove the metal box from the test piece; the piezoelectric ceramic plate arranged in the metal box is closely and fixedly bonded to a bottom plate of the metal box; and wires of the piezoelectric ceramic plate penetrate through the wire through hole to be connected to an external impedance analyzer. The reusable piezoelectric sensor for damage identification is easy to manufacture and convenient to operate and can effectively eliminate the testing error caused by the difference of the piezoelectric ceramic plate.