In an example, a system includes a plurality of acoustically coupled nodes. Each of the nodes includes a transducer, a communication circuit and a controller. The transducer is adapted to be mechanically coupled to a medium. The communication circuit is coupled to the transducer to send and receive acoustic signals via the medium according to at least one communication parameter. The controller is to adaptively configure the at least one communication parameter of the communication circuit based on an acoustic signal received from at least one other of the nodes.

A method of monitoring the health of an aircraft propeller whilst the propeller is in operation, the propeller having a plurality of blades extending radially outwardly from hub arms of a propeller hub, which in turn extend radially outwardly from a central axis extending through the propeller and a propeller drive shaft, is provided. The method comprises obtaining measurements representative of the strain in each of at least some of the hub arms using strain sensors, each of the strain sensors being provided on a respective hub arm. A corresponding propeller health monitoring system, an aircraft propeller comprising the system and an aircraft comprising the propeller are also provided.

Provided are a three-dimensional display device, a three-dimensional display method, and a program capable of notifying a user of an event having a causal relationship with a damage. The three-dimensional display device (10) includes a memory (16) that stores a three-dimensional model of a structure, a damage displayed in the three-dimensional model, and an event that has a causal relationship with the damage; a display unit (26); and a processor (20). In the three-dimensional display device (10), the processor (20) causes the display unit (26) to display the three-dimensional model, superimpose the damage on the three-dimensional model and display the damage, and display the event having the causal relationship with the damage.

In a material testing machine including a load actuator including a shaft configured to make a linear motion, and configured to apply a load to a test piece through the linear motion of the shaft, the load actuator includes a bearing configured to support the shaft, and the bearing serves as an air bearing.

A structure state display system has a measurement means, disposed in a structure, for measuring a physical state relating to the structure, an acquisition means for acquiring measurement information measured with the measurement means, and a creation means for applying a virtual physical quantity according to the measurement information to a design model including the structure and creating a virtual model in which a display showing the physical state of the structure in the design model is changed, and the virtual model is displayed on display means.

Based on a defective state of a structure, a degree of soundness that indicates how much the structure is sound is determined. Information about a defective state of the structure that provides grounds for this determination is outputted.

An apparatus for predicting a degree of deformation of a battery module, caused by swelling of a secondary battery. The battery module includes at least one secondary battery in a module case. The apparatus includes a cell evaluation module configured to derive a relationship between a thickness change amount and a reaction force for a single secondary battery; a case evaluation module configured to derive a relationship between a load applied to the module case and a width change amount of the module case; and a prediction module configured to predict a deformation amount of the battery module by using the relationship between the thickness change amount and the reaction force of the secondary battery, derived by the cell evaluation module, and the relationship between the load and the width change amount of the module case, derived by the case evaluation module.

An inventive approach is disclosed to integrate Digital Image Correlation (DIC) with the Acoustic Emission method that may be used for structural health monitoring and assessment of critical structural components in civil, mechanical, and aerospace industries. The inventive approach relies on passively recording acoustic emission across the specimen being tested and activating the DIC cameras automatically to measure deformation on the specimen's surface. The resulting acousto-optic system can be used to determine damage initiation, progressive damage development, identify critical regions and make lifetime predictions of the tested specimen.

In one embodiment, a system and method for determining a natural frequency of a structure involve modeling the structure, creating a synthesized excitation comprising a plurality of waves having various frequencies within a defined range of frequencies, applying the synthesized excitation to a base of the modeled structure, and generating response data indicative of a natural frequency of the modeled structure that is based upon the application of the synthesized excitation.

The damage assessment device 16 includes a trolley 4 with a platform 43 carrying a sensor mounting 11 for various non-destructive testing sensors 10 and an additional depth sensor 13 for estimating the depth of a dent, a flexible and partially ferromagnetic rails 2 in order to keep the trolley 4 on the surface of an aircraft structure and allowing the trolley 4 to move perpendicular to a linear scanning axis, formed by the bridge 41 of the trolley 4, and the possibility for remote-control the device via an external control station 14.