Abstract
Structural health monitoring (SHM) techniques, which are also considered as online nondestructive testing methods, are significant in modern structural engineering due to their ability to guarantee structure safety while reducing maintenance cost. It is often necessary to combine different SHM methods to achieve a more reliable damage detection result. However, the hardware of the SHM systems is usually expensive, bulky, and heavy when they are designed separately. Therefore, this paper proposes a three-layer architecture for designing an integrated multi-function SHM system to achieve a small, lightweight, and low power consumption SHM system. Based on the architecture, an integrated SHM system with impact monitoring and electromechanical impedance measurement is developed. In addition, a scheduling module is developed to manage the two functions of the system. Furthermore, an integrated interface is developed to transfer the data and the command. Then, an integrated printed circuit board is designed and manufactured to achieve the aforementioned functions. The designed system is applied for impact monitoring and damage detection for a supporting structure of a sailplane.
Highlights
With the benefits associated with enhancing safety and reducing maintenance costs, structural health monitoring (SHM) has become an increasingly important topic, especially in the aerospace industry
Unlike conventional nondestructive testing techniques, structural health monitoring refers to the process of continuously monitoring the current state of a structure and measuring damage-sensitive data from the sensors that are typically permanently installed on the structure
SHM methods can be divided into two categories: the passive method, where sensors are designed to collect data only, and the active method, where the piezoelectric transducer (PZT) sensors generate vibration or emit stress waves [7]
Summary
With the benefits associated with enhancing safety and reducing maintenance costs, structural health monitoring (SHM) has become an increasingly important topic, especially in the aerospace industry. An and Sohn [29] designed a system, called the integrated impedance and guided wave (IIG) system, which combines EMI-based and GW-based methods through a baseline-based damage indicator for damage detection They proposed a circuit design for the IIG system where a wave generator, a multiplexer (MUX), and a digitizer are involved. This article proposes a framework for designing an integrated multi-function SHM system, especially in the management of hardware and software interface, as well as scheduling different damage detection methods. A so-called “scheduling module” part, which is formed by several MUXs, is utilized to schedule the commands to the PZT sensors and transfer their signals to different preprocessing units according to the needs This is the core idea of integrating these two functions mentioned in one PCB.
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