Modern structures on aircraft make increasing use of large-scale composite structures. Quantitative damage monitoring for composites, including occurrence, number, localization, and size estimation, will help reduce maintenance costs, improve fleet management efficiency through condition-based maintenance, potentially more rapidly enable new material systems structural concepts by integrating health into the design itself. With advantage easily interpretable, intuitive, accurate imaging...

In applications that demand single-input dual-output (SIDO) or dual-input single-output (DISO) dc-dc converters, employing two separate (SISO) converters is a solution. However, the number of components doubled, resulting in high overall cost. order to reduce costs, this paper proposes novel topology synthesis methodology, with which variety SIDO and DISO reduced can be derived. The principle states integrated easily developed from conventional SISO by replacing diode basic cell inclusive...

Single-inductor multi-input multi-output (SI-MIMO) dc-dc converters are attractive in the engineering applications due to advantage of high power density and low cost. In order explore as many possible SI-MIMO topologies, this article proposes a simple effective topology derivation principle that only requires three steps. First, basic cells consisting single inductor multiple sets unidirectional switches well inputs/outputs proposed. Second, integrate mentioned with branch typical...

Composite materials have been widely used in many industries due to their excellent mechanical properties. It is difficult analyze the integrity and durability of composite structures because own characteristics complexity load environments. Structural health monitoring (SHM) based on built-in sensor networks has evaluated as a method improve safety reliability reduce operational cost. With rapid development machine learning, large number learning algorithms applied disciplines, also are...

Knowledge of integrity in-service structures can greatly enhance their safety and reliability lower structural maintenance cost. Current practices limit the extent real-time knowledge that be obtained from during inspection, are labor-intensive thereby increase life-cycle costs. Utilization distributed sensors integrated with structure is a viable cost-effective means monitoring reducing inspection Acellent Technologies developing novel system for actively passively interrogating health...

By implementing a built-in sensor network on composite structure, crucial information regarding the condition, damage state, and service environment of structure can be obtained. In this study, methods for integrating piezoelectric networks into during different fabrication processes, including resin transfer molding (RTM) filament winding are examined. To integrate with contours structures, method to fabricate three-dimensional (3-D) diagnostic layer is developed. It demonstrated that large...

Thanks to the favorable advantage of low cost, integrated three-port dc-dc converters with reduced switches have attracted extensive attention. In order provide more new topologies, this paper aims propose a programmable topology derivation method, which effectively simplifies cumbersome process conventional combination method. Instead manual connection and examination, proposed alternative can quickly rigorously derive multiple viable topologies from great number possible connections aid...

Abstract Lamb wave-based damage detection is one of the most promising structural health monitoring (SHM) technologies for aircraft structures. In this paper, a deep transfer learning network developed multi-level classification plate-type A one-dimensional convolutional neural (1D-CNN) employed to deeply mine characteristics complex wave signals with multiple modes and boundary reflections. The concept carried out get different results engineers, multi-task cascaded 1D-CNN architecture...

Impact localization can provide accurate location information for rapid scanning and diagnosis of structural damage sufficiently improve the efficiency maintenance. The reference database method is commonly used to locate impact events, key which how match incoming events with correctly by reliable features valid metrics. However, complex reinforced ribbed structures in aerospace, stress wave generated strongly coupled structure, directly affects interferes feature construction similarity...

Debond detection is a critical technique to ensure composite structural safety. Although there are many novel sensors being developed in recent years, piezoelectric transducers (PZT) and fiber Bragg grating (FBG) have been shown as ideal for monitoring health. To utilize their merits overcome drawbacks hybrid PZT/FBG system has detect damage laminate plates. The diagnostic combines actuators which input controlled excitation the structure optic capture corresponding response. Tests carried...