Development Of A Self Sufficient Wireless Sensor Node Using The Outer Fml Layer As An Antenna
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Development of a Self-Sufficient, Wireless Sensor Node Using the Outer FML Layer as an Antenna
This book presents an investigation on integrating wireless sensor nodes including their antennas into fiber metal laminates (FMLs) for the purpose of enabling wireless, material-integrated structural health monitoring. Within the scope of this work, a digital sensor node is presented, which can be fully integrated into a conductive host material. A stainless steel antenna supplies the system with sufficient power to provide the functions required for its intended use. This system enables the wireless readout of sensor data for the detection of damage in FMLs. The application focuses on aerospace components, for the detection of damage in the inner material layers, which are not or only hardly detectable by optical inspection methods. Guided ultrasonic waves in the form of Lamb waves are used for this. The flexible electronics are inserted into the layers of the target material, while the associated antenna is cut into the outer metal layer. This turns the outer metal layer, which would prevent wireless communication from inside the laminate, into an advantage, as the need for an additional, external antenna is eliminated. Two fundamentally different principles can be used as the sensor element. Piezoelectric sensors were already used extensively in structural health monitoring using ultrasound and recently developed piezoresistive sensors, which are designed to be very small, making them highly suitable for material integration. Both types of sensors can be read out with the presented system so that the most appropriate approach can be chosen depending on the application. The suitability of the wireless sensor system for its intended purpose is verified by material-integrated measurements. At the end of this work, it is shown that the raw data of the measurements reproducibly provide a sufficient resolution of the sensor signal to manually identify changes caused by applied reversible, artificial pseudo-defects from reference measurements without any damage. The intended audience of this book are people from the field which are familiar with the basic concepts of electrical engineering or similar regions, embedded system enthusiasts and all readers who like to follow the process of a complete wireless electronic system design from requirements analysis to final material-integrated measurement demonstrations.
Functional Compliance of Multifunctional Bondlines with Disbond Arrest and Health Monitoring Features for Safe and Efficient Composite Joints
Safe and efficient joints are key for improving the structural efficiency of composite aircraft. Therefore, this thesis investigates the potential of multifunctional bondlines, combining structural bonding, disbond arrest features, and structural health monitoring. The central research question is how to achieve a functionally compliant design. This means ensuring disturbances between these functions do not eliminate their benefits regarding the objective of safe and efficient joints. The approach is adding discrete multifunctional disbond arrest features, functionally integrating disbond arrest and sensor functions, to epoxy bondlines. Experimental results indicate some major challenges such as a stiffness conflict for the integrated functions. Nevertheless, securing the epoxy bondline without disturbing its static strength proves successful in the end. In addition, the thesis provides some new insights regarding the functional compliance concept. For example, it strongly suggests considering temporal aspects, such as transient material properties.
Absolutely Smashing It
***Unmissable, hilarious and kind, this is the first novel from Kathryn Wallace, who blogs as I Know, I Need to Stop Talking*** "SAM! AVA! Get downstairs, NOW. Have you done your TEETH? HAIR? SHOES? Come on, come on, come on, we're going to be bastarding late again. No, I haven't seen Lego Optimus Prime, and nor do I give a shit about his whereabouts. Sam, will you stop winding your sister up and take this model of the Shard that I painstakingly sat up and created for you last night so that I wouldn't be in trouble with your teacher. I mean, so that you wouldn't be in trouble with your teacher. No, it doesn't smell of 'dirty wine'. Well, maybe it does a little bit. Look, Sam, I haven't got time to argue. Just hold your nose and get in the car, okay? AVA! TEETH! HAIR! SHOES!" Gemma is only just holding it together - she's a single parent, she's turning 40 and her seven-year-old daughter has drawn a cruelly accurate picture which locates Gemma's boobs somewhere around her knees. So when her new next-door neighbour, Becky, suggests that Gemma should start dating again, it takes a lot of self-control not to laugh in her face. But Becky is very persuasive and before long Gemma finds herself juggling a full-time job, the increasingly insane demands of the school mums' Facebook group and the tricky etiquette of a new dating world. Not only that, but Gemma has to manage her attraction to her daughter's teacher, Tom, who has swapped his life in the City for teaching thirty six to seven year olds spelling, grammar, basic fractions - and why it's not ok to call your classmate a stinky poo-bum... It's going to be a long year - and one in which Gemma and Becky will learn a really crucial lesson: that in the end, being a good parent is just about being good enough. Readers love this hilarious, fast paced slice of family life: ***** Utterly hysterical - NetGalley Reader ***** Brilliant... Funny, touching and modern... just amazing - NetGalley Reader ***** I have been a mum at the school gates and the observations in this book are spot on. I shall be recommending it to all the school mums I know - NetGalley Reader **** A perfect read to snort with laughter over whilst lying in a bath with a glass of bubbles (if you can get the kids to stay out of the bathroom for long enough)! - NetGalley Reader **** Kathryn Wallace has Absolutely Smashed It with this novel. I loved it and couldn't put it down... had me properly laughing out loud several times - NetGalley Reader **** This will make you giggle about life as a parent where we are all spinning plates of different sizes and at different speeds. I would recommend wholeheartedly to fellow friends who are also spinning their own plates! - NetGalley Reader ***** A hilariously, honest, open, recognisable and highly relatable story - NetGalley Reader ***** A light hearted but honest look at mummies, yummy mummies and can't quite manage everything mummies - NetGalley Reader