Taguchi based Design of Sequential Convolution Neural Network for Classification of Defective Fasteners

Fasteners play a critical role in securing various parts of machinery. Deformations such as dents, cracks, and scratches on the surface of fasteners are caused by material properties and incorrect handling of equipment during production processes. As a result, quality control is required to ensure safe and reliable operations. The existing defect inspection method relies on manual examination, which consumes a significant amount of time, money, and other resources; also, accuracy cannot be guaranteed due to human error. Automatic defect detection systems have proven impactful over the manual inspection technique for defect analysis. However, computational techniques such as convolutional neural networks (CNN) and deep learning-based approaches are evolutionary methods. By carefully selecting the design parameter values, the full potential of CNN can be realised. Using Taguchi-based design of experiments and analysis, an attempt has been made to develop a robust automatic system in this study. The dataset used to train the system has been created manually for M14 size nuts having two labeled classes: Defective and Non-defective. There are a total of 264 images in the dataset. The proposed sequential CNN comes up with a 96.3% validation accuracy, 0.277 validation loss at 0.001 learning rate.Comment: 13 pages, 6 figure

NDE: An effective approach to improved reliability and safety. A technology survey

Technical abstracts are presented for about 100 significant documents relating to nondestructive testing of aircraft structures or related structural testing and the reliability of the more commonly used evaluation methods. Particular attention is directed toward acoustic emission; liquid penetrant; magnetic particle; ultrasonics; eddy current; and radiography. The introduction of the report includes an overview of the state-of-the-art represented in the documents that have been abstracted

Industrial Segment Anything -- a Case Study in Aircraft Manufacturing, Intralogistics, Maintenance, Repair, and Overhaul

Deploying deep learning-based applications in specialized domains like the aircraft production industry typically suffers from the training data availability problem. Only a few datasets represent non-everyday objects, situations, and tasks. Recent advantages in research around Vision Foundation Models (VFM) opened a new area of tasks and models with high generalization capabilities in non-semantic and semantic predictions. As recently demonstrated by the Segment Anything Project, exploiting VFM's zero-shot capabilities is a promising direction in tackling the boundaries spanned by data, context, and sensor variety. Although, investigating its application within specific domains is subject to ongoing research. This paper contributes here by surveying applications of the SAM in aircraft production-specific use cases. We include manufacturing, intralogistics, as well as maintenance, repair, and overhaul processes, also representing a variety of other neighboring industrial domains. Besides presenting the various use cases, we further discuss the injection of domain knowledge

The 727 approach energy management system avionics specification (preliminary)

Hardware and software requirements for an Approach Energy Management System (AEMS) consisting of an airborne digital computer and cockpit displays are presented. The displays provide the pilot with a visual indication of when to manually operate the gear, flaps, and throttles during a delayed flap approach so as to reduce approach time, fuel consumption, and community noise. The AEMS is an independent system that does not interact with other navigation or control systems, and is compatible with manually flown or autopilot coupled approaches. Operational use of the AEMS requires a DME ground station colocated with the flight path reference

Voyager spacecraft. Volume VI - Operational support equipment Study report, phase IA

Operational ground support equipment for Voyager project, including data handling system, launch complex equipment, system test complex, and mission dependent equipmen

Візуальний огляд і ручні перевірки для визначення стану літака та його компонентів

Робота публікується згідно наказу ректора від 27.05.2021 р. №311/од "Про розміщення кваліфікаційних робіт вищої освіти в репозиторії НАУ". Керівник дипломної роботи: доцент кафедри авіоніки, Кожохіна Олена ВолодимирівнаUnder the influence of the growth of competition in the segment of aviation equipment, certain quantitative and qualitative changes in its production and restoration are constantly taking place. The degree of automation and computerization of the production process is constantly increasing due to the wider use of automatic lines, manipulators and installations, complex and high-precision equipment, and the introduction of regulation of technological processes with the help of computers. The importance of maintenance and repair processes to maintain the operational condition of aircraft is increasing, since its downtime due to a malfunction significantly worsens the economic indicators of operation. Aviation companies cannot underestimate the importance of aircraft maintenance. Regardless of the size of the aircraft, maintenance activities should be carried out regularly. These activities include aircraft inspection, restoration work, and aircraft repair. Different aircraft will require maintenance at different intervals. Safety is the highest priority for everyone involved in aviation. Over 80% (plus) of accidents are caused by human error. These human errors are not made on purpose. Many of these mistakes are made by the best and most conscientious employees. Thus, something had to interfere with the work and/or judgment of that "person" for the error to occur. Safety for everyone is the most obvious reason for airline service. Airplanes are made up of different parts and it's very complicated. Therefore, maintenance, repair, and overhaul/operation are critical to the safety of people and aircraft. Aircraft maintenance can extend the life of the aircraft. A comprehensive approach to maintenance minimizes maintenance time over the life of the aircraft. It provides an overview of the cycles required to create a robust aircraft maintenance program that ensures improved performance and benefits aircraft management. In order to take effective preventive measures, the aircraft must undergo various levels of inspection according to the aircraft maintenance schedule. Maintenance is performed after the aircraft has been inspected, after which it must be decided whether it needs condition-based monitoring or not. All these measures extend the life of the assets.Під впливом зростання конкуренції в сегменті авіаційної техніки, певні кількісні та якісні зміни в її виробництві та постійно ведеться реставрація. Ступінь автоматизації та комп'ютеризації виробничий процес постійно збільшується за рахунок більш широкого використання автоматичних ліній, маніпулятори та установки, складне і високоточне обладнання та ін впровадження регулювання технологічних процесів за допомогою ЕОМ. The важливість процесів технічного обслуговування та ремонту для підтримки працездатного стану літака збільшується, оскільки його простої через несправність значно погіршують економічні показники експлуатації. Авіаційні компанії не можуть недооцінювати важливість технічного обслуговування літаків. Незалежно від розміру повітряного судна, необхідно проводити технічне обслуговування регулярно. Ця діяльність включає перевірку літаків, реставраційні роботи та ремонт літаків. Різні літальні апарати вимагатимуть технічного обслуговування через різні проміжки часу. Безпека є найвищим пріоритетом для всіх, хто бере участь в авіації. Понад 80% (плюс). аварії спричинені людською помилкою. Ці людські помилки зроблені не навмисно. багато з цих помилок роблять найкращі та найсумлінніші працівники. Таким чином, щось повинно було втрутитися в роботу та/або судження цієї "людини" для помилки відбуваються. Безпека для всіх є найочевиднішою причиною обслуговування авіакомпанією. Літаки є складається з різних частин і дуже складний. Тому обслуговування, ремонт і капітальний ремонт/експлуатація мають вирішальне значення для безпеки людей і літаків. Технічне обслуговування літака може продовжити термін служби літака. Комплексний підхід до технічного обслуговування мінімізує час технічного обслуговування протягом усього терміну служби літака. Він забезпечує огляд циклів, необхідних для створення надійної програми технічного обслуговування літака, яка забезпечує покращену продуктивність і покращує управління літаком. Щоб прийняти ефективний профілактичних заходів, літак повинен пройти різні рівні перевірки відповідно до графік технічного обслуговування літака. Технічне обслуговування виконується після того, як повітряне судно було перероблено 10 перевіряється, після чого має бути вирішено, чи потребує воно моніторингу на основі стану або ні. Усі ці заходи продовжують термін служби активів

The SF6 Decomposition Mechanism: Background and Significance

Gas Insulated Switchgear (GIS) has been widely used in substations. The insulating medium used in GIS is sulfur hexafluoride (SF6) gas. However, the internal insulation defect existed in GIS would inevitably lead to partial discharge (PD), and cause the composition of SF6 to SOF2, SO2F2 and SO2 and other characteristic component gases. The decomposition phenomenon would greatly reduce the insulation performance of SF6 insulated equipment, and even paralyze the whole power supply system. In this chapter, we first discuss the objective existence, decomposition mechanism and harmness of insulation defects. Then the methods for insulation defects detection used to avoid the insulation accidents are introduced. Comparing all of the detection methods, diagnosing the insulation defect through analyzing the decomposed gases of SF6 by chemical gas sensors is the optimal method due to its advantages, such as high detection accuracy and stability, signifying the importance of developing chemical gas sensor used in SF6 insulated equipment. In conclusion, there kinds of gas sensor material, carbon nanotubes, graphene, are chosen as the gas sensing materials to build specific gas sensors for detecting each kind of SF6 decomposed gases, and then enhance the gas sensitivity and selectivity by material modification

The Second Joint NASA/FAA/DOD Conference on Aging Aircraft

The purpose of the Conference was to bring together world leaders in aviation safety research, aircraft design and manufacturing, fleet operation and aviation maintenance to disseminate information on current practices and advanced technologies that will assure the continued airworthiness of the aging aircraft in the military and commercial fleets. The Conference included reviews of current industry practices, assessments of future technology requirements, and status of aviation safety research. The Conference provided an opportunity for interactions among the key personnel in the research and technology development community, the original equipment manufacturers, commercial airline operators, military fleet operators, aviation maintenance, and aircraft certification and regulatory authorities. Conference participation was unrestricted and open to the international aviation community

Application of advanced technologies to small, short-haul aircraft

The results of a preliminary design study which investigates the use of selected advanced technologies to achieve low cost design for small (50-passenger), short haul (50 to 1000 mile) transports are reported. The largest single item in the cost of manufacturing an airplane of this type is labor. A careful examination of advanced technology to airframe structure was performed since one of the most labor-intensive parts of the airplane is structures. Also, preliminary investigation of advanced aerodynamics flight controls, ride control and gust load alleviation systems, aircraft systems and turbo-prop propulsion systems was performed. The most beneficial advanced technology examined was bonded aluminum primary structure. The use of this structure in large wing panels and body sections resulted in a greatly reduced number of parts and fasteners and therefore, labor hours. The resultant cost of assembled airplane structure was reduced by 40% and the total airplane manufacturing cost by 16% - a major cost reduction. With further development, test verification and optimization appreciable weight saving is also achievable. Other advanced technology items which showed significant gains are as follows: (1) advanced turboprop-reduced block fuel by 15.30% depending on range; (2) configuration revisions (vee-tail)-empennage cost reduction of 25%; (3) leading-edge flap addition-weight reduction of 2500 pounds