Photographs and video recordings of vehicle crashes and accident sites are more prevalent than ever, with dash mounted cameras, surveillance footage, and personal cell phones now ubiquitous. The information contained in these pictures and video provide critical information to understanding how crashes occurred, and in analyzing physical evidence. This course teaches the theory and techniques for getting the most out of digital media, including correctly processing raw video and photographs, correcting for lens distortion, and using photogrammetric techniques to convert the information in digital media to usable scaled three-dimensional data.
This seminar is offered in China only and presented in Mandarin Chinese. The course materials are bilingual (English and Chinese). RTCA DO-178C is the worldwide accepted standard for civil aviation software development and certification. Compliance with the objectives of DO-178C is the primary means for meeting airworthiness requirements and obtaining approval of airborne software in TC/STC/TSO, etc. Even after learning the DO-178C, many people said they still lack of experience and still find it difficult to produce DO-178C compliant airborne software in real applications.
This seminar is offered in China only and presented in Mandarin Chinese. The course materials are bilingual (English and Chinese). With the development of Chinese civil aviation industry, more and more people realized the importance of airborne software. During the certification process of previous ARJ21 aircraft, airborne software had captured many concerns. Nowadays the certification process of C919 aircraft has also reached its peak after its maiden flight.
Using tolerance stacks ensures that parts fit together properly, reducing scrap and rework, thereby increasing value. This 2-day foundational-level course explains how to use tolerance stacks to analyze product designs and how to use geometric tolerances in stacks. You’ll learn the essential methods used for creating 1D part and assembly tolerance stacks, including these six critical concepts: 1. The importance of stacks 2. The two-column stack method using the SAE stack spreadsheet 3. Determining a stack path 4. Creating 1D part and assembly stacks 5. Interpreting GD&T 6.
RTCA DO-254/ED-80 “Design Assurance Guidance for Airborne Electronic Hardware” is a widely accepted industry standard to ensure safety in avionics hardware. FAA and EASA have recognized DO-254 as an acceptable means of compliance with the applicable airworthiness regulations for the electronic hardware. While microprocessor based complex hardware utilization in safety critical avionic hardware are increasing, and DO-254 compliance is mandated by the certification authorities, development of DO-254 compliant or safety certifiable hardware is becoming more and more important and provides competitive advantage in the industry. The avionics manufacturers need to correlate their existing processes and procedures with DO-254 in order to satisfy DO-254 objectives in their own quality management system structure, which may be challenging and tricky.
The production of a compressor map for turbocharged engine was important for turbocharger and engine design. After the production of the compressor map, the engine performance can be simulated and analyzed, and the powertrain design can be more reliable. Below showed was a procedure to obtain the compressor map (pressure ratio vs. mass flow rate) from scaling of the available compressor family with similar shape and design based on scaling theorem. In this paper, a compressor scaling model was established through a series of compressors. The non-dimensional compressor head coefficient vs. mass flow coefficient was modelled. According to the scaling law, such scaling model was universal for the similar family compressors with similar shape and design. As a result, the compressor pressure ratio and mass flow rate can be deducted from those non-dimensional parameters. After the compressor scaling model was established, a process to select the compressor for engine application was showed.
While weight savings along with high data transmission rates puts fiber optics in an obvious advantage over conventional copper cables, there is still some stigma in today’s aerospace and ground systems industry. In most cases, this hesitation has been justified by designers and installers fear of damaging “fragile” fiber optic cables, changing of transmission systems, and the cost, time and training associated with repairing downed fiber lines in the field. While all of these reasons are valid and there is still some areas where fiber optics might fall short of the familiar copper cable systems, there are several user-friendly methods and tools available today that can easily mitigate and prevent these occurrences while providing the system designers and users all of the rewards of fiber optics.
The endurance test described in NAS1675 section 4.6.7 option 1, more commonly known in the fastener industry as the “boomer banger test”, has been a commonly accepted test to examine the vibration endurance of fasteners since its approval in 1964. This paper seeks to provide a better understanding of the vibration characteristics of this test apparatus by using accelerometers attached directly to the test plate. Details from this test were analyzed for possible ambiguous setup factors which were not well defined in the specification. Those factors were then used to evaluate their effect on the test. The results from the evaluation indicates that the inherent variations are larger than what the setup factors could produce. The data obtained from the accelerometers shows the test to be closer to a repetitive shock test, with large variation in G-force measured by the accelerometers.
There exists a demand in the aerospace industry for highly configurable and flexible automated riveting cells to manufacture small to medium sized panels of complex geometries. To meet this demand Electroimpact has implemented a manufacturing system consisting of a stationary Electro-squeeze C-frame riveter, coupled with a robot part positioner to present the component to the process head tool point. The C-frame can install a wide range of aerospace rivets and perform specialist functions including backside countersinking operations, giving potential for double flush fastening. The geometric limitations and high implementation costs of large cartesian based positioning barges or fixed jig tooling and moving gantry riveters are avoided when exchanged for a robot part positioner.
Human-machine interaction (HMI) technologies enable the automation of various manufacturing and assembly applications while maintaining high flexibility. In this context, human-robot collaboration (HRC) capable robots should no longer function as autonomous systems, but much more as assistance systems or as colleagues for workers. In connection with shorter product life cycles, increasing variant diversity and individualization, the challenge arises to set up flexible robot systems, which can be reprogrammed and commissioned with little effort in a short period of time with preservation of the required accuracies. Therefore intelligent path planning is essential for development of flexible robot systems. In this paper different approaches are presented that allow the worker on the shop floor to rapidly and easily program a robot to implement new motion tasks based on a camera system without programming knowledge. Thereby various points are selected manually on an image.
Multi-arm robotic assembly in space is an increasingly popular research topic as robotic arms can be used to decrease repair costs. We propose a simulation framework to model different scenarios of multi-arm robotic assembly in space with an ever-changing harsh environment. Simulation is a valuable, viable, and low-cost option for testing the developed algorithms without the need to re-create the orbital conditions in an elaborate and expensive laboratory environment. The proposed simulation framework uses the open-source tools: ROS Kinetic and Gazebo 7. We propose a system where robotic arms coordinate and collaborate to drive a screw into a plate autonomously. A move-able robot with a 3D sensing camera maps the environment and, using image recognition and localization, notifies the arms of obstacles and the locations of the screw and plate models. The arms calculate a collision-free path to the model, grasp the object, and return to a shared location.
There is a recurring need for automatic Information Retrieval (IR) from quality documents, price tags, part markings, receipts, purchase orders and technical manuals - which are otherwise non-parsable. IR coupled with search functionalities has a wide range of applications from warehouses, shop floors, marketplaces to even cockpits in the aviation sector. It helps in semi-automating workflows like document reviews, quality checks, collaborative Q&As and contextual extraction of information. These workflows make laborious tasks more intuitive and easier, thereby reducing the workload of the engineers using them. The paper describes an AI based IR platform which caters to the aforesaid scenarios in a scalable manner and integrates seamlessly with similar problems across different domains.