This four-hour short course provides an introduction to fluids for aerospace hydraulic systems. Topics covered include an introduction to basics fluid properties, rheology, tribology, and fluid product development. In addition, the history and performance of different classes of fluids are discussed in detail, and specific failure modes such as erosion and sludge formation will be described. Along with an introduction to fluid degradation, information on used oil analysis test methods and interpretation will be provided.
This paper aims to the development of nanotechnology-based applications for new intelligent aircraft and for increasing the intelligence of actual ones. It is intended to answer the above needs by a new smart aircraft concept, which take advantage of distributed nanotech sensors on structural and aerodynamic components. The distributed sensing system acquires the largest possible amount of data about aerodynamics and structural behaviour with a null impact on aircraft. Two different and complementary applications that make use of the same components are expected: On new aircraft, it is possible to use two different families of sensors: superficial printed pressure sensors and painted strain and displacement sensors on external surfaces and embedded strain sensors in structural composite elements. On existing aircraft, it is possible to use only printed sensors: superficial printed pressure strain and displacement sensors on external surfaces and critical structural components.
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.
Gluing is an essential fastening step in the field of aircraft assembly except for riveting and bolting. Generally, the robotic programs of gluing are generated in CAM environment. Due to the positioning errors and deformation of the workpiece to be glued in the fixture, the nominal pose and the actual pose of the workpiece are no longer consistent with each other. The Robot trajectory of dispensing glue are adjusted manually according to the actual pose of the workpiece by robot teaching. In this paper, an on-line gluing path correction method is developed by 2D laser profile measurement. A pose calibration method for 2D laser profiler integrated into a gluing robot by measuring a fixed center point of a standard ball is proposed to identify the position and orientation of the laser sensor, which enables the accurate transforming coordinates between the robot frame and the sensor frame. Meanwhile, the pose of the gluing tool mounted on the end of the robot is calibrated.
Threaded, potted inserts are commonly used as a standard connecting element for sandwich components, which are used for aircraft interior. Since they often offer the only detachable connection, they are used in very high quantities. To ensure a material bond between the inserts and the honeycomb structure, the joint is filled with adhesive. Despite the high number of inserts, this process is performed manually. Recent research has shown approaches for automated gripping and placement of the inserts by an industrial robot and yields high potential for cost savings and increased productivity. The automated adhesive insertion, so called potting, has not been considered so far, but is an essential contribution to the full automation of the entire process chain. The amount of adhesive varies depending on the type of insert and its position on the honeycomb structure.