Cirrus Aircraft (United States)

Many of today’s most successful supply chains are ones that have executed a digitisation of information processes. Digital information unlocks game-changing experiences that we have recently grown accustomed to, such as two-day online delivery and order visibility. Digital transformation has quickly become a popular buzzword in supply chain management, a term that everyone understands as important for the future. Unfortunately, many struggle to get started with this concept, facing an immense resistance to change and a lack of leadership support. This paper compares and contrasts companies that are data-driven and those that are not, introduces the six stages of digital transformation and helps the reader to identify where their company currently is. It also provides a set of practical steps to get started in your organisation and discusses some roadblocks that you are likely to encounter. The paper will be especially impactful for those looking to drive digital change in their organisations by leading the effort to analyse, simplify and digitise legacy processes.

The Cirrus SF-50 is a single-engine, low-wing, seven-seat, very light jet aircraft that is currently in development. Like other Cirrus Aircraft, the SF-50 will be equipped with a whole aircraft-parachute recovery system: the Cirrus Aircraft Parachute System (CAPS). Since the jet is heavier and will fly faster than the existing SR-20 and SR-22 aircraft, an improved CAPS system is required. To aid development of the parachute system, a series of nine tests was conducted from Kingman, Arizona using modified SR-20 parachutes decelerating masses of between 1500 and 3600 lbs. Two tests characterized the unreefed inflation profile of the parachute, thereby providing a baseline against which to compare the effects of reefing. Five tests maintained a reefed state for a relatively long duration, to allow accurate determination of the reefed drag area ratio, and the final two tests tested the parachute and reefing system in a use-case equivalent to an aircraft recovery.

In this paper, the nonlinear friction characteristic of a custom made symmetrical linear hydraulic actuator is investigated using the Extended Kalman Filter (EKF). A new and very accurate characterization of friction is made by using a quadratic function of the piston velocity. Further to this proposed empirical friction model, the EKF is used to estimate the function coefficients. In this paper, an iterative approach is used to maintain system observability and render the estimation process more reliable. The study is conducted in simulation and by using measured experimental data. The estimated states and parameters by the EKF are found to be convergent to their known values in simulation and, further to experimental results, unique and repeatable. In addition, changes in the friction characteristics, which can occur in the physical system due to wear in the piston seals or degradation in the oil properties, are detected and accurately estimated by the EKF in simulation. This study presents an accurate nonlinear model for the representation of friction in a hydraulic actuator. It paves the way for the implementation of strategies for early fault detection in hydraulic systems.

Article The Quadratic Arc Computer Share on Author: M. J. Mendelson Northrup Aircraft, Inc. Northrup Aircraft, Inc.View Profile Authors Info & Claims ACM '52: Proceedings of the 1952 ACM national meeting (Pittsburgh)May 1952 Pages 53–59https://doi.org/10.1145/609784.609789Published:02 May 1952 0citation116DownloadsMetricsTotal Citations0Total Downloads116Last 12 Months1Last 6 weeks0 Get Citation AlertsNew Citation Alert added!This alert has been successfully added and will be sent to:You will be notified whenever a record that you have chosen has been cited.To manage your alert preferences, click on the button below.Manage my AlertsNew Citation Alert!Please log in to your account Save to BinderSave to BinderCreate a New BinderNameCancelCreateExport CitationPublisher SiteGet Access