Refine Your Search

Topic

Author

Affiliation

Search Results

Standard

Lighting Applications for Unmanned Aircraft Systems (UAS)

2019-12-05
CURRENT
ARP6336
The recommendations set forth in this document are to aid in the design of Unmanned Aircraft (UA) lighting for the size of aircraft and operation for which the aircraft is intended. ...This SAE Aerospace Recommended Practice (ARP) provides technical recommendations for the lighting applications for Unmanned Aircraft Systems (UAS). The technical content of this ARP discusses the unique trade-offs that are necessary to maintain commonality to the U.S.
Standard

Pilot Training Recommendations for Unmanned Aircraft Systems (UAS) Civil Operations

2010-11-04
CURRENT
ARP5707
This document provides an approach to the development of training topics for pilots of Unmanned Aircraft Systems (UAS) for use by operators, manufacturers, and regulators. The identification of training topics is based initially on Practical Test Standard (PTS) topics for manned aircraft pilots. ...The identification of training topics is based initially on Practical Test Standard (PTS) topics for manned aircraft pilots. The topics identified could be used for the construction of a PTS for UAS commercial pilot operations and a PTS for a UAS pilot instrument rating.
Journal Article

Prismatic Li-Ion Cell for Unmanned Aircraft

2008-11-11
2008-01-2894
Saft is working on advanced 28V Li-ion batteries for use in NAVY unmanned aircraft applications. This battery employs seven (7) prismatic state-of-the art Li-ion cells connected in series.
Standard

Aerospace - Vehicle Management Systems - Flight Control Design, Installation and Test of, Military Unmanned Aircraft, Specification Guide For

2012-12-19
CURRENT
ARP94910
This document establishes recommended practices for the specification of general performance, design, test, development, and quality assurance requirements for the flight control related functions of the Vehicle Management Systems (VMS) of military Unmanned Aircraft (UA), the airborne element of Unmanned Aircraft Systems (UAS), as defined by ASTM F 2395-07. ...The document is written for military unmanned aircraft intended for use primarily in military operational areas. The document also provides a foundation for considerations applicable to safe flight in all classes of airspace.
Technical Paper

Preliminary Project of the Autonomous Landing System for Unmanned Aircraft

1999-10-19
1999-01-5524
When the flight control system selects the LANDING option at chosen altitude (based on GPS and pressure altitude), a change in aircraft’s attitude is executed. New attitude ensures safe flare and touchdown of the unmanned aircraft. ...The autonomous control of an aircraft under the flare and touch-down maneuvers is an interesting problem of both theoretical and practical nature. ...In this paper, a concept of the autonomous landing system (ALS) for unmanned air vehicles (UAV) is presented. The flight control system is addressed to the low-cost, civilian, medium-size UAV with relatively low approach speed and typical nose-wheel landing gear.
Journal Article

Validation of Unmanned Aircraft Systems' Integration into the Airspace (VUSIL I and II)

2011-10-18
2011-01-2687
The VUSIL program has developed a concept for the integration of unmanned aircraft systems (UAS) into non-segregated airspace, which is also used by manned civil aviation. ...For the integration of UAS it is necessary for the Unmanned Aircraft (UA) pilot to be aware of the surrounding traffic in order to recognise and resolve possible conflicts. ...Collecting the ability requirements of unmanned aircraft pilots was also part of the program. To this end, the UA pilots filled in a job analysis questionnaire to gather first information about the required abilities.
Journal Article

Framework for Unmanned Aircraft Systems Safety Risk Management

2011-10-18
2011-01-2688
Although Unmanned Aircraft Systems (UAS) have now for some time been used in segregated airspace where separation from other air traffic can be assured, potential users have interests to deploy UAS in non segregated airspace. ...It will be necessary to show that these risks do not increase as compared to the current aviation system with manned aircraft only. This paper focuses on the provision of guidelines for steps 2 to 4 of a UAS SRM process, covering both types of risks. ...A method that addresses potential conflict scenarios (e.g. level busts, aircraft levelling of at the wrong flight level, flight track deviations due to operational errors) is proposed as basis for analysis of the risk of UAS to other airspace users.
Technical Paper

Propulsion System for Very High Altitude Subsonic Unmanned Aircraft

1998-04-21
981261
This paper explains why a spark ignited gasoline engine, intake pressurized with three cascaded stages of turbocharging, was selected to power NASA's contemplated next generation of high altitude atmospheric science aircraft. Beginning with the most urgent science needs (the atmospheric sampling mission) and tracing through the mission requirements which dictate the unique flight regime in which this aircraft has to operate (subsonic flight @ >80 kft) we briefly explore the physical problems and constraints, the available technology options and the cost drivers associated with developing a viable propulsion system for this highly specialized aircraft. ...Beginning with the most urgent science needs (the atmospheric sampling mission) and tracing through the mission requirements which dictate the unique flight regime in which this aircraft has to operate (subsonic flight @ >80 kft) we briefly explore the physical problems and constraints, the available technology options and the cost drivers associated with developing a viable propulsion system for this highly specialized aircraft. ...Beginning with the most urgent science needs (the atmospheric sampling mission) and tracing through the mission requirements which dictate the unique flight regime in which this aircraft has to operate (subsonic flight @ >80 kft) we briefly explore the physical problems and constraints, the available technology options and the cost drivers associated with developing a viable propulsion system for this highly specialized aircraft. The paper presents the two available options (the turbojet and the turbocharged spark ignited engine) which are discussed and compared in the context of the flight regime.
Technical Paper

Study of Unmanned Supersonic Aircraft Configuration

2013-10-07
2013-36-0353
The aim of this work is to present the preliminary configuration design studies for an unmanned, lightweight (less than 15 kg), supersonic research aircraft. The studies comprise the aircraft typical mission, the aerodynamic and structural arrangement, preliminary performance, as well as mass distribution. ...The studies comprise the aircraft typical mission, the aerodynamic and structural arrangement, preliminary performance, as well as mass distribution. The aircraft, an Unmanned Air Vehicle, or “UAV”, is named as Pohox (“arrow” in Maxakali indian language). ...The studies comprise the aircraft typical mission, the aerodynamic and structural arrangement, preliminary performance, as well as mass distribution.
Technical Paper

Study of Unmanned Supersonic Aircraft Configuration

2014-09-30
2014-36-0193
The aim of this work is to present the preliminary performance studies of the unmanned, lightweight (less than 10 kg), supersonic research aircraft. The studies comprise the typical mission for the aircraft's first supersonic version, based on the aerodynamic, thrust, and mass characteristics presented in a previous work. ...The studies comprise the typical mission for the aircraft's first supersonic version, based on the aerodynamic, thrust, and mass characteristics presented in a previous work. The aircraft, named as “Pohox”, is an Unmanned Air Vehicle, or “UAV”, and is intended to be the flying test bed for a multi cycle engine capable to provide thrust in subsonic, transonic and supersonic regimes. ...The present analysis can be considered as the natural step, after aircraft first definitions, towards the aircraft detailed design; and the results obtained provide good indications of the technical feasibility of the aircraft.
Technical Paper

Aerodynamic Analysis of an Unmanned Cyclogiro Aircraft

2018-10-29
2018-01-6005
Thus, a three-dimensional computational fluid dynamics (CFD) model is developed, validated, and used to analyze the D-Dalus L1 four-rotor unmanned aircraft operating under several configurations. The model solves the Euler equations using the OpenFOAM toolbox in order to provide fast results on a desktop computer. ...Such knowledge is, however, of crucial importance to tune the controller and rotor disposition of a cyclogiro aircraft. Thus, a three-dimensional computational fluid dynamics (CFD) model is developed, validated, and used to analyze the D-Dalus L1 four-rotor unmanned aircraft operating under several configurations.
Technical Paper

Development of a Safety Assessment Methodology for the Risk of Collision of an Unmanned Aircraft System with the Ground

2011-10-18
2011-01-2684
Recent technological developments and increased utilization of Unmanned Aircraft Systems (UAS) have widened their application from military operations to also civil and commercial operations. ...The objective of this paper is to develop and apply a safety risk analysis methodology for the risk of collision of an Unmanned Aircraft System with the ground. Such method could support regulators with the setting of UAS safety requirements. ...To better understand the differences between manned and unmanned aircraft, UAS performance characteristics are examined. This helps to clarify in which airspace classes the different available UAS may be able to fly.
Technical Paper

An Automatic Procedure for the Landing Gear Conceptual Design of a Light Unmanned Aircraft

2013-09-17
2013-01-2188
In this paper an automatic procedure aimed at preliminary designing an oleo-pneumatic landing gear strut for a light unmanned aircraft is presented. The whole work is motivated by the necessity to design the landing gear of the unmanned aircraft X-MALE, currently in development at the Italian Aerospace Research Center (CIRA SCpA), according to the Airworthiness Requirements NATO STANAG 4671 (USAR). ...The whole work is motivated by the necessity to design the landing gear of the unmanned aircraft X-MALE, currently in development at the Italian Aerospace Research Center (CIRA SCpA), according to the Airworthiness Requirements NATO STANAG 4671 (USAR). ...Differently from other Airworthiness Requirements for piloted aircraft, USAR.479, “Level Landing” imposes that, in the absence of specific experimental tests, the determination of spin-up and spring-back maximum loads must be carried-out by means of more rational analysis.
Journal Article

Designing a Hybrid Electric Powertrain for an Unmanned Aircraft with a Commercial Optimization Software

2017-06-29
2017-01-9000
The problem is particular critical in the aircraft field because of the strong constraints to be fulfilled (in particular in terms of weight and volume). ...The problem was addressed in the present investigation by linking an in-house simulation code for hybrid electric aircraft with a commercial many-objective optimization software. The design variables include the size of engine and electric motor, the specification of the battery (typology, nominal capacity, bus voltage), the cooling method of the motor and the battery management strategy.
X