Download or read book Low Order Nonlinear Dynamic Model of IC Engine Variable Pitch Propeller System for General Aviation Aircraft written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-20 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents a dynamic model of an internal combustion engine coupled to a variable pitch propeller. The low-order, nonlinear time-dependent model is useful for simulating the propulsion system of general aviation single-engine light aircraft. This model is suitable for investigating engine diagnostics and monitoring and for control design and development. Furthermore, the model may be extended to provide a tool for the study of engine emissions, fuel economy, component effects, alternative fuels, alternative engine cycles, flight simulators, sensors, and actuators. Results show that the model provides a reasonable representation of the propulsion system dynamics from zero to 10 Hertz. Richard, Jacques C. Glenn Research Center RTOP 505-62-50...

Download or read book Low order Nonlinear Dynamic Model of IC Engine variable Pitch Propeller System for General Aviation Aircraft written by and published by . This book was released on 1995 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Individual Cylinder Model of IC Engine Variable Pitch Propeller System for General Aviation Aircraft written by Gary Lee Parker and published by . This book was released on 1997 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1995 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aeronautical Engineering A Cumulative Index to a Continuing Bibliography supplement 325 written by and published by . This book was released on 1995 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Simple Dynamic Engine Model for Use in a Real time Aircraft Simulation with Thrust Vectoring written by Steven A. Johnson and published by . This book was released on 1990 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Variable Pitch Propellers written by H. L. Milner and published by . This book was released on 1928 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is proposed in this report to explain the Gloster Hele-Shaw Beacham variable pitch propeller.

Download or read book NASA SP written by and published by . This book was released on 1987 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book THE AIR PROPELLER written by FREDERICK BEDELL, PH.D. and published by . This book was released on 1919 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aeronautical Engineering A Cumulative Index to the 1984 Issues of the Continuing Bibliography written by and published by . This book was released on 1985 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aeronautical Engineering written by and published by . This book was released on 1987 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt: A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).

Download or read book Aircraft Propeller Design written by Fred Ernest Weick and published by . This book was released on 1930 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: En lærebog om flypropeller.

Download or read book Propeller Design A Simple System Based on Model Propeller Test Data 3 written by Fred E. Weick and published by . This book was released on 1926 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report, the third of a series of four, describes a simple system for designing propellers of a standard form. In this report, the system is based on tests of a family of model propellers of standard Navy form, the data from which have been extended by means of calculations to cover the complete range likely to be found in practice. However, it can be worked out for any family having propellers of on general form. This system can also be applied as given to propellers of different forms by means of form factors. Modifications are made for full scale flight conditions, i.e., the particular tip speed of the propeller, the body or fuselage interference.

Download or read book U S Government Research Reports written by and published by . This book was released on 1963 with total page 814 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Propeller Whirl Flutter Study of a Distributed Electric Aircraft Using Multibody Dynamics Analysis written by Kyle J Nelson and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The NASA X-57 experimental aircraft, is an adaptation of the twin turbo-propItalian Tecnam P2006T. Designed to be lighter, quieter, and more efficient optionalthan the traditional internal combustion option, the X-57 utilizes an electric propulsionsystem. Coupled with an electric propulsion system, a new lighter, thinner wing hasbeen developed by NASA to increase the cruise efficiency of the aircraft. An electric propulsion system removes the need for fossil fuels, creates a zero emission aircraft, andhelps achieve to a net 500% increase in cruise efficiency. Fourteen total propellers willbe fitted to the X-57. Two main propellers located at the wingtip will be used throughout all phases of flight. The other 12 propellers are lift-augmentation devices only used in the take-off and landing phases of flight. The propeller downwash increases the flow speed of the wing and avoid stall at low speed. A unique feature of the high-lift propellers is that they can fold against their nacelles to reduce drag during cruise; then deploy with centrifugal force when needed. These changes to the wing and propulsion system for the X-57 has increased concern for its aeroelastic stability, in particular, propeller whirl flutter. Propeller whirl flutter is an aeroelastic instability where the coupled motion of the airframe and propeller becomes unstable. This study uses multibody dynamics analysisto predict the propeller whirl flutter stability of the X-57 Maxwell. Multibody dynamics software has become increasingly popular in the rotorcraft communities because of their generality and capability to model complex, coupled systems. Dymore is a finite element (FE) based multibody dynamics code for the comprehensive modeling of nonlinear flexible multibody systems. The elements library in Dymore includes rigid and deformable bodies as well as joint elements. The aerodynamics are modeled using a built-in lifting line model but can also be coupled with an external code. The differential-algebraic equations of motion are established using a Lagrange multiplier method that is solved in a time marching scheme. The X-57 model being used in Dymore has: 1. a beam model of the propeller blades, and 2. a modal super element representation of the aircraft. The beam models in Dymore are derived from NASTRANFEM model for the wing and propeller blades. Tuned springs are used at the wingtip to capture the pylon modes of the tip propeller. A torsional spring is used to constrain the folding motion of the high-lift propellers. The modal super element model that is used is a reduced order model of the full NASTRAN model of the X-57 Maxwell. This model retains 6 rigid-body modes, the first 100 elastic modes as well as the degrees of freedom associated with the interface nodes chosen to be included in the model. CAMRAD II is another multibody dynamics code that was developed by Wayne Johnson and it will be a source of comparison for Dymore. Both codes have been established as being able to accurately predict the whirl flutter boundary of tilt-rotoraircraft [1, 2]. The scope of this study is to subject the X-57 propellers and a modal representation of the full-span wing with fuselage to a variety of conditions to determine the whirl flutter boundary of the aircraft. Isolated propellers are developed and compared against wind tunnel data to validate the aerodynamic models used. A study to subject an isolated propeller with increasing viscous damping about the folding hinge is performed to validate the stability of the folding blade motion and compared against experimental data. A baseline modal super-element model is used to compared against previous Dymore and CAMRAD results for a full-span model. This study only considers the influence of the tip-propeller to whirl flutter stability. The high-lift propellers are modeled as rigid bodies in the previous Dymore and CAMRAD models. A sensitivity study is carried out to compare the location of the high-lift propellers onthe stability of the X-57. This study showed that the out-board propellers have the highest damping contribution to model. A study is performed to determine the whirl flutter stability of the full system with contribution from all 14 propellers.

Download or read book Aerodynamics of the Propeller written by Fritz Weinig and published by . This book was released on 1948 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt: