Download or read book Mobile Propeller Dynamometer Validation written by Mason Wade Morris and published by . This book was released on 2013 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: With growing interest in UAVs and OSU's interest in propeller performance and manufacturing, evaluating UAV propeller and propulsion system performance has become essential. In attempts to evaluate these propellers a mobile propeller dynamometer has been designed, built, and tested. The mobile dyno has been designed to be cost effective through the ability to load it into the back of a test vehicle to create simulated forward flight characteristics. This allows much larger propellers to be dynamically tested without the use of large and expensive wind tunnels. While evaluating the accuracy of the dyno, several improvements had to be made to get accurate results. The decisions made to design and improve the mobile propeller dyno will be discussed along with attempts to validate the dyno by comparing its results against known sources. Another large part of assuring the accuracy of the mobile dyno is determining if the test vehicle will influence the flow going into the propellers being tested. The flow into the propeller needs to be as smooth and uniform as possible. This is determined by characterizing the boundary layer and accelerated flow over the vehicle. This evaluation was accomplished with extensive vehicle aerodynamic measurements with the use of full-scale tests using a pitot-rake and the actual test vehicle. Additional tests were conducted in Oklahoma State University's low speed wind tunnel with a 1/8-scale model using qualitative flow visualization with smoke. Continuing research on the mobile dyno will be discussed, along with other potential uses for the dyno.
Download or read book Dynamic Calibration of 35 hp Propeller Dynamometer written by G. L. Santore and published by . This book was released on 1952 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: A dynamic calibration was performed on a 35-hp propulsion dynamometer of the transmission type. It was found that no interactions existed between torque and thrust. Although a speed effect was noted, it produced no change in the sensitivity of the torque and thrust elements. (Author).
Download or read book The Dynamometer Hub for Testing Propellers and Engines During Flight written by O. Enoch and published by . This book was released on 1921 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The need for a "flying-test bench" to enable measurements of flight resistance, engine and propeller power and efficiency to be made during flight was experienced in interested circles as early as 1915, and it grew in proportion to the constant demand for increased flying capacity in our military types of aircraft. The problem was worked out in various ways by the German Aeronautical Laboratory (D.V.L.) at Adlershof. Unlike the method observed in the actual flying test-bench, where engine must be so installed that it can work freely, a dynamometer hub was inserted between the engine and the propeller by the D.V.L. It was approved as an accurate measuring device by the Propeller Testing Department of the Technical Section of Aviation (Flz.) at Adlershof, and was accordingly constructed there.
Download or read book Dynamometer written by Jyotindra S. Killedar and published by Xlibris Corporation. This book was released on 2012-10-25 with total page 609 pages. Available in PDF, EPUB and Kindle. Book excerpt: It all began way back in 1984 when I began my career in the field of dynamometer and engine testing when after years of gut-feeling and study I realized that there is a need for a book on dynamometer and its application to engine testing. As automotive and dynamometer industry is growing worldwide the concern eventually became so great I felt a book devoted to the subject was warranted. The book Dynamometer-Theory and Application to Engine Testing is a book dedicated to various dynamometers and how they are applied to engine testing. The book also discusses the essentials of modern test cell and the instrumentation, data acquisition system and other accessories that are employed in modern test cell. After having worked in the filed of industrial compressors, pumps, material handling equipment, dynamometer field and software industry I decided to write this book which will help the people working in the automotive industry, engine and vehicle testing, people working in the dynamometer and instrumentation industry and electrical motor industry. The book will be of interest to the studenrs of mechanical and automobile engineering. The book will be of great value to the incumbents entering in the automotive and dynamometer fields.
Download or read book The Installation and Calibration of a Dynamometer Test Cell written by Robert Vern Carter and published by . This book was released on 1948 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Army RD A written by and published by . This book was released on 1982 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Army R D A written by and published by . This book was released on 1984-07 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Procedure of Calibrating the Torque of Propeller Dynamometer J 04 Using Propeller Dynamometer A 11 as a Brake written by and published by . This book was released on 1956 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Langley 2 000 horsepower Propeller Dynamometer and Tests at High Speed of an NACA 10 3 08 03 Two blade Propeller written by and published by . This book was released on 1952 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Propeller Dynamometer for the Stevens Experimental Towing Tank written by Walter Gerstenberger and published by . This book was released on 1938 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Design Construction and Calibration of a Thrust and Torque Dynamometer for a Wind Tunnel Propeller Model written by A. F. Molland and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Twenty Second Symposium on Naval Hydrodynamics written by National Research Council and published by National Academies Press. This book was released on 2000-03-02 with total page 1039 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Twenty-Second Symposium on Naval Hydrodynamics was held in Washington, D.C., from August 9-14, 1998. It coincided with the 100th anniversary of the David Taylor Model Basin. This international symposium was organized jointly by the Office of Naval Research (Mechanics and Energy Conversion S&T Division), the National Research Council (Naval Studies Board), and the Naval Surface Warfare Center, Carderock Division (David Taylor Model Basin). This biennial symposium promotes the technical exchange of naval research developments of common interest to all the countries of the world. The forum encourages both formal and informal discussion of the presented papers, and the occasion provides an opportunity for direct communication between international peers.
Download or read book Army RD A Bulletin written by and published by . This book was released on 1984 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A More Comprehensive Database for Propeller Performance Validations at Low Reynolds Numbers written by Armin Ghoddoussi and published by . This book was released on 2016 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: Validation is the essential process of evaluating the precision and reliability of analytical or computational solutions. In this dissertation, a series of comprehensive propeller wind tunnel tests were designed for validation of propeller design and analysis techniques. This work focused primarily on small propellers operating at lower Reynolds numbers in the range of 90,000 to 120,000, which is particularly helpful for unmanned aerial vehicle applications. Extensive propeller and experimental apparatus geometries along with test section spatial dimensionality are described. An open-source computer-aided design (CAD) method was used to create the propeller blades, nacelle, and spinner surface outlines, aiming for easy reproduction. Two different propeller designs were tested: a simple propeller with a constant pitch-to-diameter ratio, chord length, and thickness; and a complex propeller with a pitch-to-diameter ratio and chord length as a function of blade radius. Both propellers with a variable pitch of five degrees increment were tested at several angle settings. Critical test section flow field and geometry information that can be used as boundary conditions are also presented in this study. In addition to classical propeller performance plots of thrust and torque coefficients and efficiency against the advance ratio, nacelle surface pressure distribution in terms of coefficients and propeller wake survey results are provided. Two different wind tunnels were utilized to evaluate the experimental and facility bias. Known errors, uncertainties, and instrumental accuracies are quantified and presented here.
Download or read book Test written by and published by . This book was released on 1980 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Report written by Cold Regions Research and Engineering Laboratory (U.S.) and published by . This book was released on 1950 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Practical Design of Ships and Mobile Units written by Marinus Willem Cornelis Oosterveld and published by Elsevier Publishing Company. This book was released on 1998 with total page 1110 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings contain the papers presented at the 7th International Symposium on Practical Design of Ships and Mobile Units. The symposium was held at the Congress Centre in The Hague, The Netherlands on 20-25 September, 1998.The overall aim of PRADS conferences is to advance the design of ships and mobile marine structures through the exchange of knowledge and the promotion of discussions on relevant topics in the fields of naval architecture and marine and offshore engineering. Greater international co-operation of this kind can help improve design and production methods and so increase the efficiency, economy and safety of ships and mobile units. The main themes of this symposium are design synthesis, production, ship hydromechanics, ship structures and materials and offshore engineering. Some topics which attracted many papers were design loads, design for ultimate strength, impact of safety and environment, grounding and collision, resistance and flow, seakeeping, fatigue considerations and propulsor and propulsion systems.
