Download or read book Dynamic Compensation and Force Calibration Techniques for a Static and Dynamic Thrust Measurement System written by F. L. Crosswy and published by . This book was released on 1968 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: An electrodynamic actuator and a solenoid-driven impact device were used separately for dynamic force excitation of an experimental thrust stand. Electronic compensation techniques were used to eliminate load cell signal distortions caused by the dynamic-force-induced transient response characteristics of the thrust stand structure. It was determined that proper compensation circuit adjustments could be made when using either the electronically and mechanically simple impact device or the more complex actuator. For the conditions of this particular study, identical dynamic force measurement accuracies wer e possible following either of two procedures, (1) dynamic time domain force calibration with the electrodynamic actuator or (2) dynamic compensation adjustments with dynamic force excitation furnished by the impact device followed by a static deadweight force calibration. (Author).
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 456 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 Dynamic Measuring Systems written by Sascha Eichstädt and published by Walter de Gruyter GmbH & Co KG. This book was released on 2023-11-06 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the concepts at the basis of dynamic measuring systems: vocabulary, modelling, calibration, measurement data analysis, uncertainty evaluation. It also provides the mathematical foundations for signal processing, stochastic processes and control theory, necessary for the analysis of dynamic measurements. Concepts and practical approaches for dynamic calibration and dynamic measurement are introduced to the readership through concrete examples ranging from mechanical quantities and medical ultrasound to the Internet of Things (IoT).
Download or read book U S Government Research Development Reports written by and published by . This book was released on 1969 with total page 1184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamic Compensation and Self calibration Techniques for Instrumentation Sensors written by Wilbur Gene James and published by . This book was released on 1961 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Society for Experimental Mechanics written by Society for Experimental Mechanics (U.S.) and published by . This book was released on 1991 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Government Research and Development Reports written by and published by . This book was released on 1969 with total page 1174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Government Research and Development Reports Index written by and published by . This book was released on 1969 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography of Scientific and Industrial Reports written by and published by . This book was released on 1969 with total page 1180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Strain Gauge Utilization for Aerial Vehicle Dynamic Load Measurement written by John Bazin and published by . This book was released on 2016 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: The strain gauge is a commonly used tool for dynamic load and strain measurement of a system. The work presented in this thesis describes the development and evaluation of strain gauges applied to both an aerodynamic decelerator system and an unmanned aerial vehicle. This thesis has three main objectives: (1)develop and evaluate test a circular parachute strain gauge-based load distribution measurement system, (2) develop and evaluate a strain gauge thrust estimation system for a quadrotor unmanned aircraft, and (3)compare the developed strain gauge-based thrust estimation technique with an indirect real time parameter estimation technique for motor fault detection. In pursuit of the fist thesis objective, a load distribution measurement system for the suspension lines of circular parachutes was developed. The motivation to create a load distribution measurement system stems from parachute system design traditionally requiring an extensive flight testing regimen. Numerical solution-based design is difficult due to the highly nonlinear deformation behavior of the parachute canopy. Traditionally, circular parachutes are assumed to have symmetric canopy loading upon inflation and during terminal descent. Asymmetric canopy loading can have a significant impact on circular parachute suspension line loads, but is typically neglected. The developed strain gauge-based load distribution measurement system for circular parachutes has wireless capabilities and can be readily applied to a wide variety of aerodynamic declarator systems. The developed system can be used to observe asymmetric behaviors in order to help determine the significance of asymmetric canopy loading. Custom strain gauge load cells with mounted custom circuitry to calibrate, amplify, and transmit the load data were fixed to canopy suspension lines. Parachute drop testing was performed to evaluate the effectiveness to identify any significant asymmetric canopy loading behavior. Drop testing was performed with a 1.2m (4.0ft) quarter-spherical cross based canopy with a payload of 2.0kg (4.4lbs). A 12m (39ft) guide-line based drop rig was implemented to prevent canopy rotational movement that could hinder testing repeatability. Load distribution data was fist verified via both static calibration and in-flight total canopy load measurements. Drop testing was then conducted to identify loading asymmetry during both inflation and terminal descent. Results demonstrated the use of the strain gauge-based load distribution measurement system for measuring significant asymmetric canopy loading patterns. In pursuit of the second thesis objective, strain gauges were used to aid in the development of a thrust estimation system for individual motors/propellers of a small quadrotor unmanned aerial vehicle (UAV). Small UAVs have become increasingly utilized for a wide range of applications; however, such aircraft typically do not undergo the same rigorous safety protocols as their larger human-piloted counterparts. A thrust estimation technique for a quadrotor unmanned aircraft was developed and evaluated that could potentially improve flight control design by increasing sensory feedback information. Strain gauges were integrated into the quadrotor frame to provide total force measurements on each arm of the aircraft. A dynamic model coupled with state information from motion capture and on-board measurement data was implemented to compensate for inertial forces caused by rotational and translational acceleration. Testing was conducted to evaluate the accuracy of the individual load cells, inertial compensation,and free-flight motor thrust estimates. Results demonstrate inertial force compensation during high frequency aircraft motion, which could potentially be useful for detecting an in-flight failure. The measurement system therefore has the potential to quickly detect an in-flight failure. The focus of the third thesis objective is to expand on the development of the thrust estimation system by performing an evaluation of the fault detection capabilities. A comparative study was conducted of the thrust estimation system along with a real time parameter estimation in the frequency domain during two motor failure scenarios of a small quadrotor UAV. Detecting and mitigating disturbances caused by in-flight mo tor/propeller failures is an important aspect of a robust flight controller for multirotor aircraft. The comparative study was performed in an attempt to determine whether direct thrust estimation (strain gauge-based) or indirect thrust estimation (parameter estimation using on-board measurement) more accurately and quickly capture an in-flight failure. Flight test results were post-processed to mimic real-time parameter estimation and strain gauged-based fault detection. Results show the strain gauge-based parameter estimation exhibits noisy estimates, but does have faster response to the failure. The parameter estimation using on board data does not respond to failures as quickly as the strain-gauge based technique, but does produce better parameter estimate stability. Although both estimation techniques display strengths and weaknesses, neither technique is optimal for real time failure detection individually. A combination of the real-time parameter estimation in the frequency domain and the strain gauge-based thrust estimation techniques may yield a fast yet stable fault detection system. The evaluation of the fault detection capabilities of the thrust estimation system did not prove unsuccessful, however it has warranted further investigation into the overall effectiveness of the system for fault detection.
Download or read book Government Reports Announcements written by and published by . This book was released on 1969 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index written by and published by . This book was released on 1969 with total page 1008 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1986-07 with total page 1224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Index written by and published by . This book was released on 1969 with total page 732 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 29th International Symposium on Shock Waves 1 written by Riccardo Bonazza and published by Springer. This book was released on 2015-07-09 with total page 832 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings present the results of the 29th International Symposium on Shock Waves (ISSW29) which was held in Madison, Wisconsin, U.S.A., from July 14 to July 19, 2013. It was organized by the Wisconsin Shock Tube Laboratory, which is part of the College of Engineering of the University of Wisconsin-Madison. The ISSW29 focused on the following areas: Blast Waves, Chemically Reactive Flows, Detonation and Combustion, Facilities, Flow Visualization, Hypersonic Flow, Ignition, Impact and Compaction, Industrial Applications, Magnetohydrodynamics, Medical and Biological Applications, Nozzle Flow, Numerical Methods, Plasmas, Propulsion, Richtmyer-Meshkov Instability, Shock-Boundary Layer Interaction, Shock Propagation and Reflection, Shock Vortex Interaction, Shock Waves in Condensed Matter, Shock Waves in Multiphase Flow, as well as Shock Waves in Rarefield Flow. The two Volumes contain the papers presented at the symposium and serve as a reference for the participants of the ISSW 29 and individuals interested in these fields.
Download or read book Instruments Control Systems written by and published by . This book was released on 1970 with total page 1088 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamic Calibration of Impact Test Instruments written by AI. Toropov and published by . This book was released on 1998 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper proposes a new dynamic calibration procedure of the force measuring system used in instrumented impact test apparatus. The method involves calculation of the force calibration factor on the basis of energy values obtained executing the Charpy or Izod test for a pendulum device and on the basis of velocity measurements in a rebound test for the falling dart impact apparatus. The procedure is simple, quick, and has the advantage that calibration is performed under the same dynamic conditions as in a test itself. Moreover, it does not require any additional equipment other than that used for conventional impact test execution: an impact device, an instrumented tup, and a data acquisition system.
