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6.0
Oct 6, 2020
10/20
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Dincă, Florea
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413 pages 25 cm
Topics: Vibration, Random vibration, VIBRATION, Nonlinear vibration & random vibration Mathematics
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307
Nov 4, 2017
11/17
by
Nigam, N. C
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This is the first comprehensive text on its subject to appear since the 1960s. It incorporates classical material with the many significant developments in the field and is the only up-to-date introduction currently available. Introduction to Random Vibrations presents a brief review of probability theory, a concise treatment of random variables and random processes (including normal, Poisson, and Markov processes), and a comprehensive exposition of the theory of random vibrations. It contains...
Topics: TECHNOLOGY & ENGINEERING / Mechanical, Random vibration, Stochastic processes,...
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283
Jun 20, 2010
06/10
by
NON
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Optimal control in bounded phase-coordinate processes and for antenna pointing direction subject to random disturbances
Topics: ATTITUDE CONTROL, DIRECTIONAL ANTENNA, MARKOV PROCESS, OPTIMAL CONTROL, RANDOM VIBRATION,...
297
297
Jun 27, 2010
06/10
by
Dugan, D. W
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Comparative performance of solid core nuclear and cryogenic chemical space propulsion systems
Topics: RANDOM VIBRATION, SPACECRAFT DESIGN, STATISTICAL DISTRIBUTIONS, RELIABILITY ANALYSIS, STATISTICAL...
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344
May 29, 2011
05/11
by
Robinson, David W
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A method of minimizing the optical distortion from gravity sag on a suspended large autocollimating flat mirror has been devised. This method consists of an inverted nine-point Hindle-Mount. A conventional Hindle-mount is located underneath a sky-viewing mirror and is primarily under compression loads from the weight of the mirror. It is not suitable for the situation where the mirror is viewing the ground, since a mirror would tend to fall out of the mount when in an inverted position. The...
Topics: RANDOM VIBRATION, VIBRATION TESTS, ACCELEROMETERS, VIBRATION METERS, CALIBRATING, ERRORS, FAILURE...
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3.0
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350 pages : 24 cm
Topics: Machinery -- Vibration, Random vibration, Stochastic processes, Stochastic Processes, Machines --...
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242
May 30, 2011
05/11
by
Rodriguez, Pedro I.; Smeltzer, Stanley S., II
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The goals and system-level requirements for the next generation aerospace vehicles emphasize safety, reliability, low-cost, and robustness rather than performance. Technologies, including new materials, design and analysis approaches, manufacturing and testing methods, operations and maintenance, and multidisciplinary systems-level vehicle development are key to increasing the safety and reducing the cost of aerospace launch systems. This chapter identifies the goals and needs of the next...
Topics: RANDOM VIBRATION, VIBRATION TESTS, STIRLING CYCLE, STIRLING ENGINES, DYNAMIC CHARACTERISTICS,...
540
540
Jul 5, 2010
07/10
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Bradley, D.; Buchholz, R. E
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For abstract, see N72-10933.
Topics: HUMAN BODY, PHYSIOLOGICAL EFFECTS, RANDOM VIBRATION, HUMAN TOLERANCES, NOISE (SOUND), SINE WAVES,...
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506
May 29, 2011
05/11
by
Lin, Jensen; Iliff, Kenneth W
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In this paper, we present closed-form formulas for the lift and moment coefficients of a lifting surface in two dimensional, unsteady, compressible, subsonic flow utilizing a newly developed explicit analytical solution of the Possio equation. Numerical calculations are consistent with previous numerical tables based on series expansions or ad hoc numerical schemes. More importantly, these formulas lend themselves readily to flutter analysis, compared with the tedious table-look-up schemes...
Topics: ADVANCED MICROWAVE SOUNDING UNIT, VIBRATION TESTS, EARTH OBSERVING SYSTEM (EOS), METEOROLOGICAL...
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192
Jul 11, 2010
07/10
by
Newkirk, G., Jr
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Results from a seminar on the role of solar magnetic fields in determining the structure of the corona and interplanetary medium are presented. Some topics considered are: (1) polar regions of the sun which have identical magnetic configurations but display a vastly different appearance in the corona, (2) the influence of latitude on coronal and interplanetary microstructure, and (3) the role of the corona in contributing to the solar wind. It is proposed that an out-of-the-ecliptic solar probe...
Topics: ENVIRONMENTAL TESTS, STRUCTURAL ENGINEERING, SPACECRAFT COMPONENTS, SPECIFICATIONS, STATISTICAL...
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385
Jul 6, 2010
07/10
by
Okda, J
texts
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To express the noise reducing effect of a muffler in terms of the difference in the sound power levels radiated from the tailpipe exit with and without the muffler in the system, equations are deduced by means of the four-terminal constants (A B C D) of the equivalent electrical network of the whole muffler system. Measured curves are in good agreement with those obtained by graphical methods so far as the sound wave in the chamber can be regarded as a plane wave. In the higher frequency range...
Topics: HARMONIC MOTION, HUMAN REACTIONS, OPERATOR PERFORMANCE, RANDOM VIBRATION, DYNAMIC RESPONSE, MAN...
Shock and vibration tests were performed to determine the electron optical properties of the electron gun. The test procedure included complete mechanical inspection including a dimensional check of all critical parts. Electrical inspection involved tests for dielectric strengths and element to element leakage resistance. All test circuits and equipment for each test are specified in the test plan.
Topics: NASA Technical Reports Server (NTRS), ELECTRON GUNS, SHOCK TESTS, VIBRATION TESTS, CIRCUITS,...
The Naval Postgraduate School CubeSat Launcher (NPSCuL) is a five-sided structure capable of carrying up to 24 CubeSats to orbit. The vibration test environment for CubeSats flying on NPSCuL on the Atlas-V is extremely harsh, partly due to the input vibration environment from the launch vehicle itself, and partly due to amplification from the NPSCuL structure. This thesis documents the implementation of a relatively new technology, Force Limited Vibration Testing (FLVT), and the design of a...
Topics: Force Limited Vibration Testing, Isogrid, Increasing stiffness, Finite Element Analysis, Random...
Force-Limited Random Vibration Testing has been applied in the last several years at the NASA Goddard Space Flight Center (GSFC) and other NASA centers for various programs at the instrument and spacecraft level. Different techniques have been developed over the last few decades to estimate the dynamic forces that the test article under consideration will encounter in the flight environment. Some of these techniques are described in the handbook, NASA-HDBK-7004, and the monograph, NASA-RP-1403....
Topics: NASA Technical Reports Server (NTRS), RANDOM VIBRATION, VIBRATION TESTS, ACCELEROMETERS, VIBRATION...
A gas-charging plug can be easily analyzed for random vibration. The design features two steeped O-rings in a radial configuration at two different diameters, with a 0.050-in. (.1.3-mm) diameter through-hole between the two O-rings. In the charging state, the top O-ring is engaged and sealing. The bottom O-ring outer diameter is not squeezed, and allows air to flow by it into the tank. The inner diameter is stretched to plug the gland diameter, and is restrained by the O-ring groove. The...
Topics: NASA Technical Reports Server (NTRS), O RING SEALS, PLUGS, RANDOM VIBRATION, LEAKAGE, CHARGING, GAS...
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188
May 29, 2011
05/11
by
Taylor, M. J.; Murray, I. S.; Jenniskens, P
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Small meteoric fragments are ejected at significant transverse velocities from some (up to approx. 8%) fast Leonid meteors. We reach this conclusion using low light intensified image measurements obtained during the 1999 Leonid Multi-Instrument Aircraft Campaign. High spatial resolution, narrow band image measurements of the Mg I emission at 518 nm have been used to clearly identify jet-like features in the meteor head that are the same as first observed in white light. We postulate that these...
Topics: RESEARCH AND DEVELOPMENT, STIRLING CYCLE, SPACECRAFT POWER SUPPLIES, ELECTRIC POWER SUPPLIES,...
The advantages of the digital methods over the analog vibration methods are demonstrated. The following topics are covered: (1) methods of computer-controlled random vibration and reverberation acoustic testing, (2) methods of computer-controlled sinewave vibration testing, and (3) methods of computer-controlled shock testing. General algorithms are described in the form of block diagrams and flow diagrams.
Topics: NASA Technical Reports Server (NTRS), ANALOG SIMULATION, DIGITAL TECHNIQUES, RANDOM VIBRATION,...
An analytical study on low frequency noise transmission into rectangular enclosures by viscoelastic sandwich panels is presented. Soft compressible cores with dilatational modes and hard incompressible cores with dilatational modes neglected are considered as limiting cases of core stiffness. It is reported that these panels can effect significant noise reduction.
Topics: NASA Technical Reports Server (NTRS), LOW FREQUENCIES, RANDOM VIBRATION, SOUND TRANSMISSION, NOISE...
Objective : Can current high energy COTS Li-ion cell designs tolerate rigorous random vibration levels?
Topics: NASA Technical Reports Server (NTRS), COMMERCIAL OFF-THE-SHELF PRODUCTS, LITHIUM BATTERIES,...
This Test Operating Procedure (TOP) is to be used as a guideline for development of Laboratory Vibration Test Schedules (LVTS) for Multiple Degree-of-Freedom (MDOF) scenarios.
Topics: DTIC Archive, REDSTONE TEST CENTER REDSTONE ARSENAL AL, *LABORATORY TESTS, *RANDOM VIBRATION,...
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May 28, 2011
05/11
by
Gopalswamy, N.; Kaiser, M. L.; Sato, J.; Pick, Moniqu
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A metric type II burst and a 'brow' type enhancement in EUV were observed during the hard X-ray flare of 1997 April 15 from a newly emerging region, AR 8032. The position of the type II burst obtained from the Nancay radioheliograph coincided with the EUV transient. The type II burst and the EUV transient were in the equatorial streamer region to the north of the flaring region. This observation suggests that the EUV transient may be the manifestation of the MHD shock responsible for the type...
Topics: MICROELECTRONICS, SHAFTS (MACHINE ELEMENTS), LOADS (FORCES), CYCLES, THERMAL CYCLING TESTS,...
The standard method for defining static equivalent structural load factors for components is based on Mile s equation. Unless test data is available, 5% critical damping is assumed for all components when calculating loads. Application of this method to electrical cable tie-down hardware often results in high loads, which often exceed the capability of typical tie-down options such as cable ties and P-clamps. Random vibration testing of electrical cables was used to better understand the...
Topics: NASA Technical Reports Server (NTRS), STRUCTURAL DESIGN, STATIC LOADS, RANDOM VIBRATION, LOADS...
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273
May 28, 2011
05/11
by
Anderson, James G
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The NASA Stratospheric Tracers of Atmospheric Transport (STRAT) mission was initiated to advance knowledge of the major transport mechanisms of the upper troposphere-lower stratosphere. This is the region of the atmosphere within which exchange processes take place that critically determine the response of the climate system and ozone distribution to changing conditions triggered by the release of chemicals at the surface. The mission series that extended from October 1995 to November 1997 was...
Topics: MICROELECTRONICS, TEST FACILITIES, DEGRADATION, CODERS, DAMAGE, ELECTRO-OPTICS, STRUCTURAL FAILURE,...
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593
May 31, 2011
05/11
by
Nelson, Michael L
texts
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Current discussion of digital libraries (DLs) is often dominated by the merits of the respective storage, search and retrieval functionality of archives, repositories, search engines, search interfaces and database systems. While these technologies are necessary for information management, the information content is more important than the systems used for its storage and retrieval. Digital information should have the same long-term survivability prospects as traditional hardcopy information...
Topics: BOUNDARY LAYER FLOW, SOLUTES, STABILITY, VIBRATION, FLUID DYNAMICS, FLUID FLOW, INCOMPRESSIBLE...
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253
Jun 9, 2011
06/11
by
Pougatchev, Nikita S
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Carbon monoxide is considered mission critical (TRACE-P NRA) because it is one of the gases involved in controlling the oxidizing power of the atmosphere and, as a tracer gas, is valuable in interpreting mission data sets. Carbon monoxide exhibits interannual differences, suggesting relatively short-term imbalances in sources and sinks. Sources of CO are dominated by fossil fuel combustion, biomass burning, and the photochemical oxidation of CH4 and nonmethane hydrocarbons while reaction with...
Topics: ION OPTICS, ELECTRIC POTENTIAL, TEST FACILITIES, MOLYBDENUM, VIBRATION TESTS, ION PROPULSION,...
The purpose of this test report is to summarize results from the vibration testing of the INFICON Transpector MPH100M model Mass Spectrometer. It also identifies requirements satisfied, and procedures used in the test. As a payload of Resource Prospector, it is necessary to determine the survivability of the mass spectrometer to proto-qualification level random vibration. Changes in sensitivity of the mass spectrometer can be interpreted as a change in alignment of the instrument. The results...
Topics: NASA Technical Reports Server (NTRS), VIBRATION TESTS, RANDOM VIBRATION, MASS SPECTROMETERS,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), RANDOM VIBRATION, STRUCTURAL ENGINEERING, DYNAMIC LOADS,...
A number of techniques for dealing with important technical aspects of the random vibration control problem are described. These include the generation of pseudo-random and true random noise, the control spectrum estimation problem, the accuracy/speed tradeoff, and control correction strategies. System hardware, the operator-system interface, safety features, and operational capabilities of sophisticated digital random vibration control systems are also discussed.
Topics: NASA Technical Reports Server (NTRS), CONFERENCES, CONTROL THEORY, DIGITAL SYSTEMS, VIBRATION...
This TOP presents guidance procedures for the planning and conduct of Environmental Stress Screening (ESS) tests. ESS is a process where hardware is exposed to one or more environments in a serial fashion to accelerate the discovery of design, workmanship, or part flaws inherent in electrical, optical, or mechanical equipment. Emphasis is placed on temperature cycling and random vibration test environments to include instructions for the conduct of thermal and vibration surveys.
Topics: DTIC Archive, WHITE SANDS MISSILE RANGE NM, *STRESS TESTING, *ENVIRONMENTAL TESTS, *ROCKETS,...
This report documents the results of an SBIR Phase I feasibility study on the prediction of the fatigue of composite panels subjected to an extreme environment, i.e., both high temperatures (and temperatures gradients) and a transverse acoustic loading. Of particular interest in this study are situations in which the plate is buckled by the thermal effects and experiences frequent snap-throughs, i.e., excursions from one buckled state to the other. First, a large displacements small strains...
Topics: DTIC Archive, Chen, P C, ZONA TECHNOLOGY INC SCOTTSDALE AZ, *STRUCTURAL MECHANICS,...
The purpose of this report is to present a qualification level vibration testing performed on the S/N 202, EOS AMSU-A1 Instrument was vibration tested to qualification levels per the Ref. 1 shop order. The instrument withstood the 8 g sine sweep test, the 7.5 Grms random vibration test, and the 18.75 g sine burst test in each of the three orthogonal axes. Some loss of transmissibility, however, is seen in the lower reflector after Z-axis random vibration. The test sequence was not without...
Topics: NASA Technical Reports Server (NTRS), ADVANCED MICROWAVE SOUNDING UNIT, PERFORMANCE TESTS,...
Report discusses conceptual designs of automatic digitally controlled vibration fatigue test facilities for inducing high cycle random flexural fatigue of coupon specimens; recommends a facility for use at AFFDL; presents block diagrams and charts of major system components and subsystems. Report also describes random flexural fatigue tests conducted on aluminum and titanium riveted cantilever beam specimens with zero mean stress; presents data for 2024- T81 bare aluminum alloy at 75 degree F...
Topics: DTIC Archive, Bartel, Harold W, LOCKHEED-GEORGIA CO MARIETTA, *FATIGUE TESTS(MECHANICS), *RANDOM...
A problem of interest to the Air Force is the design of acoustically sound aircraft structural components. This is because sonic fatigue failures have resulted in unacceptable maintenance and inspection burdens associated with the operation of the aircraft. In some instances, sonic fatigue failures have resulted in major redesign efforts of structural components. Currently, the sonic fatigue design methods are based upon a combination of experimental and analytical techniques. The analytical...
Topics: DTIC Archive, Mei, Chuh, OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS, *SONIC FATIGUE, *STRUCTURES,...
The standard random vibration qualification test used for Expendable Launch Vehicle components is Maximum Predicted Environment (MPE) + 6dB for a duration of 4 times the service life of the part. This can be a severe qualification test for these fatigue-sensitive structures. This paper uses flight data from several launch vehicles to establish that reducing the qualification approach to MPE+3dB for the duration of the peak environment (1x life) is valid for fatigue-sensitive structural...
Topics: NASA Technical Reports Server (NTRS), LAUNCH VEHICLES, RANDOM VIBRATION, FATIGUE (MATERIALS),...
This procedure describes the methods to be used for environmental stress screening (ESS) of the Lightning Mapper Sensor (LMS) lens assembly. Unless otherwise specified, the procedures shall be completed in the order listed, prior to performance of the Acceptance Test Procedure (ATP). The first unit, S/N 001, will be subjected to the Qualification Vibration Levels, while the remainder will be tested at the Operational Level. Prior to ESS, all units will undergo Pre-ESS Functional Testing that...
Topics: NASA Technical Reports Server (NTRS), ENVIRONMENTAL TESTS, STRESSES, LIGHTNING, MAPPING, DETECTION,...
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727
May 26, 2011
05/11
by
Davis, Sanford S.; Malcolm, Gerald N
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Unsteady aerodynamic loads were measured on an oscillating NACA 64A010 airfoil In the NASA Ames 11 by 11 ft Transonic Wind Tunnel. Data are presented to show the effect of the unsteady shock-wave/boundary-layer interaction on the fundamental frequency lift, moment, and pressure distributions. The data show that weak shock waves induce an unsteady pressure distribution that can be predicted quite well, while stronger shock waves cause complex frequency-dependent distributions due to flow...
Topics: MICROELECTRONICS, STRUCTURAL FAILURE, SAFETY, DEGRADATION, DAMAGE, CODERS, SHOCK MEASURING...
A multi-input/output random vibration control algorithm was developed based on system identification concepts derived from random vibration spectral analysis theory. The unique features of the algorithm are: (1) the number of input excitors and the number of output control responses need not be identical; (2) the system inverse response matrix is obtained directly from the input/output spectral matrix; and (3) the system inverse response matrix is updated every control loop cycle to accommodate...
Topics: NASA Technical Reports Server (NTRS), ALGORITHMS, COMPUTERIZED SIMULATION, CONTROL THEORY, INPUT,...
In this paper, a method for obtaining nonlinear stiffness coefficients in modal coordinates for geometrically nonlinear finite-element models is developed. The method requires application of a finite-element program with a geometrically non- linear static capability. The MSC/NASTRAN code is employed for this purpose. The equations of motion of a MDOF system are formulated in modal coordinates. A set of linear eigenvectors is used to approximate the solution of the nonlinear problem. The random...
Topics: NASA Technical Reports Server (NTRS), NONLINEAR SYSTEMS, STIFFNESS, COEFFICIENTS, FINITE ELEMENT...
This is the Engineering Test Report, AMSU-A2 METSAT Instrument (S/N 105) Vibration Tests Summary, P/N 1331720-2, for the Integrated Advanced Microwave Sounding Unit-A (AMSU-A).
Topics: NASA Technical Reports Server (NTRS), ADVANCED MICROWAVE SOUNDING UNIT, VIBRATION TESTS, EARTH...
Measurement of the gradient of the gravitational acceleration from a satellite platform is likely to provide the next improvement in knowledge of the Earth's gravity field after the upcoming Geopotential Research Mission. Observations from the subsatellite of a tethered satellite system (TSS) would increase sensitivity and resolution due to the low altitude possible. However, the TSS is a dynamically noisy system and would be perturbed by atmospheric drag fluctuations. The dynamic noise is...
Topics: NASA Technical Reports Server (NTRS), GRAVIMETRY, RANDOM VIBRATION, TETHERED SATELLITES, DRAG,...
The Dept. of Aviation Australia has modified a gulfstream G.695A aircraft to carry external stores on the fuselage. A vibration test followed by a series of flight trails were conducted to satisfy some of the requirements of certification. A description of these tests together with the results is given. keywords include: Aeroelasticity, Flutter, Random vibration, Flight tests, and Resonance testing.
Topics: DTIC Archive, Farrell,P A, AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA), *EXTERNAL STORES, *JET...
One presumption of scientific microgravity research is that while in space disturbances are minimized and experiments can be conducted in the absence of gravity. The problem with this assumption is that numerous disturbances actually occur in the space environment. Scientists must consider all disturbances when planning microgravity experiments. Although small disturbances, such as a human sneeze, do not cause most researchers on earth much concern, in space, these minuscule disturbances can be...
Topics: NASA Technical Reports Server (NTRS), VIBRATION ISOLATORS, AEROSPACE ENVIRONMENTS, VIBRATION...
A random-force method has been developed to predict dynamic loads produced by rocket-engine random vibrations for new rocket-engine designs. The method develops random forces at multiple excitation points based on random vibration environments scaled from accelerometer data obtained during hot-fire tests of existing rocket engines. This random-force method applies random forces to the model and creates expected dynamic response in a manner that simulates the way the operating engine applies...
Topics: NASA Technical Reports Server (NTRS), DYNAMIC LOADS, EXCITATION, MATHEMATICAL MODELS, RANDOM...
The general methodology for the analysis of arbitrary nonstationary random data is reviewed. A specific parametric model, called the product model, that has applications to space vehicle launch vibration data analysis is discussed. Illustrations are given using the nonstationary launch vibration data measured on the Space Shuttle orbiter vehicle.
Topics: NASA Technical Reports Server (NTRS), DATA PROCESSING, RANDOM VIBRATION, SPACE SHUTTLES, STRUCTURAL...
Random decrement signatures of structures vibrating in a random environment are studied through use of computer-generated and experimental data. Statistical properties obtained indicate that these signatures are stable in form and scale and hence, should have wide application in one-line failure detection and damping measurement. On-line procedures are described and equations for estimating record-length requirements to obtain signatures of a prescribed precision are given.
Topics: NASA Technical Reports Server (NTRS), RANDOM VIBRATION, STRUCTURAL ANALYSIS, STRUCTURAL VIBRATION,...
New tactical ground vehicles developed by the U.S. Army are lower in weight and capable of higher speeds than their predecessors. This combination produces repetitive mechanical shocks that are transmitted to the soldier primarily through the seating system. Under certain operating conditions, this exposure poses health and safety threats to the crew as well as performance degradation due to fatigue. The Army Surgeon General urgently required the Medical Research and Materiel Command to develop...
Topics: DTIC Archive, Village, Judy, CANADIAN COMMERCIAL CORP OTTAWA (ONTARIO), *PERFORMANCE(HUMAN),...
This paper presents a deterministic theory for the random vibration problem for predicting the response of structures in the low-frequency range (0 to 20 hertz) of launch transients. Also presented are some innovative ways to characterize noise and highlights of ongoing test-analysis correlation efforts titled the Verification Test Article (VETA) project.
Topics: NASA Technical Reports Server (NTRS), ACOUSTIC FATIGUE, RANDOM VIBRATION, VIBRATIONAL STRESS,...
The results of a random vibration test screening (RVSS) study of the determination of the upper and lower vibration limits on printed wiring assemblies (PWA) are summarized. The study results are intended to serve as a guide for engineers and designers who make decisions on PWA features that need to withstand the stresses of dynamic testing and screening. The maximum allowable PWA deflection, G levels, and PSD levels are compared to the expected or actual levels to determine if deleterious...
Topics: NASA Technical Reports Server (NTRS), COMPONENT RELIABILITY, MICROELECTRONICS, PRINTED CIRCUITS,...
Results are presented of a research task to evaluate structural responses at various subsystem mounting locations during spacecraft level test exposures to the environments of mechanical shock, acoustic noise, and random vibration. This statistical evaluation is presented in the form of recommended subsystem test specifications for these three environments as normalized to a reference set of spacecraft test levels and are thus suitable for extrapolation to a set of different spacecraft test...
Topics: NASA Technical Reports Server (NTRS), ENVIRONMENTAL TESTS, SPACECRAFT COMPONENTS, SPECIFICATIONS,...
In the previous study of first order models with 8 response variables to predict fatigue life in elastic range under random vibrations, 4 variables showed significant effects. In this part of the research both first and second order models of these 4 significant variables based on 10, 18, and 24 tests are developed. The tables of analysis of variance, and of predicted lives together with their residuals and 95% confidence intervals are constructed for each of the first and second order models....
Topics: DTIC Archive, Huang,T C, WISCONSIN UNIV-MADISON DEPT OF ENGINEERING MECHANICS, *FATIGUE LIFE,...
