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  Subjects -> ENVIRONMENTAL STUDIES (Total: 767 journals)
    - ENVIRONMENTAL STUDIES (704 journals)
    - POLLUTION (21 journals)
    - TOXICOLOGY AND ENVIRONMENTAL SAFETY (34 journals)
    - WASTE MANAGEMENT (8 journals)

ENVIRONMENTAL STUDIES (704 journals)            First | 1 2 3 4 5 6 7 8     

International innovation. Environment     Open Access  
International Journal of Acarology     Hybrid Journal   (Followers: 1)
International Journal of Advancement in Earth and Enviromental Sciences     Open Access   (Followers: 2)
International Journal of African Renaissance Studies - Multi-, Inter- and Transdisciplinarity     Hybrid Journal   (Followers: 2)
International Journal of Agricultural and Environmental Information Systems     Full-text available via subscription   (Followers: 1)
International Journal of Alternative Propulsion     Hybrid Journal   (Followers: 1)
International Journal of Applied Psychoanalytic Studies     Hybrid Journal   (Followers: 2)
International Journal of Chinese Culture and Management     Hybrid Journal   (Followers: 1)
International Journal of Corrosion     Open Access   (Followers: 10)
International Journal of Critical Infrastructures     Hybrid Journal   (Followers: 3)
International Journal of Disaster Risk Reduction     Hybrid Journal   (Followers: 6)
International Journal of Disaster Risk Science     Open Access   (Followers: 8)
International Journal of Ecological Economics and Statistics     Full-text available via subscription   (Followers: 1)
International Journal of Ecology     Open Access   (Followers: 8)
International Journal of Ecology & Development     Full-text available via subscription   (Followers: 1)
International Journal of Energy and Environmental Engineering     Open Access   (Followers: 2)
International Journal of Environment     Open Access   (Followers: 3)
International Journal of Environment and Health     Hybrid Journal   (Followers: 7)
International Journal of Environment and Pollution     Hybrid Journal   (Followers: 6)
International Journal of Environment and Sustainable Development     Hybrid Journal   (Followers: 14)
International Journal of Environment and Waste Management     Hybrid Journal   (Followers: 6)
International Journal of Environment, Workplace and Employment     Hybrid Journal   (Followers: 3)
International Journal of Environmental Engineering     Hybrid Journal   (Followers: 5)
International Journal of Environmental Health Engineering     Open Access  
International Journal of Environmental Health Research     Hybrid Journal   (Followers: 3)
International Journal of Environmental Policy and Decision Making     Hybrid Journal   (Followers: 10)
International Journal of Environmental Protection     Open Access   (Followers: 12)
International Journal of Environmental Research and Public Health     Open Access   (Followers: 14)
International Journal of Environmental Science and Technology     Hybrid Journal   (Followers: 5)
International Journal of Environmental Studies     Hybrid Journal   (Followers: 11)
International Journal of Exergy     Hybrid Journal   (Followers: 4)
International Journal of Forest, Soil and Erosion     Open Access   (Followers: 3)
International Journal of Global Environmental Issues     Hybrid Journal   (Followers: 4)
International Journal of Global Warming     Hybrid Journal   (Followers: 5)
International Journal of Greenhouse Gas Control     Partially Free   (Followers: 6)
International Journal of Health Planning and Management     Hybrid Journal   (Followers: 6)
International Journal of Hygiene and Environmental Health     Hybrid Journal   (Followers: 6)
International Journal of Logistics Research and Applications : A Leading Journal of Supply Chain Management     Hybrid Journal   (Followers: 9)
International Journal of Philosophical Studies     Hybrid Journal   (Followers: 2)
International Journal of Phytoremediation     Hybrid Journal   (Followers: 1)
International Journal of Process Systems Engineering     Hybrid Journal   (Followers: 1)
International Journal of Recycling of Organic Waste in Agriculture     Open Access   (Followers: 1)
International Journal of Regulation and Governance     Hybrid Journal   (Followers: 2)
International Journal of Reliability and Safety     Hybrid Journal   (Followers: 5)
International Journal of Renewable Energy Development     Open Access   (Followers: 6)
International Journal of Social Sciences and Management     Open Access  
International Journal of Soil, Sediment and Water     Open Access   (Followers: 8)
International Journal of Stress Management     Full-text available via subscription   (Followers: 8)
International Journal of Sustainable Construction Engineering and Technology     Open Access   (Followers: 7)
International Journal of Sustainable Engineering     Hybrid Journal   (Followers: 7)
International Journal of Sustainable Materials and Structural Systems     Hybrid Journal   (Followers: 5)
International Journal of Sustainable Society     Hybrid Journal   (Followers: 7)
International Journal of Testing     Hybrid Journal   (Followers: 1)
International Journal of the Commons     Open Access   (Followers: 3)
International Journal of Toxicology     Hybrid Journal   (Followers: 6)
International Journal of Water Resources and Environmental Engineering     Open Access   (Followers: 1)
International Review of Environmental and Resource Economics     Full-text available via subscription  
International Studies in the Philosophy of Science     Hybrid Journal   (Followers: 9)
Interventions : International Journal of Postcolonial Studies     Hybrid Journal   (Followers: 5)
IOP Conference Series: Earth and Environmental Science     Open Access   (Followers: 7)
Iranian Journal of Environmental Health Science & Engineering     Open Access   (Followers: 1)
Iranian Studies     Hybrid Journal   (Followers: 7)
Irish Educational Studies     Hybrid Journal   (Followers: 1)
Irish Journal of Earth Sciences     Full-text available via subscription  
Irish Political Studies     Hybrid Journal   (Followers: 7)
ISLE: Interdisciplinary Studies in Literature and Environment     Hybrid Journal   (Followers: 2)
Isotopes in Environmental and Health Studies     Hybrid Journal   (Followers: 2)
Israel Studies     Full-text available via subscription   (Followers: 5)
ISRN Ecology     Open Access  
ISRN Environmental Chemistry     Open Access  
Jahangirnagar University Environmental Bulletin     Open Access  
Journal of Bioremediation & Biodegradation     Open Access   (Followers: 2)
Journal of Earth Science & Climatic Change     Open Access   (Followers: 8)
Journal of Petroleum & Environmental Biotechnology     Open Access   (Followers: 2)
Journal of Advances in Environmental Health Research     Open Access  
Journal of Agricultural and Environmental Ethics     Hybrid Journal   (Followers: 7)
Journal of Agricultural Biotechnology and Sustainable Development     Open Access  
Journal of Agriculture and Environment     Open Access  
Journal of Agriculture and Environment for International Development     Open Access   (Followers: 6)
Journal of Agrobiology     Open Access   (Followers: 2)
Journal of Applied Ecology     Hybrid Journal   (Followers: 197)
Journal of Applied Meteorology and Climatology     Full-text available via subscription   (Followers: 7)
Journal of Applied Psychoanalytic Studies     Hybrid Journal   (Followers: 1)
Journal of Applied Sciences and Environmental Management     Open Access   (Followers: 1)
Journal of Applied Sciences in Environmental Sanitation     Open Access   (Followers: 6)
Journal of Applied Toxicology     Hybrid Journal   (Followers: 9)
Journal of Applied Volcanology     Open Access   (Followers: 6)
Journal of Arid Environments     Hybrid Journal   (Followers: 8)
Journal of Asian Studies     Full-text available via subscription   (Followers: 23)
Journal of Biochemical and Molecular Toxicology     Hybrid Journal   (Followers: 5)
Journal of Black Studies     Hybrid Journal   (Followers: 2)
Journal of Chemical Ecology     Hybrid Journal   (Followers: 2)
Journal of Chemical Health and Safety     Hybrid Journal   (Followers: 2)
Journal of Climate     Full-text available via subscription   (Followers: 23)
Journal of Coastal Research     Full-text available via subscription   (Followers: 11)
Journal of Computational Environmental Sciences     Open Access  
Journal of Contaminant Hydrology     Hybrid Journal   (Followers: 9)
Journal of Contemporary European Studies     Hybrid Journal   (Followers: 4)
Journal of East African Natural History     Full-text available via subscription   (Followers: 5)
Journal of Ecology     Hybrid Journal   (Followers: 37)

  First | 1 2 3 4 5 6 7 8     

Journal of the IEST
   Journal TOC RSS feeds Export to Zotero Follow    
   Full-text available via subscription Subscription journal
     ISSN (Print) 1098-4321 - ISSN (Online) 1557-2196
     Published by Institute of Environmental Sciences and Technology Homepage  [1 journal]   [SJR: 0.101]   [H-I: 8]
  • Minimum Input Trace for Multiple Input Multiple Output Linear Systems
    • Abstract: Specification of the cross spectra for a multiple-input/multiple-output (MIMO) vibration test is challenging. This paper presents a method for tests where the specifications of the output (the control points) autospectra are available. The autospectra of the outputs are specified and cross spectra between the outputs are derived that will minimize the trace of the autospectra of the inputs (the drive signals) with the constraint that the input spectral density matrix is positive definite. The hypothesis is that nature likes a minimum energy solution.
      Content Type Journal Article
      Category Peer-reviewed Technical Papers
      Pages 57-67

      Authors
      David O. Smallwood, Albuquerque, New Mexico
      Journal Journal of the IEST
      Online ISSN 1557-2196
      Print ISSN 1098-4321
      Journal Volume Volume 56
      Journal Issue Volume 56, Number 2 / October 2013
      PubDate: Mon, 28 Oct 2013 13:32:01 GMT
       
  • Evaluating Aerosol Transmission Efficiency in a Sampling System
    • Abstract: This work examines the physical factors that contribute to sampling errors in an aerosol sampling system consisting of a sampling probe and a sampling line. Aerosol particles are more massive than gas molecules and therefore tend to deviate from air streamlines in response to sudden directional change, which potentially leads to sampling errors during sample transfer processes. Based on well-established studies involving particle transport and deposition, an analysis was performed to determine the sampling line transmission efficiency for 0.5- and 5-μm particles as these particle sizes are used in defining air cleanliness level in ISO 14644-1[1] and FED-STD-209E.[2]* Our analytical results indicate that significant particle losses for 5-μm particles can occur if bends exist in the sampling lines. In addition, particle losses typically can be reduced by lowering the air velocity in the sampling line, and this can be achieved by using a sampling line with a larger inner diameter (I.D.). The example calculations also showed that 0.5-μm particles, with their insignificant inertia, have nearly 100% transmission efficiency regardless of the sampling line bends.
      Content Type Journal Article
      Category Peer-reviewed Technical Papers
      Pages 29-42

      Authors
      De-Ling Liu, Contamination Control Section, Micro/Nano Technology Department, The Aerospace Corporation
      Journal Journal of the IEST
      Online ISSN 1557-2196
      Print ISSN 1098-4321
      Journal Volume Volume 56
      Journal Issue Volume 56, Number 2 / October 2013
      PubDate: Mon, 28 Oct 2013 13:32:01 GMT
       
  • Highly Accelerated Life Test (HALT) Program at Space Systems Loral
    • Abstract: Highly Accelerated Life Testing (HALT) is used in the commercial electronics industry to improve product robustness prior to starting production. The basic theory is that testing well beyond expected, intended-use environments may uncover design flaws that could become field failures after a product is in production. By fixing issues prior to starting production, costly recalls can be avoided. HALT has proven to be effective, as evidenced by its wide incorporation in the commercial electronics industry. Could HALT also be worth the time and expense of performing on commercial satellite hardware, which is designed to rigorous standards and tested over military-grade environmental test specifications? This paper summarizes Space Systems/Loral's (SS/L) initial experience with HALT, experience over time, and refinement of the traditional HALT process with emphasis on finding the operating limit margins before purposely searching for any failure limits. The methodology used by SS/L has proven to be effective when introducing new technologies and complex designs for use on commercial satellites.
      Content Type Journal Article
      Category Technical Papers
      Pages 1-19

      Authors
      Brian Kosinski, Space Systems/Loral, Palo Alto, California, USA
      Dennis Cronin, Space Systems/Loral, Palo Alto, California, USA
      Journal Journal of the IEST
      Online ISSN 1557-2196
      Print ISSN 1098-4321
      Journal Volume Volume 56
      Journal Issue Volume 56, Number 2 / October 2013
      PubDate: Mon, 28 Oct 2013 13:32:01 GMT
       
  • Evaluation of Vibration References with Equivalent Kurtosis and Dissimilar
           Amplitude Probability Densities
    • Abstract: The generation of Gaussian noise with a specific auto spectral density (ASD) is a well-documented process employed in drive signal generation in vibration control applications. In recent years, vibration control system vendors have introduced the ability to modify the probability density function (PDF) characteristics associated with the reference ASD, yielding a non-Gaussian drive. The specific parameter defining this process is kurtosis. This paper will discuss concerns with this practice in terms of synthesizing a time history with dissimilar PDF characteristics to that of the measured data upon which the original ASD and kurtosis characteristics were based. An example is discussed from both statistical and fatigue perspectives.
      Content Type Journal Article
      Category Peer-reviewed Technical Papers
      Pages 43-56

      Authors
      Michael T. Hale, Redstone Test Center, Army Test and Evaluation Command
      William A. Barber, Redstone Test Center, Army Test and Evaluation Command
      Journal Journal of the IEST
      Online ISSN 1557-2196
      Print ISSN 1098-4321
      Journal Volume Volume 56
      Journal Issue Volume 56, Number 2 / October 2013
      PubDate: Mon, 28 Oct 2013 13:32:01 GMT
       
  • Laboratory Staff Evaluation Process
    • Abstract: Objectively evaluating laboratory staff is a very difficult task. Variations in supported equipment, student performance, and process sensitivity prevent the use of direct, objective criteria in employee performance measurement. These factors are multiplied in research facilities, where equipment uptime and process performance measurements are not easily determined. Supervisors, therefore, must apply more subjective techniques in staff evaluation, which often results in the perception of inequity. This paper presents a rigorous evaluation process that utilizes significant employee participation to address this issue of perceived inequity.The process utilizes five areas of evaluation: Goals and Accountability; Job Performance; Individual Characteristics; Aspirations and Assistance; and Employee Feedback. These areas, applied through an employee self-evaluation followed by direct interaction between employee and supervisor, serve as discussion points as well as a means of performance documentation. While still primarily subjective in nature, the process significantly reduces any perception of unfairness and allows the employee to document issues for future reference. Introduced six years ago at the Birck Nanotechnology Center at Purdue University, the process has undergone numerous tweaks and enhancements leading to the version documented in this paper.
      Content Type Journal Article
      Category Peer-reviewed Technical Papers
      Pages 68-75

      Authors
      John R. Weaver, Birck Nanotechnology Center, Discovery Park, Purdue University
      Journal Journal of the IEST
      Online ISSN 1557-2196
      Print ISSN 1098-4321
      Journal Volume Volume 56
      Journal Issue Volume 56, Number 2 / October 2013
      PubDate: Mon, 28 Oct 2013 13:32:01 GMT
       
  • Evaluating Aerosol Aspiration Efficiency in Fast-moving Air
    • Abstract: Sampling representative aerosol particles in fast-moving air is a challenging task. Aerosols are significantly more massive than gas molecules, thus they might not follow air streamlines well and could be more easily subjected to sampling errors. This work examines the physical factors that govern the aspiration efficiency of an aerosol sampling probe in unidirectional moving air, and explores the plausible sampling deviations under various high air velocity scenarios. The particle sizes of 0.5 and 5 μm are of particular interest due to their use in defining air cleanliness levels in ISO 14644-1[1] and FED-STD-209.[2]* Our analytical results indicate that significant sampling errors could occur for 5-μm particles when a thick-walled sampling probe is used, or when the air velocity at the sampling probe inlet does not match the velocity of the incoming air (i.e., anisokinetic sampling). The aspiration efficiency of 0.5-μm particles, on the other hand, is nearly 100% due to sufficiently small inertia of these particles.
      Content Type Journal Article
      Category Peer-reviewed Technical Papers
      Pages 20-28

      Authors
      De-Ling Liu, Contamination Control Section, Micro/Nano Technology Department, The Aerospace Corporation
      Journal Journal of the IEST
      Online ISSN 1557-2196
      Print ISSN 1098-4321
      Journal Volume Volume 56
      Journal Issue Volume 56, Number 2 / October 2013
      PubDate: Mon, 28 Oct 2013 13:32:01 GMT
       
  • IEST and UGIM Working Together
    • Abstract: IEST and UGIM Working Together
      Content Type Journal Article
      Category Tech Talk Articles
      Pages 1-2

      Authors
      John R. Weaver, Birck Nanotechnology Center, Purdue University IEST Fellow, Discovery Park
      Journal Journal of the IEST
      Online ISSN 1557-2196
      Print ISSN 1098-4321
      Journal Volume Volume 56
      Journal Issue Volume 56, Number 1 / March 2013
      PubDate: Tue, 05 Mar 2013 17:33:49 GMT
       
  • Facilities Planning for Safety and Emergency Response: Bridging the Gap
           between Design Features and Safety Planning
    • Abstract: This article describes some of the safety considerations for the design and construction of micro/nano facilities and applicable building code provisions. The two key elements required for safe operation in micro and nanotechnology facilities are: (1) engineered features incorporated into building construction, and (2) administrative features that deal with how people work within the facility.
      Content Type Journal Article
      Category Tech Talk Articles
      Pages 17-28

      Authors
      Steve Schultz, HDR Architecture, Inc.
      Jack Paul, HDR Architecture, Inc.
      Journal Journal of the IEST
      Online ISSN 1557-2196
      Print ISSN 1098-4321
      Journal Volume Volume 56
      Journal Issue Volume 56, Number 1 / March 2013
      PubDate: Tue, 05 Mar 2013 17:33:49 GMT
       
  • Financial and Operational Survey of 12 Major University Nanofabrication
           Facilities: A Benchmarking Study
    • Abstract: Efficiently running a major nanofabrication research user facility within the framework of a university is a daunting task. Operational costs, staffing, training, safety, and the diversity of the research, faculty, and users are but a few of the challenges facing the management team. This article reports on a subset of metrics used to characterize such user facilities, based on an extensive survey of 12 major university laboratories. Data relating to such factors as laboratory staffing, operating costs, subsidies, cost recovery, tuition, comparative tool rates, hours of use, and populations are summarized and reported on in the context of determining a reasonable measure of an efficient laboratory operation.
      Content Type Journal Article
      Category Tech Talk Articles
      Pages 29-37

      Authors
      Dennis Grimard, Electrical Engineering and Computer Science, University of Michigan
      Lisa Jones, Electrical Engineering and Computer Science, University of Michigan
      Journal Journal of the IEST
      Online ISSN 1557-2196
      Print ISSN 1098-4321
      Journal Volume Volume 56
      Journal Issue Volume 56, Number 1 / March 2013
      PubDate: Tue, 05 Mar 2013 17:33:49 GMT
       
  • Willis J. Whitfield: Father of the Modern Cleanroom
    • Abstract: Willis J. Whitfield: Father of the Modern Cleanroom
      Content Type Journal Article
      Category Tech Talk Articles
      Pages 42-43
      Journal Journal of the IEST
      Online ISSN 1557-2196
      Print ISSN 1098-4321
      Journal Volume Volume 56
      Journal Issue Volume 56, Number 1 / March 2013
      PubDate: Tue, 05 Mar 2013 17:33:49 GMT
       
  • Retrospective: Historical Highlights of an Evolving Society
    • Abstract: Retrospective: Historical Highlights of an Evolving Society
      Content Type Journal Article
      Category Tech Talk Articles
      Pages 38-41
      Journal Journal of the IEST
      Online ISSN 1557-2196
      Print ISSN 1098-4321
      Journal Volume Volume 56
      Journal Issue Volume 56, Number 1 / March 2013
      PubDate: Tue, 05 Mar 2013 17:33:49 GMT
       
  • Case Study: Design and Construction of the Draper Laboratory
           Microfabrication Center
    • Abstract: For 25 years, Draper Laboratory has been active in the areas of microelectromechanical systems (MEMS) and multichip modules (MCM), using two separate laboratories. When these laboratories were constructed, cleanroom technology was in its mid-life cycle. To meet evolving R&D needs, the cleanroom facilities recently underwent a major renovation as described in this article.
      Content Type Journal Article
      Category Tech Talk Articles
      Pages 3-16

      Authors
      Richard H. Morrison, Draper Laboratory
      Livia M. Racz, Draper Laboratory
      David J. Carter, Draper Laboratory
      Journal Journal of the IEST
      Online ISSN 1557-2196
      Print ISSN 1098-4321
      Journal Volume Volume 56
      Journal Issue Volume 56, Number 1 / March 2013
      PubDate: Tue, 05 Mar 2013 17:33:49 GMT
       
  • Prediction Model for Particle Fallout in Cleanrooms
    • Abstract: Particle fallout in cleanrooms is a primary concern for industries manufacturing super critical products with surfaces highly susceptible to particulate contamination. Limited research has been conducted to predict the contribution of particulate contamination by production activities in cleanrooms. This paper describes a prediction model that utilizes the relationship between airborne particulate contamination and particle fallout, and the relationship between particle fallout and spatial variations, to predict the level of particle fallout on product surfaces in the cleanroom. Experimental modeling and statistical process control techniques were employed in establishing the above relationships and validation was performed by comparing the predictions from the model with actual observations at production cleanrooms.
      Content Type Journal Article
      Category Peer-reviewed Technical Papers
      Pages 1-9

      Authors
      Dinesh Kumar Parasuraman, ASML
      Antonius Arnoldus Maria Kemps, ASML
      Hans P. M. Veeke, Delft University of Technology
      Gabriel Lodewijks, Delft University of Technology
      Journal Journal of the IEST

      Online ISSN 1098-4321
      Journal Volume Volume 55
      Journal Issue Volume 55, Number 1 / October 2012
      PubDate: Mon, 29 Oct 2012 15:32:21 GMT
       
  • Validation Techniques for 6-DOF Vibration Data Acquisition
    • Abstract: Multiple Degree of Freedom (MDOF) excitation systems and MDOF vibration control systems continue to improve, and are now standard equipment in many dynamic test laboratories. Determination of an input specification for such MDOF systems is critically dependent on properly acquired field data. Validation of field data will be discussed and demonstrated employing the same transformation tools used in both transformation-based 6-degree-of-freedom (6-DOF) vibration control and generalized MDOF vibration specification development (VSD).
      Content Type Journal Article
      Category Peer-reviewed Technical Papers
      Pages 10-24

      Authors
      Michael T. Hale, Dynamic Test Division, Redstone Test Center Army Test and Evaluation Command
      Jesse F. Porter, Dynamic Test Division, Redstone Test Center Army Test and Evaluation Command
      Journal Journal of the IEST

      Online ISSN 1098-4321
      Journal Volume Volume 55
      Journal Issue Volume 55, Number 1 / October 2012
      PubDate: Mon, 29 Oct 2012 15:32:21 GMT
       
  • Validation of Pyroshock Data
    • Abstract: This paper presents a comprehensive description of pyroshock, the interpretation of pyroshock data, and the validation of pyroshock data. Recent events in the pyroshock testing community show that corrupted pyroshock data are still being acquired at government agencies and private companies. A large part of this paper is devoted to acquisition and analysis of pyroshock data because proper time-history data acquisition and, consequently, test specification development are common industry problems. To avoid corrupted pyroshock data and thus corrupted pyroshock specifications, recommended practices for instrumentation and data acquisition systems as well as data analyses are provided. Causes of corrupted pyroshock data are explored and recommendations for avoiding corrupted pyroshock data are presented.
      Content Type Journal Article
      Category Peer-reviewed Technical Papers
      Pages 40-56

      Authors
      Vesta I. Bateman, Mechanical Shock Consulting Harry Himelblau
      Ronald Merritt, Jacobs Engineering - Naval Systems Group
      Journal Journal of the IEST

      Online ISSN 1098-4321
      Journal Volume Volume 55
      Journal Issue Volume 55, Number 1 / October 2012
      PubDate: Mon, 29 Oct 2012 15:32:21 GMT
       
  • Validation of Measured Dynamic Data Using Rigid Body Response
    • Abstract: As multiple axis vibration testing has become more widespread, it has become increasingly important to ensure the instrumentation is accurately portrayed in the instrumentation table. However, errors do occur. The method used in this paper to help uncover these errors is based on the condition that at low frequencies (below any resonant frequencies of the object being studied) the response is essentially rigid body. The spectral density matrix (SDM) at a low frequency, of many more than six response measurements, is decomposed using singular value decomposition (SVD). Under the assumption of rigid body response, it is assumed that the first six singular vectors are linear combinations of the six rigid body modes. The best linear fit is then calculated for this fit. The measurements are then removed one at a time, and the reduction in the fit error is calculated. It is assumed that if the removal of a measurement reduces the error significantly, that measurement is likely in error.
      Content Type Journal Article
      Category Peer-reviewed Technical Papers
      Pages 25-39

      Authors
      David O. Smallwood, Albuquerque, New Mexico
      Journal Journal of the IEST

      Online ISSN 1098-4321
      Journal Volume Volume 55
      Journal Issue Volume 55, Number 1 / October 2012
      PubDate: Mon, 29 Oct 2012 15:32:21 GMT
       
  • Relationship between Strain and Velocity for Ground Vehicle Vibration
    • Abstract: This paper uses experimental vibration data to evaluate the relationship between strain and velocity on a ground vehicle platform. The data also are used to compare the acceleration and the strain. Comparisons are made in the time, frequency, and damage domains. The results clearly show the strain data are more closely related to the vibratory velocity than to the acceleration, but the analysis is complicated somewhat by characteristics of the experimental data set.
      Content Type Journal Article
      Category Peer-reviewed Technical Papers
      Pages 57-67

      Authors
      George O. White, US Army Materiel Systems Analysis Activity (AMSAA), Aberdeen Proving Ground, MD
      Journal Journal of the IEST

      Online ISSN 1098-4321
      Journal Volume Volume 55
      Journal Issue Volume 55, Number 1 / October 2012
      PubDate: Mon, 29 Oct 2012 15:32:21 GMT
       
  • Do You Know that Your Accelerated Vibration Test Requirement Is
           Correct'
    • Abstract: Vibration test time-compression methods have existed for decades and are well-documented. However, not all practitioners are aware of how these methods were developed and the proper utilization of the developed theory. While many sources have attempted to clarify the methodology, there is confusion on many points. The objective of this paper is to help new vibration test engineers understand accelerated testing theory and practice. The lab is a valuable training ground, but sometimes the subtleties are not communicated. A more complete understanding of the theory and practice of vibration test time-compression methods is needed when translating contract requirements into test procedures used in product development and validation.
      Content Type Journal Article
      Category Peer-reviewed Technical Papers
      Pages 68-79

      Authors
      Dustin S. Aldridge, Raytheon Missile Systems, Tucson, Arizona
      Journal Journal of the IEST

      Online ISSN 1098-4321
      Journal Volume Volume 55
      Journal Issue Volume 55, Number 1 / October 2012
      PubDate: Mon, 29 Oct 2012 15:32:21 GMT
       
  • Spatial Variability Caused by Acoustic Wave Interference in Single-Drive
           Direct Field Acoustic Testing
    • Abstract: A significant amount of acoustic spatial variability is characteristic of direct field acoustic testing using a single random signal to drive the loudspeaker sources. This has raised concerns about the potential for under- and over-testing of hardware, particularly because of the consequential high sensitivity of the test environment upon the configuration of the test equipment and test hardware. Meanwhile, little is known about the specific spatial characteristics of the test acoustic field. A recent demonstration single-drive direct field acoustic test afforded the opportunity to map various planes of the acoustic field with a 36 microphone grid, offering unprecedented physical insight into the field characteristics. Analysis of the data reveals that the field is predominantly characterized by wave interference patterns at any given frequency. These data correlate well with 3-dimensional numerical models. The presence of wave interference patterns created by the fully correlated array of sources also explains the occurrence of frequency bands where the acoustic levels were significantly overdriven as a consequence of the control microphone locations coinciding with acoustic nodes associated with the corresponding drive frequencies. For comparison, the same mapping was performed in a conventional reverberant chamber test with the microphone grid, showing detailed contrast in spatial characteristics between the two test methods. This paper presents the highlights of this study and discusses ramifications for the use of this methodology.
      Content Type Journal Article
      Category Technical Papers
      Pages 54-74

      Authors
      Michael B. Van Dyke, The Aerospace Corporation, El Segundo, California
      Portia R. Peters, The Aerospace Corporation, El Segundo, California
      Journal Journal of the IEST
      Online ISSN 1557-2196
      Print ISSN 1098-4321
      Journal Volume Volume 54
      Journal Issue Volume 54, Number 2 / October 2011
      PubDate: Mon, 24 Oct 2011 18:32:35 GMT
       
  • Limitations of the Power Spectral Density as an Indicator of Test Severity
    • Abstract: This paper presents a set of experimental data comparing repetitive shock (RS) vibration, single-axis electrodynamic (ED) vibration, and multi-axis ED vibration. It was found that multi-axis testing is more severe than single-axis testing at the same level. In addition, weaknesses were found in the RS system at low frequency. Smoothing of the data or poor line resolution was also shown to change the overall severity of a test. A poor correlation was shown between the power spectral density (PSD) and the rate of natural frequency change (RFC) over a wide frequency shift. The change in natural frequency caused the initial PSD to be an ineffective indicator of test severity. Quantification of the severity of the test profile can be accomplished through characterization of the RFC.
      Content Type Journal Article
      Category Peer-reviewed Technical Papers
      Pages 116-128

      Authors
      Mark Paulus, Naval Undersea Warfare Center (NUWC) Keyport
      Journal Journal of the IEST

      Online ISSN 1098-4321
      Journal Volume Volume 54
      Journal Issue Volume 54, Number 2 / October 2011
      PubDate: Mon, 24 Oct 2011 18:32:35 GMT
       
 
 
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