Douglas Reynolds

Professor, Mechanical Engineering

Phone:  702-895-3807
Mail Code: 4027
Email: reynolds@nye.nscee.edu

Research areas:

Design of Quiet Air Distribution Systems for Commercial Buildings
Sound Insulation Loss measurements with Duct Silencers in HVAC Systems
Air Bladder Technology Related to Hand Vibration and Shock Prevention
Vibration Transmissibility of Resiliant Isolation Materials

Teaching:

MEG (431/631) Mechanical Vibrations
MEG (434/634) Noise Control
MEG (720) Acoustics I
MEG (721) Acoustics II
MEG (726) Vibrations I
MEG (727) Vibrations II

NATIONAL AND INTERNATIONAL COMMITTEE ASSIGNMENTS
 American National Standards Institute Standards Committee S3/Working Group 39 - Human Exposure to Vibration
  And Shock; Chairman
 International Standards Organization Technical Committee 108/Subcommittee 4 - Human Exposure to Vibration
  And Shock; Chairman of USA Technical Advisory Group; Chief USA Delegate to ISO TC 108/SC 4 International
  Meetings
 National Environmental Balancing Bureau; Member - Sound and Vibration Committee


FIELDS OF EXPERIENCE:
Dr. Reynolds has developed an extensive background in analytical, practical, and experimental techniques associate with acoustics, vibration, and noise and vibration control. He has taught university courses in the areas of linear systems, design, kinematics and dynamics of machines, mechanical measurements and experimental techniques, vibrations, and acoustics. He is the author of the text, Engineering Principles of Acoustics - Noise and Vibration Control, published by Allyn and Bacon. He has worked to develop computer programs, techniques, and procedures where microcomputers can be used to more efficiently complete engineering analysis and data gathering and processing. Dr. Reynolds has worked with trade associations and governmental agencies in developing test procedures for vibration measurements of hand-held power tools and of the human hand and arm. He has developed extensive mathematical models of the vibration response characteristics of the hand and arm. He has developed and patented an air bladder technology that can be used in gloves and on tool handles to reduce the vibration energy directed into the hands from vibrating hand tools. His work in these areas has received both national and international recognition. He has worked in the areas of environmental noise that deal with land use planning and determining the noise effects of airports on surrounding communities. Dr. Reynolds has worked in the area of heating, ventilating, and air conditioning noise control in buildings and in the area of aircraft cabin noise reduction. He is the author of the Trane Acoustics Program and the HVAC Acoustics Program for Windows 95 on predictive acoustics for HVAC systems. He is the co-author of the book, Algorithms for HVAC Acoustics, published by the American Society of Heating, Refrigerating, and Air-Conditioning Engineers. He is the author of the books, Sound and Vibration Design and Analysis and Procedural Standard for Acoustic and Vibration Calculations and Measurements for Environmental Systems, published by the National Environmental Balancing Bureau. Dr. Reynolds has extensive experience in the area of architectural acoustics as it pertains to the design of noise-sensitive areas in buildings, such as auditoriums, theaters, church sanctuaries, broadcasting and recording studios, and multi-function areas. Dr. Reynolds is the founder and Director of the Center for Mechanical & Environmental Systems Technology in the Howard R. Hughes College of Engineering. This center has gained both national and international recognition as a premier center for testing and conducting research in the areas HVAC acoustics and airflow characteristics of HVAC system elements.

C HAPTERS, BOOKS AND COMPUTER PROGRAMS:
 1. Engineering Principals of Acoustics - Noise and Vibration Control, Ally and Bacon, 1981.
 2. The Trane Acoustics Program (DOS), The Trane Company, La Crosse, WI, 1985.
 3. HVAC Acoustics Program (DOS), D.D.R., Inc., Las Vegas, NV, 1984.
 4. Chapter 11, "Noise and Vibration Control," HVAC Systems Duct Design Manual, Sheet Metal and Air Conditioning Contractors' National Association, Inc., 1991.
 5. Algorithms for HVAC Acoustics, (with J. Bledsoe), ASHRAE, 1991.
 6. Procedural Standards for Sound and Vibration, National Environmental Balancing Bureau, 1995.
 7. Design and Analysis of Sound and Vibration, National Environmental Balancing Bureau, 1995.
 8. Chapter 43, "Acoustics", ASHRAE 1995 Applications Handbook; main editor for revision of chapter.
 9. HVAC Acoustics Program for Windows 95, D.D.R., Inc., Las Vegas, NV, 1998.
 10. WinSilencer Program for Windows 95, D.D.R., Inc., Las Vegas, NV, 1997.

Selected Recent Publications: 1. "Cutting Characteristics and Power Requirements of Chain Saws," (with W. Soedel and C. Eckelman), Forest Products Journal, Vol. 20, No. 10, pp. 28-34, 1970.

2. "Matching of Chain Saw Power Requirements with Engine Characteristics," (with W. Soedel), Forest Products Journal, Vol. 22, No. 1, pp. 56-60, 1972.

3. "Dynamic Response of the Hand-Arm System to a Sinusoidal Input," (with W. Soedel), Journal of Sound and Vibration, Vol. 21, pp. 339-353, 1972.

4. "Analytical Model of a Slider-Crank Mechanism Using Lagrange's Equation (Application to Vibration of Chain Saws)", (with W. Soedel), ASME Pamphlet 73-WA/DE-18, 1973.

5. "Vibration Characteristics of Non-Isolated Chain Saws," (with W. Soedel), Journal of Sound and Vibration, Vol. 32, No. 3, pp. 371-382, 1974.

6. "Hand-Arm Vibration - An Engineering Approach," (with C. Jokel), American Industrial Hygiene Association Journal, Vol. 35, No. 10, pp. 613-621, 1975.

7. "Analytical Vibration Analysis of Non-Isolated Chain Saws," (with W. Soedel), Journal of Sound and Vibration, Vol. 44, No.3, pp. 513-523, 1976.

8. "Hand-Arm Vibration - Part I: Analytical Model of the Vibration Response Characteristics of the Hand," (with R. H. Keith), Journal of Sound and Vibration, Vol. 51, No. 2, pp. 237-253, 1977.

9. "Hand-Arm Vibration - Part II: Vibration Transmission Characteristics of the Hand and Arm," (with E. N. Angevine), Journal of Sound and Vibration, Vol. 51, No. 2, pp. 255-265, 1977.

10. "Hand-Arm Vibration - Part III: Subjective Response Characteristics of Individuals to Hand-Induced Vibration," (with K. G. Standlee and E. N. Angevine), Journal of Sound and Vibration, Vol. 51, No. 2, pp 267-281, 1977.

11. "Analytical Modeling of a Wave Interference Microphone," (with T. Carnes and E. L. Hixson), ASME Pamphlet 80-WA/NC-6, 1980.

12. "Analytical Modeling of a Wave Interference Microphone," (with T. Carnes and E. L. Hixson), Journal of Engineering for Industry, Vol. 103, pp. 361-371, 1981.

13. "Mechanical Test Stand for the Measurement of the Vibration Levels of Chain Saws During Cutting Operations," (with F. L. Wilson), Journal of Sound and Vibration, Vol. 88, No. 1, pp. 65-84.

14. "Propeller Fan Dynamics - 1: Static Vibration Test Procedure," (with T. Carnes), ASHRAE Transactions, Vol. 90, Part 1, pp. 262-274, 1984.

15. "Propeller Fan Dynamics - II: Dynamic Vibration Test Procedure," (with T. Carnes), ASHRAE Transactions, Vol. 90, Part 1, pp. 275-285, 1984.

16. "A Study of Hand Vibration on Chipping and Grinding Operators - Part I: Vibration Acceleration Levels Measured on Pneumatic Tools Used in Chipping and Grinding Operations," (with R. Basel, D. E. Wasserman, and W. Taylor), Journal of Sound and Vibration, Vol. 95, No. 4, pp. 479-497, 1984.

17. "A Study of Hand Vibration on Chipping and Grinding Operators - Part II: Four-Degree-of-Freedom, Lumped Parameter Model of the Vibration Response of the Human Hand," (with R. J. Falkenberg), Journal of Sound and Vibration, Vol. 95, No. 4, pp. 499-514, 1984.

18. "A Study of Hand Vibration on Chipping and Grinding Operators - Part III: Energy Levels into the Hands of Operators of Pneumataic Tools Used in Chipping and Grinding Operations," (with D. E. Wasserman, R. Basel, and W. Taylor), Journal of Sound and Vibration, Vol. 95, No. 4, pp. 515-524, 1984.
 
19. "Sound Transmission through Mechanical Equipment Room Walls, Floor, or Ceiling," (with J. Bledsoe), ASHRAE Transactions, Vol. 95, Pt. 1, pp. 83-89, 1989.

20. "Sound Attenuation of Unlined and Acoustically Lined Rectangular Ducts," (with J. Bledsoe), ASHRAE Transactions, Vol. 95, Pt. 1, pp. 90-95, 1989.

21. "Sound Attenuation of Acoustically Lined Circular Ducts and Radiused Elbows," (with J. Bledsoe), ASHRAE Transactions, Vol. 95, Pt. 1, pp. 96-99, 1989.

22. "Vibration Response of Propeller Fans under Actual Operating Conditions: I. Operational Tests of Four-Blade Propeller Fans," (with J. Bledsoe, W. Culbredth, S. Ladkany), ASHRAE Transaction, Vol. 95, Pt. 2, pp. 77-81, 1989.

23. "Vibration Response of Propeller Fans under Actual Operating Conditions: II. Finite Element Studies of the Vibration Response of Propeller Fans under Centrifugal Stiffening," (with S. Ladkany, M. Rouas, P. Baade), Accepted for publication in ASHRAE Transactions, Vol. 96, Pt. 1, 1990.

24. "Vibration Response of Propeller Fans under Actual Operating Conditions: III. Finite Element Studies of the Influence of Welded and Riveted Connections on the Vibration Response of Propeller Fans," (with S. Ladkany, M. Rouas), ASHRAE Transactions, Vol. 95, Pt. 2, pp. 82-87, 1989.

25. "Vibration Response of Propeller Fans under Actual Operating Conditions: IV. Automatic Generation of Curved and Twisted Propeller Fan Surfaces for a Dynamic Analysis by Finite Elements," (with S. Ladkany, M. Rouas), ASHRAE Transactions, Vol. 95, Pt. 2, pp. 88-91, 1989.

26. "Application of a New Technology to the Design of Effective Anti-Vibration Gloves." (D. Weaver and T. Jetzer), Central European Journal of Public Health, No. 2, Vol. 4, pp. 140-144, May 1996.

27. "Methods for Resolving Fan/Motor Vibration Problems in Air-Conditioning Units: I - Experimental Procedures for Identifying Vibration Modes Excited by Fan Impeller Imbalance." (C. Teng and M. Trabia), ASHRAE Transactions, Vol. 104, Pt. 1, January 1998.

28. "Methods for Resolving Fan/Motor Vibration Problems in Air-Conditioning Units: II - Theoretical Models for Identifying Vibration Modes Excited by Fan Impeller Imbalance." (C. Teng and M. Trabia), ASHRAE Transactions, Vol. 104, Pt. 1, January 1998.

29. "Methods for Resolving Fan/Motor Vibration Problems in Air-Conditioning Units: III - Experimental Procedures for Investigating Torsional Vibration in Air-Conditioning Units." (C. Teng), ASHRAE Transactions, Vol. 104, Pt. 1, January 1998.

30. "Methods for Resolving Fan/Motor Vibration Problems in Air-Conditioning Units: IV - Experimental Procedures for Measuring Motor Torque Pulsations." C. Teng), ASHRAE Transactions, Vol. 104, Pt. 1, January 1998.

31. "Design and Evaluation of an Inexpensive Test System for Conducting Glove Vibration Test per ISO Standard 10819." (with J. Stein), accepted for presentation and publication at the 7th International Conference on Hand-Arm Vibration, Umea, Sweden, June 9-12, 1998.

32. "Evaluation of the Test Procedures Specified for the Testing of Anti-Vibration Gloves in ISO Standard 10819 and Recommendations for Modifications to the Standard." (with J. Stein), submitted for presentation and publication at the 7th International Conference on Hand-Arm Vibration, Umea, Sweden, June 9-12, 1998.

33. "Use of Air Bladder Technology to Solve Hand Tool Vibration Problems." (with T. Jetzer), accepted for presentation and publication at the 7th International Conference on Hand-Arm Vibration, Umea, Sweden, June 9-12, 1998.
 

GRADUATE STUDENT SUPERVISION AT UNLV
 
 1. Analysis of Acoustics in Heating, Ventilating and Air Conditioning Systems, Jeffry M. Bledsoe; Masters Thesis, December 1988,
 
 2. Development of a Test Facility for Making In-Duct Tests According to ASTM E477, David Wade; Masters Thesis, May 1991.
 
 3. Prediction of the Performance Criteria for Passive Heating, Ventilation and Air Conditioning Silencers, Mark Bodie; Masters Thesis, 1993.
 
 4. New Empirical Equations for Calculating Sound Pressure Levels in Rooms, Wen Bo (Paul) Zeng; Masters Thesis, August 1994.
 
 5. Effects of Termination on Acoustic Response of Vibration Attenuating Gloves, Prabhanjan Mysore; Masters Thesis, August 1994.
 
 6. Development of an Automated Throw Room and HVAC Component Acoustic Test System, Michael A. Schwob; Masters Thesis, August 1995.
 
 7. Test and Analysis Methods for Resolving Fan/Motor Vibration Problems in Air-Conditioning Units, Xialoi (Charlie) Teng; Masters Thesis, August 1995 (Selected as the Outstanding Graduate Student Thesis).
 
 8. Development, Modeling, Testing and Evaluation of Vibration Attenuating Gloves, Douglas J. Weaver; Masters Thesis, August 1995.
 
 9. Breakout Sound Transmission Loss of Unlined and Fiberglass-Lined Rectangular and Round Sheet Metal Ducts and Rectangular Fiberglass Ductboard, Keith M. Degner; Masters Thesis, December 1996.
 
 10. Air Friction Pressure Loss Values for Rectangular and Round Fiberglass Duct Products, Alexander J. Jackovich; Masters Thesis, December 1996.
 
 11. Development of an Inexpensive Test System and Evaluation of the Test Procedures for Conducting Vibration Tests on Antivibration Gloves per ISO Standard 10819, Jason K. Stein; Masters Thesis, May 1998.

Grants:

1. Propeller Fan Dynamics - $38,3389. American Society for Heating, Refrigerating and Air-Conditioning Engineeris (ASHRAE) Research Project 266RP; 1981-83.

2. Development of Method to Predict the Vibration Response of Propeller Fans under Actual Operating Conditions - $89,000. American Society for Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Research Project 477-RP; 1985-88.

3. Algorithms for HVAC Acoustics - $49,320. American Society for Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Research Project 556-RP; 1986-90.

4. Development of a Test Facility for Making Insertion Loss Measurements of HVAC Duct Elements - $42,000. Metal Form Corporation, Phoenix, AZ; 1990-91.

5. Vibration and Noise Analysis in Compartment of Data Logging Truck - $34,603. Lawrence Livermore National Laboratory; 1990-91.

6. Design and Development of a Sound and Air Flow Laboratory - $231,852. Hart & Cooley, Holland, MI; 1992-96.

7. Test and Analysis Methods for Resolving Fan/Motor Vibration Problems in air Conditioning Units - $81,802. American Society for Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Research Project 685-RP, 1993-97.

8. Duct Sound Breakout of Rectangular and Round Fiberglass Ducts - $44,000. Schuller International Corporation (Johns Manville), Denver, CO; 1995-96.

9. Air Flow and Acoustical Testing and Analysis of Rectangular and Round Fiberglass Ducts - $44,000. Schuller Internation Corporation (Johns Manville), Denver, CO; 1996.

10. Diagnostic Test and Analytical Methods for Resolving Fan/Motor Vibration Problems in Air-Conditioning Units - $89,994. American Society for Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), (Approved for funding for Summer 1998).