Research at the Ray W. Herrick Laboratories

The three areas of research at the Laboratories are noise and vibration control, thermal systems and electromechanical systems.  Cutting across these areas are research themes and applications: prognostics and diagnostics, perception-based engineering, engines and exhaust systems, and transportation.  The faculty are also involved in a number of centers and they collaborate with people in a wide variety of disciplines, some are given below.   The research at the laboratories is focused on energy, the environment and quality of life (comfort) as well as the development of reliable systems. For a list of current projects and a list of faculty research interests click here.

Noise and Vibration Control more info...

  • Environmental Acoustics: propagation and transmission
  • Measurement and Signal Processing Techniques, Acoustical Holography, Array Measurements
  • Numerical Analysis and Design Techniques
  • Product Sound Quality
  • Community Response to Noise (Annoyance, Sleep Disturbance, Speech Interference, etc.)
  • Modeling and Design of Acoustical Materials and Treatments
  • Microperforated Sound Absorbers
  • Active Noise and Vibration Control
  • Tire Noise
  • IT and AV Equipment Noise Control
  • Fan Noise
  • Brake Squeal
  • Friction Induced Vibration
  • Modeling of nonlinear viscoelastic material elements in dynamic systems
  • Vibration and quasi-static settling behavior of seat-occupant systems
  • Modeling and Design of Mechanical and Electromechanical Amplifiers 
  • Aeroacoustic Noise

Electromechanical Systems

  • On-line, Intelligent Control and Engine Diagnostics
  • Advanced Data Analysis and System Identification
  • Microprocessor Control Applications
  • Nonlinear Adaptive Robust Control Techniques
  • Control of Electro-Hydraulic Systems
  • Model based fault detection and fault tolerant controls

Prognostics and Diagnostics more info...

  • Thermal systems equipment condition monitoring
  • Energy efficient maintenance scheduling
  • Structural health monitoring: applications include off-road military vehicles, suspension systems, aircraft, spacecraft, cabling systems, wind turbines
  • Combustion misfire detection

Affiliations and Collaborations


Interdisciplinary Faculty Collaborations

  • Speech Language and Hearing Sciences: Purdue & CUNY. Beth Strickland, Michael Heinz, Josh Alexander
  • Psychological Sciences: Purdue & Memorial University. Robert Proctor,  Zyg Pizlo
  • Health Sciences and Kinesiology: Shirley Rietdyk
  • Electrical Engineering: Hong Tan, Steve Pekarek, Jan Allebach, Ed Delp, Jianghai Hu   
  • Biomedical Engineering: George Wodicka, Michael Heinz
  • Electrical and Mechanical Engineering Technology: Mark French, Davin Huston, Haiyan (Henry) Zhang 

Thermal Systems more info...

Work in this area is focused on energy utilization, environmentally friendly refrigeration, and building control to increase comfort and reduce energy consumption. Topics include

  • Reliability and Performance of Postive Displacement Compressors (up to 250 hp)
  • Alternative and Natural Refrigerants
  • Alternative Cooling Cycles
  • Small and Large Scale Building Systems Modeling and Control
  • Alternative Energy Sources for Interior Space Conditioning
  • Energy Utilization and Control of Thermal Systems
  • Indoor Air Quality
  • Thermal Comfort
  • HVAC&R Condition Monitoring and Diagnostics
  • Component and System Modeling
  • Compressor Design
  • Small Scale Cooling Devices
  • Sensors
  • Airflow in and around buildings
  • Environmental control systems
  • Indoor environment

Automotive & Transportation Research more info...

  • Fault detection in suspension systems and tires
  • Engine controls (see below)
  • Identification and control of after-treatment system behavior (see below)
  • Acoustical treatments for aircraft and road transportation
  • Measurement and modeling of rattle and squeal phenomena
  • Aeroacoustic noise: sun roofs, wing mirrors, seals
  • Tire dynamics, road-tire interactions and pavement noise
  • Speech intelligibility for aging drivers
  • Sound quality of motor-driven automotive components
  • Community impact of environmental noise from aircraft, road transportation and trains
  • Vibration modeling of automotive systems: suspension systems; exhaust systems; seat-occupant systems
  • Fuel cell modeling, diagnostics, and control

Engines and Exhaust Systems more info...

  • Physics-based closed loop control of multi-cylinder Homogenous Charged Compression Ignition (HCCI) 
  • Clean and efficient utilization of alternative fuels (biodiesel, ethanol, Fischer-Tropsch) via estimation and accommodation of variable combustion behavior across fuel type, blend ratio, and feedstock
  • Emissions and after-treatment system modeling, diagnosis and control, e.g, particulate trap monitoring 
  • Hybrid engine controls
  • Sound quality of diesel engine noise
  • Experimental techniques to develop source and propagation path acoustics models of diesel engine noise
  • Electronic fuel injection for single-cylinder diesel engine to reduce noise

Perception-Based Engineering more info...

  • Modeling of Sound Perception
  • Sleep Disturbance, Annoyance
  • Effects of Noise on Aging Populations
  • Performance and Perception in Noisy Environments
  • Driving Safety and Highway Design
  • Image Perception and Image Quality
  • Haptics: interface design, communications
  • Multi-modal interactions: Visual and Acoustic; Acoustic & Vibratory; Visual and Haptic
  • Vibration Perception and Vibration Quality
  • Sound Quality
  • Thermal Comfort and Air Quality Impacts