World-Class Research

Herrick Labs focuses on several areas, themes, and applications for research. They include:

Research in the HVAC & Refrigeration Area and Living Labs is focused on energy utilization, environmentally friendly refrigeration, and building control to increase comfort and reduce energy consumption. Topics include:

The Acoustics, Noise, and Vibration Research Area and High-Bay Flexible Lab host many aspects of acoustic and vibration research, including:

  • 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
  • Click here for a complete overview and list of theses in Acoustics, Noise Control, and Vibration (PDF)

Work in the Perception-Based Engineering Lab focuses on people's perceptions of stimuli, and their influence on satisfaction, comfort, annoyance and performance. This includes:

  • 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
  • Click here for a complete overview and list of theses in Perception-Based Engineering (PDF)

Work in the Engine Test Cells focuses on performance and fuel efficiency:

  • 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
  • Click here for a complete overview and list of theses in Engine Research (PDF)

Much of the work in the Acoustics Lab, Engine Lab, and Perception-Based Lab focuses on cars, trucks, airplanes, and other vehicles. This includes:

  • Fault detection in suspension systems and tires
  • Identification and control of after-treatment system behavior
  • 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

An overarching theme of Herrick's research is systems diagnostics, whether it's about buildings, engines, or people. This includes:

  • 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
  • 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
  • Click here for a complete overview and list of theses in Prognostics and Diagnostics (PDF)

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 

Learn more about the labs where this research takes place:

Herrick Labs  •  177 S. Russell St., West Lafayette, IN 47907  •  (765) 494-2132  •  herricklabs@purdue.edu