PRACTICAL, INDUSTRIAL VIBRATION ENERGY HARVESTING Dr. Adam Wasenczuk Perpetuum Ltd. Southampton Science Park Hampshire, UK
What is energy harvesting? Vibration Electrical Power Wireless condition monitoring of equipment
Microgenerator concept Unlimited energy from ambient vibration Fully enclosed unlike wind, solar etc. Mass Suspension Transducer
Application: condition monitoring 1. To identify failure (diagnosis) No signal Overtemperature 2. To identify impending failure (prognosis) Downtime Accident prevention Consequential damage 3. To know why failure occurs Pull the machine from service Analyse the incipient failure Change what you’re doing
Value of condition monitoring Design Materials Manufacture Service Condition monitoring Failure! Analysis
Size of market How many different condition monitoring points can you see in this picture?
Condition monitoring: issues People Take readings Maintain sensors Location Hazardous environment Remote locations Enclosures, assemblies, concrete… Cables Retrofit wiring looms?
Example environment: ATEX Explosive atmospheres Design constraints Stored energy Maximum available power, voltage, current Component redundancy Hermetic seal Case materials
PMG17
Wireless enabling technology Radio 802.15.4: low-power short range SMS text messaging: low bandwidth long range Energy harvesters = unlimited energy Energy harvesters = Zero maintenance
Vibration condition monitoring Acquire, process, transmit Measure vibration Fourier transform Extract trends Alarm Bandwidth - intensive Processor - intensive
System Generator μP Rectifier Radio Air Reciever Storage G-sensor Database Regulator T-sensor Alarm!
Performance (1): specification 0.6 mW @ 25mg 2Hz bandwidth Post-rectification 40 mW @ 1g large bandwidth > 32dB dynamic range -40C +85C 55 x 55mm cylinder M.T.T.F. > 10 yr.
Performance (2): induction motors
Performance (3): vehicles 3mW … Vibration x Response
Performance (4): endurance Highly Accelerated Life Testing Before production, but on production devices Thermal shock Vibration and mechanical shock Aim: break it! 3. To know why failure occurs Pull the machine from service Analyse the incipient failure Change what you’re doing
In conclusion Power from vibration Wireless condition monitoring Practical energy source Well-characterised Wireless condition monitoring Real installed systems in difficult environments