Wireless Structural Health Monitoring Small Sensors, Big Difference

Protecting Infrastructure with 21st Century Technology Resensys SenSpot™ sensors monitor 10,000-foot Robert Norris Bridge, Virginia

Resensys Wireless SenSpot™ Wireless SenSpot™ sensors offer a breakthrough technology for realtime and long-term structural health monitoring. Sample applications of SenSpot™ sensors : • Bridge piers and abutments: monitoring tilt, horizontal displacement, settling, deflection, instability of foundation • Structural elements: monitoring strain (stress) in girders, beams, truss members, detecting overstrain, fatigue • Bearings and expansion joints: monitoring bearing tilt, movement of joints, temperature response, detecting bearing malfunction • Bridge load rating: fast, easy, reliable load carrying...

Displacement SenSpot™ (monitoring expansion, crack progression) Resensys Remote Monitoring System • SenSpot™ sensors: attached to the structure, any number, any combination • SeniMax™: collects data from on-site SenSpot™ sensors and sends it to a remote server (one unit can cover up to 250 SenSpot™). • Repeater: extends the range of SenSpot™ sensors when needed (in very large structures). • SenScope™: software for sophisticated data analysis, visualization. Tilt SenSpot™ (monitoring pier movements, foundation settling, bearing movement) Cloud / Server Storage Internet SeniMax™ Remote Transmission...

Resensys SeniMax™ Gateway SeniMax™ receives data from SenSpot™ sensors and transmits data to a cloud based database system. SeniMax™ is a high performance wireless data collector and remote communication gateway designed for years of uninterrupted and reliable monitoring. SeniMax™ uses Resensys's proprietary breakthrough energy efficient communication and scheduling technology. As a result, even when it is disconnected from solar cells, it still has a full month of energy reserve for reliable operation. SeniMax™ Features Energy self sufficient: solar powered Wireless protocols: IEEE 802.15.4 HSPA...

Resensys SenScope™ Software SenScope™ is a software package for real-time monitoring and structural diagnosis. SenScope™ is capable of converting large volumes of data into specific structural diagnostics information. The information generated by SenScope™ facilitates decisionmaking and accelerates the course of action for maintenance/repair. SenScope™ features • Communication with Resensys SenSpot™ and SeniMax™ • Real-time data visualization and management • Automated structural diagnostics, alert generation & management • Alert generation with customizable alert levels • Archiving of historical...

Strain SenSpot™ Game-changing technology for monitoring strain, fatigue damage awareness, and load rating • Long- term and continuous monitoring of strain (stress) • Detecting short-lived and transient high-strain events, e.g., caused by fast moving trucks on highway bridges or by turbulence on airframes • Fatigue awareness, fatigue life analysis (remaining useful life estimation) • Fast, easy-to-install adhesive mount • Examples applications:  Highway bridges  Airframes  Pipelines  Machines, cranes, etc.  Truck tests, bridge load rating The 8-second “zoomed in” data shows the loading effect...

Tilt/Inclination SenSpot™ A breakthrough tool for precise monitoring of tilt, inclination, settling, bending, deformation, and deflection • Monitoring deflection, bending, settling of piers, abutments at high precision (resolution 0.00016 degree or 0.5 arc seconds) • Monitoring vertical/ horizontal displacement in spans, pylons, piers using analytical model • Detecting change in tilt caused by settling, deformation, or permanent change in loading. • Detecting any over-tilting or unhealthy change in tilt that may affect overall safety of the structure. Using Resensys’s high precision tilt SenSpot...

Monitoring bearings and girders • Bearings are designed to accommodate the expansion and contraction of a bridge deck and superstructure as a result of temperature change. • Accumulated stress as a result of malfunctioning bearings can damage a structure by forming fatigue cracks in steel, piers, and abutments. • Resensys SenSpot™ sensors provide accurate information about tilt, temperature and strain on bridge bearings; the system can detect instances where the bearings are partially or completely frozen. • As a secondary measurement, in addition to the tilt SenSpot™ sensors on bearings, strain...

Displacement SenSpot™ • Monitors expansion joints • Monitors activity / propagation of existing cracks. • Monitors movement Vibration SenSpot™ • Monitors single axis or tri-axial acceleration • Calculates natural frequencies/ modal analysis • Detects shift in natural frequencies RESENSYS PRODUCTS

Monitoring buildings: settling, vibration, crack • Displacement SenSpot™ is used for measurement and progress of the existing cracks in a structure. This device has a sliding element which moves with displacement of structure or growth of a crack. • Inclination/Tilt SenSpot™ is used to monitor smallest movements in walls or floors caused by settling in foundation. • Humidity/Temperature SenSpot™ reports environmental conditions. Seismic activity waveform reported by a Resensys vibration SenSpot™. The device detected an earthquake on December 30, 2015 in British Columbia, Canada. Other Applications:...

A breakthrough method for fast and accurate bridge load rating: 1. Attach adhesive mount wireless strain SenSpots™ to critical members (e.g., beams, girders, truss members, gussets); 2. Drive truck of known weight over the bridge; 3. Calculate load carrying capacity using the responses Strain peaks on various members caused by test truck RateStrain) Rate_Strain) >_Rate_Strain) Rate_Strain) _Rate_Slrain) _Rate_Strain) i_Rate_Strain) Rate_Strain) Rate_Strain) _Rate_Slrain) _Rate_Strain) Rate_Strain) Rate_Strain)