Used for structural pavement testing in confined or hard‑to‑access environments, the TMD performs stationary Falling Weight Deflectometer (FWD) measurements where trailer‑based systems are impractical.
The Truck Mounted Deflectometer (TMD) is a truck-integrated Falling Weight Deflectometer (FWD) designed for structural pavement testing when trailer-mounted systems are impractical. It performs stationary “drop-and-measure” deflection drop tests (like a standard FWD) at designated points, delivering high-precision data on pavement structural capacity with no sacrifice of deflection bowl coverage or measurement precision.
This compact FWD platform excels in confined or hard-to-access environments – e.g., narrow city streets, winding mountain roads, remote project sites – where maneuvering a trailer is challenging. By removing the need for a separate trailer and extra crew, the TMD provides road authorities and engineering consultants a compact, one-person FWD testing platform that simplifies logistics and improves safety.
You need it when:
Space or access is limited: Performing structural testing on narrow roads, urban areas, or confined job sites where a trailer-based FWD cannot fit or navigate safely.
Simplifying operations: Deploying an FWD test with a single vehicle and operator, eliminating the need for special trailer handling or extra crew (and improving safety by reducing roadside exposure).
Targeted surveys for maintenance planning: Gathering deflection data on road networks or project sites where standard trailer FWD deployment is impractical, ensuring reliable structural insights to prioritize repairs.
To maximize product lifespan, Dynatest enhanced the vehicle design to enable relatively simple conversion to a new vehicle at the completion of the original vehicle life cycle, or to a trailer-mounting if preferred. The Dynatest Truck Mounted Deflectometer (TMD) is particularly suitable for test environments requiring overall shorter length testing platforms (without losing deflection bowl coverage) or in which stand-alone vehicle purchases or vehicle-trailer operations are problematic.
As with the other members of the Dynatest Deflectometer product lines (FWD & HWD), the TMD provides fully automated, fast, and precise measurements suitable for use with standard analysis and design procedures including especially rigorous mechanistic-empirical analysis of pavement structures such as the proprietary Dynatest ELMOD (Evaluation of Layer Moduli and Overlay Design) program.
Dynamic loading enables mechanistic-empirical analysis of the pavement layers to determine optimal reconstruction strategies
Automated and rapid structural pavement testing
Determines the layer of failure, rather than determining simply the bearing capacity
QA/QC of newly built pavements
Compares a range of repair options, including plane off and recycling rather than just applying overlays
The use of the TMD provides accurate, reproducible, and repeatable structural data
Automated and real-time monitoring of the load cell, geophones, and data variations ensures high quality of collected data
Uses mechanistic-empirical analysis applicable to most of the pavement structures
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