2017.06.19 FwdMan2.8.17.docx 1-3
An IBM compatible computer like e.g., a Notebook or Laptop type PC with Windows.
The FwdWin field data collection program.
1.3.1 The FWD/HWD Mechanics
By means of a falling weight striking a specially designed rubber spring system, a Dynatest
FWD/HWD produces an essentially half-sine shaped, single “impact” load of 25-30 msec in
duration, closely approximating the effect of a moving wheel load of up to 120 kN (27,000
lbf) (optionally 150 kN (33,000 lbf)) for the FWD/VMD or 240 kN (59,000 lbf) (optionally
300 kN (66,000 lbf)) for the HWD.
Peak load range 7 to 120 (opt. 150) kN (1,500 to 27,000 (opt. 33,000) lbf) for the 8000
FWD or the VMD
Peak load range 30 to 240 (opt. 300) kN (6,500 to 54,000 (opt. 66,000) lbf) for the 8081
HWD
Light weight, trailer or van mounted. Trailer versions may be towed by an ordinary
passenger automobile or van.
Height of trailers less than 1.5 m (58”) in transport as well as measuring mode, low centre
of gravity, stable at normal highway speeds.
Centre mounted load cell, integrated with the loading plate and swivel suspended.
7 (optionally up to 15) seismic deflection transducers, in movable holders along a 2.45 m
(8 ft) raise/lower bar, for precise deflection basin measurements.
Automatic, remote controlled operation (including falling height selection) by one person
(the driver).
A typical testing sequence in one measuring point is performed in less than 40 seconds
(HWD: 50 secs.)
Weather resistant (–20C to +50C (–5F to +122F)) for all components located outside the
towing vehicle.
12V DC power requirement only, heavy duty buffer battery supply provided.
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