Technical information

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Figure 4.3.4: Layout of N1 gauge array (refer to Figure 2.4.3) and travel path
positioning of the center point of the rightmost truck tire (connecting
arrows) ........................................................................................................................ 4-21
Figure 4.3.5: Travel paths of center of rightmost truck wheels over the N1 gauge array
at NCAT for the different axles in Table 2.1.1 ........................................................... 4-22
Figure 4.3.6: Calculated and measured N1 responses - right side of steering axle (1S) ............ 4-24
Figure 4.3.7: Calculated and measured N1 responses - right side of drive axle (1D and
2D) .............................................................................................................................. 4-25
Figure 4.3.8: Calculated and measured N1 responses - right side of first trailer axle
(1T) ............................................................................................................................. 4-26
Figure 4.3.9: Calculated and measured N1 responses - right side of third trailer axle
(3T) ............................................................................................................................. 4-27
Figure 4.3.10: Calculated and measured N1 responses - right side of last trailer axle
(5T) ............................................................................................................................. 4-28
Figure 5.1.1: User interface of the anisotropic LET program ELLEA2 ...................................... 5-8
Figure 5.1.2: ELLEA2 display of property and algorithm restriction for the example
shown in Figure 5.1.1 ................................................................................................... 5-8
Figure 5.1.3: Comparison of measured resilient responses in the APT during pass
#5,000 with responses computed using the anisotropic layered model
(isotropic case is reproduced from Figure 4.2.2) ........................................................ 5-12
Figure 5.1.4: Comparison of measured peak FWD deflections at NCAT N1 with
projected peak deflections using anisotropic LET (isotropic case reproduced
from Figure 4.3.3) ....................................................................................................... 5-14
Figure 5.1.5: Comparison of anisotropic LET projections with measured N1 responses
- right side of steering axle (1S). Isotropic case reproduced from Figure
4.3.6 ............................................................................................................................ 5-16
Figure 5.1.6: Comparison of anisotropic LET projections with measured N1 responses
- right side of third trailer axle (3T). Isotropic case reproduced from Figure
4.3.9 ............................................................................................................................ 5-17
Figure 5.2.1: Scheme for simulating a moving load on a layered viscoelastic model .............. 5-22
Figure 5.2.2: Indicial admittance of a layered viscoelastic system (example). Strain
response due to a unit intensity ‘input’ of an APT half-axle passing along
four offset distances from the evaluation point .......................................................... 5-24
Figure 5.2.3: Comparison of backcalculated relaxation modulus with that
interconverted from complex modulus test results ..................................................... 5-28
Figure 5.2.4: Comparison of measured resilient responses in the APT during pass
#5,000 with responses computed using the isotropic viscoelastic layered
model .......................................................................................................................... 5-30
Figure 5.2.5: Comparison of isotropic LVT projections with measured N1 responses -
right side of steer axle (1S). Isotropic case reproduced from Figure 4.3.6 ................. 5-33