Development of Surface Roughness Standards for Pathways Used by Wheelchair Users: Final Report
Engineered Surfaces
The engineered surfaces consisted of a 16ft x 4ft runway with a 4ft x 4ft flat platform on each end. (Figure 3) The 16ft test area was constructed with two rows of 48 pieces of 3/4in poplar hardwood separated at 4in intervals. The board configurations resulted in gaps of 0in, 0.8in, 1.25in, 1.55in and 2.00in. These gaps were chosen so that there was a large range of surfaces that would result in vibrations and questionnaire results that would span the range necessary for the study. The surface configurations are described in Table 3. The roughness index is a measurement how much vertical deviation a standard wheel will experience as it travels over these surfaces and will be explained in more detail later on.
Table 3: Engineered Surface Identification
|
Surface ID: |
Roughness Index (in/ft): |
Crack Frequency (in): |
Crack Width (in): |
|
1 |
0.2052 |
No cracks |
0 |
|
2 |
0.3087 |
12 |
0.80 |
|
3 |
0.3827 |
8 |
0.80 |
|
4 |
0.5717 |
12 |
1.25 |
|
5 |
0.5783 |
4 |
0.80 |
|
6 |
0.7184 |
8 |
1.25 |
|
7 |
0.9211 |
8 |
1.55 |
|
8 |
1.2132 |
4 |
1.25 |
|
9 |
1.5449 |
8 |
2.00 |
Figure 3: Pictures of wooden surfaces
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