Vibrations induced in wheeled equipment by curved protrusions on guide blocks for the visually impaired

Figures & data

Table 1. Cross-sectional shapes of the 10 test specimens evaluated in this study.

		Width (mm)
		13.5	27.0	40.5
Height (mm)	2.5	W13.5 H2.5	W27.0 H2.5	W40.5 H2.5
	5.0	W13.5 H5.0	W27.0 H5.0	W40.5 H5.0
	7.5	W13.5 H7.5	W27.0 H7.5	W40.5 H7.5
JIS			JIS

Figure 1. Specifications of the bogie vibration measurement device proposed by the floor Construction Working Group of the Architectural Institute of Japan, YukaKoji WG (2020a, 2020b).

Figure 2. Experimental setup.

Figure 3. An example vibration level (L_V) measurement (27.0 mm wide by 5.0 mm high curved specimen shown).

Figure 4. Comparison of the average maximum vibration level (L_Vavg.max) values.

Figure 5. Relationship between the width of the curved protrusion and average maximum vibration level (L_Vavg.max).

Figure 6. Relationship between the height of the curved protrusion and average maximum vibration level (L_Vavg.max).

Figure 7. Relationship between the bogie passing speed and average maximum vibration level (L_Vavg.max).

Table 2. Multiple comparisons of L_Vavg.max (using the JIS specimen at a passing speed of 400 mm/s as the Group 1 basis).

Kruskal–Wallis Test: Chi-square 290.2495, df 9, p < 0.001**
Group 1	LVavg.max difference^†	Group 2	Test statistic	p
JIS	>	W13.5 H2.5	6.6687	<0.001**
	NS	W13.5 H5.0	0.3829	0.9999
	<	W13.5 H7.5	6.6776	<0.001**
	>	W27.0 H2.5	6.6680	<0.001**
	>	W27.0 H5.0	6.2884	<0.001**
	<	W27.0 H7.5	6.6169	<0.001**
	>	W40.5 H2.5	6.6802	<0.001**
	>	W40.5 H5.0	6.6970	<0.001**
	<	W40.5 H7.5	6.4903	<0.001**

^†The symbols <, >, and NS, represent large, small, and not significant differences, respectively

Test statistic: Calculated by the Dunnett test

Significance: *< 0.01, **< 0.001

Table 3. Multiple comparisons of L_Vavg.max at different speeds for the JIS specimen and the 27.0 mm wide by 5.0 mm high curved specimen (using the JIS specimen at a passing speed of 400 mm/s as the Group 1 basis).

Kruskal – Wallis Test: Chi-square 165.9283, df 5, p < 0.001**
Group 1	LVavg.max difference^†	Group 2	Test statistic	p
JIS 400 mm/s	>	JIS 200 mm/s	6.6794	<0.001**
	<	JIS 600 mm/s	6.6681	<0.001**
	>	W27.0 H5.0 200 mm/s	6.6835	<0.001**
	>	W27.0 H5.0 400 mm/s	6.2884	<0.001**
	<	W27.0 H5.0 600 mm/s	6.6690	<0.001**

^†The symbols <, >, and NS, represent large, small, and not significant differences, respectively

Test statistic: Calculated by the Dunnett test

Significance: *< 0.01, **< 0.001

Table 4. Multiple comparisons of L_Vavg.max (using the 27.0 mm wide by 5.0 mm high curved specimen at a passing speed of 400 mm/s as the Group 1 basis).

Kruskal – Wallis Test: Chi-square 290.2495, df 9, p < 0.001**
Group 1	LVavg.max difference^†	Group 2	Test statistic	p
W27.0 H5.0	>	W13.5 H2.5	6.6614	<0.001**
	<	W13.5 H5.0	6.0396	<0.001**
	<	W13.5 H7.5	6.6777	<0.001**
	>	W27.0 H2.5	6.6681	<0.001**
	<	W27.0 H7.5	6.6744	<0.001**
	>	W40.5 H2.5	6.6803	<0.001**
	>	W40.5 H5.0	5.3728	<0.001**
	<	W40.5 H7.5	6.6819	<0.001**
	<	JIS	6.2884	<0.001**

^†The symbols <, >, and NS, represent large, small, and not significant differences, respectively.

Test statistic: Calculated by the Dunnett test.

Significance: *< 0.01, **< 0.001.

Table 5. Multiple comparisons of L_Vavg.max at different speeds for the JIS specimen and the 27.0 mm wide by 5.0 mm high curved specimen (using the 27.0 mm wide by 5.0 mm high curved specimen at a passing speed of 400 mm/s as the basis).

Kruskal – Wallis Test: Chi-square 165.9283, df 5, p < 0.001**
Group 1	LVavg.max difference^†	Group 2	Test statistic	p
W27.0 H5.0 400 mm/s	>	JIS 200 mm/s	6.6795	<0.001**
	<	JIS 400 mm/s	6.2884	<0.001**
	<	JIS 600 mm/s	6.6682	<0.001**
	>	W27.0 H5.0 200 mm/s	6.6836	<0.001**
	<	W27.0 H5.0 600 mm/s	6.6691	<0.001**

^†The symbols <, >, and NS, represent large, small, and not significant differences, respectively.

Test statistic: Calculated by the Dunnett test.

Significance: *< 0.01, **< 0.001.

Architectural Institute of Japan, YukaKoji WG. 2020a. “Floor Performance Evaluation Method and Performance Items with Recommended Values.” Accessed April 25, 2023. http://news-sv.aij.or.jp/zairyou/s10/YKWGindex1.html.

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Architectural Institute of Japan, YukaKoji WG. 2020b. “Vibration When Casters are Running.” Accessed April 25, 2023. http://news-sv.aij.or.jp/zairyou/s10/pdf/caster_shindou.pdf.

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