Table 4 Accuracy, variables, and uncertainty of the employed tools.

From: Assessing the impact of novel hybrid floating breakwater-WEC systems on hydrodynamic performance and sustainable energy outputs

Tools

Variables

Accuracy

Ranging

Standard uncertainty

HR Wallingford wave gauges

Height

 ± 0.001 m

-0.5 to + 0.5 m

0.00058 m

Pressure gauge

Pressure

 ± 0.05 bar

up to 50 bars

0.03 bar

Tachometer: Teston DT5350 Digital Hand Tachometer

Shaft rotational speed

 ± 1.0 rpm

20 rpm to

5500 rpm

0.58 rpm

Digital volt-ampere meter

Volt and ampere

 ± 0.01V and ± 0.01 A

DC 0 ~ 100 V and 0 ~ 20 A

5.77 × 10–3 V and A

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