The results of measuring the length of the deflection of the pressure plate, the pressure in the range 0-18 kPa, as shown in Figure 4.5 shows that during the period from 0 to 0.15 mm, the deflection of the pressure plate. The results are consistent with those obtained from methodological, analytical and values of simulation software COMSOL, but when the term of deflection is greater value from the methodological analysis differs from. From the model Because of equation of time deflection by methodological analysis is derived from the analysis under the assumption that the length of the deflection of the plate, the pressure is less (small deflection) by no more than half. The thickness of the pressure or approximately 0.154 mm (thickness sheets 0.307 mm), so the length of the deflection, the more value, the value of regulation analysis will deviate more and inconsistent with the values provided by the model. SIMULATION
Also during pressure greater than 10 kPa term deflection of the pressure plate of trials is greater than the value obtained from the model. Due to the fact that when the pressure was more valuable. Mounting base plate, pressure will feature a mix between a fixed support and a simple support [19] While the value of the model is the bracket is fixed support, thus allowing the length of the deflection of the panels. As a result, the pressure is higher than that of model
calibration graph from 0- 17.4 kPa pressure over the output voltage tends to increase as the pressure increases. For use in a range 0 - 8.7 kPa relationship between voltage output and pressure is linear and the sensitivity of 1.5 mV / V / kPa and an error equal to 3.28% FSO. The steel joist. Table calculation error of pressure against the 0- 17.4 kPa pressure in Table 4.4.
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