Performance Improvement of Membrane Stress Measurement Equipment through Evaluation of Added Mass of Membrane and Error Correction

Table 4

Result of the Type A membrane material under setup stress of ( = target stress).

Case			Estimation stress (kN m^−1)		Considering added mass of membrane
	( = target stress)
	Setup stress (kN m^−1)				Estimation stress (kN m^−1)		Error of stress (kN m^−1)		Error ratio (%)
	1	1.40	0.86	1.16	0.72	1.41	0.88	−0.01	−0.02	−0.71	−2.33
2	2.14	1.59	1.74	1.22	2.11	1.47	0.03	0.12	1.40	7.55
3	2.94	2.36	2.35	1.74	2.85	2.11	0.09	0.25	3.06	10.59
4	4.09	3.38	3.00	2.50	3.63	3.03	0.46	0.35	11.25	10.36
5	4.95	4.26	3.69	3.13	4.46	3.78	0.49	0.48	9.90	11.27
6	5.86	5.13	4.33	3.60	5.22	4.34	0.64	0.79	10.92	15.40
7	6.84	6.09	4.98	4.09	6.00	4.94	0.84	1.15	12.28	18.88
8	7.75	7.01	5.18	4.86	6.23	5.86	1.52	1.15	19.61	16.41
9	8.75	7.96	5.67	5.18	6.82	6.23	1.93	1.73	22.06	21.73
10	9.78	8.98	5.92	5.82	7.12	6.99	2.66	1.99	27.20	22.16
11	10.82	10.06	6.61	6.07	7.93	7.29	2.89	2.77	26.71	27.53
12	11.81	11.11	6.47	6.35	7.77	7.63	4.04	3.48	34.21	31.32
13	12.67	11.99	6.94	6.64	8.83	7.96	4.34	4.03	34.25	33.61
14	14.26	13.57	7.07	7.23	8.47	8.67	5.79	4.90	40.60	36.11
15	14.86	14.16	7.29	6.89	8.74	8.26	6.12	5.90	41.18	41.67
16	15.53	14.87	7.41	7.11	8.88	8.52	6.65	6.35	42.82	42.70
17	16.98	16.35	6.88	7.53	8.25	9.02	8.73	7.33	51.41	44.83
18	18.24	17.62	7.52	7.52	9.01	9.01	9.23	8.61	50.60	48.86
19	18.64	18.04	7.84	7.30	9.40	8.74	9.24	9.30	49.57	51.55
20	19.69	19.07	7.57	7.30	9.07	8.75	10.62	10.32	53.94	54.12
Average							3.82	3.55	27.11	27.22
Standard deviation							3.48	3.28	17.64	16.03