Development of Full-Scale Ultrathin Shell Reflector

Table 1

Comparison of different design cases.

Designs	Frequency, (Hz)								mass (kg)
	Mode 1	Mode 2	Mode 3	Mode 4	Mode 5	Mode 6	Mode 7	Mode 8
case E^a	1.025	1.124	3.362	3.385	6.735	6.775	9.282	9.734	15.91
case E^b	1.110	1.212	3.632	3.654	6.920	6.942	7.712	7.725	11.08
case T^a	0.254	0.274	0.328	0.395	0.407	1.018	1.092	1.097	17.69
case T^b	0.232	0.277	0.295	0.351	0.356	0.796	0.905	1.065	12.86
case D^a	1.515	1.536	2.262	2.475	2.605	3.251	3.612	3.674	17.69
case D^b	1.448	1.461	2.078	2.290	2.328	2.681	2.865	2.914	12.86
case ET^a	1.102	1.190	3.516	3.531	6.789	7.145	9.680	9.796	19.15
case ET^b	1.178	1.260	3.712	3.722	6.925	7.353	8.288	8.479	14.32
case ED^a	2.254	2.314	5.077	5.089	8.306	8.476	9.990	10.18	19.15
case ED^b	2.293	2.342	5.160	5.182	7.972	8.136	8.426	8.635	14.32

^a: reflective surface with three plies, ^b: reflective surface with two plies.