Table 1.

Parameters of the NAMs

Para.	a (mm)	b (mm)	h (mm)	m O (g)	m r (g)	m J (g)
1D	120	20	3.8	15	10	9
2D	80	–	2	8	10	9
Para.	Δ (mm)	l r (mm)	l J (mm)	l s (mm)	r s (mm)	λ f (m)
1D	12.5	20.5	45	70	1.9	1.074
2D	12	20	40	70	1.9	0.805

Here λ _f denotes the flexural wavelength at 30 Hz