Measuring density and Young’s modulus of a log through the vibration test without measuring its weight

Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 1 Estimation acccuracy of the vibration method with additional mass (VAM) M_VAM/M₀ for the circular truncated cones when the concentrated mass was placed at the butt end or the top end

Diameter of the top end [mm]	Attaching concentrated mass to the butt end							Attaching concentrated mass to the top end
	Concentrated mass							Concentrated mass
	M1	M2	M3	M4	M5	M6	Total	M1	M2	M3	M4	M5	M6	Total
30	1.28	1.05	1.24	0.96	0.94	0.97	5	0.68	0.73	0.60	0.61	0.42	0.55	3
30	1.18	1.12	1.04	0.87	0.76	0.63	5	1.19	1.11	1.02	0.94	0.86	0.96	3
40	1.01	0.86	0.82	0.78	0.69	0.75	2	0.93	0.86	0.85	0.79	0.93	0.74	4
40	1.33	0.86	0.90	0.83	0.68	0.66	2	0.94	0.91	0.86	0.83	0.73	0.69	4
50	1.07	1.22	0.99	0.86	0.74	1.48	2	0.90	0.80	0.79	0.75	0.65	0.82	3
50	0.70	0.89	0.82	0.69	0.70	0.69	2	0.89	0.93	0.83	0.68	0.96	0.73	3
60	0.96	0.83	0.75	0.81	0.80	0.82	3	1.02	0.86	0.88	0.74	0.63	0.61	5
60	1.08	1.29	1.11	0.84	0.74	0.94	3	0.92	0.91	0.97	0.92	0.66	0.81	5
70	1.06	0.95	0.84	0.82	0.76	0.72	4	1.03	0.87	0.89	0.76	0.76	0.69	3
70	0.81	0.90	0.96	0.85	0.75	0.73	4	0.79	0.96	1.07	0.88	0.74	0.77	3
80	0.44	0.49	0.92	0.84	1.08	1.38	4	0.64	0.67	0.88	0.95	0.63	0.60	2
80	0.96	0.96	0.87	0.80	0.70	0.69	4	0.97	0.83	0.84	0.74	0.81	0.64	2
90	0.95	0.86	0.98	0.84	0.70	0.73	5	0.98	0.90	0.85	0.81	0.71	0.69	3
90	1.64	0.90	0.96	0.94	0.86	0.70	5	1.49	0.97	0.81	0.86	0.66	1.12	3
Total	7	5	7	2	2	2		8	6	3	3	2	1

M_VAM: Estimated mass by the VAM, M₀: Mesasured mass, Upper row of the same diameter: Specimen 1, Lower row of the same diameter: Specimen 2, Total: Total number of occurrences of 0.9 ≤ M_VAM/M₀ ≤ 1.1