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Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 4 The list of estimation accuracy

From: Influence of moisture content on estimating Young’s modulus of full-scale timber using stress wave velocity

Measurement point

n a

V a(e)/V a(o)

ρ a(e) V a(e) 2/ρ a(o) V a(o) 2

ρ a(e) V a(e) 2/MOEa(o)

ρ 15(e) V 15(e) 2/ρV 2 15(ASTM)

ρ 15(e) V 15(e) 2/MOE15(ASTM)

E ma(e)/ρ a(o) V a(o) 2

E ma(e)/MOEa(o)

E m15(e)/ρV 2 15(ASTM)

E ma(e)/MOE15(ASTM)

Pith

32

1.00

1.00

1.09

1.02

1.11

1.06

1.15

1.08

1.17

(0.04)

(0.09)

(0.12)

(0.09)

(0.12)

(0.15)

(0.17)

(0.16)

(0.18)

Mature wood

32

1.00

1.01

1.14

1.02

1.16

1.05

1.19

1.06

1.20

(0.05)

(0.10)

(0.12)

(0.10)

(0.12)

(0.15)

(0.16)

(0.16)

(0.18)

Average

32

1.00

1.01

1.14

1.02

1.16

1.05

1.19

1.06

1.20

(0.05)

(0.10)

(0.12)

(0.10)

(0.12)

(0.15)

(0.16)

(0.16)

(0.18)

Overall

96

1.00

1.00

1.12

1.02

1.13

1.06

1.17

1.07

1.19

(0.05)

(0.09)

(0.12)

(0.09)

(0.12)

(0.15)

(0.17)

(0.16)

(0.18)

  1. Standard deviation is given in round brackets
  2. Subscripts of “a”, “15”, “(e)”, “(o)” and “(ASTM)” mean “moisture content after drying”, “moisture content of 15%”, “estimated value”, “observed value” and “observed value collected by ASTM method [21]” (see Table 1)
  3. E m means Young’s modulus estimated using Monte Carlo simulation (see Table 1) and MOE means modulus of elasticity in bending
  4. a n means number of analyzed data set
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