Firmness Evaluation by Drop Impact Characteristics for Peach

Figures & data

Figure 1 The schematic diagram of the experimental system.

Figure 2 Typical time domain and frequency domain characteristic for drop height. (Firmness 0.98–1.01MPa)

Figure 3 Typical frequency domain characteristic for drop height. (Firmness 1.79–1.81MPa)

Figure 4 Typical frequency domain characteristic for peach orientation. (Peach mass 98–100g, firmness 1.80–1.83MPa)

Figure 5 Typical frequency domain characteristic for material of impact surface. (Peach mass 99–103g, firmness 2.20 ± 0.02MPa)

Figure 6 Typical frequency domain characteristic for fruit mass. (Peach firmnesses 1.05–1.08MPa)

Figure 7 Typical frequency domain characteristic for fruit firmness. (Peach mass 103–107g)

Figure 8 Typical frequency domain characteristic for storage day. (Peach mass 90–93g)

Table 1 F-values from STAT/ANOVA on the effects

Source	Peach orientation	Drop height	Materials of impact surface	Peach mass	Peach firmness	Storage day
Degrees of freedom	3	1	2	2	2	3
F-value	1.35	1.43	0.98	30.86 ^a	76.31 ^a	70.46 ^a
^asignificant at probability P < 0.05 level.

Figure 9 Relationship between dominant frequency and M-T firmness. (Peach mass 102–105g)

Fgirue 10 Relationship between dominant frequency and peach mass. (Peach firmnesses 0.76–0.80MPa)

Figure 11 Relationship between stiffness coefficient and M-T firmness.