Vibration damage on guava peel is an important criterion for fruit grading classification and consumer perception. Response surface methodology (RSM) using central composite design (CCD) with three independent variables as frequency (7, 13.5 and 20 Hz), vibration duration (15, 30 and 45 min), and acceleration (2.942, 5.884 and 8.826 m s⁻²) were employed for vibration testing of ‘Glom Sali’ guava. Twenty simulated vibration treatments were conducted at 20 °C for 48 h to assess and analyze browning index (BI), total color difference (TCD), digital image analysis of bruise area (BA) and normalized fractal dimension difference (ΔFD/FD₀) for vibration bruising damage on guava peel. Results showed that acceleration was an important factor in vibration bruising, particularly combined at 8.826 m s⁻². For a fixed target value of ΔFD/FD₀ at 1.088 and BA at 10 % of the total area, the optimized treatment condition was frequency level 13.5 Hz, vibration duration 30 min and acceleration level 6.570 m s⁻². The correlation coefficient (r) between TCD and either BA (0.7724) or ΔFD/FD₀ (0.7484) showed a higher relationship than BI (0.4605), while ΔFD/FD₀ value had greater reliability and repeatability than BA to predict vibration bruising in guava. Results demonstrated that fractal dimension difference assessed by image analysis was a potential methodology to determine the severity of vibration bruising in guava fruit.

番石榴果皮的振动损伤是水果分级分类和消费者感知的重要标准。使用中心复合设计 (CCD) 的响应面方法 (RSM) 具有三个独立变量，即频率（7、13.5 和 20 Hz）、振动持续时间（15、30 和 45 分钟）和加速度（2.942、5.884 和 8.826 ms ^-2 ) 被用于“Glom Sali”番石榴的振动测试。在 20°C 下进行 20 次模拟振动处理 48 小时，以评估和分析褐变指数 (BI)、总色差 (TCD)、瘀伤面积 (BA) 的数字图像分析和归一化分形维数差 (ΔFD/FD ₀) 用于番石榴果皮上的振动擦伤损坏。结果表明，加速度是振动擦伤的一个重要因素，尤其是在 8.826 ms ^{-2 时}。对于1.088的固定目标值 ΔFD/FD ₀和总面积的 10% 的 BA，优化的处理条件是频率水平 13.5 Hz、振动持续时间 30 分钟和加速度水平 6.570 ms ^-2。TCD 与 BA (0.7724) 或 ΔFD/FD ₀ ( 0.7484) 之间的相关系数 ( r )显示出比 BI (0.4605) 更高的关系，而 ΔFD/FD ₀值比 BA 具有更高的可靠性和可重复性来预测番石榴中的振动瘀伤。结果表明，通过图像分析评估的分形维数差异是确定番石榴果实振动瘀伤严重程度的潜在方法。