中文摘要：

影响金属的一棵桃树的影响力量反应扁平表面被看作坚定的非破坏性的决心。目的是在影响力量参数上分析坚定，落下高度，水果团，和影响取向的效果，并且建立在影响力量参数和坚定之间的一种关系。影响力量参数(归还，吸收的精力的百分比，和力量时间的系数的系数) 上的水果坚定，落下高度和水果质量的效果被评估。学习发现归还，吸收的精力的百分比，和力量时间影响系数的系数被水果成熟显著地影响，然而并非由落下高度，影响位置(水果脸颊) ，和质量影响了。吸收精力的百分比与成熟增加了，当归还的力量时间影响系数和系数与成熟减少了时。关系用一个多项式模型在三个影响特征参数(力量时间影响系数，归还的系数，和吸收的精力的百分比) 和桃树坚定之间被获得(R ²=0.932), S 模型(R ²=0.910), 和指数的模型(R ²=0.941), 分别地。

英文摘要：

The impact force response of a peach impacting on a metal flat-surface was considered as nondestructive determination of firmness. The objectives were to analyze the effect of firmness, drop height, fruit mass, and impact orientation on the impact force parameters, and to establish a relationship between the impact force parameter and firmness. The effect of fruit firmness, drop height and fruit mass on the impact force parameters （coefficient of restitution, percentage of energy absorbed, and coefficient of force-time） was evaluated. The study found that the coefficient of restitution, percentage of energy absorbed, and force-time impact coefficient were significantly affected by fruit ripeness, but not affected by drop height, impact position （fruit cheek）, and mass. The percentage of absorbed energy increased with ripeness, while the force-time impact coefficient and coefficient of restitution decreased with ripeness. Relationships were obtained between the three impact characteristic parameters （force-time impact coefficient, coefficient of restitution, and percentage of energy absorbed） and peach firmness using a polynomial model （R2=0.932）, S model （R2=0.910）, and exponential model （R2=0.941）, respectively.