猕猴桃的模拟振动实验及特性研究

目的研究猕猴桃在运输过程中振动特性以及机械损伤的影响因素,为增强水果运输包装的防护性提供可靠的理论依据。方法通过扫频振动实验检测猕猴桃的共振频率;基于正交实验分析法进行猕猴桃的定频振动实验,分析振动加速度、包装缓冲材料、振动时间和堆码层数等因素对表面损伤指数和振动传递率的影响,从而获得造成猕猴桃机械损伤的敏感因子。结果当振动加速度为0.15g时,猕猴桃的共振频率为85.2Hz;采用纸屑作为缓冲材料的整体包装,猕猴桃的受损程度最小,其振动传递率也较小。结论对表面损伤指数和振动传递率影响最大的因子均为缓冲包装结构,纸屑衬垫和EPS衬垫的缓冲性能优于PET衬垫。振动传递率越大,表面损伤指数越大。

Simulated Vibration Experiment and Features of Kiwifruit

This work aims to study the vibration characteristics and mechanical damage factors of Kiwifruit during transportation, and provide a reliable theoretical basis for enhancing the protection of fruit transportation packaging. The resonance frequency of kiwifruit was detected by sweeping frequency vibration experiment; the fixed frequency vibration experiment of kiwifruit was carried out based on orthogonal experimental analysis method; and the effects of vibration acceleration, packaging buffer material, vibration time and stacking layers on surface damage index and vibration trans-mission rate were analyzed, so as to obtain the sensitive factors on mechanical damage of kiwifruit. The experimental results show that when the vibration acceleration was 0.15g, the resonance frequency of kiwifruit was 85.2 Hz; the damage degree of kiwifruit was the smallest when the paper scraps were used as cushioning material, and the vibration transmission rate was also small. It is concluded that cushioning packaging structure is the most important factor affecting the surface damage index and vibration transmission rate. The cushioning performance of paper scrap liner and EPS liner is better than that of PET liner. The bigger the vibration transmission rate is, the bigger the surface damage index is.