基于疲劳损伤理论的果品振动损伤模型表征  

Model for vibration-cumulative bruising of fruit based on fatigue damage theory

作　　者：卢立新[1,2] 周德志[1] 

机构地区：[1]江南大学包装工程系,无锡214122 [2]中国包装总公司食品包装技术与安全重点实验室,无锡214122

出　　处：《农业工程学报》2009年第11期341-344,共4页Transactions of the Chinese Society of Agricultural Engineering

基　　金："十一五"国家科技支撑计划重点课题(2006BAD30B02);教育部科学技术研究重点项目(108066)

摘　　要：疲劳振动是导致果品运输机械损伤的主要原因之一。基于Palmgren-Miner理论,结合果品振动损伤特征与外界振动激励的相关性,提出果品振动疲劳累积损伤模型与模型参数确定方法。以梨果实为研究对象,进行多种工况下的疲劳损伤振动与临界疲劳损伤振动试验,获得了水晶梨的振动疲劳常数;同时依据梨果实分级标准中的优等品损伤面积临界值,得出梨果实损伤激励加速度阈值,试验结果与理论分析吻合性高。研究结果为进一步认识果品振动疲劳损伤机理、进行果品振动缓冲包装提供了技术基础。Fatigue vibration is one of the key factors causing fruit bruising during transportation. A model for vibration-cumulative bruising of fruit was developed based on the Palmgren-Miner fatigue damage theory, and the relativity between the bruise properties and vibration excitation were investigated. The fatigue bruising vibration and critical bruising vibration experiments were conducted for crystal pears under sine excitations of varied acceleration and numbers. The parameters of the model for vibration-cumulative bruising of pear fruit were obtained. According to the produce classification standard of China for pear, the critical bruising volume of high-class pear fruit was calculated, and corresponding vibration excitation threshold was presented. The model predictions agreed well with the experimental data. The research results provide technical bases for recognizing the mechanism of vibration-cumulative bruising of fruit and packaging the fruit for relaxing the vibration.

关 键 词：果品 疲劳损伤 振动 模型 梨 

分 类 号：TB485.3[一般工业技术—包装工程] O377[理学—流体力学]