振动冲击复合载荷对库尔勒香梨损伤影响研究

Study on bruise of korla fragrant pear under combined vibration and shock load

振动冲击复合载荷是库尔勒香梨机械损伤中主要损伤形式之一,明确复合载荷对库尔勒香梨损伤的影响是目前亟需解决的问题。以不同成熟度库尔勒香梨为研究对象,阐释单一载荷冲击与振动对香梨损伤的影响规律,构建振动冲击复合载荷与香梨损伤面积关系间的数学模型,揭示振动冲击复合载荷损伤规律。结果表明:香梨损伤面积随着冲击高度与振动时间的增长而增大。在香梨成熟初期与末期,同一载荷不同成熟度香梨损伤面积变化不明显,成熟中期,同一载荷不同成熟度变化明显;构建振动冲击复合载荷与香梨损伤面积关系数学模型复合二次函数,该模型可表征不同成熟度香梨损伤面积与复合载荷间的关系。研究结果为减少香梨机械损伤提供理论依据。

Vibration impact composite load is one of the main mechanical bruise form for korla fragrant pear. It is an urgent problem to determin the impact of composite load on korla fragrant pear bruise. Taking korla fragrant pear with different maturity as the research object, The influence law of single load impact and vibration on fragrant pear bruise were explained, and the mathematical model between vibration impact composite load and fragrant pear busise area were constructed, and the bruise law of vibration impact composite load was revealed in this paper. The results showed that the damage area of fragrant pear increased with the increase of impact height and vibration time. There are no significant change in the damage area of fragrant pear with different maturity under the same load during the ripening stage of early and late. And in the middle ripening stage, the damage area of fragrant pear with different maturity under the same load changed significantly;The mathematical model of the relationship between the vibration impact composite load and the damage area of fragrant pear conformed to the quadratic function, which can characterize the relationship between the damage area of fragrant pear with different maturity and the composite load. The results provide a theoretical basis for reducing the mechanical damage of fragrant pear.