振动激励下枣树力传递效果室内模拟试验

为了提高林果振动采收的作业效率,根据果品在振动过程中瞬时加速度的变化,研究其振动采收时力的传递效果,降低激振功耗。该文以红枣振动采收为研究对象,建立红枣＂枝-柄-果＂的双摆振动模型,分析系统振动过程中的固有频率,获得系统的固有振动频率为14.69、17.26 Hz;利用振动试验测试系统,进行扫频试验,测得枣树发生共振频率的范围集中出现在12-24 Hz;当振幅分别为3、5、7 mm时,频率在12-24 Hz时进行枣树的定频振动试验,通过DHDAS分析软件分析,获得枣树的振动频率和瞬时加速度的关系;对受迫振动的红枣采用3D高速摄像技术进行运动分析,获得红枣在空间的最大瞬时加速度值,通过统计计算分...

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Bibliographic Details
Published in农业工程学报 Vol. 33; no. 17; pp. 65 - 72
Main Author 付威 张志元 刘玉冬 潘俊兵 崔健 丁凯 张慧明
Format Journal Article
LanguageChinese
Published 石河子大学机械电气工程学院,石河子,832003 2017
Subjects
力学性能
振动
激振频率
红枣
试验
力学性能
振动
试验
激振频率
vibration frequency
experiments
vibration
jujube
红枣
mechanical properties
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ISSN1002-6819
DOI10.11975/j.issn.1002-6819.2017.17.009

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Summary:为了提高林果振动采收的作业效率,根据果品在振动过程中瞬时加速度的变化,研究其振动采收时力的传递效果,降低激振功耗。该文以红枣振动采收为研究对象,建立红枣＂枝-柄-果＂的双摆振动模型,分析系统振动过程中的固有频率,获得系统的固有振动频率为14.69、17.26 Hz;利用振动试验测试系统,进行扫频试验,测得枣树发生共振频率的范围集中出现在12-24 Hz;当振幅分别为3、5、7 mm时,频率在12-24 Hz时进行枣树的定频振动试验,通过DHDAS分析软件分析,获得枣树的振动频率和瞬时加速度的关系;对受迫振动的红枣采用3D高速摄像技术进行运动分析,获得红枣在空间的最大瞬时加速度值,通过统计计算分析,红枣的最大瞬时惯性力值均大于果柄最大拉断力6 N。试验表明在振幅为7 mm、频率为17 Hz时,红枣振动采收过程中,力的传递效果较好。该研究可为红枣收获机激振系统的设计提供理论依据和技术参考。
Bibliography:vibration; mechanical properties; experiments; jujube; vibration frequency
11-2047/S
In recent years, jujube planting area in Xinjiang has been increasing, and jujube harvest depends entirely on manual work that is characterized by low efficiency and high cost, which has become the bottleneck of the sustainable development of Xinjiang jujube industry. Therefore, mechanized operation is in urgent need. In order to improve the efficiency of vibration harvesting for fruits to reduce power consumption in excitation, the effect of force transfer in vibration harvesting was studied based on the changes in instantaneous acceleration of fruits in vibration,. Aimed to vibration harvesting of jujube, the preset study analyzed natural frequencies in system vibration through simplifying ＂branch-stalk-fruit＂ of jujube to a double-pendulum vibration model firstly, and then constructed Lagrange＇s double-pendulum multi-degree-of-freedom vibration equation, and the natural vibration frequencies of the system were obtained（14.69
ISSN:1002-6819
DOI:10.11975/j.issn.1002-6819.2017.17.009