为了研究切纵流联合收获机脱粒分离装置的最佳结构参数和运动参数,对履带式切纵流联合收获田间试验机进行结构改进、载荷测试系统的构建和水稻田间试验,研究切流滚筒、纵轴流滚筒间隙和切流滚筒、纵轴流滚筒转速对脱粒总功耗、切流滚筒...为了研究切纵流联合收获机脱粒分离装置的最佳结构参数和运动参数,对履带式切纵流联合收获田间试验机进行结构改进、载荷测试系统的构建和水稻田间试验,研究切流滚筒、纵轴流滚筒间隙和切流滚筒、纵轴流滚筒转速对脱粒总功耗、切流滚筒功耗、纵轴流滚筒功耗和夹带损失率等性能的影响。并对总功耗和夹带损失率的数据进行二次多项式回归分析和复合型优化分析得到最佳参数配置:切流滚筒间隙为30.99 mm,纵轴流滚筒间隙为14mm,切流滚筒和纵轴流滚筒转速为892.95、848.95 r/min。试验表明,该参数组合下,脱粒总功耗39.03 k W,切流滚筒功耗11.72 k W,纵轴流滚筒功耗27.31 k W,夹带损失率0.50%。对切流滚筒和纵轴流滚筒下方脱出混合物分布进行了研究,为清选装置的设计与优化提供了依据。展开更多
The correlation between the stress concentration and the spontaneous magnetic signals of metal magnetic memory(MMM) was investigated via tensile tests. Sheet specimens of the Q235 steel were machined into standard bar...The correlation between the stress concentration and the spontaneous magnetic signals of metal magnetic memory(MMM) was investigated via tensile tests. Sheet specimens of the Q235 steel were machined into standard bars with rectangular holes to obtain various stress concentration factors. The tangential component Hp(x) of MMM signals and its related magnetic characteristic parameters throughout the loading process were presented and analyzed. It is found that the tangential component Hp(x) is sensitive to the abnormal magnetic changes caused by the local stress concentration in the defect area. The minimum magnetic field is positively correlated to the magnitude of the load and the distance from the notch. The tangential magnetic stress concentration factor presents good numerical stability during the entire loading process, and can be used to evaluate the stress concentration factor. The results obtained will be a complement to the MMM technique.展开更多
文摘为了研究切纵流联合收获机脱粒分离装置的最佳结构参数和运动参数,对履带式切纵流联合收获田间试验机进行结构改进、载荷测试系统的构建和水稻田间试验,研究切流滚筒、纵轴流滚筒间隙和切流滚筒、纵轴流滚筒转速对脱粒总功耗、切流滚筒功耗、纵轴流滚筒功耗和夹带损失率等性能的影响。并对总功耗和夹带损失率的数据进行二次多项式回归分析和复合型优化分析得到最佳参数配置:切流滚筒间隙为30.99 mm,纵轴流滚筒间隙为14mm,切流滚筒和纵轴流滚筒转速为892.95、848.95 r/min。试验表明,该参数组合下,脱粒总功耗39.03 k W,切流滚筒功耗11.72 k W,纵轴流滚筒功耗27.31 k W,夹带损失率0.50%。对切流滚筒和纵轴流滚筒下方脱出混合物分布进行了研究,为清选装置的设计与优化提供了依据。
基金Funded by the Zhejiang Provincial Natural Science Foundation of China(LZ12E08003)the Fundamental Research Funds for the Central Universities,China(2015QNA4028)
文摘The correlation between the stress concentration and the spontaneous magnetic signals of metal magnetic memory(MMM) was investigated via tensile tests. Sheet specimens of the Q235 steel were machined into standard bars with rectangular holes to obtain various stress concentration factors. The tangential component Hp(x) of MMM signals and its related magnetic characteristic parameters throughout the loading process were presented and analyzed. It is found that the tangential component Hp(x) is sensitive to the abnormal magnetic changes caused by the local stress concentration in the defect area. The minimum magnetic field is positively correlated to the magnitude of the load and the distance from the notch. The tangential magnetic stress concentration factor presents good numerical stability during the entire loading process, and can be used to evaluate the stress concentration factor. The results obtained will be a complement to the MMM technique.
