On the basis of analyzing the machine-workpiece-tool system, the main factors affecting diameter errors in bars turning are considered, and the mathematic models of the actual workpiece diameter at the cutting point a...On the basis of analyzing the machine-workpiece-tool system, the main factors affecting diameter errors in bars turning are considered, and the mathematic models of the actual workpiece diameter at the cutting point are established according to the three usual methods of mounting workpieces on a turning machine. Further a prediction system for diameter errors is developed; a new method, called discrete nodes output, is presented and applied to expressing workpiece diameter errors at given points along the part axis, then off-line compensation is implemented according to the prediction values to diminish machining errors. The results indicate that the method can diminish diameter errors more than 70%, greatly improve the machining accuracy of bars.展开更多
This paper presents an on-line measurement method for the diameter and roundness error of balls.An easy-installation rotary scanning system,which integrates the principles of the diameter and the roundness measurement...This paper presents an on-line measurement method for the diameter and roundness error of balls.An easy-installation rotary scanning system,which integrates the principles of the diameter and the roundness measurements,is constructed.The rotary scanning system consists of a rotary stage,a linear stage,and two sensors with a什at probe.Two sensors are initially installed on the linear stage and contact each other.The outputs of two sensors are reset to zero at first.The ball is then mounted on the rotary stage and positioned between two flat probes.The variations of the diameter and the roundness error of the ball at each angular position can be directly recorded by two sensors when the ball is rotated by the rotary stage.Substituting the outputs of two sensors into the proposed mathematical models,the diameter and roundness error can be evaluated.The effects of the alignment error induced by the spindle error of the rotary stage and the titling error and the eccentric error of the ball on the measurement accuracy can be self-separated in the proposed on-line measurement method.A series of experiments are carried out to verify the effectiveness and the capability of the proposed on-line measurement method and the designed rotary scanning system.The designed system is easy to construct both in the laboratory environment and the factory field.展开更多
在林业研究中,胸径-树高二元联合分布多由相同边缘分布构造,而林分的胸径与树高的实际分布状况可能有所差异。为降低这种差异带来的影响,依据佳木斯市孟家岗林场的115块长白落叶松人工林数据,选择适用条件低、适应范围广的Copula函数方...在林业研究中,胸径-树高二元联合分布多由相同边缘分布构造,而林分的胸径与树高的实际分布状况可能有所差异。为降低这种差异带来的影响,依据佳木斯市孟家岗林场的115块长白落叶松人工林数据,选择适用条件低、适应范围广的Copula函数方法拟合落叶松胸径-树高二元联合分布模型。首先选择威布尔(Weibull)、广义威布尔(G-Weibull)、逻辑斯蒂(Logistic)、轻量逻辑斯蒂(Logit-Logistic)、伽马(Gamma)、对数正态(Log-Normal)6个分布函数作为备选基础模型,根据K-S(kolmogorov smirnov test)检验与半参数估计结果筛选并构建Copula胸径-树高二元联合分布模型,再通过负对数似然(negative log-likelihood,NLL)、Sn拟合优度统计量和似然比检验(likelihood ratio test,LRT)与二元对数logistic分布函数和二元Weibull分布函数进行比较,最后使用雷诺误差指数(error index of Reynolds,EI)对模型预测能力进行评估。结果表明,基于Copula函数的二元分拟合结果与模型(EI=0.3184)预估能力皆优于二元Weibull分布(EI=0.6381)和二元对数Logistic分布(EI=0.9490),说明此方法构建胸径-树高二元联合Copula分布模型能够很好地描述落叶松人工林胸径树高联合分布,以Copula方法构建树高-胸径联合分布是可行的。展开更多
针对三点起爆控制参数(起爆直径、起爆同步误差)对尾翼爆炸成型弹丸(explosively formed projectile,EFP)成型的影响问题,理论分析了三点起爆条件下爆轰波的马赫碰撞,计算获得了不同起爆直径下马赫波的相关参数,利用LS-DYNA有限元软件...针对三点起爆控制参数(起爆直径、起爆同步误差)对尾翼爆炸成型弹丸(explosively formed projectile,EFP)成型的影响问题,理论分析了三点起爆条件下爆轰波的马赫碰撞,计算获得了不同起爆直径下马赫波的相关参数,利用LS-DYNA有限元软件通过数值模拟研究了不同起爆直径下三点起爆同步误差对EFP尾翼成型及飞行速度的影响规律。结果表明,起爆直径越大,马赫波在药型罩上的作用面积越小,马赫超压越大,形成的EFP长径比和速度越大;起爆直径为30、40、50 mm三点起爆成型装药形成较佳尾翼EFP应满足的最大起爆同步误差分别为50、100、150ns;此外,尽量使中间起爆点起爆同步误差约为最大同步误差的一半,有利于降低尾翼EFP的侧向分速度,提高飞行稳定性。展开更多
文摘On the basis of analyzing the machine-workpiece-tool system, the main factors affecting diameter errors in bars turning are considered, and the mathematic models of the actual workpiece diameter at the cutting point are established according to the three usual methods of mounting workpieces on a turning machine. Further a prediction system for diameter errors is developed; a new method, called discrete nodes output, is presented and applied to expressing workpiece diameter errors at given points along the part axis, then off-line compensation is implemented according to the prediction values to diminish machining errors. The results indicate that the method can diminish diameter errors more than 70%, greatly improve the machining accuracy of bars.
文摘基于激光测距的非接触式车轮踏面外径测量原理,提出了4根激光线汇交于一点的对中方法.采用标定指针、标定板和标定环对4个激光测量传感器的位姿进行标定,其中,位姿参数主要有水平面内激光线之间的夹角θ和激光器发射点到汇交点的距离.在此基础上,对激光线垂直面内的倾斜角β和水平面内的夹角θ进行了误差分析.该测量方法能够测量Φ800~1 300 mm的车轮,测量误差小于±0.5 mm.
基金the National Natural Science Foundation of China(51905078)National Key Research and Development Program of China(2018YFB2001400,2017YFF0204800)Fundamental Research Funds for the Central Universities(DUT19RC(4)007).
文摘This paper presents an on-line measurement method for the diameter and roundness error of balls.An easy-installation rotary scanning system,which integrates the principles of the diameter and the roundness measurements,is constructed.The rotary scanning system consists of a rotary stage,a linear stage,and two sensors with a什at probe.Two sensors are initially installed on the linear stage and contact each other.The outputs of two sensors are reset to zero at first.The ball is then mounted on the rotary stage and positioned between two flat probes.The variations of the diameter and the roundness error of the ball at each angular position can be directly recorded by two sensors when the ball is rotated by the rotary stage.Substituting the outputs of two sensors into the proposed mathematical models,the diameter and roundness error can be evaluated.The effects of the alignment error induced by the spindle error of the rotary stage and the titling error and the eccentric error of the ball on the measurement accuracy can be self-separated in the proposed on-line measurement method.A series of experiments are carried out to verify the effectiveness and the capability of the proposed on-line measurement method and the designed rotary scanning system.The designed system is easy to construct both in the laboratory environment and the factory field.
文摘在林业研究中,胸径-树高二元联合分布多由相同边缘分布构造,而林分的胸径与树高的实际分布状况可能有所差异。为降低这种差异带来的影响,依据佳木斯市孟家岗林场的115块长白落叶松人工林数据,选择适用条件低、适应范围广的Copula函数方法拟合落叶松胸径-树高二元联合分布模型。首先选择威布尔(Weibull)、广义威布尔(G-Weibull)、逻辑斯蒂(Logistic)、轻量逻辑斯蒂(Logit-Logistic)、伽马(Gamma)、对数正态(Log-Normal)6个分布函数作为备选基础模型,根据K-S(kolmogorov smirnov test)检验与半参数估计结果筛选并构建Copula胸径-树高二元联合分布模型,再通过负对数似然(negative log-likelihood,NLL)、Sn拟合优度统计量和似然比检验(likelihood ratio test,LRT)与二元对数logistic分布函数和二元Weibull分布函数进行比较,最后使用雷诺误差指数(error index of Reynolds,EI)对模型预测能力进行评估。结果表明,基于Copula函数的二元分拟合结果与模型(EI=0.3184)预估能力皆优于二元Weibull分布(EI=0.6381)和二元对数Logistic分布(EI=0.9490),说明此方法构建胸径-树高二元联合Copula分布模型能够很好地描述落叶松人工林胸径树高联合分布,以Copula方法构建树高-胸径联合分布是可行的。
文摘针对三点起爆控制参数(起爆直径、起爆同步误差)对尾翼爆炸成型弹丸(explosively formed projectile,EFP)成型的影响问题,理论分析了三点起爆条件下爆轰波的马赫碰撞,计算获得了不同起爆直径下马赫波的相关参数,利用LS-DYNA有限元软件通过数值模拟研究了不同起爆直径下三点起爆同步误差对EFP尾翼成型及飞行速度的影响规律。结果表明,起爆直径越大,马赫波在药型罩上的作用面积越小,马赫超压越大,形成的EFP长径比和速度越大;起爆直径为30、40、50 mm三点起爆成型装药形成较佳尾翼EFP应满足的最大起爆同步误差分别为50、100、150ns;此外,尽量使中间起爆点起爆同步误差约为最大同步误差的一半,有利于降低尾翼EFP的侧向分速度,提高飞行稳定性。
