本文旨在优化三轴数控机床误差辨识过程,提出了基于特征工件切削的动静态误差高效辨识与分离方法。本文设计了可反映几何误差的阶梯型特征工件,特征工件切削完成后,分别对其进行在机测量和三坐标测量机标定,基于两组测试数据实现7项几...本文旨在优化三轴数控机床误差辨识过程,提出了基于特征工件切削的动静态误差高效辨识与分离方法。本文设计了可反映几何误差的阶梯型特征工件,特征工件切削完成后,分别对其进行在机测量和三坐标测量机标定,基于两组测试数据实现7项几何误差与动态误差的辨识与分离,其辨识结果与激光干涉仪测量结果高度吻合,证实了本方法的可行性、高效性和准确性。This paper aims to optimize the error identification process of three-axis CNC machine tools, and proposes an efficient identification and separation method for dynamic and static errors based on feature workpiece cutting. In this paper, a stepped feature workpiece that can reflect geometric er-rors is designed, and the mapping relationship between geometric error terms and features is es-tablished. After the feature workpiece is cut, it performs on-machine measurement and offline three-coordinate measurement respectively, and realizes the identification and separation of 7 geometric errors and dynamic errors based on two sets of test data. The geometric error identifica-tion result is highly consistent with the laser interferometer measurement result, which proves the feasibility, high efficiency and accuracy.展开更多
Based on FLUENT software, studied the blast fume diffusion characteristics of a driving face under 8 situations, and analyzed the influence to fume diffusion of different drift length and different ventilation pipe ou...Based on FLUENT software, studied the blast fume diffusion characteristics of a driving face under 8 situations, and analyzed the influence to fume diffusion of different drift length and different ventilation pipe outlet positions. Through regression analysis, functions of ventilation time to the drift length and ventilation pipe outlet position was obtained.展开更多
In China, seasonal frozen soil is widely distributed. The freezing damage of subgrade soil in Jilin Province has been one of major engineering geological problems troubling the safety of road, in which some common dam...In China, seasonal frozen soil is widely distributed. The freezing damage of subgrade soil in Jilin Province has been one of major engineering geological problems troubling the safety of road, in which some common damage phenomena, such as frost heave, subsidence deformation and frost boiling, are all caused by water translocation. Aiming at the phenomenon, the changes of moisture content of seasonal frozen soil in Changchun City are mainly studied by long-term field observation and indoor testing of physical properties under different conditions, and then the variation characteristics of moisture content in soil under different compactness and temperature conditions are realized. The results show that the increasing section of moisture content and negative temperature section all lie in O. 0 - 1.0 m of subgrade. Both lowest air and earth temperature occur in January to February, and the most negative temperature ranges from -7℃ to -10℃.展开更多
Complementing our previous publications, this paper presents the information schema constructs （ISCs） that underpin the programming of specific system manifestation feature （SMF） orientated information management ...Complementing our previous publications, this paper presents the information schema constructs （ISCs） that underpin the programming of specific system manifestation feature （SMF） orientated information management and composing system models. First, we briefly present （1） the general process of pre-embodiment design with SMFs, （2） the procedures of creating genotypes and phenotypes of SMFs, （3） the specific procedure of instantiation of phenotypes of SMFs, and （4） the procedure of system model management and processing. Then, the chunks of information needed for instantiation of phenotypes of SMFs are discussed, and the ISCs designed for instantiation presented. Afterwards, the information management aspects of system modeling are addressed. Methodologically, system modeling involves （1） placement of phenotypes of SMF in the modeling space, （2） combining them towards the desired architecture and operation, （3） assigning values to the parameters and checking the satisfac- tion of constraints, and （4） storing the system model in the SMFs-based warehouse database. The final objective of the reported research is to develop an SMFs-based toolbox to support modeling of cyber-physical systems （CPSs）.展开更多
文摘本文旨在优化三轴数控机床误差辨识过程,提出了基于特征工件切削的动静态误差高效辨识与分离方法。本文设计了可反映几何误差的阶梯型特征工件,特征工件切削完成后,分别对其进行在机测量和三坐标测量机标定,基于两组测试数据实现7项几何误差与动态误差的辨识与分离,其辨识结果与激光干涉仪测量结果高度吻合,证实了本方法的可行性、高效性和准确性。This paper aims to optimize the error identification process of three-axis CNC machine tools, and proposes an efficient identification and separation method for dynamic and static errors based on feature workpiece cutting. In this paper, a stepped feature workpiece that can reflect geometric er-rors is designed, and the mapping relationship between geometric error terms and features is es-tablished. After the feature workpiece is cut, it performs on-machine measurement and offline three-coordinate measurement respectively, and realizes the identification and separation of 7 geometric errors and dynamic errors based on two sets of test data. The geometric error identifica-tion result is highly consistent with the laser interferometer measurement result, which proves the feasibility, high efficiency and accuracy.
文摘Based on FLUENT software, studied the blast fume diffusion characteristics of a driving face under 8 situations, and analyzed the influence to fume diffusion of different drift length and different ventilation pipe outlet positions. Through regression analysis, functions of ventilation time to the drift length and ventilation pipe outlet position was obtained.
基金Supported by National Natural Science Foundation of China (No.40672180)
文摘In China, seasonal frozen soil is widely distributed. The freezing damage of subgrade soil in Jilin Province has been one of major engineering geological problems troubling the safety of road, in which some common damage phenomena, such as frost heave, subsidence deformation and frost boiling, are all caused by water translocation. Aiming at the phenomenon, the changes of moisture content of seasonal frozen soil in Changchun City are mainly studied by long-term field observation and indoor testing of physical properties under different conditions, and then the variation characteristics of moisture content in soil under different compactness and temperature conditions are realized. The results show that the increasing section of moisture content and negative temperature section all lie in O. 0 - 1.0 m of subgrade. Both lowest air and earth temperature occur in January to February, and the most negative temperature ranges from -7℃ to -10℃.
文摘Complementing our previous publications, this paper presents the information schema constructs （ISCs） that underpin the programming of specific system manifestation feature （SMF） orientated information management and composing system models. First, we briefly present （1） the general process of pre-embodiment design with SMFs, （2） the procedures of creating genotypes and phenotypes of SMFs, （3） the specific procedure of instantiation of phenotypes of SMFs, and （4） the procedure of system model management and processing. Then, the chunks of information needed for instantiation of phenotypes of SMFs are discussed, and the ISCs designed for instantiation presented. Afterwards, the information management aspects of system modeling are addressed. Methodologically, system modeling involves （1） placement of phenotypes of SMF in the modeling space, （2） combining them towards the desired architecture and operation, （3） assigning values to the parameters and checking the satisfac- tion of constraints, and （4） storing the system model in the SMFs-based warehouse database. The final objective of the reported research is to develop an SMFs-based toolbox to support modeling of cyber-physical systems （CPSs）.
