本文以NX 8.5软件为平台,基于NX Open API接口,使用Visual Studio 2010和UIStyler工具,开发一套系列化产品工装自动设计系统。首先,针对系列化产品的不同零件分别设计典型工装,并将零件的外形尺寸及避让尺寸作为模型驱动参数。之后,通过...本文以NX 8.5软件为平台,基于NX Open API接口,使用Visual Studio 2010和UIStyler工具,开发一套系列化产品工装自动设计系统。首先,针对系列化产品的不同零件分别设计典型工装,并将零件的外形尺寸及避让尺寸作为模型驱动参数。之后,通过UIStyler工具设计调用工装及填写参数的对话框,并生成C++语言模板。最后,使用Visual Studio 2010编写读取及改写典型工装模型参数的程序,通过改写参数驱动典型工装模型生成新零件的工装模型。由于工装通常为装配体,因此需要将驱动参数设置在在装配模型中,采用自顶向下的工装设计方法,利用NX中的WAVE功能实现各个工装零件的驱动。应用表明,使用该系统能大幅提升工装设计效率,减少因人员差异导致的工装设计差异较大的问题。同时,对于产品零件尺寸变化不敏感的工装零件,可以采用固定设计,以减少工装专用件的设计和制造流程,实现部分工装零件的通用化。展开更多
基于43套CMIP6模式资料和Ocean Reanalysis System 5(ORAS5)同化数据,本文探讨了北冰洋加拿大海盆波弗特流涡在历史时期(1979—2014年)和未来SSP1-2.6和SSP5-8.5两种温室气体排放情景下的变化特征。研究结果表明,历史时期CMIP6的多个模...基于43套CMIP6模式资料和Ocean Reanalysis System 5(ORAS5)同化数据,本文探讨了北冰洋加拿大海盆波弗特流涡在历史时期(1979—2014年)和未来SSP1-2.6和SSP5-8.5两种温室气体排放情景下的变化特征。研究结果表明,历史时期CMIP6的多个模式及多模式平均都低估了流涡的强度,且对流涡强度变化趋势的模拟存在较大差异;其中35套CMIP6模式资料中有45%的模式资料能够较好地再现ORAS5同化数据所显示的上升趋势。在未来SSP1-2.6和SSP5-8.5两种排放情景下,波弗特流涡强度都将呈上升趋势,但在21世纪后期,后者的强度会低于前者且这种差异将随时间增大;海冰密集度和海平面气压呈显著正相关、均持续下降,但后者的下降趋势较前者更明显。对流涡增强的成因分析表明,SSP1-2.6排放情景下,流涡的增强主要与海冰密集度的下降有关,而SSP5-8.5排放情景下,流涡的弱增强则主要与海冰显著减少导致的波弗特高压减弱有关。展开更多
Due to the control of ozone(O_(3))-depleting substances(ODSs),it is believed that stratospheric O_(3)will recover in the future.However,in the context of global change,the contributions of other factors to O_(3)recove...Due to the control of ozone(O_(3))-depleting substances(ODSs),it is believed that stratospheric O_(3)will recover in the future.However,in the context of global change,the contributions of other factors to O_(3)recovery are also worth discussing.This paper investigates the independent and joint influences of changes in global methane(CH_(4)),carbon dioxide(CO_(2))and sea surface temperature(SST)on stratospheric O_(3)under the Representative Concentration Pathway(RCP)8.5 scenario in 2050 using sensitivity experiments with the Whole Atmosphere Community Climate Model,version4.Results show that,in the polar lower stratosphere,CH_(4)can reduce ODSs via chemical processes and further increase stratospheric O_(3)and temperature,which tends to reduce polar stratospheric clouds.This acts as positive feedback to O_(3)recovery.The increase of CH_(4)in the sensitivity experiments(CH_(4)is adjusted to match the 2050 levels under the RCP8.5scenario)could lead to a polar O_(3)recovery of about 27.9 DU in the Arctic.Increased CO_(2)(CO_(2) is adjusted to match the 2050 levels under the RCP8.5 scenario)can indirectly lead to a 6.5 DU increase in global total column O_(3)(TCO)through radiative effects,while the influence of SST on TCO in tropical regions can reach-3.3%.For the joint impact of CH_(4),CO_(2)and SST changes,CH_(4)can account for up to 69.0%of the TCO variations in the Antarctic region.Finally,we compare the effects of CH_(4)and ODSs on O_(3)in the polar regions in future experiments based on the RCP8.5 scenario.We find that ODSs are a dominant factor in O_(3)depletion in both poles;however,after 2040,the influence of increased CH_(4)on O_(3)recovery in the Arctic will surpass the effect of decreased ODSs.It implies that the future increase in CH_(4)may have an important impact on O_(3).展开更多
文摘本文以NX 8.5软件为平台,基于NX Open API接口,使用Visual Studio 2010和UIStyler工具,开发一套系列化产品工装自动设计系统。首先,针对系列化产品的不同零件分别设计典型工装,并将零件的外形尺寸及避让尺寸作为模型驱动参数。之后,通过UIStyler工具设计调用工装及填写参数的对话框,并生成C++语言模板。最后,使用Visual Studio 2010编写读取及改写典型工装模型参数的程序,通过改写参数驱动典型工装模型生成新零件的工装模型。由于工装通常为装配体,因此需要将驱动参数设置在在装配模型中,采用自顶向下的工装设计方法,利用NX中的WAVE功能实现各个工装零件的驱动。应用表明,使用该系统能大幅提升工装设计效率,减少因人员差异导致的工装设计差异较大的问题。同时,对于产品零件尺寸变化不敏感的工装零件,可以采用固定设计,以减少工装专用件的设计和制造流程,实现部分工装零件的通用化。
文摘基于43套CMIP6模式资料和Ocean Reanalysis System 5(ORAS5)同化数据,本文探讨了北冰洋加拿大海盆波弗特流涡在历史时期(1979—2014年)和未来SSP1-2.6和SSP5-8.5两种温室气体排放情景下的变化特征。研究结果表明,历史时期CMIP6的多个模式及多模式平均都低估了流涡的强度,且对流涡强度变化趋势的模拟存在较大差异;其中35套CMIP6模式资料中有45%的模式资料能够较好地再现ORAS5同化数据所显示的上升趋势。在未来SSP1-2.6和SSP5-8.5两种排放情景下,波弗特流涡强度都将呈上升趋势,但在21世纪后期,后者的强度会低于前者且这种差异将随时间增大;海冰密集度和海平面气压呈显著正相关、均持续下降,但后者的下降趋势较前者更明显。对流涡增强的成因分析表明,SSP1-2.6排放情景下,流涡的增强主要与海冰密集度的下降有关,而SSP5-8.5排放情景下,流涡的弱增强则主要与海冰显著减少导致的波弗特高压减弱有关。
基金financial support of the National Natural Science Foundation of China(Grant Nos.42122037,42375070 and 42275084)。
文摘Due to the control of ozone(O_(3))-depleting substances(ODSs),it is believed that stratospheric O_(3)will recover in the future.However,in the context of global change,the contributions of other factors to O_(3)recovery are also worth discussing.This paper investigates the independent and joint influences of changes in global methane(CH_(4)),carbon dioxide(CO_(2))and sea surface temperature(SST)on stratospheric O_(3)under the Representative Concentration Pathway(RCP)8.5 scenario in 2050 using sensitivity experiments with the Whole Atmosphere Community Climate Model,version4.Results show that,in the polar lower stratosphere,CH_(4)can reduce ODSs via chemical processes and further increase stratospheric O_(3)and temperature,which tends to reduce polar stratospheric clouds.This acts as positive feedback to O_(3)recovery.The increase of CH_(4)in the sensitivity experiments(CH_(4)is adjusted to match the 2050 levels under the RCP8.5scenario)could lead to a polar O_(3)recovery of about 27.9 DU in the Arctic.Increased CO_(2)(CO_(2) is adjusted to match the 2050 levels under the RCP8.5 scenario)can indirectly lead to a 6.5 DU increase in global total column O_(3)(TCO)through radiative effects,while the influence of SST on TCO in tropical regions can reach-3.3%.For the joint impact of CH_(4),CO_(2)and SST changes,CH_(4)can account for up to 69.0%of the TCO variations in the Antarctic region.Finally,we compare the effects of CH_(4)and ODSs on O_(3)in the polar regions in future experiments based on the RCP8.5 scenario.We find that ODSs are a dominant factor in O_(3)depletion in both poles;however,after 2040,the influence of increased CH_(4)on O_(3)recovery in the Arctic will surpass the effect of decreased ODSs.It implies that the future increase in CH_(4)may have an important impact on O_(3).
