以传统式张力腿平台(Tension Leg Platform)为对象,采用数值模拟与水池实验相结合的方法研究TLP涡激运动问题,以及张力腿和立管涡激振动特性;采用计算流体力学的方法,建立TLP涡激运动数值分析模型,分析均匀流作用下不同流速、来流方向...以传统式张力腿平台(Tension Leg Platform)为对象,采用数值模拟与水池实验相结合的方法研究TLP涡激运动问题,以及张力腿和立管涡激振动特性;采用计算流体力学的方法,建立TLP涡激运动数值分析模型,分析均匀流作用下不同流速、来流方向、以及规则波波流联合下TLP涡激运动规律,对张力腿、立管的涡激振动特性进行分析;将数值模拟计算结果与拖曳水池、全水深系泊水池试验结果对比,验证数值模拟与水池试验的一致性。分析结果表明,当流的折合速度在5.5~8.5之间时,TLP涡激运动出现锁频现象,系泊有减小平台横向涡激运动的作用,规则波对于流致涡激运动横荡方向运动有减小作用,而对纵荡的影响是其响应随规则波波高的增加而增加。本文得到的结论可为TLP的运动性能研究和工程设计提供参考。展开更多
对张力腿平台(tension leg platform,TLP)在不同系泊失效条件下的动态响应进行分析,采用全耦合数值工具ANSYS/AQWA建立非线性平台-筋腱模型,并提出一种模拟筋腱失效的方法。主要分析了筋腱失效时的瞬态响应,筋腱同时失效和渐进失效下的...对张力腿平台(tension leg platform,TLP)在不同系泊失效条件下的动态响应进行分析,采用全耦合数值工具ANSYS/AQWA建立非线性平台-筋腱模型,并提出一种模拟筋腱失效的方法。主要分析了筋腱失效时的瞬态响应,筋腱同时失效和渐进失效下的平台瞬态响应,以及筋腱失效后平台的性能变化。结果表明:首先,筋腱断裂失效会导致平台产生瞬时过冲;其次,筋腱同时失效下的瞬态响应比筋腱渐进失效的瞬态响应更显著;最后,筋腱失效后平台的性能会发生明显的变化。因此,需提前研究筋腱断裂对平台动态响应的影响,防止平台的安全性受到威胁。展开更多
Walnut anthracnose induced by Colletotrichum gloeosporioides is a disastrous disease that severely restricts the development of the walnut industry in China.Long non-coding RNAs(lncRNAs)are involved in adaptive respon...Walnut anthracnose induced by Colletotrichum gloeosporioides is a disastrous disease that severely restricts the development of the walnut industry in China.Long non-coding RNAs(lncRNAs)are involved in adaptive responses to disease,but their roles in the regulation of walnut anthracnose resistance response are not well defined.In this study,transcriptome analysis demonstrated that a C.gloeosporioides-induced lncRNA,lncRNA109897,located upstream from the target gene JrCCR4,upregulated the expression of JrCCR4.JrCCR4 interacted with JrTLP1b and promoted its transcriptional activity.In turn,JrTLP1b induced the transcription of lncRNA109897 to promote its expression.Meanwhile,transient expression in walnut leaves and stable transformation of Arabidopsis thaliana further proved that lncRNA,JrCCR4,and JrTLP1b improve the resistance of C.gloeosporioides.Collectively,these findings provide insights into the mechanism by which the lncRNA109897-JrCCR4-JrTLP1b transcriptional cascade regulates the resistance of walnut to anthracnose.展开更多
在氩气保护下,用FeN iS iB非晶箔T91钢管进行了瞬时液相扩散连接.通过正交实验,研究了工艺参数对接头组织和性能的影响,分析了TLP连接接头的显微组织、力学性能和元素分布,确定出了合适的连接工艺参数.结果表明,在合适的工艺参数下,接...在氩气保护下,用FeN iS iB非晶箔T91钢管进行了瞬时液相扩散连接.通过正交实验,研究了工艺参数对接头组织和性能的影响,分析了TLP连接接头的显微组织、力学性能和元素分布,确定出了合适的连接工艺参数.结果表明,在合适的工艺参数下,接头可以获得良好的组织和性能.T91钢TLP连接工艺为温度1250℃,等温凝固时间3 m in,压力6 MPa.展开更多
文摘以传统式张力腿平台(Tension Leg Platform)为对象,采用数值模拟与水池实验相结合的方法研究TLP涡激运动问题,以及张力腿和立管涡激振动特性;采用计算流体力学的方法,建立TLP涡激运动数值分析模型,分析均匀流作用下不同流速、来流方向、以及规则波波流联合下TLP涡激运动规律,对张力腿、立管的涡激振动特性进行分析;将数值模拟计算结果与拖曳水池、全水深系泊水池试验结果对比,验证数值模拟与水池试验的一致性。分析结果表明,当流的折合速度在5.5~8.5之间时,TLP涡激运动出现锁频现象,系泊有减小平台横向涡激运动的作用,规则波对于流致涡激运动横荡方向运动有减小作用,而对纵荡的影响是其响应随规则波波高的增加而增加。本文得到的结论可为TLP的运动性能研究和工程设计提供参考。
文摘对张力腿平台(tension leg platform,TLP)在不同系泊失效条件下的动态响应进行分析,采用全耦合数值工具ANSYS/AQWA建立非线性平台-筋腱模型,并提出一种模拟筋腱失效的方法。主要分析了筋腱失效时的瞬态响应,筋腱同时失效和渐进失效下的平台瞬态响应,以及筋腱失效后平台的性能变化。结果表明:首先,筋腱断裂失效会导致平台产生瞬时过冲;其次,筋腱同时失效下的瞬态响应比筋腱渐进失效的瞬态响应更显著;最后,筋腱失效后平台的性能会发生明显的变化。因此,需提前研究筋腱断裂对平台动态响应的影响,防止平台的安全性受到威胁。
基金This work is supported by the National Natural Science Foundation of China(32001340)the Improved Variety Program of Shandong Province of China(2020LZGC090102)the Natural Science Foundation of Shandong Province(ZR2020QC169)。
文摘Walnut anthracnose induced by Colletotrichum gloeosporioides is a disastrous disease that severely restricts the development of the walnut industry in China.Long non-coding RNAs(lncRNAs)are involved in adaptive responses to disease,but their roles in the regulation of walnut anthracnose resistance response are not well defined.In this study,transcriptome analysis demonstrated that a C.gloeosporioides-induced lncRNA,lncRNA109897,located upstream from the target gene JrCCR4,upregulated the expression of JrCCR4.JrCCR4 interacted with JrTLP1b and promoted its transcriptional activity.In turn,JrTLP1b induced the transcription of lncRNA109897 to promote its expression.Meanwhile,transient expression in walnut leaves and stable transformation of Arabidopsis thaliana further proved that lncRNA,JrCCR4,and JrTLP1b improve the resistance of C.gloeosporioides.Collectively,these findings provide insights into the mechanism by which the lncRNA109897-JrCCR4-JrTLP1b transcriptional cascade regulates the resistance of walnut to anthracnose.
文摘在氩气保护下,用FeN iS iB非晶箔T91钢管进行了瞬时液相扩散连接.通过正交实验,研究了工艺参数对接头组织和性能的影响,分析了TLP连接接头的显微组织、力学性能和元素分布,确定出了合适的连接工艺参数.结果表明,在合适的工艺参数下,接头可以获得良好的组织和性能.T91钢TLP连接工艺为温度1250℃,等温凝固时间3 m in,压力6 MPa.
