Hammer

摘要： On February 5,the 1st day of Beijing Winter Olympics,Lillehammer,the host of 1994 Winter Olympics,entered into China Day event of Happy Chinese New Year:Watching Winter Olympics and Celebrating Spring Festival.In the song of Love My Motherland China came gong and drum performances and lion dancing by Guangdong Association in Norway successively,attracting many locals to stop to watch.

摘要： 根据陕西省斗门水库引水管线的实际情况,采用HAMMER水力过渡分析软件对管线的水锤动态进行计算分析。结果显示,在长距离重力输水管线中为保障管道安全运行,在末端控制阀门旁安装旁通阀控制关阀时间,可有利于控制水锤高低压力值,有利于工程运行安全。

摘要： 重力输水工程中,关阀水锤引起压力骤升是影响输水系统安全性的重要因素.福建省某12.6万m3/d输水工程,沿线有两个分水口,输水距离总计13.3km,水源水库洪水位与受水区高差72 m.结合工程实例,运用Bentley HAMMER软件对系统进行关阀时间、关阀顺序模拟计算,根据模拟结果分析提出了有效防止系统发生水锤灾害的防护措施.结果表明,采用控制关阀时间及设置减压阀的防水锤措施后,有效的控制了水锤压力波动.

摘要： 水泵增压供水工程中,泵站发生断电事故工况下的水锤压力是影响系统安全性的重要因素.以某山区增压供水系统为例,运用Bentley HAMMER软件对系统进行事故停泵水锤计算,根据模拟结果分析提出了有效防止系统发生水锤灾害的防护方案.结果表明,采用控制泵后关阀时间及优化空气阀设置的防水锤措施后,有效的控制了水泵倒转及水锤压力波动.

摘要： 高压供水工程中水锤压力是影响系统安全性的重要因素,尤其在泵站发生断电事故工况下的水锤问题最为严重。以某山区四级压力供水系统中第一级增压供水系统为例,运用Bentley HAMMER软件对系统进行事故停泵水锤计算,根据模拟结果提出了有效防止系统发生水锤灾害的防护方案。结果表明,采用水力空气罐、速闭止回阀及空气阀共同作为防水锤措施有效的控制了水泵倒转及水锤压力波动。

摘要： 本文在详细阐明水锤分析过程中涉及到的有关复合管道材料及矿浆介质等的各项关键物理参数的求解过程的基础上,结合Hammer软件,使用特征线法,通过分析停泵水锤与关阀水锤对系统的影响,有针对性地提出适用于矿山工程尾矿输送管线的水锤解决方案,为尾矿输送管线的设计以及安全可靠运行提供有力的工程依据.

摘要： There once was a little boy who had a bad temper.His father gave him a bag of nails and told him that every time he lost his temper,he must hammer a nail into the back of the fence.The first day,the boy had driven 37 nails into the fence.Over the next few weeks,as he learned to control his anger,the number of nails hammered daily gradually dwindled down.

摘要： Schmidt Hammer Lassen（SHL）建筑事务所公开其在美国的第一个项目--门罗区开发规划设计,这将是底特律市中心复兴和未来发展中的一个综合性代表建筑群.为了更好地将室内外空间连接起来,SHL的方案包括几十年来底特律第一座高层办公大楼,拥有480多户的住宅单元,以及新的公共广场和绿化空间.

摘要： 丹麦建筑设计公司Schmidt Hammer Lassen Architects（SHL）日前击败隈研吾、大卫·齐伯菲尔德、多米尼克·佩罗等竞争对手,赢得了上海图书馆东馆的设计竞标并宣布了获胜方案。

摘要： In the impact tests of soft materials, we sometimes observe a thorn shape in the rising segment of the impact force waveform. However, the reason for the occurrence of the thorn shape has not been made clear. In this study, thorn-shape waveforms of several soft materials are measured using compact drop test equipment under the condition of a flat frontal impact. A flat frontal impact is the condition where a drop hammer with a flat bottom surface strikes a plate-like soft material in the normal direction. Synchronized impact forces are measured using two sensors installed on both the drop hammer side and the floor side. The examined soft materials are a sponge sheet, sponge rubber sheet, gel sheet, rubber sheet, flat oil clay, low-rebound urethane foam, cork sheet, sliced ham, pork ham steak, and pork. Based on the test results, the features of the thorn-shape waveforms are discussed from a bird’s-eye view. Furthermore, the occurrence mechanism of the thorn-shape waveforms is discussed from the viewpoint of viscosity discontinuity and the double-strike phenomenon.