| 查看: 791 | 回复: 4 | ||
| 当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖 | ||
lijunxue08金虫 (小有名气)
|
[求助]
求助翻译下面的内容
|
|
|
The GPS health monitoring system of Zhujiang Huangpu Bridge in China for the case study bridge is discussed in this section. This bridge is composed of a 705 m-long cable-stayed bridge and an 1108 m-long cable-suspended bridge. The width of deck and the height of towers for the Bridge are 34?5 and 195?476 m, respectively.There were 14 GPS units installed on the two bridges after August 15, 2009, including 13 rover stations and 1 base station as shown in Fig. 1. The distance between base station and point (107) is 1.00 and 1.50 km from point (101) according to Fig. 1.The reference station refreshes the RTK correction messages for the GPS monitoring stations with a frequency of 1 Hz via the optical fibre communication system. LEICA Geo-systems antennas and dualfrequency GPS receivers were used to observe the GPS satellite signals; the satellite elevation cut-off angle is 13u, at least nine satellites. The observations were split into single hour observations for the processing purposes. The data collected were mixed with that generated by the receivers’ own oscillators, and then LEICA Spider 2?1 RTK software was used to process RTK GPS data. The data collected are processed coordinates in World Geodetic System (WGS-84) and converted to the local coordinate system by the coordinate transformation, Ogundipe et al. [21] and Elsheimy [6] summarised the coordinate transformation system which was used in this case of study. A local bridge coordinate system was established to be used in the analysis and the evaluation of the observation data.The X data represent the relative displacement changes along the longitudinal direction of the bridge; the Y data represent the relative displacement changes along the transverse direction of the bridge while the Z data represent the relative displacement changes along the altitude direction of the bridge [11]. The outputs from GPS monitoring stations include monitoring point number and RTK GPS three-dimensional coordinates,GPS time, satellite status data, GPS receiver status data,and so on, and the raw GPS outputs, if required as shown in Fig. 2. The resonant frequency of the bridge is considered a very important parameter in the bridge structural and safety analyses. The relative displacement changes of the bridge deck will be in millimetres. |
回复此楼» 猜你喜欢
材料292调剂
已经有11人回复
-
269专硕求调剂
已经有9人回复
-
0703化学/290求调剂/本科经历丰富/工科也可
已经有8人回复
-
0856材料化工调剂 总分330
已经有7人回复
-
312求调剂
已经有13人回复
-
315调剂
已经有5人回复
-
307求调剂
已经有8人回复
-
材料与化工考研调剂
已经有16人回复
-
299求调剂
已经有3人回复
-
材料求调剂
已经有8人回复
dailun20
木虫 (正式写手)
- 翻译EPI: 2
- 应助: 22 (小学生)
- 贵宾: 0.001
- 金币: 2337.4
- 散金: 5553
- 红花: 5
- 帖子: 657
- 在线: 357.9小时
- 虫号: 1353845
- 注册: 2011-07-23
- 性别: GG
- 专业: 表面、形态与形貌分析
4楼2014-03-18 13:06:35
lijunxue08
金虫 (小有名气)
- 应助: 0 (幼儿园)
- 金币: 700.5
- 帖子: 71
- 在线: 33小时
- 虫号: 2459634
- 注册: 2013-05-11
- 性别: GG
- 专业: 地理信息系统
5楼2014-03-18 15:07:48
