交通速度弯沉车（TSD）
交通速度弯沉车（TSD），是创新型滚轮式弯沉测量仪，检测路面对于所加荷载的响应。丹麦格林伍德工程公司开发的TSD技术独占鳌头，开启了全球路面工程领域的范式转移。
格林伍德TSD检测时汇入正常车流，能够同时在路网级和项目级提供连续的承载力数据结果，具备优异的成本效益。
同步查看路网结构和功能状况
TSD输出可复验、精确、详尽的数据，从中可导出承载力参数并预估路面疲劳/残余寿命。此类信息是决策路段修复位置和养护时机的关键。
国际上，大量研究揭示，制定养护计划时应基于结构数据，专注解决公路潜在的问题而不是仅仅修复路面表面症状，才能显著节约养护成本和大幅提高成本效益。
TSD能够快速识别薄弱路段，从而把握预防性养护的正确时机。
这个案例是虚构的。
TSD delivers back-calculated strains down to centimeters
Based on the measured layer thicknesses and pavement response data, the pavement strains and the elastic moduli of each layer can be found using Greenwood’s own viscoelastic back-calculation algorithm.
Having access to detailed back-calculated results at the network level makes it possible to make reliable life-time analyses for the entire road network and to identify appropriate preventative measures in every instance.
When ‘the full picture’ is known for every part of the road network, it is possible to plan pavement maintenance without any unknowns and to use maintenance funds in a truly smart way.
Examples: Fatigue strain with 5 cm intervals. Bearing capacity and the pavement layer thicknesses can be measured in one go.
连续式测量，检测速度可达80km/h (50mph)，
不影响正常交通
Effective calculation of strains and e-moduli from TSD measurements
Greenwood Engineering has developed ViscBackCalc, the world’s first online service capable of running visco-elastic back calculation on TSD measurements for precise prediction of pavement distress at network level. It´s a very fast and easy way to calculate the structural properties of the road network.
ViscBackCalc allows users to upload TSD-measurements and apply visco-elastic back calculation to the entire chainage and download calculated fatique- and rutting strains, e-moduli and slopes. The service also allows for correlation to models derived from FWD. It also generates plots for deflections, slopes and strains and allows for temperature compensation and dynamic layer information e.g. from a ground penetrating radar.
联系 vbc@greenwood.dk for more information or to request access to the service.
Learn more how to get effective calculation of strains and e-moduli from TSD measurements
高效率。低成本。
TSD检测时能够跟随正常交通车流，每个工作日可完成几百公里的检测，只需两个工作人员操作-一个驾驶员和一个检测员-无需其他人员协助封闭车道或放置道路警告标志等。
这使TSD检测具备高效率和低成本优势。与传统打点离散式测量设备相比，每公里检测成本更低，使用更加经济。
检测原理
交通速度弯沉车测量弯沉速度而不是弯沉位移。为了测量路面移动，TSD应用了多普勒效应原理：信号源的移动造成信号源产生的波长的变化。
在TSD系统内，多普勒激光器发射良好描述的信号至移动着的路面，随后接收反射回的激光信号。根据路面移动速度不同，接收到信号的波长发生了相应变化。
应用这种方法，公路路面纹理和粗糙度就不会影响TSD测量承载力的精度。
新款TSD设备安装有10个或10个以上的多普勒激光器，同时测量载荷车轮前后的路面移动，生成完整的弯沉盆曲线。
SCI300和更多参数。精确和可复验
TSD系统提供弯沉盆的完整图形，输出常见数值包括路面曲率指数（SCI300），最大弯沉值（D0）及其他参数。通过将多普勒激光器沿挂车双轮纵向中心线，安装在载荷车轮的前后，才可得以实现。
SCITSD is the new structural curvature index for strain analysis of large road networks and airfields developed by Greenwood Engineering. It is well suited for rolling wheel deflection (RWD) experiments as performed by the Traffic Speed Deflectometer.
路网检测示例
SCITSD vs. tensile strain at the bottom of the top layer. SCITSD is proportional to the strain, since they are both derived from the curvature of the deflection bowl, this means that the tensile strain can be calculated directly from SCITSD shown as the green curve.
Besides the GPR it is possible to include optional equipment as Surface Imaging System (SIS), Right Of Way Camera (ROW) etc. for collection of a full set of synchronised road data in one drive.
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More than 20 TSDs worldwide and counting...
The first TSD was delivered to the Danish Road Directorate under the Ministry of Transport in 2004. Since then, the development has continued and the experience has grown as more than a dozen TSDs are now in operation for various research projects and maintenance optimization tasks in USA, South Africa, Australia, China, England, Germany, Italy, Poland, Sweden and Denmark.
Did you know that the TSD can be employed in airport environments?
The TSD accurately assesses the structural integrity of runways, taxiways, and aprons. This advanced technology enables a comprehensive evaluation, offering a full picture of the runway condition to facilitate informed maintenance decisions, ensuring safety and durability with minimal lane closure.