RAS: A Robotic Assembly System for Steel Structure Erection and Assembly
In the current state of practice, steel workers must stand on an unfinished structure to assist with the assembly of structural elements manually. To prevent workers from having to work in a high place, we have developed a robotic assembly system (RAS) for steel beam erection and assembly. The RAS consists of four methods: rotation, alignment, bolting, and unloading. The system is built in a scaled experimental construction site to validate its feasibility. The results show that the RAS can operate the assembly process without humans working at risky heights, and can complete faster than the traditional method.
Using Photometric Stereo Method in Evaluating the Volume of Potholes
For the purpose of avoiding inappropriate pothole patching, we proposed a method to measure the volume of a pothole. Our method applies photometric stereo technique by using only a camera and couples of spotlights to achieve the purpose. By processing a set of a pothole’s top view images taken with exact same viewing angle but different illumination angles, photometric stereo technique can be used to generate the 3D model of the pothole. Result showed that models of potholes can be rebuilt by proposed method; however, it needs further improvement in its accuracy of volume measurement. Furthermore, our method may enhance the possibility of developing an autonomous inspection and repair system as well as a cost estimation method for pothole patching activities.
Visual Awareness on Surface Flow Measurement
Flow velocity is one of the key factors in hydrology. Considering workers’ on-site safety, non-contact methods have become the major approach for flow velocity measurement. We proposed a surface flow measurement method that takes advantage of human visual awareness to measure flow velocity. People can mark the flow features on images using the measurement tool we developed to acquire flow velocity.
Crowd-Based Velocimetry for Surface Flows
In this research, we developed a method called crowd-based velocimetry (CBV) to incorporate the human perception capacity in the estimation of the flow velocity. CBV includes three main steps: video processing, crowd processing, and statistical processing. We validated CBV by measuring a fast, steady, and uniform river surface flow in an artificial canal. The results show that the deviation of the surface flow rate measured by CBV is smaller than Particle image velocimetry(PIV) which is an image-based flow velocity measurement method. With rapidly improving mobile devices, CBV allows enormous numbers of people to engage in flow measurement, making CBV more reliable, more efficient, and more economical.
Early Warning Method and Device to Prevent Wheelchair from Tipping Over
An early warning method and a device for preventing a wheelchair from tipping over are described. The early warning method includes projecting a laser light pattern, scanning the laser light pattern, making a comparison to determine whether the ground is a barrier terrain, and issuing an early warning to the user in situations of risk. The early warning is generated and is one selected from a group consisting of a beep, a warning message and a vibration to alert the wheelchair user to the danger of the barrier terrain.
Fast Crane and Operation Method for Same
Cranes are one of the most heavily used instruments in construction base sites. Because so many construction activities rely on cranes for moving materials, the efficiency of the crane operation can influence the entire project process. Therefore, we provided a fast crane and an operation method for the same. The operation method includes calculating a pendulum period and moving the object. The pendulum period of the cable is calculated. The object is moved with an acceleration during an active time based on the pendulum period.