Integration of Imaging and Simulation for Earthmoving Productivity Analysis

Abstract

Earthwork productivity varies depending on a unique geologic condition, types of earthwork equipment, and an equipment allocation plan. For this reason, it is difficult to accurately estimate the productivity of an earthwork. To address this issue, this paper develops an imaging-to-simulation method in which a real jobsite data is automatically collected and used for analyzing the earthwork productivity. Object existence and its location in image data are identified by convolutional networks, and they are used to infer the earthwork context. The context information is transformed into the simulation input by the context reasoning processes. A productivity report is produced by using the WebCYCLONE simulation. The developed method was tested in a tunnel construction site, providing a new equipment allocation plan, which minimize the cost and time compared with the original plan.

Modelling and Fast Terminal Sliding Mode Control for Mirror-based Pointing Systems

“…1). The results of the real-time experiment were presented in our previous study [3], and interested readers can refer to the research article for the details on the experimental setup. Comparison of the ISE values of the controllers are presented in Table II.…”

“…Owing to the faster responses of such devices, they can improve thermoelastic stress analysis (TSA) of mechanical structures for their structural health monitoring and fatigue analysis. Particularly, such pointing sensors can provide blurfree images of structure-under-test during TSA by compensating its motion [3].…”

“…The tracking response of the system is close to the step signal which can be verified by observing at the zoomed section of the plot. The details on the design and architecture of the MPC for the mirror based pointing system can be found in [3]. Similarly, for TSM, we implemented the control law presented in [6].…”

Estimation of the excavator actual productivity at the construction site using video analysis

“…Construction is generally considered to be conducted in highly challenging site conditions, because of the machineries involved in operation, transfer of materials, moving workers, and changing status (Kim H. et al 2014). It is difficult to accurately estimate the productivity of an earthwork, because earthwork productivity varies depending on the unique geologic conditions, types of earthwork equipment, and equipment allocation plan (Kim H. et al 2018a). Therefore, when planning the performance of earthworks, it is quite a challenging task to accurately predict and estimate soil and rock categories, weather impact, productivity of construction machinery, as well as required time and cost.…”