This paper describes two prototype applications based on Virtual Reality (VR) technology for use in construction and maintenance planning of buildings. The first, applied to construction, is an interactive virtual model designed to present plans three-dimensionally (3D), connecting them to construction planning schedules, resulting in a valuable asset to the monitoring of the development of con...

This paper develops an approach that enables an aerial vehicle to carry out 3D surface inspections. Given a 3D environment with a set of objects that need to be inspected, and an inspection quality 0 < α < 1, the objective is to compute a set of waypoints whose joint visibility ratio is at least α and a dynamically-feasible and collision-free trajectory that enables the aerial vehicle to reach ...

for the 2 ASRANET Colloquium KEYNOTES Risk based inspection planning, fatigue deterioration, Bayesian decision theory, structural reliability ABSTRACT Engineering systems are ideally designed to ensure an economical operation throughout the anticipated service life in compliance with given requirements and acceptance criteria. Such acceptance criteria are typically related to the safety of pers...

This paper presents issues and tradeoffs in attempting to achieve lean production by increasing productivity and reducing costs and waste while at the same time operating with resilience in the face of disruptions. A simple mathematical model of the operation of a production system is proposed, which incorporates two types of disruptive events: resource breakdowns and quality loss. The model is...

Within this paper, the problem of 3D structural inspection path planning for distributed infrastructure using aerial robots that are subject to time constraints is addressed. The proposed algorithm handles varying spatial properties of the infrastructure facilities, accounts for their different importance and exploration function and computes an overall inspection path of high inspection reward...

This paper introduces a hierarchical optimization algorithm to an open NP-hard 3D guarding problem for massive data sets. The proposed hierarchical integer linear programming (HILP) algorithm can find the fewest spots necessary to cover an entire given 3D region. Efficiently solving this problem can greatly benefit autonomous pipeline monitoring and inspections. Unlike most existing pipeline in...