Optimizing preventive maintenance policy: A data-driven application for a light rail braking system

This article presents a case study determining the optimal preventive maintenance policy for a light rail rolling stock system in terms of reliability, availability, and maintenance costs. The maintenance policy defines one of the three predefined preventive maintenance actions at fixed time-based intervals for each of the subsystems of the...

Large-Scale ADS-B Data and Signal Quality Analysis

To investigate the contradicting findings of previous studies that investigated ADS-B quality, a study was per-formed to analyze the data and signal quality of ADS-B. For this study, a large dataset of raw ADS-B messages was analyzed, regarding the quality of the data and the signal, differentiating between internal and external sources of...

The nonlinear effect of combining uncertainties on the energy yield of an offshore wind farm

Offshore wind energy is expected to grow in the coming years: future plans for offshore wind farms total more than 98 GW. Financing is needed to realise these plans. Investment decisions partly depend on the uncertainty in energy yield predictions. It is therefore important that these energy yield predictions and their corresponding uncertainty...

A non-conservative software-based approach for detecting illegal CFEs caused by transient faults

Software-based methods for the detection of control-flow errors caused by transient fault usually consist in the introduction of protecting instructions both at the beginning and at the end of basic blocks. These methods are conservative in nature, in the sense that they assume that all blocks have the same probability of being the target of...

Maximizing operational readiness in defense aviation by optimization of flight and maintenance planning

The primary objective of a defense aviation operator or air force, is to maximize its continued readiness to successfully perform military flight operations, whenever and wherever the home state or international community calls for it. In order to maintain a satisfactory level of operational readiness, air forces need to ensure that sufficient...

Optimizing the maintenance policy for light rail rolling stock at HTM

This thesis describes a method to find the best maintenance policy for a light rail rolling stock system based on reliability, availability, and maintenance cost. The objective of this maintenance policy is to maintain a minimum required level of system reliability at minimum maintenance cost and maximum availability. The maintenance policy...

IMS messaging gateway in the Cloud

For mobile messaging service providers to endure in a competitive and dynamic market, it is vital to be flexible, which involves keeping up to date to technological developments, and to be cost effective. In order for service providers to provide highly available service, the use of Cloud computing technology is a well-suited solution. Cloud...

RAMSSHEEP analysis: A tool for risk-driven maintenance. Applied for primary flood defence systems in the Netherlands

Introduction Floods are a threat to millions of people who live in lowlands like the Netherlands. Therefore the Dutch government has been given re-quirements for primary flood defence systems like dikes. The current condition of most of these dikes does not fulfill to these requirements based on flood risk analyses of RWS. The most logical step...

Designing an interface for Greetinq's voicemail product

The project was on expanding the service of Greetinq's voicemail product. The product allowed users to set multiple welcome messages for their callers. In this project, voicemail, its use and applications for this product have been explored. The end result is a service which allows users to control their availability better through the use of...

Implementing reliability, availability, maintainability and supportability RAMS for the MRO industry: A case study at European Airlines

The availability of GNSS in urban environments and the effects of receiver acquisition time reduction

A computer simulation model is developed to investigate the urban availability of GNSS and to determine the effects of receiver reacquisition time reduction on this availability. On the basis of the obtained simulation results basic ideas for an GNSS-based urban positioning system are given