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The purpose of this study was to investigate the effect of morning-night differences and sleep deprivation on situation awareness and driving performance. Twelve male students (mean of age 21.0±0.7 years old) participated in this study. They drove in following driving scenarios under three conditions: night condition, morning condition with and without sleep deprivation, on a driving simulator. Statistical...
Economic affordability is a crucial factor for repairable systems. Previous work about economic life prediction of systems mainly concerned about cost models, regardless of system structure or components' relationship. In this paper, a new economic life prediction method has been proposed with combination of a maintenance model and an accumulative damage model. The maintenance model is to depict the...
A two dimensional maintenance contracts with coordcination between two parties is studied in this paper. The contract is applied to a dump truck operated in a mining industry. The situation under study is that an agent offers two dimensional service contract to the owner of the truck. The owner's decision to get high availability and the agent's decision to minimize the total maintenance cost are...
We need energy resources to assure performance of mechatronic systems. The performance assurance is of major importance in present systems since it leads to high availability and capability. It also helps to reduce failure occurrence. In the article we want to find the up state time of Li-ion batteries. Results are related to influence of the operating environment at different climatic levels. We...
When using acceleration in a degradation test, additional parameters are needed to incorporate the accelerating variables into the degradation process, requiring more statistical information to achieve the same level of estimation precision. When the increase of statistical information due to acceleration fails to compensate the information consumption caused by the additional parameters, acceleration...
Professional engineering service-delivering firms (PESDFs) that provide knowledge-intensive technical services to oil and gas (O&G) operators are under pressure to deliver their services/products in a more effective and efficient way, especially in the current oil crisis situation. While the objective of the firms is to deliver the highest value to their clients, waste is still embedded in the...
Solar cell is the basic component of satellite photovoltaic panels with complicated redundant system structure. Its reliability plays an important role in the system, and its performance shows a degradation trend over time. In this paper, study is conducted for the solar cell degradation modeling and reliability analysis based on practical testing results. Specifically, we illustrate an accelerated...
Inelastic recovery behavior of seamless tubes has been investigated by uniaxial tensile tests. Unloading stress-strain curves for different plastic strain reveals that the percentage of inelastic recovery to the total recovery increases with plastic deformation. The results of this study concludes that with increase in plastic strain, Young's modulus reduces drastically first then reduces somewhat...
This paper aims to develop a parameter estimation approach for load-sharing systems subject to continuous degradation. The system consists of multiple components in parallel structure. The components of the system suffer a degradation process, characterized respectively by Wiener process and Inverse Gaussian process. When components fail one by one, the total workload is redistributed among the remaining...
In this paper, the characteristics of the kinetic reliability of space four-links mechanism are analyzed and the relationship between the kinetic accuracy and wear clearances in joints is explored, using Advanced First Order and Second Moment (AFOSM) method and Monte-Carlo Simulation (MCS). The Archard wear model is applied to analyze the increasing wear clearances in joints; and the function between...
The prediction of reliability for rubber O-rings used in the rockets is of great significance for the life assessment of the rockets. In this paper, rubber O-rings were aged under accelerated conditions at temperatures ranging from 60°C to 80°C. And a new model based on Wiener process with a time scale transformation was presented to describe the degradation of CS (compression set) which is the characteristic...
Burn-in is an effective method to eliminate initial mortality and reduce field failure costs. As many products have been designed to be extremely reliable, traditional burn-in would almost not get a sufficient amount of failure data in a reasonable duration. If the failure associated with a degradation process, degradation-based burn-in can be implemented. Moreover, we hope the quality level of the...
A method fusing life data and expert information was proposed to estimate residual life of some kinds of single machine on satellite platform, which solved the problem that performance degradation information of these products could not be detected real-time and the life data collected were almost no-failure data. Firstly, expert information about reliability was transformed into prior distributions...
Space electronic products usually should meet the mission requirements of long life and low cost. Because of insufficient failure data, it is hard to assess the reliability precisely by using traditional reliability testing and statistical method. In this paper, a method of reliability assessment based on integration of highly accelerated life testing (HALT) and accelerated degradation testing (ADT)...
This paper studies a reliability analysis method for a system which experiences two dependent competing failure processes, including a random degradation process and a random shock process. Whether the soft failure or the hard failure take place, the system will fail. In our model, the arriving shocks can cause damage on degradation process, and the random shock process can be influenced by degradation...
This paper surveys the recent developments on condition-based maintenance (CBM) modeling of multi-component systems. The emphasis is on the deterioration modeling and maintenance policies of this problem. An analysis of important factors which may influence maintenance decisions is also given. CBM is known as a modern and effective maintenance technique which is based on the information collected...
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