High-Speed Wired Drill Pipe and its Corresponding Manufacture & Test Technology Research

High-speed wired drill pipe and its corresponding communication technology not only can achieve high-speed transmission rate and high-capacity, but also can realize real-time monitoring and dual-way communication in whole section, which can prevent downhole problems effectively. As a series system, the homogeneity and robustness of these wired drill pipes are crucial. This paper focuses on how to overcome the difficulty in manufacturing process of information drill pipe and complete the validation test. In order to guarantee the quality of information drill pipe and satisfy the technological requirements of mass production, we optimize the manufacturing process and put forward reasonable test techniques. The optimizations of manufacturing process include the analysis on constant tension of pressure pipe, quantitative cutting pipe and perforation in pipe nozzle. The testing techniques includes magnetic coupling coil impedance test, high pressure test, communication performance test of both single pipe and series system. The test result can be judged and evaluated by the attenuation value of the signal attenuation test and the signal reflection waveform as well as sealing reliability. With the help of the optimization of the manufacturing process and the application of new tooling, the quality and robustness of information drill pipe is improved obviously. Pass rate in primary assembly is increased from 70% to 92%. After the second assembly, pass rate can be increased to 99.5%. Besides, the work efficiency is greatly improved and the process requirements of mass production are satisfied. The validation test can screen out the drill pipe with poor quality and performance effectively thus to improve the reliability of the whole system. By means of the improvement of manufacturing and the validation test, the comprehensive pass rate of information drill pipes is increased from 84% to 95%. During three field tests in Jilin and Daqing Oilfield, the information drill pipes functioned well and accomplished all the test tasks successfully. High-speed wired drill pipe can improve the downhole data transmission on a large margin. The theorical transmission rate can be up to 100 kbps, 10,000 times as much as the traditional mud impulse telemetry. The manufacturing optimization and test technology can guarantee the performance and realize downhole data highway.

Contagious Description: Factors Influencing the Adoption of the Australian Series System in New Zealand Archives

<p>The Australian series system has been identified as useful in describing the multiple relationships increasingly identified in archival collections due to complex administrative history, the need to describe electronic records or a wish to describe multiple views of a single group of archives. However, throughout New Zealand it has been fully adopted by relatively few Archives. A mixed-methods survey was carried out to investigate motivators and barriers to the adoption of the Australian series system, using quantitative and qualitative methods of analysis of responses to a questionnaire. Using Rogers’ diffusion of innovations theory and the records continuum model to suggest factors and map the results, it was found that the main motivator to use the AuSS was an archivist convinced of its value, through training or previous use, and with an awareness of archival conventions and standards. Other motivators included a large collection with a complex administrative history, the availability of compatible software, institutional support, and expert advice recommending its use. Barriers included lack of awareness or training, lack of autonomy for the archivist, and lack of resources. Changes to description occurred when particular moments of opportunity coincided with perceived needs. These factors worked together at all levels of the records continuum to affect decisions made by archivists on the type of description to use in their finding aids. Wider use of the AuSS to enable better information sharing and more fully-developed contextual description could be achieved through the provision of better publicised information; expert advice on implementation and on migration of existing data; and practical, readymade, simple and adaptable templates for finding aids.</p>

Contagious Description: Factors Influencing the Adoption of the Australian Series System in New Zealand Archives

<p>The Australian series system has been identified as useful in describing the multiple relationships increasingly identified in archival collections due to complex administrative history, the need to describe electronic records or a wish to describe multiple views of a single group of archives. However, throughout New Zealand it has been fully adopted by relatively few Archives. A mixed-methods survey was carried out to investigate motivators and barriers to the adoption of the Australian series system, using quantitative and qualitative methods of analysis of responses to a questionnaire. Using Rogers’ diffusion of innovations theory and the records continuum model to suggest factors and map the results, it was found that the main motivator to use the AuSS was an archivist convinced of its value, through training or previous use, and with an awareness of archival conventions and standards. Other motivators included a large collection with a complex administrative history, the availability of compatible software, institutional support, and expert advice recommending its use. Barriers included lack of awareness or training, lack of autonomy for the archivist, and lack of resources. Changes to description occurred when particular moments of opportunity coincided with perceived needs. These factors worked together at all levels of the records continuum to affect decisions made by archivists on the type of description to use in their finding aids. Wider use of the AuSS to enable better information sharing and more fully-developed contextual description could be achieved through the provision of better publicised information; expert advice on implementation and on migration of existing data; and practical, readymade, simple and adaptable templates for finding aids.</p>

Self-adaptively Commensal Learning-based Jaya Algorithm with Multi-populations and its Application

Jaya algorithm is an advanced optimization algorithm, which has been applied to many real-world optimization problems. Jaya algorithm has better performance in some optimization field. However, Jaya algorithm exploration capability is not better. In order to enhance exploration capability of the Jaya algorithm, a self-adaptively commensal learning-based Jaya algorithm with multi-populations (Jaya-SCLMP) is presented in this paper. In Jaya-SCLMP, a commensal learning strategy is used to increase the probability of finding the global optimum, in which the person history best and worst information is used to explore new solution area. Moreover, a multi-populations strategy based on Gaussian distribution scheme and learning dictionary is utilized to enhance the exploration capability, meanwhile every sub-population employed three Gaussian distributions at each generation, roulette wheel selection is employed to choose a scheme based on learning dictionary. The performance of Jaya-SCLMP is evaluated based on 28 CEC 2013 unconstrained benchmark problems. In addition, three reliability problems, i.e. complex (bridge) system, series system and series-parallel system are selected. Compared with several Jaya variants and several state-of-the-art other algorithms, the experimental results reveal that Jaya-SCLMP is effective.

Solving Cold-Standby Reliability-Redundancy Allocation Problems with Particle-Based Simplified Swarm Optimization

Particle swarm optimization (PSO) and simplified swarm optimization (SSO) are two of the state-of-the-art swarm intelligence technique that is widely utilized for optimization purposes. This paper describes a particle-based simplified swarm optimization (PSSO) procedure which combines the update mechanisms (UMs) of PSO and SSO to determine optimal system reliability for reliability-redundancy allocation problems (RRAPs) with cold-standby strategy while aimed at maximizing the system reliability. With comprehensive experimental test on the typical and famous four benchmarks of RRAP, PSSO is compared with other recently introduced algorithms in four different widely used systems, i.e., a series system, a series-parallel system, a complex (bridge) system, and an overspeed protection system for a gas turbine. Finally, the results of the experiments demonstrate that the PSSO can effectively solve the system of RRAP with cold-standby strategy and has good performance in the system reliability obtained although the best system reliability is not obtained in all four benchmarks.

Evaluation of Failure Probability in Series System of Three-Axle Trucks under Strong Crosswind

The probability of wind-induced failure accidents in three-axle trucks under pulsating strong crosswinds and the corresponding critical safe speed are investigated in this study. Reliability theory and random fuzzy methods are utilized to establish the membership function of the failure probability in the series system (FPSS) composed of rollover, side-slip, and rotation failure accidents. The Kaman spectrum is used to realistically simulate the fluctuating wind time history curves of different average speeds. Four factors affecting the six-component force coefficient of the three-axle truck and the crosswind load are considered: fluctuating average wind speed, wind direction (angle), truck driving speed, and road adhesion coefficient. A three-axle truck nonlinear model is established accordingly. The model is used to obtain the dynamic response of the three-axle truck under strong crosswind conditions as per the time-varying curves of the vertical load of the truck, the time-varying curves of the lateral displacement of the center of mass, and the time-varying curves of the heading angle. An advanced Monte Carlo simulation algorithm based on importance sampling is used to determine the probability of a three-axle truck with FPSS under strong crosswinds; the given acceptable probability of failure (accident) is used to obtain the critical safety speed. The sensitivity analysis of random variables reveals that the possibility of three truck failures of the three-axle truck in strong crosswinds is, from largest to smallest, rollover, side-slip, and rotation. This research may provide useful guidance for exploring the probability of wind-induced accidents and the critical safety speeds of vehicles, as well as useful general information for road transportation management departments.