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4 results on '"dual redundancy"'

1. Magnetic-coupling characteristics analysis of a dual redundancy axial flux permanent magnet synchronous motor

Author

Yufeng Zhang, Wentao Gao, Qingpin Meng, Zihui Wu, Qixun Zhou, Guanghui Du, and Haoxiang Cao

Subjects
Permanent magnet synchronous motor, Dual redundancy, Magnetic coupling, Finite-element method (FEM), Self-inductance and mutual-inductance, Electrical engineering. Electronics. Nuclear engineering, TK1-9971
Abstract

The permanent magnet synchronous motor (PMSM) is widely used as the driving device for electric vehicles, robots and other systems due to their high-power density and wide speed range. In order to improve the reliability of PMSM, redundant structure can be used. In this paper, a topology of dual-redundant axial flux PMSM (DR-AFPMSM) and a analytical method for magnetic coupling characteristics was proposed. To reduce the axial length and the magnetic coupling between the two redundancies, the middle rotor disk consists of a set of permanent magnets (PMs) embedded in a coreless skeleton. From the perspective of inductance and armature reaction, the magnetic characteristics of each redundancy and the magnetic coupling between redundancies have been analyzed by 3-dimensional finite element analysis (3D-FEA) in this paper. Tests under different conditions, namely no-load, load, and phase-to-phase short-circuit have been carried out. Results show that the prototype meets the design requirements and the proposed structure can effectively decrease the magnetic coupling between the two redundancies.

Published
2022
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2. Design of a digital coal mine safety monitoring and control system

Author

WEI Feng

Subjects
coal mine safety monitoring and control, dual redundancy, can bus redundancy, multi-master communication, intelligent sensing, Mining engineering. Metallurgy, TN1-997
Abstract

For poor real-time communication, stability and anti electromagnetic interference performance of existing coal mine safety monitoring and control system, a digital coal mine safety monitoring and control system was proposed, and hardware scheme, software scheme and key technologies of the system were introduced. The system adopts dual redundancy structure of CAN bus and industrial Ethernet ring network, and takes LPC2294 ARM processor and μC/OS-Ⅱembedded operation system as cores. The test results show that communication success rate of CAN bus is 99.97% as well as utilization ratio is 40%-60% of the system with 10 km CAN bus, 32 digital substations and 200 sensors and actuators. The system can run 40 days continuously with stable data communication and without interrupted and abnormal data, and technique indexes of the system meet requirements of AQ 6201-2006 General technical requirements of coal mine safety monitoring and control system.

Published
2017
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3. Design of highly redundant fault tolerant control for aircraft elevator system

Author

Muhammad Tayyeb, Arslan Amin Ahmed, Omer Saleem, Muhammad Arslan, Muhammad Shahbaz Hamza, and Umar Riaz

Subjects
modified triple modular redundancy, Technology, Computer science, Control (management), 0211 other engineering and technologies, Transportation, ComputerApplications_COMPUTERSINOTHERSYSTEMS, 02 engineering and technology, elevator control system, Control theory, 021108 energy, Safety, Risk, Reliability and Quality, fault tolerant control, Civil and Structural Engineering, Renewable Energy, Sustainability and the Environment, elevator fault detection, redundancy, Mechanical Engineering, General Engineering, Fault tolerance, Elevator system, 021001 nanoscience & nanotechnology, Engineering (General). Civil engineering (General), dual redundancy, TA1-2040, 0210 nano-technology
Abstract

Elevators are surfaces of flight control, typically at the rear of an aircraft to control the pitch of the plane, the angle of attack and the wing lift. The most critical actuation device is longitudinal aircraft control, and its failures will result in a catastrophic aircraft crash. This paper proposes a Highly Redundant Fault Tolerant Control (HRFTC) policy for the aircraft to accommodate faults in the critical sensors and actuators. Modified Triple Modular Redundancy (MTMR) has been proposed for the sensors and Dual Redundancy (DR) has been proposed for the actuators. The working of control laws, pilot order, signal conditioning, and failure are elaborated. Furthermore, the PID controller is used for the adjustment of the position of the elevator by comparing it with a set point. The results show that when a fault occurs, the system detects it successfully and tolerates it quickly without disturbing the flight of aircraft. The study is significant for the avionics industry for manufacturing highly reliable machines for human and environmental safety.

Published
2021

4. A Novel Design of Retrofit Hang-off Structure for Steel Catenary Risers.

Author

Chen, Jack, Sriraman, Sharan R., Jukes, Paul, Clark, Robert, and Lange, Steven

Abstract

The article discusses a study that presented a novel design of retrofit hang-off structure to tie-back Steel Catenary Risers (SCR). It discusses the key features of the SCR clamp, including the clamp body, support baskets and tubular bracing members. The study showed that this approach has the ability to significantly reduce the welding requirements and steel material usage.

Published
2010

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