کنفرانس مهندسی برق ایران

صفحه اصلی / سی و چهارمین کنفرانس بین المللی مهندسی برق

Enhanced Reliability Optimization in TMR Series Systems through Shared Spares and Hybrid Redundancy Strategies

نویسندگان :

Mohammad Amin Khayyamirad¹ Siavash Es'haghi² Mehdi Khatir³ Mahdi Karbasian⁴

1- dept.of electrical engineering SR.C., Islamicname Azad University Tehran, Iran 2- dept.of electrical engineering SR.C., Islamicname Azad University Tehran, Iran 3- dept.of electrical engineering SR.C., Islamicname Azad University Tehran, Iran 4- Department of Industrial Engineering, Malek Ashtar University of Technology, Tehran, Iran.

کلمات کلیدی :

Shared Spare Pool،TMR،CTMC،Hybrid Redundancy Strategies،RAP

چکیده :

Ensuring high reliability in safety-critical digital systems is increasingly difficult as CMOS technology scales, making circuits more vulnerable to transient and permanent failures. While Triple Modular Redundancy (TMR) is a standard solution for fault masking, traditional approaches often utilize dedicated spare pools for individual subsystems, leading to inefficient resource utilization. This paper proposes an enhanced reliability optimization framework using a shared spare pool across series-connected identical TMR subsystems. Our approach integrates hybrid redundancy strategies, including active, cold standby, mixed, and k-mixed configurations, while explicitly accounting for imperfect switching reliability. By modeling the system using Continuous-Time Markov Chains (CTMC) and optimizing configurations via a genetic algorithm, we demonstrate that pooling spares exploits the statistical independence of subsystem failures to improve efficiency. Experimental results indicate that the proposed shared strategy provides substantial reliability gains, outperforming dedicated allocation by up to 49% under identical cost and power constraints. These findings offer a practical enhancement for extending the mission time of resource-constrained systems in aerospace and industrial applications.

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