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Control of Leading-Edge Shock of Train Using Deep Neural Network to Prevent Unstart Acha, Stefalo; Yi, Sun; Ferguson, Frederick
Control Systems and Optimization Letters Vol 2, No 3 (2024)
Publisher : Peneliti Teknologi Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59247/csol.v2i3.160

Abstract

The primary aim of this research is to create a comprehensive neural network model that can effectively regulate the position of the leading-edge shock in a scramjet by manipulating the required backpressure, thereby achieving, and maintaining hypersonic speeds. By utilizing computational fluid dynamic data, a dynamic model is constructed using a neural network-based approach to control the positions of the leading-edge shock train. The scramjet isolator, which is a duct where pressure increases from the inlet to the combustor via a series of shock waves, necessitates precise control of the leading-edge shock locations during scramjet operation. The model employed in this research project is a neural network adaptive controller implemented in MATLAB/Simulink software, which accounts for the nonlinear characteristics of the plant and predicts its future behavior. To enhance control performance, a robust controller is employed, integrating a learning rule that reduces the error percentage throughout the system's lifespan. The neural network is trained using flight behavior datasets, enabling it to learn from a set of training patterns. Plant identification is achieved through a neural network, capturing the system dynamics, and enabling the neural network to function as a controller. Additionally, the controller's performance is validated through simulations and optimization analyses. This research presents an adaptable, robust, and effective control system that provides added reliability and reduces disturbances.
Cooperative Intelligent Control of Multi-Agent Systems (MAS) Through Communication, Trust, and Reliability Acha, Stefalo; Yi, Sun
Control Systems and Optimization Letters Vol 3, No 1 (2025)
Publisher : Peneliti Teknologi Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59247/csol.v3i1.171

Abstract

The field of Multi-Agent Systems (MAS) has achieved significant advancements in modern research and development. This study focuses on enhancing trust evaluation, communication efficiency, and adaptive navigation in scenarios where agents have limited prior knowledge. Key contributions include the development of a high-intelligence MAS system that integrates key input data, such as real-time parameters regarding agents’ distances from one another, their distances to target locations, weather conditions, visibility, machine learning capabilities, positions relative to safe or unsafe environments for trust evaluation, delays in communication, and potential cyber threats. These factors trigger a dynamic topology-switching mechanism to secure agents or minimize communication delays in high-security operations. The MAS implements these strategies based on an adaptive communication model, enabling agents to execute various steps during data pooling effectively. Agents utilize real-time data to coordinate flock movements, ensuring dynamic and robust control through data pooling. For example, in a topology requiring a lead agent, the lead agent provides navigation instructions based on pooled data collected during mission execution. This data may involve repositioning proper area coverage, considering agents’ visibility, distance, or environmental disturbances. Four main topologies are implemented in this experiment: directed mesh with two lead agents (type A), directed mesh with one lead agent (type B), star topology (type C), and ring topology (type D). Type B and C topologies are well-suited for communication without delays or disturbances but perform poorly when the system experiences delays (e.g., noise disturbances exceeding a threshold frequency of 5 Hz). In contrast, type A and D topologies are more effective in handling communication delays. By implementing a topology-switching mechanism, this research streamlines the application of two or more topologies in real-life scenarios. It utilizes type B or C topologies in undisturbed conditions and switches to type A or D when perturbations occur. This optimization minimizes communication delays during mission execution and flight time. The research demonstrates significant improvements in trust evaluation, communication efficiency, and overall MAS performance, with implications across various domains, including image and video mining. In these areas, the integration of domain-specific agents enhances processes such as preprocessing, feature extraction, and interpretation. Results show improved accuracy and reliability in data analysis and decision-making across diverse applications, particularly in scenarios involving complex spatial objects and varying environmental conditions.