Abstract
With the development of mechatronic systems, different kinds of subsystems within them are highly correlated to each other due to the demand for the special function. To assess the robustness in the mechatronic system under various disturbances, we build an interdependent mechatronic system as an interdependent machine-electricity-communication network (IMECN) and adopt the improved cascading failure model where the occurrence of the failure propagation is decided by a proportion threshold δ. In order to fully explore the robustness under different disturbances, we develop attack strategies concerning nodes, edges, and interdependent links by considering measures for a node. Then, we also define the robustness metric to quantify the performance of IMECN during the entire attack process. The mass transit vehicle is taken as an example to investigate the impact of attack strategies on the robustness at different δ in a real-world mechatronic system. It is found that each subnetwork in this IMECN has a scale-free property. Based on simulation results, we obtain the most efficient attack strategies to remove nodes, edges, and interdependent links for different possibilities of triggering the failure propagation. In addition, we find that the attacks on nodes and interdependent links make IMECN more vulnerable compared with the ones on edges. This work provides theoretical insights into the comprehensive analysis of the robustness in interdependent mechatronic systems.
Highlights
Interdependent mechatronic systems, such as a mass transit vehicle and an airplane, are the backbone of modern society as they provide essential services for our life. ese systems consist of a tremendous amount of equipment and there exist complex interactions between units
When δ increases to a large value (i.e., δ ≥ 0.2), Figure 2(c) depicts that the curve of ND is lower than others no matter what t is and the interdependent machine-electricity-communication network (IMECN) becomes paralyzed after just five nodes with the high degree are attacked, which implies that the degree is a key measure for identifying the crucial node whose failure has a negative effect on the robustness in the case of the wide spread of failures. e main reason is that
Based on the comparison of R under attack strategies with regard to the node, the edge, and the interdependent link, we find that the values of R under attack strategies concerning the node and the interdependent link are smaller than the ones under attack strategies concerning the edge for different δ, indicating that the robustness of IMECN is more sensitive to the attack on the node and the interdependent link. e major reason is that the attack on a node causes the failures of more than one edge in general and equates to attacks on several edges
Summary
A Comprehensive Analysis of Robustness in Interdependent Mechatronic Systems under Attack Strategies. In order to fully explore the robustness under different disturbances, we develop attack strategies concerning nodes, edges, and interdependent links by considering measures for a node. E mass transit vehicle is taken as an example to investigate the impact of attack strategies on the robustness at different δ in a real-world mechatronic system. We obtain the most efficient attack strategies to remove nodes, edges, and interdependent links for different possibilities of triggering the failure propagation. We find that the attacks on nodes and interdependent links make IMECN more vulnerable compared with the ones on edges. Is work provides theoretical insights into the comprehensive analysis of the robustness in interdependent mechatronic systems We find that the attacks on nodes and interdependent links make IMECN more vulnerable compared with the ones on edges. is work provides theoretical insights into the comprehensive analysis of the robustness in interdependent mechatronic systems
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