On Time-Synchronized Stability and Control

ADP-Based Spacecraft Attitude Control Under Actuator Misalignment and Pointing Constraints

“…Attitude reorientation control is an essential technology for a broad range of space missions, which has drawn wide attention in the past several decades [1]. Various control approaches, such as adaptive control [2] and sliding mode control (SMC) [3], [4], have been designed to address attitude reorientation problems. In realistic applications, because of the increasing complexity of the on-orbit missions, attitude control policy not only requires to complete the basic reorientation, but also should consider other practical cases, such as control cost reduction, actuator mounting, and onboard instruments' safety.…”

Cooperative Manipulation of Deformable Objects by Single-Leader–Dual-Follower Teleoperation

“…Since these two follower robots are in physical interaction through a common object, DFR's movement may be estimated by AFR using the information of interaction force. Moreover, as for manipulation of deformable objects such as organs, tissues, cables and household laundries [18]- [20], researchers presented practical methods to endow the manipulator with touching sense [21] and achieve high-precision force tracking when interacting with soft objects [22] [23]. These works shared the same idea that a robot can use the contact force to modulate its movement.…”

Predefined‐time tracking control for high‐order nonlinear systems with control saturation

“…To solve this issue, a more potent algorithm named fixed-time control has gained considerable consideration, whose settling-time function is bounded. Furthermore, scholars have achieved a lot of research results by using fixed-time control theory, [22][23][24] especially in the field of nonlinear systems with uncertainties, [25][26][27] disturbance, 28,29 and control saturation. [30][31][32] Unfortunately, there is still a challenge to estimate the settling-time owing to the relevance between controller parameters and the upper boundary of settling-time is ambiguous, which makes it difficult to select the controller parameters to meet certain system requirements.…”