Chuang Liu – författare

Spacecraft Attitude Control: A Linear Matrix Inequality Approach solves problemsfor spacecraft attitude control systems using convex optimization and, specifi cally,through a linear matrix inequality (LMI) approach. High-precision pointing and improvedrobustness in the face of external disturbances and other uncertainties are requirementsfor the current generation of spacecraft. This book presents an LMI approach to spacecraftattitude control and shows that all uncertainties in the maneuvering process can besolved numerically. It explains how a model-like state space can be developed through amathematical presentation of attitude control systems, allowing the controller in question tobe applied universally. The authors describe a wide variety of novel and robust controllers,applicable both to spacecraft attitude control and easily extendable to second-ordersystems. Spacecraft Attitude Control provides its readers with an accessible introductionto spacecraft attitude control and robust systems, giving an extensive survey of currentresearch and helping researchers improve robust control performance.

Considers the control requirements of modern spacecraft Presents rigid and flexible spacecraft control systems with inherent uncertainties mathematically, leading to a model-like state space Develops a variety of novel and robust controllers directly applicable to spacecraft control as well as extendable to other second-order systems Includes a systematic survey of recent research in spacecraft attitude control

Impact Mechanics of Ceramic Armor: Dwell and Interface Defeat provides a thorough overview of the impact dynamics of projectiles and targets, crack propagation, and damage evolution of ceramic armor during interface defeat and penetration. The book provides experimental techniques and results of ceramic armor subjected to projectile damage, covers the mechanics of damage of ceramic armor under impact load, and analyzes the failure processes alongside corresponding theoretical models. Constitutive models and material parameters between projectile and target are explained, techniques for optimum ceramic armor design are outlined, and applications of interface defeat in the field of light armor are provided.

Explains the impact dynamics of projectiles and targets, crack propagation, and damage evolution of ceramic armorSummarizes experimental techniques and discusses the results of ceramic armor subjected to projectile damageDiscusses the mechanisms of damage of ceramic armor under impact load and interface defeat, observing the failure process and providing corresponding theoretical modelsProvides insights into how to design ceramic composite armor that will withstand certain projectiles

Spacecraft Electromagnetic Docking and Separation solves problems for spacecraft electromagnetic docking and separation control system using different control methods: instead of the widely used proportional-integral-derivative controller or PID control. The book focuses on presenting a variety of control strategies tailored for spacecraft electromagnetic docking and separation, accompanied by stability proofs that integrate Lyapunov stability theory with sliding mode theory, LMIs-based theorems, model predictive control theories, reinforcement study theories and other frameworks, so the reader can understand how to handle different kinds of disturbances and perturbations in actual orbiting spacecraft. The book also provides a review of magnetic field, magnetic field force model (both the near-field model and the far-field model), useful lemmas and dynamic modelling methods of spacecraft relative motion, which can serve as first stage analysis for further research and are especially important in the initial design phase of a spacecraft electromagnetic docking and separation control systemA wide variety of novel robust and non-fragile controllers are discussed and against a backdrop of considering various uncertainties, e.g. advanced sliding mode control, observer-based control, model predictive control, reinforcement study-based control and impedance control; these are not only applicable to spacecraft electromagnetic docking and separation control, but also easily extendable to a more general class of second-order system with uncertainties and perturbationsDiscusses the mathematical representation of spacecraft electromagnetic docking and separation control systems with uncertainties embedded in them leads to a model-like continuous and discrete state-space form which makes the developed controller universalDiscusses the role, in spacecraft electromagnetic docking and separation, of how the control systems in achieving high-precision position and better robustness to external disturbances (plus various uncertainties and gain perturbations) can be achieved

This book deals with models and model-building in classical and quantum physics; it relies on logic and the philosophy of science as well as on modern mathematics. The reader will also find vistas into the history of ideas. The philosophical analysis is based on the separation of syntax and semantics, which is at the root of Kolmogorov's theory of probability; recursive functions and algorithmic complexity are used to discuss entropy and randomness. Basic concepts are discussed, together with concrete physical models for phase transitions, scaling, renormalization semigroups, and the irreversible approach to equilibrium. The book is intended for mathematicians, physicists and philosophers of science, both researchers and graduate students.

This book addresses several of the foundational problems in thermophysics, i. e. thermodynamics and statistical mechanics. It is an interdisciplinary work in that it examines the philosophical underpinning of scientific models and theories; it also refines the analysis of the problems at hand and delineates the place occupied by various scientific models in a generalized philosophical landscape. Hence, our philosophical - or theoretical - inquiry focuses sharply on the concept of models; and our empirical - or laboratory - evidence is sought in the model-building activities of scientists who have tried to confront the epistemological problems arising in the thermophysical sciences. Primarily for researchers and students in physics, philosophy of science, and mathematics, our book aims at informing the readers - with all the in­ dispensable technical details made readily available - about the nature of the foundational problems, how these problems are approached with the help of various mathematical models, and what the philosophical implications of such models and approaches involve. Some familiarity with elementary ther­ mophysics and/or with introductory-level philosophy of science may help, but neither is a prerequisite. The logical and mathematical background re­ quired for the book are introduced in the Appendices. Upon using the Subject Index, the readers may easily locate the concepts and theorems needed for understanding various parts of the book. The Citation Index lists the authors of the contributions we discuss in detail.

This volume contains the contributed papers of invitees to SEMS 2012 who have also given talks at the conference. The invitees are experts in philosophy of science and technology from Asia (besides China), Australia, Europe, Latin America, North America, as well as from within China.The papers in this volume represent the latest work of each researcher in his or her expertise; and as a result, they give a good representation of the cutting-edge researches in diverse areas in different parts of the world.