Abstract Angle domain common image gathers (ADCIGs), commonly regarded as important prestacked gathers, provide the information required for velocity model construction and phase amplitude needed subsurface structures in oil/gas exploration. Based on constant-density acoustic-wave equation assumption, ADCIGs generated from reverse time migration ignore fact that density varies with location. Co...

The paper is devoted to the local classification of generic control-affine systems on an n-dimensional manifold with scalar input for any n ≥ 4 or with two inputs for n = 4 and n = 5, up to state-feedback transformations, preserving the affine structure (in C∞ category for n = 4 and Cω category for n ≥ 5). First using the Poincare series of moduli numbers we introduce the intrinsic numbers of f...

In this paper, the general formulation of periodically time-varying state-feedback controllers with memory is considered for the first time. New analysis and synthesis conditions for robust stability are proposed. The flexibility of these new results allows the user to freely add degrees-of-freedom to the control law which appears to effectively reduce the conservatism of the synthesis conditio...

Mainstream traffic flow control (MTFC) enabled via variable speed limits (VSLs) has been investigated in previous studies, utilizing various control strategies. In this paper a new feedback control strategy is proposed for MTFC enabled via VSLs, considering multiple bottleneck locations. Results are evaluated using a validated macroscopic model. The feedback concept is robust and can be immedia...

A novel Shape Memory Alloy (SMA) actuator consisting of several thin NiTi bers woven in a counter rotating helical pattern around supporting disks is rst described. This structure accomplishes a highly eecient transformation between force and displacement overcoming the main mechanical drawback of shape memory alloys, that being limited strain. Time domain open loop experiments were then conduc...

In the nD case, a relationship between control viewed as system interconnection and trajectory control can be obtained in terms of the notion of extended interconnection. Such an interconnection corresponds to the introduction of latent variables in the descriptions of the relevant behaviors. In this paper we define different types of extended interconnections and characterize the corresponding...

This paper examines event-triggered broadcasting of state information in distributed networked systems. Event-triggering has the agent broadcast its state information when its local “error” signal exceeds a given threshold. We present a decentralized approach for determining event-triggering thresholds for nonlinear subsystems with the assumption that each agent only has access to its local sta...

A novel back-stepping adaptive control strategy is proposed to direct torque control (DTC) of surface permanent magnet synchronous motor (SPMSM) in order to solve some problems existed in conventional DTC, such as high flux , torque and current ripple, variable switching frequency, and acoustic noises. PI speed regulator and two hysteresis regulators in the conventional DTC system are substitut...

Recently, information gain has been proposed as a candidate intrinsic motivation for lifelong learning agents that may not always have a specific task. In the InfoMax control framework, reinforcement learning is used to find a control policy for a POMDP in which movement and sensing actions are selected to reduce Shannon entropy as quickly as possible. In this study, we implement InfoMax contro...

In large-scale air conditioning water systems, variable flow (VWF) control strategies are frequently utilized to conserve energy. This paper presents a differential pressure (DP) set-point strategy for VWF systems based on the pipeline characteristic curve. bifurcates most unfavorable loop into two segments: equivalent main pipe (EMP) and terminal branch (MUTBP). Initially, impedance of EMP is ...