This paper investigates the problem of impact-angle-constrained guidance law design against maneuvering target with large initial heading error. The is first formulated in range domain by leveraging a relative reference frame. Based on optimal control theory and error dynamics, proposed derived analytically without using any linearization assumptions. approximate closed-form solution exact numerical are presented to analyze characteristics physical meaning law. key feature lies its simple...

Electrocardiogram (ECG) is essential for the clinical diagnosis of arrhythmias and other heart diseases, but deep learning methods based on ECG often face limitations due to need high-quality annotations. Although previous self-supervised (eSSL) have made significant progress in representation from unannotated data, they typically treat signals as ordinary time-series segmenting using fixed-size fixed-step time windows, which ignore form rhythm characteristics latent semantic relationships...

This article presents a new 3-D nonlinear optimal guidance law to control the impact angle in maneuvering target interception. approach formulates optimization problem relative frame that enables derivation of solution without using any linearization assumptions. The key advantage proposed lies its exact nature, and hence, tolerable initial heading error is much larger than linear laws. connection with existing laws analyzed results reveal unifies previous solutions. working principle...

Low Impact Development (LID) is one of the sustainable approaches to urban stormwater management in areas with rapid urbanization. Although LID has been shown have a positive effect flood reduction, hydrological balance regulation under variety rainfall events not fully understood. In this study, we assessed efficiency at two residential–commercial mixed sites Korea investigate main function terms diverse characteristics. Storm Water Management Model (SWMM) was constructed simulate process...

This paper investigates the three-dimensional (3-D) homing guidance problem of intercepting an evasive target with maneuverability comparable to missile. The is first reformulated in relative frame help geometrically derive necessary condition interception without terminal advantage 3-D space. A two-stage optimal law then analytically derived bounded acceleration satisfy aforementioned condition. Theoretical analysis performed interpret working principle and physical meaning proposed law....

The aim of this paper is to develop some novel operational laws for a hesitant fuzzy linguistic term set (HFLTS)-based on the improved supplementary regulation and Archimedean t-norms s-norms. HFLTSs can reserve fidelity original information commendably, it brings new conception research measures HFLTS. As hot key topic fusion, s-norms based aggregation operators are proposed aggregate HFLTSs. Some essential properties together with their special cases such discussed in detail. entropy...

A failure of the pneumatic ABS (anti-lock braking system) weakens performance commercial vehicles. It affects driving safety There are four typical modes that include: pilot inlet solenoid valve and exhaust pressure regulator, series dual-chamber brake valve, relay valve. In order to study rule vehicles under ABS, co-simulation model vehicle was established based on AMESim Simulink softwares. The gas path subsystem were built AMESim. controller Simulink/Stateflow. data transmitted between...

In this study, the surface modification on graphene oxide (GO) was performed using octadecylamine (ODA). Furthermore, polybutylene terephthalate/GO (PBT/GO) composites were prepared to elucidate role of GO mechanical performance, thermal stability and crystallization behavior. Results Fourier transform infrared spectra (FT-IR), Raman spectrum, thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) transmission electron microscope (TEM) revealed that ODA successfully grafted...

This article investigates the cooperative guidance problem for multiple missiles to intercept a maneuvering target. We propose an optimal encirclement guidance, which is known be suitable improving observability and limiting evasive probability of By formulating optimization in reference frame, solution can obtained without any linearization explicit cooperation ensured regulating relative line-of-sight angles achieve encirclement. The main advantage proposed approach lies its nonlinear...

Consistency and the priority vector are two important issues in preference relations. As one of relations, multiplicative trapezoidal fuzzy relation (MTFPR) is an effective form vague imprecise information when decision maker (DM) express his/her opinions by comparing a lternatives or criteria with each other group making (GDM). Therefore, it meaningful to discuss consistency method for deriving MTFPRs. In this paper, we define MTFPRs investigate necessary sufficient conditions consistent...

This paper investigates the impact-angle-control guidance problem for varying-speed flight vehicles with constrained acceleration. A learning-based bias proportional navigation (L-BPN) law is proposed to achieve impact-angle-constrained impact by constructing a deep neural network (DNN) nonlinear mapping between angle and term. During process of dataset establishment, state variables evaluated sensitivity analysis minimize quantity training data. approach also effectively accelerates sample...

Aiming at the problem that guided projectile is difficult to implement in-flight alignment of roll angle with low-cost gyroscope, this paper proposes an scheme based on pitch velocity vector caused by gravity. The relationship between rotation angular measured gyroscope and time established. In order avoid influence uncalibrated MEMS accuracy, error modeled included in equation. Then estimated compensated adaptive Adam algorithm. Consequently, accuracy can be effectively improved....

This paper proposes a novel sliding mode guidance law with finite-time convergent theory against maneuvering targets impact angle constraint and autopilot lag. To mitigate the external disturbance stemming from target maneuver, an adaptive observer(ASMDO) is used to estimate maneuver precisely. During process of design, fixed-time control during reaching stage guarantee system state convergence time upper bound relative flight missile which can ensure that stable less than avoid large miss...

This paper investigates the problem of three dimensional (3-D) guidance law design against maneuvering target with large initial heading error. We first formulate in range domain by leveraging a relative inertial frame 3-D space. Based on optimal control theory, proposed is derived analytically without using any linearization assumptions. The exact closed-form solution presented to analyze characteristics and physical meaning law. key feature lies its simple implementation nonlinear nature....