Some types of bearingless switched reluctance motors (BSRMs) have been developed up to now. Their differences mainly focus on different stator-rotor tooth number and winding structures: two layers windings single layer for 12/8 or 8/6 BSRM. driving principles are just the same: current radial force regulated generate torque separately. The main difference is loading currents one separate windings. Further analysis proves that structure has more advantages, example simpler motor structure....

This article reports on the mechanism design, dimension optimization, closed-loop control, and practical application of a piezoelectrically actuated fast tool servo (FTS) for diamond turning microstructured surfaces. With mechanism, finite-element based analytical model is developed to theoretically relate working performance with its structural dimensions. Considering micro/nanocutting, dimensions are deliberately determined through evolutionarily optimizing comprehensive objective. To...

A high-performance triaxial fast tool servo (FTS) with the hybrid electromagnetic–piezoelectric actuation and parallel–serial-kinematic structure is reported. Featuring balanced uniform actuation, in this article, a novel axis-symmetric linearized reluctance actuator proposed to generate planar motion parallel, piezoactuated vertical then serially carried by within limited space. Verified finite-element analysis, two-stage design strategy developed optimally determine multiphysical system...

This article reports on the design, modeling, control, and testing of a novel compliant nanopositioning stage driven by self-developed normal-stressed electromagnetic actuator. To facilitate parameter selection for to achieve desired stroke natural frequency, an analytical model both circuit flexure mechanism is established, which then systematically verified through finite element analysis. By combining proportional—integral—differential (PID)-based main controller with system dynamics...

Spacecraft on-orbit inspection provides a prerequisite for the subsequent autonomous proximity operations. To fulfill mission, robust constrained control algorithms relative position tracking and attitude adjustment should be employed to handle nonlinear coupled dynamics, system constraints, external disturbances. In this paper, model predictive (NMPC) scheme with prescribed performance based on fixed-time neural network disturbance observer is proposed. Predefined requirements are achieved,...

This paper proposes a new, robust time-delay cooperative adaptive cruise control (CACC) approach for vehicle platooning systems with uncertain dynamics and varying communication delay. The CACC models perturbed parameters are used to describe the of system. By combining constant time headway strategy predecessor-following topology, set delay feedback controllers is designed platoon Then, computed by solving some linear matrix inequalities, which further establish (string) stability system...

An adaptive cruise control (ACC) system can reduce driver workload and improve safety by taking over the longitudinal of vehicles. Nowadays, with development range sensors V2X technology, ACC has been applied to curved conditions. Therefore, in curving car-following process, it is necessary simultaneously consider performance, ride comfort, fuel economy lateral stability vehicle. The direct yaw moment (DYC) effectively vehicle applying different forces wheels. However, various objectives...

Abstract To analyze the deformation behavior of short glass fiber-reinforced poly-ether-ether-ketone (SGFR-PEEK) under various conditions through numerical simulations, it is crucial to construct a constitutive model that can describe its stress–strain over wide range strain rates and temperatures. In this study, quasi-static compression tests were conducted on SGFR-PEEK composites with varying mass fractions, dynamic performed using Split Hopkinson Pressure Bar acquire material's...

Recent sampled-data time domain model validation techniques are applied to the inverted-pendulum experiment. An LQG controller is first designed stabilize system. Based on closed-loop finite length sampled datum, a robust control derived and tests run check validity using linear matrix inequality algorithm.

This paper reports on a dual-axial tool servo diamond turning method for the one-step fabrication of hierarchical micro-nano-structured surfaces. With respect to motion (XZ), z-axis can generate primary surface with complex shape, and x-axis is used synchronously form secondary structure via controlling residual marks. The toolpath determination algorithm developed described in detail, effect machining parameters basic feature sizes generated structures investigated through conducting...

Purpose The purpose of this paper is to investigate the pose control rigid spacecraft subject dead-zone input, unknown external disturbance and parametric uncertainty in space maneuvering mission. Design/methodology/approach First, a 6-Degree Freedom (DOF) dynamic model with disturbances derived. Second, super-twisting-like fixed-time observer (FTDO) strong robustness developed estimate lumped fixed time. Based on proposed observer, non-singular terminal sliding-mode (NFTSM) controller...

Taking advantage of the concurrent stretching and bending property corrugated flexure hinges, a sinusoidal linkage was proposed applied for construction dual-axial mechanism with structural symmetry decoupled planar motion guidance. Castigliano’s second theorem employed to derive complete compliance basic unit, matrix-based modeling then find stiffness mechanism. Using established analytical models, influence parameters on both were investigated, further verification by finite element...

Presents a model validation technique based on closed-loop, sampled, experimental data, which is applicable to open-loop unstable systems. Closed-loop probing signals are used generate the I/O information for stabilized system. Sampled measurements then taken check validity of system model. A general closed-loop test derived by applying lifting theory hybrid at sampling period. Sufficient conditions also using decimated data sets alleviate computation problem. Application an inverted...

Aimed at decreasing the tension variation during transforming process of 1+4 aluminum hot rolling mills unit in one factory Henan, we analyzed factors affecting and improved formula considering influence on forward slip value. The forming from stand 1 to 4 is simulated, structure diagrams four-stands are constructed. Due non-linear characteristics system, conventional PID controller could not meet requirement system. So proposed mixed control Cerebellar Model Articulation Controller (CMAC)...

Considering the control characteristics of variable air volume air-conditioning system, this paper presents optimized PID strategy based on bacterial foraging optimization, and applies it to optimal adjustment parameters VAV conditioning system.Compared with traditional control, new improves performance system by digital simulation in circumstances MATLAB/Simulink.

Conventional models for bearings-only tracking (BOT) are to jointly solve target motion parameters and algorithms complex. In this paper a two-step model is established BOT sequential algorithm solving parameter proposed, in which distances, velocities courses of targets solved respectively, i.e., distances geometrically by means supposed bearings, then can be obtained terms the distances. Observability analyzed sufficient necessary condition observability given observer maneuver. The...

In DC microgrids, hierarchical control that is always time-triggered, has been successfully adopted to achieve multiple objectives with decoupled design at different timescales. Recently, the event-triggered schemes have emerged primary benefit of saving communication resources when compared conventional time-triggered ones. However, general are in a continuous state, which not line actual application digital signal processors. To address this issue, sampled-data-based distributed secondary...

A piezoelectric motor driven by the first-order torsional and flexural (T/F) vibrations is designed, fabricated, tested in this study. The actuating force generated vibration of dumbbell-shaped vibrator, while elliptical motion shape adjusted with vibration. rotor, pressed onto vibrator’s lateral surface, frictionally vibrator. Here, vibration, shear modes ceramics, driving method may contribute to high torque output power. To test feasibility our proposal, first, a prototype T/F vibrator...