Nonlinear Synchronous Control for H-Type Gantry Stage Used in Electric VehiclesManufacturing

The H-type gantry stage (HGS) is widely used in electric vehicle manufacturing and other fields. However, resulting from the existence of mechanical coupling, the synchronous control problem of HGS always troubles many engineers. Most synchronization schemes were either engaged in improving each motor’s tracking performance or committed to pure motion synchronization only. However, tracking and synchronous performance are interconnected, because of the mechanical coupling. In this paper, a rigid assumed system model of HGS, concerning the effects of mid-beam rotary inertia, mid-beam stiffness, and end-effector movement, is presented. Based on the proposed model, an adaptive robust synchronous control based on a rigid assumed model (ARSCR) is proposed to improve both synchronous and tracking performance of the HGS. From the Lyapunov analysis, the proposed ARSCR can achieve the convergence of synchronous error and tracking error, simultaneously. An HGS driven by dual linear motors is built and used to perform the experimental verification. The experimental results indicate the effectiveness of the proposed method.

Differential Movement Synchronous Tracking Control Strategy of Double-Shaking Table System Loading with Specimen

Multisupport, multidimension, and nonuniform excitation seismic experiments have new requirements for shaking table array system in synchronous tracking control. Therefore, this article proposed a novel synchronous tracking strategy, differential movement synchronous tracking control (DMSTC) strategy, for double-shaking table system while taking the interaction between shaking tables and specimen into consideration. DMSTC Simulink model of the double-shaking table with specimen was established and simulations were conducted in various conditions. The results demonstrate the viability of the proposed DMSTC in that the frequency bandwidth of the double-shaking tables is expanded from 3.27 Hz to 64.57 Hz, the maximum value of differential movement synchronous error is decreased from 1.682 mm to 0.482 mm, and the maximum tracking errors of the two shaking tables decrease from 1.138 mm to 0.044 mm and from 1.030 mm to 0.497 mm, respectively.

Research on Frame Synchronization of OFDM System

Synchronization is very important for any digital transmission technology. It can almost be said the core of any control system, so the synchronization algorithm is precisely the premise to transmit data correctly. This point is especially important for OFDM system. Synchronous error is the biggest shortcoming of OFDM system, the performance of the receiver is closely related to if we can get the accurate synchronization signal.

Research on Synchronization Control of Dual-Motor Driving for Large Rotary Car Dumper

Car dumper is an important material transport equipment which has characteristics such as large structure, heavy duty, low frequency operation, stop-and-go and recurrent excursion of machine barycenter. This paper researched implementation of synchronization control. A fuzzy controller is added between two channels of dual drive subsystem. Based on coordinated control principle and achieving the goal of difference minimum of corresponding state of two subsystem, a fuzzy correction control program using in-phase error non-uniform common feedback is adopted to make the output of two synchronous subsystem consistent basically, which increase response speed of system to synchronous error, reduce synchronous error of dual drive subsystems effectively, ensure the consistency of car dumper dual drive, solve the recurrent mechanical failure caused by inconsistency of dual drive and enhance the steady reliable operation of car dumpers. The synchronization control strategy presented by this paper provides favorable guarantee for synchronization precision of multi subsystem in large rotary equipments and at the same time explores new ideas for other synchronization control systems.

Energy Saving for Gantry-Type Feed Drives by Synchronous and Contouring Control

Because feed drives are widely used day and night in industrial applications such as machine tools and coordinated measuring machines all over the world, not only high-speed and high-precision control but also consumed energy saving is required. This paper presents a controller design to reduce consumed energy for gantry-type feed drives that consist of two linear actuators placed in parallel and one linear actuator placed perpendicular to the two parallel actuators. The proposed design is based on synchronous and contouring controllers. The synchronous controller has been studied for reducing synchronous error between two parallel actuators that causes significant mechanical damage, and the contouring controller has been developed for improving contouring performance, especially in machining applications. Experimental results demonstrate the effectiveness of the proposed controller, which reduces consumed electrical energy by about 10%.

Synchronized Control of Dual Linear Motors Position Servo System Based on Multi-Axes Motion Control Card

This paper introduces a position synchronized control strategy to deal with the synchronous error caused by the external disturbance in dual linear motors servo system. In order to achieve satisfactory results, a new control scheme combing feedforward control, feedback control and cross-coupled control is proposed and makes progress in decreasing the synchronous error which was shown by the experiment.