Amplitude-frequency characteristics during the volume-pulsatile packing process

2021 ◽  
pp. 1-29
Author(s):  
Sen Qin ◽  
Huan-huan Zhang ◽  
Hao-wei Jiang ◽  
Wen-hua Xu ◽  
Jin-ping Qu
Keyword(s):  
Control System ◽  
Hydraulic System ◽  
Response Speed ◽  
Frequency Characteristics ◽  
Servo Control ◽  
Displacement Amplitude ◽  
System Structure ◽  
Equivalent Model ◽  
Pressure Amplitude ◽  
Packing Process

Abstract To obtain high-quality plastic products, an industrial volume-pulsatile injection molding (VPIM) machine is developed to achieve high screw displacement amplitude. However, it is difficult for engineers to optimize vibration parameters and improve equipment due to lack of a comprehensive understanding of the coupling correlation between amplitude and frequency, which seriously hinders the development of VPIM technology and machine. To address the challenge, this paper investigates the amplitude-frequency characteristics during the volume-pulsatile packing process. According to the working principle of machine, the dynamics model of injection screw is established and equivalent to a mass-spring-damper system. Based on the dynamics equivalent model, we deduce the forced vibration response of screw displacement, and the vibration responses of screw displacement and oil pressure under hydraulic system. Meanwhile, an overall system structure diagram including servo control is proposed and numerically solved. Experimental and theoretical results reveal the effects of material properties, machine components, and control system on the amplitude-frequency characteristics during the volume-pulsatile packing process. The inertial delay of hydraulic system is primarily responsible for the reductions in oil pressure amplitude and screw displacement amplitude, which subverts the previous perception. The response speed of servo control system to pressure should be improved to enhance oil pressure amplitude and screw displacement amplitude. This paper enriches the basic theories of polymer vibration processing and points out the direction of equipment improvement.

Design and Analysis of the Low-Speed Hydraulic Control System of 3.15MN Forging Press

2013 ◽  
Vol 690-693 ◽  
pp. 2210-2217
Author(s):  
Yi Bo Li ◽  
Ming Hui Huang ◽  
Qing Pan ◽  
Min Chen
Keyword(s):  
Control System ◽  
Hydraulic System ◽  
Hydraulic Press ◽  
System Structure ◽  
Hydraulic Control ◽  
Low Speed ◽  
Hydraulic Theory ◽  
Forging Press ◽  
The Mathematical Model ◽  
Hydraulic Control System

A low speed hydraulic control system applying to 3.15MN forging press isdesigned for isothermal forging processes. Based on the hydraulic theory andthe system structure, both the mathematical model and the simulation model ofthe hydraulic press are established with its features discussed. PID controlmethod is adopted and genetic algorithm is used to automatically tune theparameters of the controller to deal with nonlinearity and time-variant of thecontrolled plant. Co-simulation of the control system and hydraulic system isestablished to verify the feasibility of the design. It is proved by anisothermal forging of a turbine disc that the system has good performances andcan achieve an ultra speed control in the end.

Research on Electro-Hydraulic Force Servo Control System Based on Specialist PID Control Strategy

2017 ◽  
Vol 14 (1) ◽  
pp. 341-346
Author(s):  
Li Jianying ◽  
Wang Yanwei ◽  
Zhao Zhongqiang ◽  
Wang Xiaojing ◽  
Han Guihua
Keyword(s):  
Control System ◽  
Control Theory ◽  
Pid Control ◽  
Response Speed ◽  
Mathematic Model ◽  
Servo Control ◽  
Servo Control System ◽  
Hydraulic Force ◽  
Differential Element ◽  
Gain Characteristic

There is flexibility load in the electro-hydraulic force servo control system researched in this paper, and it results in that there is a lower oscillation frequency secondary differential element in radical of the transmit function of the system. The flexibility load and the secondary differential element seriously impact the bandwidth of the system and let the bandwidth rise difficultly, and that the flexibility load and the secondary differential element make the system oscillation even instability easily. Aiming at this special characteristic and the smaller system gain characteristic of the electrohydraulic force servo control system, the specialist PID control theory applied to the electro-hydraulic force servo control system which is the typical nonlinear system. The mathematic model of the system is built and the simulation and the experiment research is finished in the work of this paper, at the same time, the author of this paper compares the control result of the new controller designed according to the specialist PID control theory with the control result of traditional PID controller. The simulation and the experiment results indicate that the new controller designed according to the specialist PID control theory not only enlarge the bandwidth of system, improve the accuracy, reduce control error, but also accelerate the response speed obviously, increase the dynamic property of the system.

scholarly journals Analysis of Power Matching on Energy Savings of a Pneumatic Rotary Actuator Servo-Control System

2020 ◽  
Vol 33 (1) ◽  
Author(s):  
Yeming Zhang ◽  
Hongwei Yue ◽  
Ke Li ◽  
Maolin Cai
Keyword(s):  
Control System ◽  
Energy Savings ◽  
Servo Control ◽  
Power Matching ◽  
Servo Control System ◽  
Rotary Actuator

Developing and Research on Motion Controller Based on CPLD and MCU

2012 ◽  
Vol 490-495 ◽  
pp. 456-459
Author(s):  
Jun Han ◽  
Rui Li Chang
Keyword(s):  
Control System ◽  
High Speed ◽  
Servo Control ◽  
Numerical Control ◽  
Control Technology ◽  
Numerical Control System ◽  
Motion Controller ◽  
Research Focus ◽  
Open Cnc ◽  
Computer Numerical Control System

Open Computer Numerical Control system (Open CNC) based on PC and the Windows operating system has been a major developing direction and a research focus of the current numerical control technology. At present, there have been all kinds of the Open CNC systems with high-speed and precision servo control boards, but they are too expensive. Therefore, developing an economical and practical motion controller is great significant for middle and small numerical control system

scholarly journals Performance Improvement of Servo Control System Driven by Novel PMSM-DTC Based On Fixed Sector Division Criterion

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2154 ◽  
Author(s):  
Dazhi Wang ◽  
Tianqing Yuan ◽  
Xingyu Wang ◽  
Xinghua Wang ◽  
Yongliang Ni
Keyword(s):  
Control System ◽  
Performance Improvement ◽  
Error Compensation ◽  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
Torque Control ◽  
Servo Control ◽  
Flux Linkage ◽  
Servo Control System ◽  
Stator Flux

In order to improve the performance of the servo control system driven by a permanent magnet synchronous motor (PMSM) under novel direct torque control (NDTC), which, utilizing composite active vectors, fixed sector division criterion, is proposed in this paper. The precondition of the accurate compensations of torque and flux errors is that the sector where the stator flux linkage is located can be determined accurately. Consequently, the adaptive sector division criterion is adopted in NDTC. However, the computation burden is inevitably increased with the using of the adaptive part. On the other hand, the main errors can be compensated through SV-DTC (DTC-utilizing single active vector), while another active vector applied in NDTC can only supply the auxiliary error compensation. The relationships of the two active vectors’ characteristics in NDTC are analyzed in this paper based on the active factor. Furthermore, the fixed sector division criterion is proposed for NDTC (FS-NDTC), which can classify the complexity of the control system. Additionally, the switching table for the selections of the two active vectors is designed. The effectiveness of the proposed FS-NDTC is verified through the experimental results on a 100-W PMSM drive system.

A Hydraulic Control System Design for Change-Wheel Garage of Light Rail Based on PLC

2012 ◽  
Vol 233 ◽  
pp. 76-79
Author(s):  
Yong Gang Yang ◽  
Jun Sun ◽  
Meng Tao Yang
Keyword(s):  
Control System ◽  
System Design ◽  
Servo Control ◽  
Light Rail ◽  
Control System Design ◽  
Hydraulic Control ◽  
Plc Control ◽  
Servo Control System ◽  
Hydraulic Servo ◽  
Hydraulic Control System

This paper introduces the hydraulic control system design for the change-wheel garage of Chongqing light rails through analysis of three-stage cylinder synchronization circuit for lifting bodies, and optimizing the design of the slewing mechanism with respect to the hydraulic servo control system of digital cylinder. The results improved the smoothness in the process of changing wheel lifting and the rotary accuracy of the rotary mechanism. Design on the PLC control system of the system is also included as part of this paper.

Coal-Conveying Control System for the Pressure of Coal Waste Heat Power Generation Based on PLC

2013 ◽  
Vol 336-338 ◽  
pp. 681-685
Author(s):  
Li Jun Zhao ◽  
Ying Feng Chen
Keyword(s):  
Control System ◽  
Waste Heat ◽  
Computer Control ◽  
System Structure ◽  
Utilization Rate ◽  
Coal Waste ◽  
Stable Operation ◽  
Efficient Operation ◽  
Actual Operation ◽  
One Year

This paper constructs a coal-conveying control system based on programmable logic controller (PLC), which is applied to the residual heat and pressure integrated energy-saving technological transformation projects, and realizes the performance of security, reliable and efficient operation. This control system consists of the PLC control system, computer control system and industrial television monitoring system. After more than one year of actual operation shows that the system structure is reasonable, reliable operation, at the same time, reduce labor intensity, improve the utilization rate of equipment, the stable operation also provides a practical reference for other similar projects.

The Research on Substation Computer Monitoring System

2014 ◽  
Vol 1049-1050 ◽  
pp. 1196-1199
Author(s):  
Yu Ming Ma ◽  
Lin Liu
Keyword(s):  
Control System ◽  
Monitoring System ◽  
Supervisory Control ◽  
System Structure ◽  
Management Model ◽  
Monitoring Technology ◽  
Computer Monitoring ◽  
Supervisory Control System ◽  
Operation And Management

In this paper, the substation computer supervisory control system structure, content, features and characteristics were described. In recent years, substation monitoring technology has been developed rapidly, and has been widely used. However, due to the promotion of our country is in its infancy, technology is not mature, the new operation and management model is being explored, and thus in the operation also exposed some problems.

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