Integrated Multi-model Optimization of Voice Coil Motor for High-Frequency Free-piston Stirling Generator

2021 ◽  
Author(s):  
Qiyi Wu ◽  
Bowen Xu ◽  
Lin Qiu ◽  
Xing Liu ◽  
Jien Ma ◽  
...  
Keyword(s):  
High Frequency ◽  
Voice Coil Motor ◽  
Model Optimization ◽  
Free Piston

scholarly journals Composite Motion Design Procedure for Vibration Assisted Small-Hole EDM Using One Voice Coil Motor

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Jing Cui ◽  
Zhongyi Chu
Keyword(s):  
High Frequency ◽  
Phase Error ◽  
Electrical Discharge Machine ◽  
Design Procedure ◽  
Voice Coil Motor ◽  
Small Hole ◽  
Feedback Parameter ◽  
High Frequency Response ◽  
Debris Accumulation ◽  
Motion Design

To address the problem of debris accumulation in small-hole electrical discharge machine (EDM) and simplify the design of the spindle head, the paper proposes a novel composite motion design procedure integrated high frequency vibration and large stroke feed using one voice coil motor (VCM). Particularly, for the purposes of high servo accuracy and high frequency response of the composite motion, an improved zero-phase-error tracking controller (ZPETC) algorithm decoupled with the feedback controller is developed for the process control, in which the feedback parameter adjustment is very simple to reduce the computation complexity. At last, the proposed procedure is validated by the experimental study of the established VCM positioning table; the results verify the efficiency of the proposed method.

Direct Amplitude Control for Voice Coil Motor on High Frequency Reciprocating Rig

2020 ◽  
Vol 25 (3) ◽  
pp. 1299-1309
Author(s):  
Ruotong Wang ◽  
Xin Yin ◽  
Qibing Wang ◽  
Lin Jiang
Keyword(s):  
High Frequency ◽  
Voice Coil Motor ◽  
Amplitude Control

Research on One-Dimensional High Frequency Linear Motion Platform

2015 ◽  
Vol 734 ◽  
pp. 332-335
Author(s):  
Fei Wang ◽  
Rong Rong Wu ◽  
Li Qiang Wang ◽  
Si Yuan Wu
Keyword(s):  
High Frequency ◽  
High Speed ◽  
Voice Coil Motor ◽  
Design Solution ◽  
Mechanical Transmission ◽  
Linear Motion ◽  
Motion Platform ◽  
One Dimensional ◽  
The One ◽  
And Control

Precision motion system is driven directly by high frequency linear motion platform, eliminating the adverse effects brought by mechanical transmission, and greatly improving the rapid reaction capability and the control accuracy of feedback system. The linear motion platform is widely used in various types of high-speed, precision machining equipment. In the paper, the one-dimensional linear motion platform is described, and design solution of mechanical part and control system is also introduced, including working principle and structure of voice coil motor, control methods of grating sensors, circuit of grating sensor, drive and control circuit. Displacement control, speed control and output force control of the one-dimensional linear motion control platform can be achieved. So the one-dimensional linear motion platform can be applied in the movement device in high-precision and high-speed.

scholarly journals Parametric Simulations on Leakage and Performance of a Miniature Free-Piston Generator (MFPG)

2021 ◽  
Vol 11 (16) ◽  
pp. 7742
Author(s):  
Saifei Zhang ◽  
Chunhua Zhang ◽  
Yong Liu ◽  
Wei Wu ◽  
Han Wu ◽  
...  
Keyword(s):  
Combustion Engine ◽  
Electric Energy ◽  
Voice Coil Motor ◽  
Electrical Equipment ◽  
Energy Conversion Efficiency ◽  
Small Scale ◽  
Portable Devices ◽  
Free Piston ◽  
Heat Engines ◽  
And Performance

The miniaturization of electrical equipment and popularization of portable devices is an appealing motivation for the development of small-scale heat engines. However, the in-cylinder charge leaks severely as the engine dimension shrinks. The free-piston engine on a small scale provides better sealing than other miniature heat engines. Therefore, a miniature free-piston generator (MFPG) with a single-piston internal combustion engine (ICE) and a voice coil motor (VCM) was proposed in this work. A dynamic model with special attention on the heat transfer and leakage was established accordingly, upon which parametric studies of leakage and its effects on the performance of the MFPG system were performed. Four key parameters, including scavenging pressure, ignition position, combustion duration and piston mass, were considered in the model. The results showed that the mass leakage during the compression decreases with the rise of the motoring current. The indicated thermal efficiency can be improved by boosting scavenging pressure and increase motoring current. The critical ignition position is 2 mm before the top dead center. When ignition occurs later than that, the MFPG system is incapable of outputting power. The chemical to electric energy conversion efficiency is about 5.13 %, with an output power of 10~13 W and power density around 4.7~5.7 W/cc.

Development of a Direct-Drive Servo Valve With High-Frequency Voice Coil Motor and Advanced Digital Controller

2014 ◽  
Vol 19 (3) ◽  
pp. 932-942 ◽  
Author(s):  
Shuai Wu ◽  
Zongxia Jiao ◽  
Liang Yan ◽  
Rui Zhang ◽  
Juntao Yu ◽  
...  
Keyword(s):  
High Frequency ◽  
Voice Coil Motor ◽  
Digital Controller ◽  
Direct Drive ◽  
Servo Valve

scholarly journals Few-Shot Charge Prediction with Data Augmentation and Feature Augmentation

2021 ◽  
Vol 11 (22) ◽  
pp. 10811
Author(s):  
Peipeng Wang ◽  
Xiuguo Zhang ◽  
Zhiying Cao
Keyword(s):  
High Frequency ◽  
Data Augmentation ◽  
Feature Fusion ◽  
Low Frequency ◽  
Good Effect ◽  
Model Optimization ◽  
Convolutional Network ◽  
Proposed Model ◽  
Virtual Samples ◽  
Feature Augmentation

The task of charge prediction is to predict the charge based on the fact description. Existing methods have a good effect on the prediction of high-frequency charges, but the prediction of low-frequency charges is still a challenge. Moreover, there exist some confusing charges that have relatively similar fact descriptions, which can be easily misjudged. Therefore, we propose a model with data augmentation and feature augmentation for few-shot charge prediction. Specifically, the model takes the text description as the input and uses the Mixup method to generate virtual samples for data augmentation. Then, the charge information heterogeneous graph is introduced, and a novel graph convolutional network is designed to extract distinguishability features for feature augmentation. A feature fusion network is used to effectively integrate the charge graph knowledge into the fact to learn semantic-enhanced fact representation. Finally, the semantic-enhanced fact representation is used to predict the charge. In addition, based on the distribution of each charge, a category prior loss function is designed to increase the contribution of low-frequency charges to the model optimization. The experimental results on real-work datasets prove the effectiveness and robustness of the proposed model.

A New Type Fatigue Machine Design with High Frequency Large Stroke

2014 ◽  
Vol 496-500 ◽  
pp. 1522-1525 ◽  
Author(s):  
Peng Xu ◽  
Hai Ying Liu ◽  
Yu Tao Men ◽  
Bao Shan Xu ◽  
Jun Lu ◽  
...  
Keyword(s):  
High Frequency ◽  
Low Frequency ◽  
Voice Coil Motor ◽  
Measuring System ◽  
Metallic Materials ◽  
Force Curve ◽  
Compressive Test ◽  
Mechanical Parts ◽  
New Type ◽  
Low Efficiency

The traditional fatigue machine using stepping motor as driving device has the disadvantages of low efficiency, low frequency and producing heat terribly. This paper presents the development of a new type fatigue machine using voice coil motor which has the advantage of high frequency, high accuracy and easy to control as driving device in order to make up for these deficiencies of the traditional machine. The maximum frequency of fatigue machine can reach 200Hz, and the maximum stroke will reach 30mm. The machine can test the properties of anti-fatigue crack of metal and non-metallic materials and the fatigue lives of mechanical parts. It also can provide the force curve changing with time under different frequencies when carrying on tensile and compressive test on sample, which can greatly improve the accuracy and stability of measuring system

scholarly journals Flatness-Based High Frequency Control of a Hydraulic Actuator

2011 ◽  
Vol 134 (2) ◽  
Author(s):  
Florian Kock ◽  
Cornelius Ferrari
Keyword(s):  
High Frequency ◽  
Control Algorithm ◽  
Large Scale ◽  
Feedforward Control ◽  
Frequency Control ◽  
Hydraulic Actuator ◽  
Free Piston ◽  
High Frequencies ◽  
Control Concept ◽  
Feedforward Controller

This paper presents the design and implementation of a nonlinear feedforward control algorithm for a hydraulic actuator driven by a multistage servo valve. Combined with a conventional feedback control algorithm, high frequencies can be achieved even for large-scale strokes. In addition to the desired trajectory, the feedforward controller accepts the predicted dynamic load on the hydraulic actuator as an input. The performance of the control concept as well as the advantages of the load input are verified in simulations and experiments. Being exemplarily used for realizing a crankshaft-less test stand for free piston engines, the control algorithm is potentially suitable for further applications using hydraulic actuators in high frequency domain.

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