scholarly journals A Review on Self-Recovery Regulation (SR) Technique for Unbalance Vibration of High-End Equipment

2020 ◽  
Vol 33 (1) ◽  
Author(s):  
Xin Pan ◽  
Jiaqiao Lu ◽  
Jiaji Huo ◽  
Jinji Gao ◽  
Haiqi Wu
Keyword(s):  
Machine Tools ◽  
Engineering Application ◽  
Intelligent Manufacturing ◽  
The Self ◽  
Basic Principles ◽  
Intelligent Maintenance ◽  
Mass Unbalance ◽  
Regulation Method ◽  
Important Direction ◽  
Aero Engines

AbstractThe high-end equipment represented by high-end machine tools and aero-engines is the core component of the national intelligent manufacturing plan, and the mass unbalance is the main reason for its excessive vibration, that seriously impacts the operation efficiency and running life of the equipment. In order to change the traditional way that the fault of equipment can only be repaired by human, the self-recovery mechanism of human and animal are given to the equipment in this paper, which forms the self-recovery regulation (SR) system for unbalance vibration of high-end equipment. The system can online generate the self-recovery force to restrain the unbalance vibration of the equipment in operation, which is an important direction for the development of the equipment to the advanced intelligent stage. Based on the basic principles of SR technique, the typical engineering application cases of this technique in the field of aeroengine and high-end machine tools are introduced, and four related studies promoting the development of this technique are summarized and analyzed in turn. It includes feature extraction, imbalance location, regulation method and balancing actuator. Self-recovery Regulation (SR) Technique is an important way to realize intelligent manufacturing and intelligent maintenance. Relevant research can lay a technical foundation for the development of high-end equipment with self-health function.

Das intelligente Instandhaltungssystem/The intelligent maintenance system - An approach for the self-learning structuring of maintenance libraries

2017 ◽  
Vol 107 (07-08) ◽  
pp. 530-535
Author(s):  
T. Miebach ◽  
M. Schmidt ◽  
P. Prof. Nyhuis
Keyword(s):  
Collaborative Research ◽  
The Self ◽  
Research Centre ◽  
Maintenance System ◽  
Intelligent Maintenance ◽  
Product Engineering ◽  
The Right ◽  
Self Learning ◽  
Intelligent Maintenance System

Der Fachbeitrag stellt eine Methode vor, mit der sich Bibliotheken von Instandhaltungsmaßnahmen selbstlernend gestalten lassen. Die „Intelligenz“ solcher Systeme bietet mehrfachen Nutzen, einerseits durch die Auswahl der passenden Instandhaltungsmethode zum richtigen Zeitpunkt, andererseits durch die damit verbundene Erhöhung des kompletten Abnutzungsvorrates. Die Ergebnisse sind im Sonderforschungsbereich 653 „Gentelligente Bauteile im Lebenszyklus – Nutzung vererbbarer, bauteilinhärenter Informationen in der Produktionstechnik“ entstanden.   This article describes a method to design a self-learning maintenance library. The benefit derived from the intelligence of those systems refers to the right choice of maintenance measures at the right time and the enhancement of the whole wear margin. The results are part of the Collaborative Research Centre 653: Gentelligent components in their lifecycle – Utilization of inheritable component information in product engineering.

scholarly journals DEVELOPMENT OF QUICK RETURN MECHANISM FOR EXPERIMENTATION USING SOLIDWORKS

2020 ◽  
Vol 26 (3) ◽  
pp. 19-27
Author(s):  
NURUDEEN OLATUNDE ADEKUNLE ◽  
KOLAWOLE ADESOLA OLADEJO ◽  
ISMAILA OLASUNKANMI SALAMI ◽  
ADEWALE OREOLUWA ALABI
Keyword(s):  
Angular Velocity ◽  
Machine Tools ◽  
Constant Angular Velocity ◽  
Experimental Results ◽  
Stroke Length ◽  
Basic Principles ◽  
Return Stroke ◽  
Kinematic Simulation ◽  
Machine Operation ◽  
Significant Difference

Quick Return Mechanisms (QRMs) are one of the essential accessories used in machine tools which involve reciprocating cutting action with a quick return stroke and a constant angular velocity of driving crank. The aim of this work was to simulate, design and construct a prototype of a QRM that can be used for demonstration and instrumentation. The QRM was simulated using Solidworks and a prototype was developed from the simulated results. The experiment was conducted using the prototype. The kinematic simulation of the Solidworks model was compared with the kinematics of motion of the prototype. The result showed that the Percentage Stroke Length error was 0.36%. It was observed that, there was no significant difference in the simulated and experimental results, hence, the prototype can be used for demonstration and experimentation to assist students in understanding basic principles of the machine operation.

scholarly journals Modelling, measurement and optimization of self-noise of hydrophone with preamplifier

2019 ◽  
Vol 283 ◽  
pp. 05004
Author(s):  
Yi Chen ◽  
Lisheng Zhou ◽  
Xiyang Guo ◽  
Tao He ◽  
Jun Zhang
Keyword(s):  
Input Resistance ◽  
The Self ◽  
Noise Model ◽  
Density Level ◽  
Noise Sources ◽  
Basic Principles ◽  
Low Frequencies ◽  
Leading Role ◽  
Noise Optimization ◽  
Measurement Results

Self-noise is an important specification of hydrophone with preamplifier. This paper presents the modelling, measurement and optimization of the self-noise of hydrophone with preamplifier. Through analyzing various noise sources of hydrophone and its preamplifier, an effective self-noise model of hydrophone with preamplifier was established, and the self-noise was mainly affected by the hydrophone quality factor, preamplifier noise and thermal noise of preamplifier input resistance. In order to measure the self-noise of hydrophone with preamplifier, a measurement system was constructed and used for measuring the self-noise of a RHSA30 hydrophone which manufactured by Hangzhou Applied Acoustics Research Institute (HAARI) and has a typical sensitivity of -173 dB. After optimization of the self-noise of RHSA30 hydrophone, the measured equivalent noise pressure spectral density level was close to 30 dB at the frequency of 1000 Hz. The measurement results proved that the preamplifier current noise which mainly coming from the Operational Amplifier played a leading role at low frequencies of hydrophone with preamplifier. And some basic principles for self-noise optimization of hydrophone with preamplifier were given at the end.

Study on Organic Microcapsule Based Self-Healing Cementitious Composite

2011 ◽  
Vol 239-242 ◽  
pp. 764-767 ◽  
Author(s):  
Ming Zhang ◽  
Feng Xing ◽  
Kai Yong Shi ◽  
Xue Xiao Du
Keyword(s):  
Engineering Application ◽  
The Self ◽  
Self Healing ◽  
Cementitious Composite ◽  
Good Industry ◽  
Cracked Concrete ◽  
The Subject

Base on engineering application need, the subject introduce microcapsule that contains adhesive into cementituous composite for realizing the self-healing characteristics of cracked concrete. The technique has good industry feasibility, process operability, and reproducibility of self-healing characteristic. It is can resolve partial problems that other current self-healing methods are facing.

scholarly journals Vertical Distribution of Nearshore Flow Velocity

2016 ◽  
Vol 23 (s1) ◽  
pp. 104-108
Author(s):  
Li Chunhui ◽  
Fu Xiaoyan ◽  
Li Ruijie ◽  
Dai Lu ◽  
Chen Peng
Keyword(s):  
Vertical Distribution ◽  
Flow Velocity ◽  
Engineering Application ◽  
Maximum Velocity ◽  
Mean Velocity ◽  
Basic Principles ◽  
Measured Flow ◽  
The Mean ◽  
New Formula ◽  
Distribution Of Flow

Abstract In this paper, a new exponential formed vertical distribution of nearshore flow velocity is constructed, which is simpler in form and more suitable for engineering application. The physical meaning of the new formula is more specific than that of Soulsby. Compared with those logarithmic formed ones, the new one does not need the maximum velocity and only needs the mean velocity in vertical, which gives it better engineering practicability. Apply the new formula to Jiangsu coastal area and compare the results with that of Soulsby whose results show the new formula agrees better with the measured flow velocity, which reasonably reflects the basic principles of vertical distribution of flow velocity.

Research of Electric Differential Control for Motor-Wheel-Drive Electric Vehicle

2013 ◽  
Vol 310 ◽  
pp. 540-543
Author(s):  
Xiang Fu ◽  
Yong He ◽  
Di Xu
Keyword(s):  
Control System ◽  
Electric Vehicle ◽  
Self Regulation ◽  
Wheel Speed ◽  
The Self ◽  
Dynamics Modeling ◽  
Wheel Drive ◽  
Regulation Method ◽  
Simulation Results ◽  
Differential Control

The Electric Differential Control for Motor-Wheel-Drive Electric Vehicle is discussed. And then the self-regulation method to realize the electric differential by controlling the torque of the motor and freeing the speed of the wheels has been proposed. Firstly, tire-road dynamics modeling has been established, Control system of Motor-Wheel-Drive Electric Vehicle has been designed. Secondly, simulation platform of Motor-Wheel-Drive Electric Vehicle has been established. Lastly, simulation for electric differential control of Motor-Wheel-Drive Electric Vehicle has been validated. The simulation results show that the self-regulation method by controlling the torque of the motor and freeing the speed of the wheels is effective. Each wheel speed and the corresponding wheel speed automatically keep coordination; it can realize the self-regulation differential, no wheel slipping or sliding phenomenon.

Index Plate Special Milling Machine PLC Control System Design

2014 ◽  
Vol 971-973 ◽  
pp. 540-543
Author(s):  
Xiang Zhou Deng ◽  
Tao Xue
Keyword(s):  
Control System ◽  
Machine Tools ◽  
Control System Design ◽  
Milling Machine ◽  
Basic Principles ◽  
Control Center ◽  
Plc Control ◽  
Hydraulic Cylinders ◽  
Automation Control ◽  
Hydraulic Valves

This article describes a technique for the use of advanced PLC indexing plate milling machine tools for transformation of the program ; and describes the basic principles of PLC , PLC engineering steps. The system uses Mitsubishi FX2N series PLC as the control center , the entire system using PLC controlled hydraulic valves to achieve the grinding head , under the table up, down , hydraulic cylinders translocation, hydraulic cylinders reset function , enabling Rotary milling machine dedicated automation control system.

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