scholarly journals MANDALAY’S HYDRAULIC SYSTEM –A HISTORIOGRAPHICAL APPROACH TO THE REGIONAL SPATIAL STRUCTURE

2022 ◽  
Author(s):  
Koji Yamada
Keyword(s):  
Spatial Structure ◽  
Hydraulic System ◽  
System A

A study of function-based diagnosis strategy and testability analysis for a system

2011 ◽  
Vol 226 (1) ◽  
pp. 273-282 ◽  
Author(s):  
Y-T Tsai ◽  
Y-Y Hsu
Keyword(s):  
Hydraulic System ◽  
Block Diagram ◽  
Fault Isolation ◽  
Functional Block Diagram ◽  
Diagnostic Ability ◽  
System A ◽  
Study Results ◽  
System Maintenance ◽  
System Information ◽  
Test Points

A good diagnostic policy can not only shorten the detection time of faults but also improve the effectiveness of system maintenance. This paper presents a function-based diagnosis strategy that provides a helpful methodology for fault identification. The diagnosis trees of the systems are constructed based on a functional block diagram consisting of function elements (FEs) and test points (TPs). The correlations between the FEs and the TPs are first analysed according to system information flows. Two weighted indexes for fault detection and fault isolation are defined to determine the priority of these TPs in testing. Several parameters related to diagnostic ability are also introduced to provide an evaluated approach for system testability. The diagnostic steps and costs between traditional sequential testing and the function-based diagnosing are compared. The study results may be useful in planning diagnosis actions and testability design for a system. A hydraulic system is used as an example in order to depict the proposed methods.

Property, Sales, Income Taxes, and Urban Spatial Structure

1980 ◽  
Vol 12 (11) ◽  
pp. 1287-1296 ◽  
Author(s):  
G I Thrall
Keyword(s):  
Theoretical Model ◽  
Numerical Analysis ◽  
Local Government ◽  
Spatial Structure ◽  
Hybrid Approach ◽  
Income Taxes ◽  
Land Values ◽  
Urban Spatial Structure ◽  
System A ◽  
Property Sales

A hybrid approach combining theoretical and numerical strategies is utilized in determining the effect that government activity has upon urban land values and structure. A theoretical model of the interaction of households and a local government is used to structure the salient relationships. A numerical analysis is subsequently performed on the analytic system to qualitatively evaluate both the implications and the reasonableness of the system. A hybrid investigation lends credence to abstract analyses and supports the use of theoretical constructs in the development of empirical formulations.

scholarly journals Design and Analysis of Ejection Pin System for 1500T Press

2019 ◽  
pp. 181-187
Author(s):  
V R Sawant ◽  
K S Ugale ◽  
R D Aher ◽  
S S Gulve ◽  
R S Ostwal
Keyword(s):  
Production Rate ◽  
Hydraulic System ◽  
Hydraulic Press ◽  
Manufacturing Industries ◽  
Ansys Software ◽  
System A ◽  
Stamping Process ◽  
Time Required ◽  
Different Parts

In manufacturing industries hydraulic press are used to produce different parts required for automobile and other industries. To produce different parts by stamping process dies and position patterns of cushion pins are changed. Depending upon the shape of part to be produced respective die and the position pattern of cushion pins in the bolster plate is selected. Before the production starts position of this cushion pins is tasted to secure the safety of die and parts to be produced. But the testing consumes more time and effects production rate. In this project the time required for the testing is reduced by automating the cushion pin ejection system. A separate hydraulic system is used for the required automation in order to reduce the idle of the hydraulic press. AUTOCAD and ANSYS software are used for design and analysis of the automation.

scholarly journals Modelling & Position Control for Electro-Hydraulic System

2019 ◽  
Vol 8 (4) ◽  
pp. 3841-3845 ◽  
Keyword(s):  
Control System ◽  
Hydraulic System ◽  
Position Control ◽  
Industrial Applications ◽  
Hydraulic Systems ◽  
System A ◽  
Complex Process ◽  
Highly Nonlinear ◽  
Back Stepping Control ◽  
And Control

Electro-hydraulic systems (EHS) are widely used in industrial applications due to the high-power density and accuracy. However, EHS are highly nonlinear which makes its modelling and control aspects a complex process. In this paper, we present the modelling and position control for an electro-hydraulic system (EHS). The mathematical modelling is carried out considering the non-linearities like friction, discharge coefficient and load mass present in the system. A back-stepping control scheme is developed for maintaining the accuracy in the position control. The closed-loop stability of the proposed control system is analyzed with Lyapunov’s theory. The performance of the control system under the effect of bounded external uncertainties is validated with simulation study. The study indicates that the proposed controller gives an effective motion control in presence of the system uncertainties.

Four-port hydraulic transformer with inlet and outlet equal flow and its flow characteristics

2021 ◽  
pp. 095440622110316
Author(s):  
Chu Zhang ◽  
Lianquan Zhou ◽  
Xiaonan Bo ◽  
Weiwei Qu ◽  
Panpan Zang
Keyword(s):  
Theoretical Analysis ◽  
Flow Rate ◽  
Hydraulic System ◽  
Measurement Data ◽  
Flow Characteristics ◽  
Remarkable Feature ◽  
Flow Rates ◽  
Instantaneous Flow ◽  
Hydraulic Transformer ◽  
System A

Without changing the original valve control hydraulic system, a kind of hydraulic transformer, called four-port hydraulic transformer (FHT), is proposed to recover the energy loss caused by system throttling. The remarkable feature of FHT is that the flow rate at inlet and outlet ports are equal. This means that FHT can be connected into the load circuit of hydraulic system to recovery energy without refreshing flow rate. This paper investigates the flow characteristics of FHT, including instantaneous flow rates, average flow rates and flow pulsations in each port. The relationships between the structure of port plate and the flow characteristics are given. The variation rule of number of plungers connected to four ports is shown, and the relationship between the variation and the flow pulsation is revealed. The simulation results show that the flow rates and displacements of symmetrical ports are same, and the instantaneous flow rate of symmetrical ports has the same rule. The results also show the frequent changes of the number of plungers connected with each port lead to more flow jump points in instantaneous curves, and the jump point is the basic cause of its loud noise. The test shows that the flow rates of measurement data of the experiment are very close to the theoretical analysis, proved the theoretical analysis of flow characteristics for FHT are appropriate and reasonable, which has a certain reference for the development and energy-saving application for FHT.

Motion Synchronization for Multi-Cylinder Electro-Hydraulic System

2001 ◽  
Author(s):  
Hong Sun ◽  
George T.-C. Chiu
Keyword(s):  
Robust Control ◽  
Hydraulic System ◽  
Control Algorithm ◽  
Control Technique ◽  
Pressure Force ◽  
Outer Loop ◽  
System A ◽  
Synchronization Problem ◽  
Loop Motion ◽  
Motion Synchronization

Abstract This paper presents a nonlinear control algorithm to address the motion synchronization problem for a multi-cylinder electro-hydraulic (EH) system. A 2-step design approach is applied such that it utilized linear MIMO robust control technique to design an outer loop motion synchronization controller. A nonlinear SISO perturbation observer based pressure/force controller is designed for each of the lift cylinder as the inner loop controller to handle the nonlinearities associated with the EH actuators. Experimental results on a 4-cylinder system are presented to verify the effectiveness of the proposed approach.

Effect of Feedback Control on the Bifurcation Stability of a Nonlinear Servohydraulic System: An Experimental Investigation

2003 ◽  
Author(s):  
Amit Shukla ◽  
David F. Thompson ◽  
Srinivas Kowta
Keyword(s):  
Experimental Investigation ◽  
Feedback Control ◽  
Hydraulic System ◽  
Control Structure ◽  
Linear Feedback ◽  
Hydraulic Systems ◽  
Order Model ◽  
Stability Behavior ◽  
Bifurcation Stability ◽  
System A

Servo-hydraulic systems are commonly used for motion and force control. In this work, an experimental investigation is performed to study the effect of feedback control on the bifurcation stability of a nonlinear servo-hydraulic system. A low-order model of the experimental test stand is developed, validated and analyzed. It is shown that the use of appropriate feedback control structure can improve the bifurcation stability of a nonlinear servo-hydraulic system. Parametric space investigation is conducted to study the bifurcation stability behavior of the system and stability boundaries are developed to demonstrate the effect of linear feedback on the nonlinear systems.

Design of Hydraulic System for Electrohydraulic Servo Valve Test Bed

2013 ◽  
Vol 288 ◽  
pp. 84-87
Author(s):  
Dong Hai Su ◽  
Xiao Dong Tang
Keyword(s):  
Hydraulic System ◽  
High Efficiency ◽  
Performance Testing ◽  
Test System ◽  
Test Bed ◽  
Servo Valve ◽  
System A ◽  
Automated Test System ◽  
Static Performance ◽  
High Degree

According to the needs of the electrohydraulic servo valve dynamic and static performance testing, designed an automated test system for the test of the static characteristics and dynamic characteristics test combinations together. Its advantage includes a stable system, a high degree of automation, simple operation, and high efficiency, full-featured.

Promoting Sustainability through Water Hydraulic Technology – The Effect of Water Hydraulic in Industrial Scissor Lift

2013 ◽  
Vol 315 ◽  
pp. 488-492 ◽  
Author(s):  
Ahmad Anas Yusof ◽  
Shafizal Mat ◽  
Abdul Talib Din
Keyword(s):  
Molecular Structure ◽  
Hydraulic System ◽  
Maintenance Cost ◽  
Test Rig ◽  
Transfer Energy ◽  
Hydraulic Oil ◽  
Effect Of Water ◽  
Low Viscosity ◽  
System A ◽  
Water Hydraulic

Sustainability concern has brought the idea of exploring the possibility of using water as the hydraulic medium to transfer energy. The abundant resource of water, and its characteristic involving hygiene, safety and low maintenance cost provides a fascinating perspective of choosing water over hydraulic oil, due to concerns over oil disposal, contamination, costly maintenance and flammability. However, in contrast, its low boiling temperature, low viscosity, and simple molecular structure could pose danger to the operation of the hydraulic system. In order to identify these limitations, an experimental study is carried out to explore the effect of water hydraulic system. A test rig of scissor lift is fabricated and put into test by replacing the hydraulic oil with reverse osmosis water. It is found that the water hydraulic scissor lift managed to lift up to 400 kg of load, with workable water temperature of 41.4°C.

The Role of Residential Development in the Spatial Structure of Cities of Russia and Bulgaria

2018 ◽  
Vol 931 ◽  
pp. 827-833 ◽  
Author(s):  
Aleksandr A. Salov ◽  
Igor V. Fedoseev ◽  
Marina N. Yudenko
Keyword(s):  
Spatial Structure ◽  
Residential Development ◽  
Financial Independence ◽  
The Sustainable Development ◽  
Maintenance Mechanism ◽  
System A ◽  
Governance Models ◽  
The City ◽  
House Building

This article considers the city as a complex social system, a highly developed urbanized area, a place for the development of the economy, politics and the performance of economic functions. The authors suggest a system of elements that contribute to the sustainable development of the city and which includes monitoring the degree of political and public participation and commitments, governance models and mechanisms, processes and their improvement, policies, plans, strategic programs, governance mechanisms, a maintenance mechanism for the financial independence of cities and institutions. Considering that, the spatial structure of the city occupies a significant place in residential development, a comparative analysis of the state of the construction of cities in Russia and Bulgaria is given. A conclusion was drawn about various approaches to the development of industrial housing construction in Russia and European countries. The experience of Russian factories in the modernization of house building was considered.

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