Research on the Impact Pressure of the Hydraulic Rolling-Cut Shear

2010 ◽  
Vol 145 ◽  
pp. 410-413 ◽  
Author(s):  
Jing Wang ◽  
He Yong Han ◽  
Qing Xue Huang ◽  
Jun Wang
Keyword(s):  
Hydraulic System ◽  
Impact Pressure ◽  
Direct Impact ◽  
Actual Situation ◽  
Work Situation ◽  
Servo Valve ◽  
Indirect Impact ◽  
Hydraulic Servo ◽  
Hydraulic Servo System ◽  
The Impact

The reasons for impact pressure are obtained by the research the hydraulic system of Hydraulic Rolling-Cut Shear. The impact pressure of hydraulic system is divided into direct impact and indirect impact. Based on analyzing the actual situation the measures should be taken to reduce the impact pressure when design hydraulic system. The suitable length of pipeline can improve the performance of the hydraulic system because the length is important for the impact pressure. The accumulator can absorb impact pressure and improve the work situation of servo valve. Therefore, the suitable accumulators should be set in the hydraulic system. The study provides theory basis for the pipe design of large hydraulic servo system.

scholarly journals Assessing the Impact of Deliberative Democratic Initiatives at the Local Level: A Framework for Analysis

2018 ◽  
Vol 51 (5) ◽  
pp. 749-769 ◽  
Author(s):  
Ank Michels ◽  
Harmen Binnema
Keyword(s):  
The Netherlands ◽  
Policy Making ◽  
Local Community ◽  
Local Politics ◽  
Public Policies ◽  
Local Level ◽  
Direct Impact ◽  
Indirect Impact ◽  
The Impact

Although deliberative reforms have been proposed to strengthen democracy, little is known about their impact on politics, public policies, and society. This article develops a framework to systematically assess this impact, differentiating between direct and indirect forms of impact. We apply this framework to two cases of deliberative citizens’ summits in the Netherlands. Our analysis reveals that these summits have a limited direct impact on local politics and policy making, but a relatively strong indirect impact on the local community. The article also discusses some conditions that mediate the impact of the forum.

scholarly journals Analysis of the jet pipe electro-hydraulic servo valve with finite element methods

2018 ◽  
Vol 153 ◽  
pp. 06013
Author(s):  
Zhao Kaiyu ◽  
Wu Qingxun ◽  
Zhang Lijian ◽  
Yuan Zhaohui ◽  
Yang jiaqiang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Step Response ◽  
Element Analysis ◽  
Servo Valve ◽  
Analysis Process ◽  
Characteristics Analysis ◽  
Hydraulic Servo ◽  
Mathematical Relationships ◽  
The Impact

The dynamic characteristics analysis about the jet pipe electro-hydraulic servo valve based on experience and mathematical derivation was difficult and not so precise. So we have analysed the armature feedback components, torque motor and jet pipe receiver in electrohydraulic servo valve by sophisticated finite element analysis tools respectively and have got physical meaning data on these parts. Then the data were fitted by Matlab and the mathematical relationships among them were calculated. We have done the dynamic multi-physical fields’ Simulink co-simulation using above mathematical relationship, and have got the input-output relationship of the overall valve, the frequency response and step response. This work can show the actual working condition accurately. At the same time, we have considered the materials and the impact of the critical design dimensions in the finite element analysis process. It provides some new ideas to the overall design of jet pipe electro-hydraulic servo valve.

Displacement Control of Hydraulic Pump with Servo System for Energy Saving

2011 ◽  
Vol 148-149 ◽  
pp. 942-946 ◽  
Author(s):  
Jin Сhun Song ◽  
Guan Gan Ren ◽  
Yu Jie Ren ◽  
Bai Sen Zhang
Keyword(s):  
Mathematical Modeling ◽  
Energy Saving ◽  
Pressure Loss ◽  
Hydraulic System ◽  
Actual Situation ◽  
Displacement Control ◽  
Hydraulic Pump ◽  
Servo Valve ◽  
Governing System ◽  
Large Pressure

The worst problem we are facing in the hydraulic system is the serious loss of energy, due to bad matching between the power components and the actuators and the large pressure loss when oil flowing though the various hydraulic elements, especially in speed governing system. However, Servo pump which is introduced in this paper can cover the problems mentioned above finely. The most difficult thing is its mathematical modeling, in the paper, it is established according to the actual situation. Here, the modeling between servo valve and cylinder, between cylinder and pump are established respectively, then these are connected by geometry relationship, finally ,the whole modeling is completed.

Suppression of Micro Stick-Slip Vibrations in Hydraulic Servo-System

1998 ◽  
Vol 122 (2) ◽  
pp. 249-256 ◽  
Author(s):  
Toshiyuki Hayase ◽  
Satoru Hayashi ◽  
Kazunori Kojima ◽  
Ikuro Iimura
Keyword(s):  
Feedback Linearization ◽  
Servo System ◽  
Hydraulic Cylinder ◽  
Feedback Gain ◽  
Stick Slip ◽  
Servo Valve ◽  
Wide Range ◽  
Order Of Magnitude ◽  
Hydraulic Servo ◽  
Hydraulic Servo System

This paper deals with suppression of two kinds of micro stick-slip vibrations occurring in a typical computer-controlled hydraulic servo-system. The relevant system consists of a single-rod hydraulic cylinder, an electrohydraulic servo-valve and a personal computer. The discontinuous control signal from a D/A converter causes a stick-slip vibration of micron order of magnitude over a wide range of the feedback gain. Increasing the feedback gain results in the other stick-slip vibration of nearly ten times larger amplitude due to the nonlinear pressure-flow characteristic of the servo-valve. The numerical simulation revealed the latter micro stick-slip vibration could be efficiently suppressed with the feedback linearization technique to compensate the nonlinearity of the servo-valve, while the former one reduced by improving the resolution of the D/A converter. Validities of both the methods were also confirmed with experiment. [S0022-0434(00)00102-7]

Ngalap Berkah Qur’an: Dampak Membaca Al-Qur’an Bagi Para Pembacanya

2018 ◽  
Vol 5 (2) ◽  
pp. 91-106
Author(s):  
Eva Nugraha
Keyword(s):  
Everyday Life ◽  
Qualitative Approach ◽  
Direct Impact ◽  
Peace Of Mind ◽  
Data Coding ◽  
Indirect Impact ◽  
The Impact

This paper examines the question of how the impact of reading the Qur'an in everyday life? The author uses the word impact as diction to show that the Qur'an as dhikr mubārak / Kitābun mubārak, has blessings. This research is a development of one of the sub-chapters of the author's dissertation draft regarding the blessings of the Qur'an. The data used are the results of interviews and observations on a number of readers and memorizers of the Qur'an. Data were analyzed by using qualitative approach, starting from data coding, description of coding result and classification. The author uses the framework of the exegete's on mubārak/ Quranic blessing which are the definition, terms and benefits of the blessings of the Qur'an. As for the conclusion of this paper is: that the impact of reading the Qur'an will depend on the intensity and pattern of reader interaction to the Qur'an. There are two effects that readers get from their interactions in reading the Qur'an. first direct impact, which corresponds to the motive and purpose of reading, such as peace of mind. Second: the indirect impact, such as ease in living life.

Decoupling Compensation Using in the Hydraulic-Servo System of Mould

2012 ◽  
Vol 184-185 ◽  
pp. 1526-1532 ◽  
Author(s):  
Liang Li ◽  
Xiong Zhou ◽  
Xiao Gang Deng
Keyword(s):  
Hydraulic System ◽  
Servo System ◽  
Mutual Interference ◽  
Two Dimensional ◽  
The Real ◽  
Compensation Control ◽  
Hydraulic Servo ◽  
System Output ◽  
Hydraulic Servo System ◽  
And Control

The hydraulic-servo system of mould is a typical two-dimensional hydraulic-servo system, what stored among pass way was handed in and uniting interfering with between every pass way of the system. Because of the connection of the load system, output and control of every pass way influencing each other, cause the coupling of load, influence the system, even cause the systematic instability. This text apply on coupling and decoupling principle, mutual interference problem of many pass way that exists in the hydraulic system of mould, is studied by decoupling compensation control. Through the theory pushing over, we bring forward the decoupling compensation method, which can solve mutual interference problem. Have verified the feasibility of this method in the real artificial experiment too, and can solve mutual interference problem in the hydraulic and systematic of mould effectively.

Analysis of Injection Molding Machine's Energy Consumption Based on Two Different Hydraulic Circuits

2013 ◽  
Vol 365-366 ◽  
pp. 220-223
Author(s):  
Guan Nan Xi ◽  
Miao Sun ◽  
Jun Gao ◽  
Yi Dan Zhou
Keyword(s):  
Energy Consumption ◽  
Injection Molding ◽  
Hydraulic System ◽  
Servo System ◽  
High Energy ◽  
Molding Machine ◽  
The World ◽  
Hydraulic Servo ◽  
Hydraulic Servo System ◽  
High Energy Consumption

As is known to all, domestic productions of injection molding machine are huge and exported to all over the world. However, the production can only occupy the low-end markets because of its high-energy consumption and low molding precision. Besides the problems of mechanical components, the main reason led to such results lie in the its too backward hydraulic system. By comparing domestic traditional hydraulic system with foreign new hydraulic servo system, this paper focuses on the analysis of the characteristics of foreign new hydraulic servo system and verify the results by experiments based on the upper two different hydraulic system. Through this paper hopefully can it provide some practical directs to the design of domestic new hydraulic system.

The Design of Comprehensive CAT Test Rig for Electro-Hydraulic Servo Valve

2013 ◽  
Vol 389 ◽  
pp. 394-397
Author(s):  
Shuai Feng ◽  
An Bin Xu ◽  
Dong Li
Keyword(s):  
System Design ◽  
Software Design ◽  
Virtual Instrument ◽  
Hydraulic System ◽  
Test Rig ◽  
Servo Valve ◽  
Hydraulic Servo ◽  
Instrument Technology ◽  
Hydraulic System Design

By comparing the limitation of traditional test rig for electro-hydraulic servo valve and the advantages of CAT test rig for electro-hydraulic servo valve, this paper demonstrates an overall CAT test rig design including hydraulic system design and test software design. This work applies virtual instrument technology based on LabVIEW and adopts OPC standard to realize real-time communication between computer and PLC. Eventually as a case study, a test example of a well-functional servo valve is presented to show the validity and accuracy of the test rig.

Application of EKF for an Electro-Hydraulic Servo System Using Model-Based Approach

2013 ◽  
Vol 385-386 ◽  
pp. 609-613
Author(s):  
Lin Zheng ◽  
Liang Liang Wu ◽  
Xue Ming Gu ◽  
Z. Shi ◽  
Andrew Ball
Keyword(s):  
Mathematical Model ◽  
Kalman Filter ◽  
Fault Detection ◽  
Hydraulic System ◽  
Detection Method ◽  
Method Comparison ◽  
Estimation Accuracy ◽  
Model Based ◽  
Hydraulic Servo ◽  
Hydraulic Servo System

This paper works on extended Kalman filter (EKF) for model-based fault detection of an electro-hydraulic system to deal with stochastic behaviour during control. A mathematical model of an electro-hydraulic system is developed. Some faults are introduced to evaluate the EKF fault detection method. Comparison of the EKF estimation accuracy and a linearised model-based accuracy shows the advantage of the EKF.

scholarly journals Does Covid 19 Pandemic Have a Direct Impact on the Level of Trust and Commitment toward Hospitals as Health Service Providers in Yogyakarta?

2021 ◽  
Vol 2 (3) ◽  
pp. 162-170
Author(s):  
Yuni Heriyanti
Keyword(s):  
Service Providers ◽  
Research Result ◽  
Public Health Care ◽  
Consumer Trust ◽  
Survey Method ◽  
Direct Impact ◽  
Health Service Providers ◽  
Indirect Impact ◽  
Consumer Commitment ◽  
The Impact

The purpose of this study was to examine the direct and indirect effects of the pandemic on consumer trust and consumer commitment towards public health care in Yogyakarta during the pandemic. The research method in this study was the survey method with path analysis tools. Based on the research result it can be concluded that the direct impact of the Covid pandemic (X) on trust (Y1) is 0.205 (unstandardized) and 0.187 (standardized), the direct impact of trust (Y1) on the Y2 commitment is 0.602 (unstandardized) and 0.63 (standardized). Based on the t-test on the Sobel formula, the t value (3.251) > t table (1.663), means that there is an indirect impact between variable X (pandemic) on Y2 (commitment) through Y1 (trust). The impact of the Covid pandemic indirectly affects consumer commitment through the variable of trust with a combined direct and indirect impact of 1,099.

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