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.

Numerical Simulation on the Temperature Characteristics of Indirect Air Cooling System

2015 ◽  
Vol 741 ◽  
pp. 536-540
Author(s):  
Xiao Zhi Qiu ◽  
Yan Ming Zhao ◽  
Bao Hua Huang ◽  
Wei Xu
Keyword(s):  
Numerical Simulation ◽  
Wind Speed ◽  
Cooling System ◽  
System Change ◽  
Temperature Characteristic ◽  
Air Cooling ◽  
Ansys Software ◽  
System A ◽  
Air Cooling System ◽  
Simulation Results

Based on the analysis of indirect air cooling system, a numerical simulation model of indirect air cooling system was constructed by ANSYS software. According to the different wind speed condition, the temperature characteristic of indirect air cooling system was analyzed. The simulation results show that with the increase of wind speed, the ventilation and heat release of the indirect air cooling system change greatly. It provides a theoretical basis for the design of the wind-proof device of indirect air cooling system.

Fault diagnosis of hydraulic system in large forging hydraulic press

Measurement ◽  
2014 ◽  
Vol 49 ◽  
pp. 390-396 ◽  
Author(s):  
Xian-bin Fu ◽  
Bin Liu ◽  
Yu-cun Zhang ◽  
Li-na Lian
Keyword(s):  
Fault Diagnosis ◽  
Hydraulic System ◽  
Hydraulic Press ◽  
Large Forging

Study on Track Control to the Multiple Degrees of Freedom Mechanical Arm of the Sampling Machine for Coal at Railway Carriage

2012 ◽  
Vol 542-543 ◽  
pp. 963-967
Author(s):  
Zhi Xue Tong ◽  
Li Chen Shi ◽  
Jing Yang ◽  
Li Gang Zhang
Keyword(s):  
Motion Control ◽  
Intelligent Control ◽  
Hydraulic System ◽  
Degrees Of Freedom ◽  
Optimization Method ◽  
Hydraulic Press ◽  
Servo Control ◽  
Multiple Degrees Of Freedom ◽  
Servo Control System ◽  
Set Up

The multiple degrees of freedom mechanical arm of sampling machine for coal at railway carriage is driven by hydraulic press. It is a kind of joint. During working, the sampling head not only keeps in its poses, but also moves along a straight path. The mechanical arm’s motion is resolved into three independent motion systems, foundation rotation, straight motion of 3 degrees of freedom kinematics chain, and servo control system of the sampling head. A group of motion equations is set up. According to the reversion theory and optimization method, the motion control model is built up in order to reappear the motion track. The method is efficient to solve the motion control problem. And the result of driving curve is more suitable for the hydraulic system. This method is useful for motion intelligent control of different kinds of joint manipulator.

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.

Paper 8: Gas Chromatography for the Analysis of Exhaust Gases

1965 ◽  
Vol 180 (7) ◽  
pp. 95-100
Author(s):  
P. G. Jeffery ◽  
P. J. Kipping
Keyword(s):  
Gas Flow ◽  
Wheatstone Bridge ◽  
Building Blocks ◽  
Gas Analysis ◽  
Oxides Of Nitrogen ◽  
Vehicle Exhaust ◽  
Exhaust Gases ◽  
System A ◽  
Linear Amplifier ◽  
Time Required

The traditional methods for the analysis of vehicle exhaust gases have never been entirely satisfactory. The recent development of gas analysis by gas chromatographic methods offers considerable improvement in accuracy, precision, and also in time required. Difficulties still arise for certain constituents, notably sulphur dioxide and oxides of nitrogen, for which chemical methods of analysis are still preferred. The chromatographic analysis of the hydrocarbon fraction and the remaining inorganic fraction of exhaust gases, where this is required, is now a routine operation, calling for neither expert chromatographic knowledge, nor exceptional skill in manipulation. A typical gas Chromatograph may be considered as comprising a number of simple building blocks, including a carrier gas flow system, a sample inlet mechanism, a chromatographic material for component resolution, a detector for those components of interest, and a display mechanism. Some form of electrical control is required; this may amount to little more than a Wheatstone bridge network, or may be a high quality linear amplifier and associated voltage-decade supply for the more sophisticated ionization detectors. Each of these building units is considered in detail, and the errors that can arise in the course of making an analysis of an exhaust gas are noted. The possibility of gross errors arising from defective equipment is also considered.

Experiment Study on Performances of Servo Pump Used in Hydraulic Press Machine

2012 ◽  
Vol 516-517 ◽  
pp. 892-895 ◽  
Author(s):  
Jun Gao ◽  
Guo Yi Yan ◽  
Gen Yun Peng ◽  
Guan Nan Xi
Keyword(s):  
Energy Efficiency ◽  
Control System ◽  
Working Conditions ◽  
Hydraulic System ◽  
Test Bench ◽  
Hydraulic Press ◽  
Experiment Study ◽  
Two Systems ◽  
Positive Meaning ◽  
Valve Control

As we known, the energy efficiency of pump-control system is higher than valve-control system. So, using pump-control system to replace valve-control system has a positive meaning to improve the energy efficiency in hydraulic press machine. In order to research the performance of servo pump used in hydraulic press machines, the present study is conducted. First, a test bench for comparison of pump-control and valve-control system is established. In this test bench, the pump of former valve-control system and the servo pump are settled. These two pumps are switched by solenoid to supply oil for the hydraulic system. Then, host PC, target PC, I/O board and other hard-wares are connected. Soft-wares and the corresponding driver board are applied to collect data. In order to test the performances of the pressure, velocity and displacement under the condition of the valve-control system and pump-control system, the two systems are tested with the same working conditions. The performance of repeatability and energy efficiency are also obtained. The results show that it’s feasible to apply servo pump to hydraulic press machine. And under the pump-control condition, the velocity and pressure performance of press machine is more stable.

scholarly journals The Fumigation of Ships with Liston's Cyanide Fumigator

1923 ◽  
Vol 21 (3) ◽  
pp. 199-219
Author(s):  
W. Glen Liston ◽  
S. N. Goré
Keyword(s):  
Artificial Ventilation ◽  
Point Of View ◽  
High Concentrations ◽  
Time Required ◽  
Different Parts ◽  
At Will

(1) These experiments prove that the fumigator is safer to use than the dumping fixture, because high concentrations of the poison gas are avoided, so that dangerous pockets are not developed.(2) The poison gas is more evenly distributed over the different parts of the section of the ship under treatment.(3) High concentrations, however, can be developed^ at will in any part which requires special attention.(4) The maximum concentrations of the poison gas were obtained in every part of the section in a shorter time, when the fumigator was used, than when the dumping fixture was employed.(5) The artificial ventilation caused by the fan, which is capable of blowing into the section 500 to 1000 cubic feet of fresh air per minute, according to the speed of the motor, materially assists the rapid clearing of the poison gas from the ship, after it has accomplished its work. It is thus possible to complete the fumigation and ventilation of a ship in 3 hours using the cyanide fumigator, while more than 4 hours are required for the dumping fixture.(6) Even more important is the fact that smaller quantities of cyanide can be used with greater efficiency in the fumigator, than larger quantities, with less efficiency in the dumping fixture.(7) The general conclusion is arrived at, that, from the point of view of efficiency, safety and economy, the fumigator is superior to the dumping fixture. Creel has shown that, in respect to the time required for completing the fumigation, and in respect to the thoroughness of the process, both in killing rats and insects, the dumping fixture is superior to the Clayton gas machine. It follows, therefore, that the cyanide fumigator is very much superior in these respects to the Clayton gas machine.

Pressure Modeling and Analysis of a Synchronized Hydraulic Press Brake With Variable-Speed Pump

2015 ◽  
Author(s):  
Paulo Leonel Teixeira ◽  
Waldir Vianna ◽  
Ricardo D. Penteado ◽  
Petter Krus ◽  
Victor Juliano De Negri
Keyword(s):  
Hydraulic Press ◽  
Energetic Efficiency ◽  
Variable Speed ◽  
Modeling And Analysis ◽  
Operational Conditions ◽  
System A ◽  
The Press ◽  
Independent Variable ◽  
Electrical Motors ◽  
Experimental Pressure

This paper presents a theoretical–experimental pressure analysis of a hydraulic press brake with synchronized cylinders. In this machine, the motion of each cylinder is controlled by independent variable-speed electrical motors. This design has many benefits over traditional solutions using hydraulic proportional valves, such as higher energetic efficiency, nonrequirement of a heat exchanger, lower oil-cleanliness requirement, and reduced audible noise. However, a critical characteristic of the press brake is the use of double acting cylinders with large rods controlled by a pump in a closed circuit. In the studied system a cap end area roughly eleven times greater than the rod end area is used. Furthermore, the synchronized hydraulic press brake operates in six stages with particular characteristics implying in different flow rate demands and pressure behaviors. Based on experimental results, the pressures in specific parts of the circuit are analyzed and critical operational conditions are identified. A simulation model using Hopsan is validated and used to propose a hydraulic circuit modification. The proposed solution eliminates the tendency for pump cavitation and pressure surges that occur during the press break operational cycle.

scholarly journals Technical note: The beneficial role of stratigraphy on slope stabilization by drainage trenches

2019 ◽  
Author(s):  
Gianfranco Urciuoli ◽  
Luca Comegna ◽  
Marianna Pirone ◽  
Luciano Picarelli
Keyword(s):  
Hydraulic System ◽  
Time Lag ◽  
Drainage System ◽  
Technical Note ◽  
Natural Soil ◽  
Slope Stabilization ◽  
Simplified Approach ◽  
Classic Approach ◽  
Time Required

Abstract. Slope stabilization through drainage trenches is a classic approach in geotechnical engineering. Considering the low hydraulic conductivity of the soils in which this measure is usually adopted, a major constraint to the use of trenches is the time required to obtain a significant pore pressure decrease, here called “time lag”. In fact, especially when the slope safety factor is small, the use of drainage trenches may be a chancy approach due to the probability that slope deformations will damage the system well before it will become fully operative. However, this paper shows that the presence of persistent pervious natural soil layers in the slope can provide a significant benefit by increasing drainage efficiency and reducing time lag. As a matter of fact, any pervious layer that is intercepted by trenches may operate as part of the global hydraulic system, reducing the drainage paths. A simplified approach to design a drainage system accounting for the presence of a persistent pervious layer is proposed. This approach, which can exploit solutions available in literature for parallel drainage trenches, has been validated by numerical analyses.

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.

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