Mathematical Modelling of Reed Valve Behaviour in High Speed Two-Stroke Engines

1997 ◽  
Author(s):  
Robert Fleck ◽  
Anthony Cartwright ◽  
David Thornhill
Keyword(s):  
Mathematical Modelling ◽  
High Speed ◽  
Reed Valve

scholarly journals Brief Review and Mathematical Modelling of Air Cushioned Pressurized Paper Machine Headbox

2018 ◽  
Vol 7 (3.4) ◽  
pp. 57 ◽  
Author(s):  
Parvesh Saini ◽  
Rajesh Kumar
Keyword(s):  
Mathematical Modelling ◽  
High Speed ◽  
Paper Industry ◽  
Paper Machine ◽  
Efficient Operation ◽  
Precise Control ◽  
Paper Machines ◽  
Day By Day ◽  
Paper Machine Headbox

Today, the requirement of high grade papers is increasing day by day. To cater the need of high quality papers, new high-speed paper machines are being developed constantly. The whole economy of a pulp and paper industry depends on the quality of paper produced, quality of paper depends on the efficient operation of the major part of paper industry – paper machine. Paper machine is the heart of paper industry and has many subsystems. One of the important subsystem of paper machine is Headbox.   To have the desired quality papers, efficient working of headbox is highly required. To have desired operation from headbox, its precise control is necessary. The precise modelling of headbox, leads to design of efficient controllers for its proper control to get the desired response. This paper presents the mathematical modelling of headbox along with a brief review of various research performed on headbox.  

A hybrid beam element for mathematical modelling of high-speed flexible linkages

1989 ◽  
Vol 24 (1) ◽  
pp. 29-36 ◽  
Author(s):  
Xiaochun Gao ◽  
Zhiying King ◽  
Qixian Zhang
Keyword(s):  
Mathematical Modelling ◽  
High Speed ◽  
Beam Element ◽  
Hybrid Beam

An Experimental Study on Opening Delay of a Reed Valve for Reciprocating Compressors

2011 ◽  
Author(s):  
Fumitaka Yoshizumi ◽  
Yasuhiro Kondoh ◽  
Kazunori Yoshida ◽  
Takahiro Moroi ◽  
Masakazu Obayashi ◽  
...  
Keyword(s):  
High Speed ◽  
Gas Flow ◽  
Valve Seat ◽  
Film Rupture ◽  
Air Conditioners ◽  
Oil Film ◽  
Gas Compression ◽  
Valve Opening ◽  
Reed Valve ◽  
Opening Process

Automatic reed valves are widely used to control refrigerant gas flow in reciprocating compressors for automotive air conditioners. The oil film in the clearance between the reed and the valve seat causes a delay in opening of the valve. This opening delay of the discharge valve leads to over compression, which increases losses such as friction in sliding components and gas overheating. Therefore it is important to understand the behavior both of the oil film and the elastic reed deformation in order to reduce losses due to the delay. This study aims to develop an experimental setup that enables simultaneous visualization of the oil film rupture and measurement of the reed deformation, and to observe this behavior during the valve opening process. The gas-compression stroke is simulated by controlling compressed air with an electromagnetic valve. The oil film rupture is visually observed using a high speed camera through a special valve seat made of glass. The total deformation of the cantilever reed is identified by multipoint strain measurement with 12 strain gauges. The experiment finds that the opening process is divided into four stages. In the first stage, the reed remains stuck to the seat and deforms while the bore pressure increases. In the second stage, cavitation occurs in the oil film and the film starts to rupture. In the third stage, the oil film ruptures and the bore pressure starts to decrease. Finally, in the fourth stage, the reed is separated from the seat and the gas flows through the valve. Reducing the reed/seat contact area changes the reed deformation in the first stage, thereby increasing the reed/seat distance and realizing an earlier oil film rupture and a shorter delay.

scholarly journals Mathematical Modelling and Analysis of Memristors with and without its Temperature Effects

2017 ◽  
Vol 63 (2) ◽  
pp. 181-186 ◽  
Author(s):  
Bhavani Prasad ◽  
Kamaraju Maddu ◽  
Venkata Lakshmi
Keyword(s):  
Mathematical Modelling ◽  
Temperature Effects ◽  
High Speed ◽  
Ionic Mobility ◽  
Complete Analysis ◽  
Matlab Simulink ◽  
The Relationship

Abstract In this paper the main goal is to study the principle structure and characteristics of single and multiple memristors and also the temperature effects. The complete analysis described here is done by using matlab Simulink. The relationship between the on resistance, off resistance and ionic mobility with respect to temperature has been analyzed and shown graphically. The memristor can be used as a High speed switch and it can be used in non volatile computer memories due to its higher switching speeds.

Analysis of the Forces on a Nuclear Fuel Transport Flask in an Impact by a Train

1987 ◽  
Vol 201 (1) ◽  
pp. 55-68 ◽  
Author(s):  
J C Miles ◽  
T C K Molyneaux ◽  
H J Dowler
Keyword(s):  
Mathematical Modelling ◽  
High Speed ◽  
High Speed Train ◽  
Energy Agency ◽  
The Public ◽  
Rail Network ◽  
Analytical Work ◽  
The Impact ◽  
Public Demonstration ◽  
Primary Impact

The majority of fuel transport flask movements is on the public rail network and there has been concern over the possible consequences in the unlikely event of an accident involving a flask. To allay these concerns the Central Electricity Generating Board (CEGB) embarked on a programme of research into the behaviour of flasks in accidents culminating in the public demonstration of a train imapct in July 1984. The train crash demonstration was preceded by extensive analytical work directed at estimating the forces, effects and resulting motions of the primary impact. The mathematical modelling and analyses are described, with an earlier study of a high-speed train (HST) impact, and subsequent comparisons between the predictive estimates and the results of the demonstration. The impact effects expected and found are given in detail, with conclusions on the success of the estimating work and the relative severity of the IAEA (International Atomic Energy Agency) 9 m drop test compared with the train crash.

Data gathering and mathematical modelling for pitch stabilisation of a high speed catamaran

2011 ◽  
Vol 14 (3) ◽  
pp. 149 ◽  
Author(s):  
Peter Gu ◽  
Ronny Gundersen ◽  
Alf Olav Kalvik ◽  
Rudi Salvesen ◽  
Hamid Reza Karimi ◽  
...  
Keyword(s):  
Mathematical Modelling ◽  
High Speed ◽  
Data Gathering

scholarly journals Mathematical Modelling and Transient Thermal Analysis of Coupler-Rocker Bearing

2018 ◽  
Vol 225 ◽  
pp. 04005
Author(s):  
Abdullah Jamil ◽  
Masri B. Baharom ◽  
Tamiru Alemu Lemma
Keyword(s):  
Thermal Analysis ◽  
Mathematical Modelling ◽  
Heat Generation ◽  
Relative Motion ◽  
High Speed ◽  
Sliding Friction ◽  
Ball Bearings ◽  
Fluid Films ◽  
High Productivity ◽  
Precision Machine Tools

Friction is the resisting force between two bodies having relative motion. These bodies can be solid surfaces, fluid films or elements sliding against each other. There are many devices used to overcome sliding friction which include wheels and bearings. Ball bearings are used in many high speed and high precision machine tools because of their high productivity. A Crank-Rocker four bar mechanism consists of 4 linkages and 4 nodes. These nodes perform complex motions especially the coupler-rocker joint. In order to reduce the friction between these relatively moving links, ball bearings can be introduced. The coupler-rocker bearing oscillates about some axis as well as the raceways have some relative motion. Heat generation rate is not known for bearings performing this type of complex motion. This paper describes the mathematical modelling and thermal analysis of coupler-rocker bearing. Heat generation in the bearing can be estimated using this model. This can be countered by having proper lubrication and speed of bearing.

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