Dimensionless Study on Efficiency and Speed Characteristics of a Compressed Air Engine

2015 ◽  
Vol 137 (4) ◽  
Author(s):  
Qihui Yu ◽  
Maolin Cai ◽  
Yan Shi ◽  
Chi Yuan
Keyword(s):  
Mathematical Model ◽  
Reference Values ◽  
Engine Performance ◽  
Power Source ◽  
Compressed Air ◽  
Working Process ◽  
Ic Engine ◽  
Rotating Speed ◽  
Inertia Parameter ◽  
The Mathematical Model

To eliminate the pollutants exhausting, this paper presents an idea of using compressed air as the power source for engines. Instead of an internal combustion (IC) engine, this automobile is equipped with a compressed air engines (CAEs), which transforms the energy of the compressed air into mechanical kinematic energy. Through analysis of the working process of a CAE, the mathematical model is setup. Experiments are carried out to verify the engine performance and the basic model’s validity. By selecting the appropriate reference values, the mathematical model is transformed to a dimensionless expression. The dimensionless speed and efficiency characteristics of the CAE are obtained. Through analysis, it can be obtained that the dimensionless average rotating speed is mainly determined by the intake duration angle, the dimensionless inertia parameter, the dimensionless exhaust pressure, and the scale factor of exhaust valve. Moreover, the efficiency of the CAE is mainly determined by the dimensionless exhaust pressure, the intake duration angle and the dimensionless cylinder clearance. This research can be referred to in the design of CAE and the study on optimization of the CAE.

Pressure Changes Induced by Whole Body Acceleration Shocks

1991 ◽  
Vol 113 (1) ◽  
pp. 27-29 ◽  
Author(s):  
E. Belardinelli ◽  
M. Ursino ◽  
G. Fabbri ◽  
A. Cevese ◽  
F. Schena
Keyword(s):  
Mathematical Model ◽  
Carotid Artery ◽  
Normal Pressure ◽  
Compressed Air ◽  
Whole Body ◽  
Body Acceleration ◽  
Vascular Bed ◽  
Pressure Changes ◽  
The Mathematical Model

In the present paper pressure changes induced by sudden body acceleration are studied “in vivo” on the dog and compared to the results obtainable with a recently developed mathematical model. A dog was fixed to a movable table, which was accelerated by a compressed air piston for less than 1 s. Acceleration was varied by changing the air pressure in the piston. Pressure was measured during the experiment at different points along the vascular bed. However, only data obtained in the carotid artery and abdominal aorta are presented here. The results demonstrated that impulse body accelerations cause significant pressure peaks in the vessel examined (about + 25 mmHg in the carotid artery with body acceleration of g/2). Moreover, pressure changes are rapidly damped, with a time constant of about 0.1s. From the present results it may be concluded that, according to the prediction of the mathematical model, body accelerations such as those occurring in normal life can induce pressure changes well beyond the normal pressure value.

Non-Dimensional Modeling and Simulation Analysis of Air Powered Engine

2013 ◽  
Vol 278-280 ◽  
pp. 307-314 ◽  
Author(s):  
Rong Zhi Song ◽  
Xiang Heng Fu ◽  
Mao Lin Cai
Keyword(s):  
Fossil Fuels ◽  
Simulation Analysis ◽  
Mathematic Model ◽  
Power Source ◽  
Compressed Air ◽  
Pollutant Emission ◽  
Energy Crisis ◽  
Power Devices ◽  
Working Process ◽  
Dimensional Modeling

Environmental pollution and energy crisis urge people to explore new power devices without burning fossil fuels and pollutant emission. Air powered engine (APE) is among these power devices. The medium and power source of APE is compressed air whose expansion makes it possible for APE to output work. Based on the principal and working process of APE, the mathematic model is established and afterwards made dimensionless. On the basis of the simulation of the non-dimensional mathematic model, the influences of the non-dimensional cylinder stroke and Kagawa coefficient on APE’s performances are analyzed

Optimization of the Hydraulic Bellows Engine Parameters Used to Drive Irrigation Reel Hose Machine - IATF 300

2012 ◽  
Vol 463-464 ◽  
pp. 1137-1140
Author(s):  
Ilie Biolan ◽  
Gheorghe Sovaiala ◽  
Alexandra Liana Visan
Keyword(s):  
Mathematical Model ◽  
Engine Performance ◽  
The Mathematical Model

This research was conducted during 1984-2009, on an irrigation reel hose machine - IATF-300 type. The paper presents the mathematical model that has been used to optimize hydraulic engine performance, its attempts where made taking in consideration the engine recommendations to test it to a load charge.

Design of New Flexible Spiral Conveying Mechanism and Experimental Device

2013 ◽  
Vol 469 ◽  
pp. 418-421
Author(s):  
Ye Tian ◽  
Dong Wen Wang ◽  
Li Zhang ◽  
Liang Ding ◽  
Fei Yang ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Power Consumption ◽  
Food Packaging ◽  
Compliant Mechanism ◽  
Discrete Element ◽  
Screw Conveyor ◽  
Working Process ◽  
Work Process ◽  
Helical Blade ◽  
The Mathematical Model

Screw conveyor is widely used in food packaging field. This paper puts forward a new kind of flexible blades of screw conveyor, to replace the traditional rigid helical blade. Based on the theory of compliant mechanism, the motion are analyzed when the flexible screw blade works. Based on the medium mechanics theory related, The interaction between flexible screw and material relations are analyzed, and the mathematical model of power consumption and transmission capacity are established. The work process of flexible screw working process is simulated with discrete element software EDEM. The result verified the theory is correct.

scholarly journals Modelling Methodology of Piston Pneumatic Air Engine Operation

2019 ◽  
Vol 13 (4) ◽  
pp. 271-278
Author(s):  
Dariusz Szpica ◽  
Michal Korbut
Keyword(s):  
Mathematical Model ◽  
Exhaust System ◽  
Compressed Air ◽  
System Control ◽  
Engine Operation ◽  
Air Supply ◽  
Mechanical Subsystem ◽  
Modelling Methodology ◽  
Lumped Elements ◽  
The Mathematical Model

Abstract The article presents a mathematical model describing the operation of a piston pneumatic air engine. Compressed air engines are an alternative to classic combustion solutions as they do not directly emit toxic exhaust components. In the study, a modified internal combustion piston engine was adopted as pneumatic engine. The mathematical model was divided on the two subsystems, that is, mechanical and pneumatic. The mechanical subsystem describes a transformation of compressed air supply process parameters to energy transferred to the piston and further the conversion of the translational to rotary motion; in turn, in the pneumatic part, the lumped elements method was used. Calculations were carried out using the Matlab-Simulink software, resulting in the characteristics of external and economic indicators. The presented mathematical model can be ultimately developed with additional elements, such as the intake or exhaust system, as well as timing system control.

scholarly journals Working Characteristics of Variable Intake Valve in Compressed Air Engine

2014 ◽  
Vol 2014 ◽  
pp. 1-9
Author(s):  
Qihui Yu ◽  
Yan Shi ◽  
Maolin Cai
Keyword(s):  
Mathematical Model ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Compressed Air ◽  
Maximum Output ◽  
Output Torque ◽  
Good Consistency ◽  
Intake Pressure ◽  
Set Up ◽  
The Mathematical Model

A new camless compressed air engine is proposed, which can make the compressed air energy reasonably distributed. Through analysis of the camless compressed air engine, a mathematical model of the working processes was set up. Using the software MATLAB/Simulink for simulation, the pressure, temperature, and air mass of the cylinder were obtained. In order to verify the accuracy of the mathematical model, the experiments were conducted. Moreover, performance analysis was introduced to design compressed air engine. Results show that, firstly, the simulation results have good consistency with the experimental results. Secondly, under different intake pressures, the highest output power is obtained when the crank speed reaches 500 rpm, which also provides the maximum output torque. Finally, higher energy utilization efficiency can be obtained at the lower speed, intake pressure, and valve duration angle. This research can refer to the design of the camless valve of compressed air engine.

Mathematical Model of Oceanographic Buoy Solar Energy Power Source Design Based on Double Batteries

2013 ◽  
Vol 740 ◽  
pp. 782-786
Author(s):  
Guo Liang Zou ◽  
Xin Nan Lou
Keyword(s):  
Mathematical Model ◽  
Solar Energy ◽  
Power Supply System ◽  
Supply And Demand ◽  
Power Source ◽  
Supply System ◽  
Rainy Weather ◽  
The Mathematical Model ◽  
Engineering Projects ◽  
Rainy Days

To implement the objective of steady operation of the marine observation buoy system on the sea throughout the year,based on energy balance between supply and demand, this paper presents the mathematical model of solar energy power supply system derived from double batteries switching technology. The batteries are divided into main batteries and auxiliary batteries. The main batteries are used regularly and the auxiliary batteries are used in periodic rainy weather. The main advantage of this model is that the capacity of auxiliary batteries can be dynamic calculated based on the numbers of maximum continuous rainy days and minimum intervals between rainy days. The batteries capacity is sufficient but not redundant. This design project has been tested on marine buoy and the accuracy of the model is splendid for most engineering projects.

Mathematic Model of Displacement Control Unit for Screw Distributor of Asphalt Paver

2013 ◽  
Vol 774-776 ◽  
pp. 295-298
Author(s):  
Zhi Nan Mi ◽  
Long An Chen ◽  
Jia Tao Tang
Keyword(s):  
Mathematical Model ◽  
Hydraulic System ◽  
Control Unit ◽  
Mathematic Model ◽  
Displacement Control ◽  
Rotating Speed ◽  
Dynamical Characteristics ◽  
Inertial Element ◽  
The Mathematical Model

Displacement control unit is an important part of hydraulic system for screw distributor. By adjusting the angle of swashplate, it can change the flow rate of pump and rotating speed of screw distributor. The rotating speed of screw distributor has influence on quality of road. The mathematical model of displacement control unit is presented. Its dynamical characteristics are analyzed. The mathematical model includes a reset spring gradient. The reset spring gradient is much smaller than the hydraulic spring rate, the effect of the reset spring gradient can be neglected. So an inertial element can be substituted by an integration element.

scholarly journals Mathematical modeling of piezoelectric step-engine work

2019 ◽  
Vol 3 (3) ◽  
pp. 164-170 ◽  
Author(s):  
A. V. Azin ◽  
S. A. Kuznetsov ◽  
S. A. Ponomarev ◽  
S. V. Ponomarev ◽  
S. V. Rikkonen
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
Load Level ◽  
Working Process ◽  
Positioning Accuracy ◽  
Vibration Period ◽  
Piezo Element ◽  
Technical Specifications ◽  
Element Activity ◽  
The Mathematical Model

In the article the results of new piezoelectric step-engine research are presented. The original construct of piezoelectric step-engine is contained in special engineering lever called grab device that can organize back and forward rod’s motion with only one piezo element activity. To choose the effective process of piezoelectric step-engine work the mathematical model was created. This mathematical model describes inner piezoelectric step-engine process like a non-linear vibrational system. The mathematical model identifies speed of piezoelectric step-engine elements over the vibration period with different frequency, load level and voltage. The prototype of piezoelectric step-engine was produced. Experimental issues were conducted. Piezoelectric step-engine’s technical specifications are positioning accuracy over 10–6 meter, speed of movement over 10 mm per minute with weight of load to 1 kg and voltage to 100 Volt. On the results of experimental research it is defined that mathematical model enables to model working process of piezoelectric stepengine with an error not more than 10 %. This research verifies viability of proposed construction and provides the way to increase output power of piezoelectric step-engine.

scholarly journals Алгоритм классификации технического состояния топливного регулятора в пространстве параметров рабочего процесса

2021 ◽  
pp. 158-169
Author(s):  
Игорь Валериевич Оганян ◽  
Сергей Валериевич Епифанов
Keyword(s):  
Mathematical Model ◽  
Quality Criterion ◽  
Diagnostic Algorithm ◽  
Test Sample ◽  
Classification Algorithm ◽  
The State ◽  
Technical State ◽  
Working Process ◽  
The Mathematical Model

This article solves the problem of constructing an algorithm for classifying the technical state of the fuel regulator of a turboshaft engine of a helicopter in the parameter space of the regulator's working process and obtaining estimates of the state of the investigated product. In the introduction to this work, the main methods of classifying the technical state are considered, and a brief justification for the choice of the method for classifying the state of the product in the space of measured parameters used to construct the algorithm is considered in this article, is given. The criteria for the presence of a malfunction in the investigated controller are determined and the basic requirements for the classification algorithm are formed. To simplify the problem being solved, many assumptions about the diagnosed defects were made. The article provides descriptions of all components of the classification algorithm. A brief description of the mathematical model of the fuel regulator is given. The operating mode of the regulator for analysis is selected, and the list of state parameters required for diagnostics and the list of diagnostic parameters of the working process is given. The technique of linearization of the mathematical model of the controller and the technique of constructing the matrix of influence coefficients, which is the basic element of the entire algorithm, is described. The probabilistic characteristic of the credibility of the classification algorithm is determined, and the derivation of the formula for its calculation, based on the Bayes theorem, is also given. To assess the quality of the classification by the diagnostic algorithm, a test sample of workflow parameters was formed. The methodology for constructing a test sample is described and its size is determined. After the product condition estimates are obtained according to the test sample data by the classification algorithm, such a quality criterion as the recall is calculated. As a result of assessing the recall, a table was formed with the values of this criterion for each class. The recall of the algorithm on average for all defects was 89 %. The conclusions indicate possible methods for improving the quality of diagnosis by the algorithm.

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