scholarly journals MATHEMATICAL MODELING OF THE ENGINE PARAMETERS INFLUENCE ON VEHICLE ACCELERATION DYNAMICS

2021 ◽  
pp. 3-11
Author(s):  
О.О. Osetrov ◽  
B. S. Chuchumenko
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Experimental Study ◽  
Dynamic Properties ◽  
Design Parameters ◽  
Labor Costs ◽  
Acceleration Time ◽  
Movement Dynamics ◽  
Vehicle Acceleration ◽  
And Control

The throttle response of a vehicle determines its dynamic properties and is characterized by an acceleration time from 0 to 100 km/h. An experimental study of the influence of vehicle parameters on its throttle response is associated with significant material and labor costs. At the stage of sketching the design of the vehicle, preliminary determination of design parameters and settings, it is rational to use mathematical models. In the existing models of the vehicles movement dynamics, the engine power, as a rule, is set by empirical dependencies and does not take into account the possibility of changing its parameters and characteristics. The paper proposes a mathematical model that combines models of the engine workflow and the dynamics of vehicle acceleration. The mathematical model of the engine workflow is a quasi-stationary thermodynamic model, in which combustion is described by the Vibe equation, and heat transfer with the walls is described by the Woschni equation. To check its adequacy, an experimental study of the VAZ-2108 engine was carried out to obtain external speed, load and control characteristics. Good agreement between the calculated and experimental data is shown. Vehicle acceleration simulation was carried out according to the method of E.A. Chudakov. The parameters of the VAZ-2108 car and the resistance forces during acceleration from 0 to 100 km / h have been determined. It is shown that the car accelerates from 0 to 100 km / h in 18.3 s, which corresponds to the experimental data and indicates the adequacy of the chosen techniques. The influence of changing the parameters and settings of the engine on the dynamics of vehicle acceleration has been investigated. It is shown that in order to achieve better dynamics of motion, the cylinder diameter and compression ratio must be maximized. The ignition timing, intake valve closing angle and excess air ratio have extremes. The efficiency of using a 16-valve cylinder head instead of an 8-valve one is shown. Based on the results of the studies, it was proposed to apply a set of engine parameters, which made it possible to reduce the acceleration time of the VAZ-2108 from 18.3 s to 13.2 s. Thus, the developed mathematical model makes it possible to quantitatively evaluate the influence of engine parameters on the dynamics of vehicle acceleration, to optimize the parameters and settings of the power plant and the vehicle as a whole.

Optimization of Solar Terrestrial Power Production Using Heat Engines

1970 ◽  
Vol 92 (2) ◽  
pp. 173-181 ◽  
Author(s):  
M. K. Selc¸uk ◽  
G. T. Ward
Keyword(s):  
Mathematical Model ◽  
Economic Performance ◽  
Storage System ◽  
Power Production ◽  
Design Parameters ◽  
Unsteady State ◽  
Labor Costs ◽  
Specific Design ◽  
Heat Engines ◽  
Power Costs

Mathematical model and computer programs have been developed for the analysis of the economic performance of a terrestrial solar power system using heat engines. Various combinations of cycle, collector, engine, storage system, and sink have been studied and the influence of design parameters on power costs examined for both the steady and unsteady state cases. Typical minimum power costs under central Australian conditions for units of 12 kw capacity at current levels of materials and labor costs range from 7 to 47 U. S. cents per kwh, according to the specific design of installation.

Geometrical Errors of Surfaces Milled with Convex and Concave Profile Tools

2018 ◽  
Vol 284 ◽  
pp. 281-288 ◽  
Author(s):  
Anatoly A. Fomin ◽  
V.G. Gusev ◽  
Zulfiya G. Sattarova
Keyword(s):  
Mathematical Model ◽  
Experimental Research ◽  
Transverse Plane ◽  
Geometrical Interpretation ◽  
Geometric Errors ◽  
Technological Operation ◽  
Geometric Accuracy ◽  
Labor Costs ◽  
Its Analysis ◽  
And Control

The geometrical interpretation of the transformation of cylindrical milling of products into profile milling by shaping cutters with a convex and concave cutting profile is considered. A mathematical model of geometric errors of profile surfaces processed with tools with the specified cutting profiles is developed. On the basis of the model and the results of its analysis, scientifically based recommendations for designing a technological operation for profile milling of products have been developed. When processing a product with a contoured cutter with a concave profile, it is recommended to calculate the geometric errors formed in the transverse plane of the shaping cutter, and when machining with a shaping cutter with a convex cutting profile - in the planes of both its ends. The calculated values of the above geometric errors should be compared with the values limited by the work drawing of the product. The implementation of these recommendations will reduce the labor costs for experimental research and control operations associated with ensuring a given geometric accuracy of products.

Mathematical Modeling and Experimental Study on Electrochemical Deburring of Miniature Holes

2013 ◽  
Vol 721 ◽  
pp. 382-386 ◽  
Author(s):  
Ze Fei Wei ◽  
Xing Hua Zheng ◽  
Zi Yuan Yu
Keyword(s):  
Mathematical Modeling ◽  
Experimental Data ◽  
Mathematical Model ◽  
Finite Element Analysis ◽  
Experimental Study ◽  
Finite Element ◽  
Electrochemical Machining ◽  
Current Density Distribution ◽  
Element Analysis ◽  
The Finite Element Analysis

The paper mainly focused on burr removal of the miniature hole drilled on aluminum plate by electrochemical machining. A mathematical model for the electrochemical deburring of miniature holes (M-ECD) was established based on the finite element analysis to the current density distribution. Both theoretical analysis and experimental study were held on the effects of many factors to the deburring results. The results proved that predictions based on our mathematical model were agreed with the experimental data comparatively.

scholarly journals Practical Modeling of Filter Filtration Efficiency

1990 ◽  
Vol 14 (6) ◽  
pp. 314-352
Author(s):  
J Kao
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Pressure Drop ◽  
Drag Force ◽  
Flow Rate ◽  
Filtration Efficiency ◽  
Design Parameters ◽  
Practical Design ◽  
General Mathematical Model

AbstractA simple and general mathematical model has been developed to calculate filter-filtration efficiency, which is based on practical design parameters: pressure drop, filter dimension, flow rate, and filament denier. This model has been verified by examining published experimental data, which include a broad range of design parameters. This model surpasses other models currently described in the literature in terms of accuracy. The drag force of the filter (which is accounted for by the pressure drop times the circumference squared, DP • C2) appears to be the most important contribution to filter-filtration efficiency, but its contribution can be drastically reduced by varying design parameters.

scholarly journals Experimental Study of the Forces and Parameters for the Opening of Incisions Inside Ocular Cavity

2020 ◽  
Author(s):  
Victor Olenin Ramírez-Beltrán ◽  
Luis Adrian Zuninga Avilés ◽  
Rosa Maria Valdovinos-Rosas ◽  
Jose Javier Reyes-Lagos ◽  
Giorgio Mackenzie Cruz-Martínez
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Experimental Study ◽  
Linear Relationship ◽  
Elastic Material ◽  
Experimental Results ◽  
Orbital Cavity ◽  
Experimental Procedure ◽  
The Mathematical Model

The experimental results of forces and efforts derived from the opening of incisions in the orbital cavity in a pig’s head are presented in this article. The different areas of the incision openings are related to the needs at the incision procedure for a dacryocystorhinostomy. In terms of the experimental procedure, an origin and a plane are defined so as to allow the location of the opening of the incision. The incisions are retracted along an axis of said origin. This procedure has been based on the mathematical model developed for this work, which consists of a procedure for determining the behavior of an incision when a force is applied to retract the skin. The experimental data obtained, suggests the existence of an almost linear relationship between the increment of resistance in relation to the time obtained for each opening, the same of which is deemed to be consistent with the behavior of an elastic material.

Preliminary Experimental Study of SMA Knitted Actuation Architectures

Aerospace ◽  
2006 ◽  
Author(s):  
Julianna Evans ◽  
Diann Brei ◽  
Jonathan Luntz
Keyword(s):  
Experimental Study ◽  
Smart Materials ◽  
Material Properties ◽  
Geometric Parameters ◽  
Design Parameters ◽  
Static Force ◽  
Vast Array ◽  
Material Parameters ◽  
Wide Range ◽  
And Control

Nature builds an immense set of materials exhibiting a wide range of behaviors using only a small number of basic compounds. The range of materials comes about through architecture, giving functional structure to the basic materials. Analogously, a new genre of actuators can be derived from existing smart materials through architecture. This paper presents a preliminary experimental study of knitted actuation architectures that yield high strains (up to 73%) with moderate forces (tens of Newtons or more) from basic contracting smart material fibers. By different combinations of the two primary knit loops – purl and knit – a variety of behaviors can be achieved including contraction, rolling, spirals, accordions, arching, and any combination of these across the fabric. This paper catalogs several basic knit stitches and their actuated form: garter, stockinette, seed, rib and I-cord. These knitted architectures provide performance tailorability (force, strain, stiffness, and motion) by manipulation of key design parameters such as the material properties of the wire, the geometric parameters (wire diameter, loop size, and gauge), and architectural parameters (stitch type and orientation). This is demonstrated via a quasi-static force-deflection experimental study with several shape memory alloy garter prototypes with varying geometric parameters. While the basic architecture of a knit is simple, it affords a vast array of architectural combinations and control of geometrical and material parameters that generate a myriad of gross motion capabilities beyond that of current day actuation strategies.

Modeling of pneumatic dual reciprocating bellows pump with flexible linkage

2020 ◽  
pp. 095440622093672
Author(s):  
Hu Liang ◽  
Gao Zhi-jian ◽  
Ge Tian-yi ◽  
Ruan Xiao-dong ◽  
Fu Xin
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Difference Method ◽  
Control Parameters ◽  
Effective Solution ◽  
Mechanical Parts ◽  
And Control ◽  
Flexible Linkage

Pneumatic dual reciprocating bellows pump has been widely used in chemical transportation due to its good sealing and anticorrosion performances. Nevertheless, the large outlet pulsation limits its performances on precise transportation and control of the fluid. Although the design of employing flexible linkage between the bellows has been proposed as an effective solution for this shortcoming, the design, manufacture, and control of the pump also become much more complicated. This paper presents a mathematical model to formulate the effects of structural, geometric, and control parameters to the output pulsation of pneumatic dual reciprocating bellows pump with flexible linkage. It is a dynamic model unifying several sub-models expressing the pneumatic, hydraulic, and mechanical parts in the pump, respectively. To ensure the accuracy, some special experiments are also employed to identify some key parameters in the model that cannot be determined directly. In addition, finite difference method is employed to solve the nonlinear equations. The model is well verified by comparing its computation results with experimental data. We believe that this study is valuable for guiding the design of pneumatic dual reciprocating bellows pump and optimizing its output pulsation.

Thermal Treatment of Self-Compacting Concrete in Cast-In Situ Construction

2017 ◽  
Vol 753 ◽  
pp. 315-320 ◽  
Author(s):  
Makhmud Kharun ◽  
Yury V. Nikolenko ◽  
Nadezhda A. Stashevskaya ◽  
Dmitry D. Koroteev
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Compressive Strength ◽  
Thermal Treatment ◽  
Strength Development ◽  
Labor Costs ◽  
Self Compacting Concrete ◽  
Construction Period ◽  
Cooling Period

Self-compacting concrete (SCC) is an innovative concrete that does not require vibration for placing and compaction. Thermal treatment (TT) of SCC can significantly accelerate the strength growth during cast-in-situ construction. This paper presents a technology of TT of structures for cast-in-situ construction with SCC. Application of this technology allows to reduce the turnover of formwork, the labor costs for construction, and the construction period. We also studied the issue of strength development of SCC during TT. For our study, we used SCC of grade C25. Test samples were cured with TT by infrared radiators for 7, 9, 11, 13, 16 and 24 hours. Then warmed samples were tested for compressive strength after 0.5, 4, 12 and 24 hours of cooling period. Study was carried out on the basis of analyzing, generalizing and evaluations of experimental data. A mathematical model is proposed for determining the compressive strength of SCC after one day of curing of SCC with TT.

Experimental Study of Shock Wave / Turbulent Boundary Layer Interaction

2010 ◽  
Vol 5 (2) ◽  
pp. 8-16
Author(s):  
Anton S. Vereshchagin ◽  
Vitaliy N. Zinoviev ◽  
Alexey Yu. Pak ◽  
Ivan V. Kazanin ◽  
Anna F. Fomina ◽  
...  
Keyword(s):  
Experimental Data ◽  
Boundary Layer ◽  
Mathematical Model ◽  
Shock Wave ◽  
Experimental Study ◽  
Turbulent Boundary Layer ◽  
Theoretical Investigation ◽  
Solid Particles ◽  
Nonlinear Filtration ◽  
Boundary Layer Interaction

The experimental and theoretical investigation of the process of helium permeation by hollow permeable solid particles (microspheres) was done. Mathematical model of this process was derived using the assumption of instant diffusion and nonlinear filtration law of gas through a particle shell. The comparison of experimental data and simulation of the process was made, the characteristic times of the process of helium permeation by microspheres were obtained.

Dynamic blocking phenomenon at a flow of stabled highly concentrated W/O emulsions

2006 ◽  
Vol 4 ◽  
pp. 117-134
Author(s):  
A.T. Akhmetov ◽  
V.V. Glukhov ◽  
M.V. Mavletov ◽  
A.G. Thelin
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Experimental Study ◽  
Oil Emulsion ◽  
Cylindrical Tubes ◽  
Dynamic Blocking ◽  
Hele Shaw Cell ◽  
Comparison With Experimental Data

There are experimental study of flows of reverse highly concentrated water-oil emulsion in the Hele-Shaw cell and cylindrical tubes of various diameters. There are structures are given from the flat flows and the behaviour of the emulsion in flat and cylindrical systems in a state of ”dynamic blocking“. A mathematical model for its description and a comparison with experimental data is offered.

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