The New AVL Medium Speed Single Cylinder Engine

2003 ◽  
Author(s):  
Wolfgang H. Kling ◽  
Wilhelm Greylinger
Keyword(s):  
Fuel Injection ◽  
Low Cost ◽  
Analytical Techniques ◽  
Customer Requirements ◽  
Single Cylinder ◽  
Cylinder Test ◽  
Engine Design ◽  
Medium Speed ◽  
Base Engine ◽  
History Of

For many years engine researchers and development specialists have appreciated the benefits offered by performing engine development and testing on Single Cylinder Engines (SCEs). The SCE essentially isolates the cylinder, providing a powerful tool for detailed combustion research, while mitigating the possibility of misleading data results due to cylinder-to-cylinder interactions. Single Cylinder Engines also offer increased accessibility to key components, allowing for rapid changes, thereby expediting the testing process. Furthermore, SCE testing becomes a practical necessity for large engines with bores greater than 150 mm, where a very large multi-cylinder engine installation becomes very facility limited and impractical. AVL has a long history of design and development of engines in the medium speed range. In addition to well-proven analytical techniques AVL has developed a number of Single Cylinder Engines for testing to support both internally-funded and customer-supported research programs. Since individual customer requirements for single cylinder research may vary considerably, SCEs have typically been unique builds, designed, structurally validated, machined and assembled from “the ground up.” Whilst this approach usually results in a final product which meets the customer’s needs, it is costly, extremely time consuming, prone to numerous design iterations and is often inapplicable for other engine design applications. In seeking a solution to this problem, AVL has come up with an approach which results in an SCE which is quickly, yet inexpensively developed and built. It is durable yet adaptable to specific customer requirements. AVL’s approach has been to develop a successful base engine platform for medium speed single cylinder test engines, and then modify the unit as necessary to meet customer requirements using the customer-provided power cylinder, fuel injection equipment (FIE) and other “upper end” components. This approach results in a robust, reliable, proven design at low cost, which will meet specific customer research needs for many years.

Effects of Different Biodiesel Blends on Heat Release and Its Related Parameters

2006 ◽  
Author(s):  
Girish Parvate-Patil ◽  
Manuel Vasquez ◽  
Malcolm Payne
Keyword(s):  
Diesel Engine ◽  
Heat Release ◽  
Fuel Injection ◽  
Load Condition ◽  
Engine Performance ◽  
Injection Pressure ◽  
Single Cylinder ◽  
Medium Speed ◽  
Performance And Emissions ◽  
Fuel Injection Pressure

This paper emphasizes on the effects of different biodiesels and diesel on; heat release, ignition delay, endothermic and exothermic reactions, NOx, fuel injection pressure due to the fuel’s modulus of elasticity and cylinder pressure. Two 100% biodiesel and its blends of 20% with of low sulfur #2 diesel, and #2 diesel are tested on a single cylinder diesel engine under full load condition. Engine performance and emissions data is obtained for 100% and 20% biodiesels blends and #2 diesel. Testes were conducted at Engine Systems Development Centre, Inc. (ESDC) to evaluate the effects of biodiesel and its blends on the performance and emissions of a single-cylinder medium-speed diesel engine. The main objective of this work was to gain initial information and experience about biodiesel for railway application based on which biodiesel and its blends could be recommended for further investigation on actual locomotives.

Emission and Performance Effects of Biodiesel Blends of B5, B20 and B100 in a Single-Cylinder Medium-Speed Diesel Engine

2006 ◽  
Author(s):  
Mohammad R. Moshiri ◽  
Malcolm L. Payne ◽  
Manuel Vasquez
Keyword(s):  
Fuel Injection ◽  
Fuel Efficiency ◽  
Injection Pressure ◽  
Frying Oil ◽  
Biodiesel Blends ◽  
Single Cylinder ◽  
Oil Blends ◽  
Medium Speed ◽  
Performance Effects ◽  
Smoke Opacity

Biodiesel blends from two different origins (Canola and Frying oil) were prepared and tested at B5, B20 and B100 concentrations on single cylinder medium-speed research engine at ESDC Inc. The effect of these six fuels (three concentrations, B5, B20 and B100 of each source) on exhaust emissions, fuel consumption (BSFC) and engine horsepower were compared to those of Low Sulphur # 2 Petro-diesel fuel. The engine was tested under three different test settings; Idle, 50% Load and 100% Load. The results showed: reduction in emissions (except NOX) for B5 and B20 of Canola and Frying oil blends while maintaining engine power and fuel efficiency in an acceptable range (within 2%). For B100 blends, reductions were more significant for CO and Smoke opacity but significant increase for NOX and PM emissions. Engine break horsepower was also decreased by %8–%9 with B100 blends. Engine Heat Value Release rate and Fuel Injection Pressure were also recorded for better assessment of fuel efficiency and emission results.

Economic Consequences of War

1943 ◽  
Vol 3 (S1) ◽  
pp. 1-8
Author(s):  
Curtis P. Nettels
Keyword(s):  
Low Cost ◽  
Economic Consequences ◽  
Competitive Advantages ◽  
Competitive Position ◽  
The Past ◽  
History Of ◽  
Costs Of Production ◽  
Foreign Competitors

One influence of war has repeatedly asserted itself in the past—an effect on the costs of production and on the competitive position of the industries and firms of victorious or neutral nations. This subject needs more study, but certain facts suggest a hypothesis, of three parts. First: war expands some industries or concerns, increases their efficiency, enables them to operate, at the end of the struggle, on a comparatively low-cost basis, intensifies their competitive advantages, and improves their position in relation to foreign competitors. Second: war—for the duration—bolsters up some high-cost units by enabling them to sell at a profit all they can produce. The end of the war places such high-cost units at a disadvantage in the process of absorbing the shocks of the transition to a peacetime economy. Third: the history of postwar periods usually exhibits a sharp contest between such low-cost and high-cost enterprises. While “low cost” and “high cost” may refer to the relative positions of units within the same country, in most of this discussion, the terms will be applied to the producers of one country (either victor or neutral) to mean that their costs are low or high in comparison with those of their foreign competitors.

A Transient Single Cylinder Test System for Engine Research and Control Development

2005 ◽  
Author(s):  
John L. Lahti ◽  
Matthew W. Snyder ◽  
John J. Moskwa
Keyword(s):  
Test System ◽  
Intake Manifold ◽  
Test Accuracy ◽  
Test Configuration ◽  
Single Cylinder ◽  
Cylinder Test ◽  
Single Cylinder Engine ◽  
Wide Range ◽  
Reduce Development Time ◽  
High Bandwidth

A transient test system was developed for a single cylinder research engine that greatly improves test accuracy by allowing the single cylinder to operate as though it were part of a multi-cylinder engine. The system contains two unique test components: a high bandwidth transient hydrostatic dynamometer, and an intake airflow simulator. The high bandwidth dynamometer is used to produce a speed trajectory for the single cylinder engine that is equivalent to that produced by a multi-cylinder engine. The dynamometer has high torque capacity and low inertia allowing it to simulate the speed ripple of a multi-cylinder engine while the single cylinder engine is firing. Hardware in loop models of the drivetrain and other components can be used to test the engine as though it were part of a complete vehicle, allowing standardized emissions tests to be run. The intake airflow simulator is a specialized intake manifold that uses solenoid air valves and a vacuum pump to draw air from the manifold plenum in a manner that simulates flow to other engine cylinders, which are not present in the single cylinder test configuration. By regulating this flow from the intake manifold, the pressure in the manifold and the flow through the induction system are nearly identical to that of the multi-cylinder application. The intake airflow simulator allows the intake runner wave dynamics to be more representative of the intended multi-cylinder application because the appropriate pressure trajectory is maintained in the intake manifold plenum throughout the engine cycle. The system is ideally suited for engine control development because an actual engine cylinder is used along with a test system capable of generating a wide range of transient test conditions. The ability to perform transient tests with a single cylinder engine may open up new areas of research exploring combustion and flow under transient conditions. The system can also be used for testing the engine under conditions such as cylinder deactivation, fuel cut-off, and engine restart. The improved rotational dynamics and improved intake manifold dynamics of the test system allow the single cylinder engine to be used for control development and emissions testing early in the engine development process. This can reduce development time and cost because it allows hardware problems to be identified before building more expensive multi-cylinder engines.

Synthesis, Characterization, Applications, and Toxicity of Green Synthesized Nanoparticles

2021 ◽  
Vol 22 ◽  
Author(s):  
João Marcos Pereira Galúcio ◽  
Sorrel Godinho Barbosa de Souza ◽  
Arthur Abinader Vasconcelos ◽  
Alan Kelbis Oliveira Lima ◽  
Kauê Santana da Costa ◽  
...  
Keyword(s):  
Green Synthesis ◽  
Low Cost ◽  
Chemical Properties ◽  
Analytical Techniques ◽  
Industrial Applications ◽  
Synthesis Methods ◽  
Methods Of Synthesis ◽  
Food Applications ◽  
Living Organisms ◽  
Harmful Effects

: Nanotechnology is a cutting-edge area with numerous industrial applications. Nanoparticles are structures that have dimensions ranging from 1–100 nm which exhibit significantly different mechanical, optical, electrical, and chemical properties when compared with their larger counterparts. Synthetic routes that use natural sources, such as plant extracts, honey, and microorganisms are environmentally friendly and low-cost methods that can be used to obtain nanoparticles. These methods of synthesis generate products that are more stable and less toxic than those obtained using conventional methods. Nanoparticles formed by titanium dioxide, zinc oxide, silver, gold, and copper, as well as cellulose nanocrystals are among the nanostructures obtained by green synthesis that have shown interesting applications in several technological industries. Several analytical techniques have also been used to analyze the size, morphology, hydrodynamics, diameter, and chemical functional groups involved in the stabilization of the nanoparticles as well as to quantify and evaluate their formation. Despite their pharmaceutical, biotechnological, cosmetic, and food applications, studies have detected their harmful effects on human health and the environment; and thus, caution must be taken in uses involving living organisms. The present review aims to present an overview of the applications, the structural properties, and the green synthesis methods that are used to obtain nanoparticles, and special attention is given to those obtained from metal ions. The review also presents the analytical methods used to analyze, quantify, and characterize these nanostructures.

An Interpretation and Analysis on the Polychromy of Attic Korai from Votive and Funerary Contexts

2021 ◽  
Author(s):  
Lilly Hickox
Keyword(s):  
Spectral Data ◽  
Analytical Techniques ◽  
Surface Cleaning ◽  
Complete Evaluation ◽  
Literary Sources ◽  
History Of ◽  
Asking Questions ◽  
Colour Patterns ◽  
Greek World ◽  
Marble Surface

The characteristic woman of Archaic Greek sculpture, the kore (pl. korai) stands proud, rigid, frontal, and omnisciently smirking at her viewer with the famous Archaic smile. She has been interpreted as an attendant, goddess, or deceased maiden, wearing representations of draped diaphanous robes, jewelry, and bearing offerings. Yet where her now clean marble surface exists once was intricately illuminated with vibrant pigments, inlaid stones, metals, and often accompanied by accessories of various materials. Recent advancements in analytical techniques have enabled scholars to delve deeper into the study of these sculptures, uncovering traces of pigments which would otherwise be left undetected. However, the image that these colours paint has yet to be thoroughly analysed and a history of intentional removal and surface cleaning has postponed a complete evaluation of the sculptures. In Attica, from the sixth to the early 5th century BCE, korai reflect stylistic progression and variation within and between archaeological contexts. A palette of colours was used to display features now lost to the modern eye. This paper examines the korai, proposing meaning through colour, patterns, and representations. Using polychrome reconstructions, spectral data, pottery, archaeological evidence, and ancient literary sources, the author interpreted the polychromy and decorative elements of Attic korai from votive and funerary contexts. Asking questions on symbolism, utility, cultural connection, and identity of the sculptures; this paper explains the use of pigments in relation to the symbolism of the sculptures and to their role in the greater framework of the Archaic Greek world.

Towards Parallel Cable-Driven Pantographs

2011 ◽  
Author(s):  
Simon Perreault ◽  
Philippe Cardou ◽  
Cle´ment Gosselin
Keyword(s):  
Low Cost ◽  
Output Link ◽  
Static Balancing ◽  
New Class ◽  
Nonlinear Springs ◽  
Preliminary Validation ◽  
Important Challenge ◽  
History Of ◽  
Working Principle ◽  
Two Degree Of Freedom

We propose a new class of pantographs, i.e., of mechanisms that allow the reproduction of the displacements of an input link, the master, with an output link, the slave. The application we envision for these devices is the telemanipulation of objects from small distances, at low cost, where magnetic fields or other design constraints prohibit the use of electromechanical systems. Despite the long history of pantographs, which were invented in the 17th century, the class of pantographs proposed here is new, as it relies on parallel cable-driven mechanisms to transmit the motion. This allows the reproduction of rigid-body displacements, while previous pantographs were limited to point displacements. This important characteristic and others are described in the paper. One important challenge in the design of the proposed systems is that the cables must remain taut at all time. We address this issue by introducing nonlinear springs that passively maintain a minimum tension in the cables, while approximating static balancing of the mechanism over its workspace. Approximating static balancing allows the forces applied at the slave to reflect more accurately at the master, and vice versa. As a preliminary validation, a two-degree-of-freedom parallel cable-driven pantograph is designed. A prototype of this apparatus that does not include approximate static balancing is built, which demonstrates the working principle of these mechanisms.

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