The Evaluation of the Stress-strain State for the Cylinder Heads of High-powered Diesel Engines using the Multiphysics ANSYS Technology

AbstractThe researchers have built a calculation model for comparative assessments of the heat balance, heat and stress-strain state for the head and cylinder liner of forced diesel engine, which model takes into account the redistribution of the quenching fluid between the cylinder head and crankcase. Computational experiments have been performed. The trade-off approach to the design of a diesel engine cooling system has been demonstrated to find out that improved cooling of the cylinder head is accompanied by deteriorating thermal state of the crankcase and the cylinder liner

Effect of Groove Texture on Deformation and Sealing Performance of Engine Piston Ring

During the present study, a double groove texture was designed on the surface of a piston ring to improve the sealing performance between the piston ring and cylinder liner. The experimental design method was used to fabricate the test plan according to the groove width, depth, and spacing. By using the thermal–structural coupling analysis method, the finite element analysis of the standard piston ring and the textured piston ring was carried out to simulate the deformation state of the cylinder liner system of the piston ring group during the working stroke. The piston rings with different parameters designed by the test scheme were manufactured by wire electrical discharge machining, and the self-made experiment device carried out the sealing test. The results showed that the groove texture could improve the sealing performance of the piston ring, and the analyzed results demonstrated that the groove texture had little effect on the maximum deformation of the piston ring. Still, it could significantly reduce the minimum deformation of the piston ring group. A piston ring with groove texture would improve the sealing performance and reduce the deformation during the work stroke. During the test, the average deformation of the No.7 piston ring group, with a groove depth of 1 mm, a groove width of 0.5 mm, and a groove spacing of 0.1 mm, was the smallest, about 29.6% lower than that of the standard piston ring group. The sealing performance of the No.7 piston ring group was the best, and the reduction rate of the top gas leakage rate was 52.18%. During the present study, the sealing performance of the piston ring was improved by designing the grooved structure on the piston ring surface, thereby improving the fuel economy and power performance of the engine. The present study could provide a reference for the engineering field to design a piston ring with high sealing performance

Design of an innovative olive picking machine

This work describes the complete design of an olive picking machine especially conceived for secular olive plants with the purpose of increasing the mechanization level of the harvest operation and permitting the production of high quality oil; the design is made considering all the mechanical, agronomical and economical aspects involved in this issue. Once defined the picking technique, the first step consists in the design of the shacking device used for the separation of the olives from the plant, the next step is the design of the support structure, including the arms and the frame; finally there is a description of the hydraulic plant that drives the moving parts of the machine; in order to increase the flexibility of the machine, it is adapted also for other works, like pruning, that can be performed outside the harvest season. Starting from the principal characteristics of the cultivations the design of the machine and its implementation is realized considering all functional features, including verifications of resistance according to the current standards; finally the economic aspects are hinted to confirm the marketing appeal of the machine

Design of an innovative olive picking machine

 This work describes the complete design of an olive picking machine especially conceived for secular olive plants with the purpose of increasing the mechanization level of the harvest operation and permitting the production of high quality oil; the design is made considering all the mechanical, agronomical and economical aspects involved in this issue.  Once defined the picking technique, the first step consists in the design of the shacking device used for the separation of the olives from the plant, the next step is the design of the support structure, including the arms and the frame; finally there is a description of the hydraulic plant that drives the moving parts of the machine; in order to increase the flexibility of the machine, it is adapted also for other works, like pruning, that can be performed outside the harvest season.  Starting from the principal characteristics of the cultivations the design of the machine and its implementation is realized considering all functional features, including verifications of resistance according to the current standards; finally the economic aspects are hinted to confirm the marketing appeal of the machine.Keywords: Olive picker, mechanical harvest, olive oil, secular olive tree

Modelado y análisis computacional del conjunto móvil de un motor de combustión interna alimentado con diésel y biodiésel

Modelar el conjunto móvil de un motor de combustión interna (tractor agrícola), alimentado con diésel y biodiésel para comparar los efectos generados en los componentes mediante el uso de herramientas computacionales.El presente documento corresponde a un estudio realizado al conjunto móvil de un motor de combustión interna alimentado con diésel y biodiésel B10 de higuerilla, el objetivo fue comparar los efectos generados por los combustibles en las piezas. Se tomó las medidas de los elementos (pistón, biela y cigüeñal) para realizar un modelado 3D en SOLIDWORKS, posteriormente se realizó un análisis computacional de elementos finitos por medio del software ANSYS, para ello fueron calculados los parámetros necesarios para la simulación siendo el más importante la fuerza generada por cada combustible sobre la cabeza del pistón. Las propiedades de los materiales fueron añadidas a cada elemento tomando en cuenta los materiales comúnmente usados en motores MEC. Para la simulación se utilizó un análisis estático con el fin de obtener la deformación de las piezas estudiadas y un análisis transitorio para conseguir resultados de tensiones y el factor de seguridad de forma dinámica. Mediante un estudio de sistema estructural se aplicó solo las fuerzas ejercidas sobre los elementos y se usó un análisis termo-estructural para combinarlo con la temperatura a la que trabaja el motor. Como resultado de la simulación, el pistón en el análisis estructural disminuye la deformación en 0,85% y en un termo-estructural un 0,78% al usar biodiésel, mientras los esfuerzos se reducen en 1,48% y 0,04%. En la biela la deformación decrece con el biocombustible en 0,85% y 1,04%, y sus tensiones amenoran en un 9,93% y 0,88% con los dos tipos de análisis respectivamente. Por último, el cigüeñal sufre menor deformación con el combustible alternativo en 0,85% y 0,98%, y sus esfuerzos 1,10% y 0,97%. En todos los casos la diferencia es mínima al usar biodiésel B10 lo que hace que el uso de este combustible sea rentable.Ingenierí

Design and development of auxiliary components for a new two-stroke, stratified-charge, lean-burn gasoline engine

A unique stepped-piston engine was developed by a group of research engineers at Universiti Teknologi Malaysia (UTM), from 2003 to 2005. The development work undertaken by them engulfs design, prototyping and evaluation over a predetermined period of time which was iterative and challenging in nature. The main objective of the program is to demonstrate local R&D capabilities on small engine work that is able to produce mobile powerhouse of comparable output, having low-fuel consumption and acceptable emission than its crankcase counterpart of similar displacement. A two-stroke engine work was selected as it posses a number of technological challenges, increase in its thermal efficiency, which upon successful undertakings will be useful in assisting the group in future powertrain undertakings in UTM. In its carbureted version, the single-cylinder aircooled engine incorporates a three-port transfer system and a dedicated crankcase breather. These features will enable the prototype to have high induction efficiency and to behave very much a two-stroke engine but equipped with a four-stroke crankcase lubrication system. After a series of analytical work the engine was subjected to a series of laboratory trials. It was also tested on a small watercraft platform with promising indication of its flexibility of use as a prime mover in mobile platform. In an effort to further enhance its technology features, the researchers have also embarked on the development of an add-on auxiliary system. The system comprises of an engine control unit (ECU), a directinjector unit, a dedicated lubricant dispenser unit and an embedded common rail fuel unit. This support system was incorporated onto the engine to demonstrate the finer points of environmental-friendly and fuel economy features. The outcome of this complete package is described in the report, covering the methodology and the final characteristics of the mobile power plant

Failure rate analysis of four agricultural tractor models in southern Iran

Tractors play an important role in agricultural mechanization.  A repairable mechanical system (as agricultural tractor) is prone to deterioration or repeated failures.  In this study, the owners of three hundred tractors, which include Massey Ferguson (MF285 model and MF399 model), John Deere (JD3140 model) and Universal (U650 model), were interviewed, from five regions of Khouzestan Province.  A regression model was used to predict the tractors failure rate.  The machine failure pattern was carefully studied and key factors affecting the failure rate were identified in these regions.  The data obtained from farm records valid by using questionnaire was separated into two groups according to how those tractors were stored.  Results showed that the majority of recorded failures were observed in the electrical system for all tractors.  According to the results of the research, different storage policies significantly affected the failure rate for MF285, MF399 and JD3140 tractors (63%, 55.5% and 61.6% respectively), whereas inside storage of U650 tractors slightly decreased the failure rate (7.4%).  Also, closed storage condition was found to reduce annual repair and maintenance costs by 33.6%, 33.6%, 29.6% and 2.56% in comparison with open air storage condition for the study tractors respectively.  The observational estimate showed that all tractors were in the wear out period under outside storage conditions, against inside storage had a considerable effect on the failure rate of MF285, MF399 tractors and they were commonly in a randomized breakdown period within their useful life, JD3140 tractors were in the beginning of wear out period, but U650 tractors were in the wear out period for both storage conditions.  Therefore, it can be said that by storing the tractors out of the weather conditions slowly exposed by failure and breakdowns, especially in warm climate and presented of dust haze phenomenon.   Keywords: failure rate, tractor, storage condition, Khouzesta

Etude du comportement en fatigue de la bielle ? Application sous ANSYS ?

La Bielle à été depuis son invention l'objet de plusieurs études de recherches vu son importance dans les machines par le rôle primordiale qu'elle assure, et qui consiste en la transformation d'un mouvement linéaire en un mouvement rotationnel, et ce en supportant les différentes charges dont elle est soumise. Notre travail sur le comportement en fatigue de la bielle d'un moteur à combustion interne consiste en premier lieu en une étude sur la distribution des contraintes ainsi que la localisation des endroits critiques sous le code de calcul Ansys en 3-D, puis une comparaison de l'analyse de la fatigue en 2-D entre deux matériaux différents utilisé dans la construction des bielles tout en créant des fissures aux endroits critiques définis précédemment

Effects of duty cycles on diesel engine component life estimation

Engine manufactures have relied on over designed of engines and performance testing to ensure product reliability. The efforts to maximize efficiency and to predict performance characteristics have evoked an interest to study the in-cylinder pressure throughout the respective duty cycle. The duty cycle of an engine is defined as the history of speed and load conditions over which the engine operates in a specific application. Understanding the transient on-road diesel engine duty cycles has been one of major goals for the engine developers. To date there have not been any research performed to identify a wide variety of on-road diesel engine duty cycles. One of the world largest diesel engine manufactures, Cummins Inc., had interest in developing and understanding how the effective life of a diesel engine component is related to its duty cycle. West Virginia University Engine and Emissions Research Laboratory (EERL) was commissioned to conduct this study.;The objective of this study is to create a mathematical model that predicts the effective life of diesel engine components with respect to its operational duty cycle. In particular, power cylinder components were considered along with the variations of in-cylinder pressure. Four different duty cycles were evaluated in this study: a concrete mixer, heavy hauler, dump truck, and a transit bus. In-cylinder pressure data for all four duty cycles were statistically analyzed using the tools from non-parametric function and regression analysis. A mathematical model that predicts the power cylinder component lives was created. Mimicking the infield operation, heavy hauler displays the minimum power cylinder component life, while concrete mixer has the maximum life. Ultimately, this mathematical model will enable the engine manufactures to produce more cost effective components for different duty cycle applications, while fulfilling the customer requirements

Volume 1 – Symposium: Tuesday, March 8

Group A: Digital Hydraulics Group B: Intelligent Control Group C: Valves Group D | G | K: Fundamentals Group E | H | L: Mobile Hydraulics Group F | I: Pumps Group M: Hydraulic Components:Group A: Digital Hydraulics Group B: Intelligent Control Group C: Valves Group D | G | K: Fundamentals Group E | H | L: Mobile Hydraulics Group F | I: Pumps Group M: Hydraulic Component