Nabil G. Chalhoub

Wayne State University

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Naeim A. Henein

Wayne State University

G. A. Kfoury

Lawrence Technological University

Nassim Khaled

Ahram Canadian University

Walter Bryzik

Wayne State University

Faramarz Gordaninejad

University of Nevada, Reno

Valery N. Pilipchuk

Wayne State University

Hassan Nehme

Institut de Microélectronique, Electromagnétisme et Photonique

A. Ghazavi

University of Tehran

Constantine G. Mastory

Wayne State University

B. A. Bazzi

Wayne State University

Cooperative Institutions

Wayne State University

China Automotive Technology and Research Center

University of Michigan–Ann Arbor

United States Army

United States Department of the Army

Luleå University of Technology

University of Nevada, Reno

United States Army Combat Capabilities Development Command

University of Wisconsin–Madison

Michigan United

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Computation of the Instantaneous Frictional Losses of Internal Combustion Engine Components

G. A. Kfoury Nabil G. Chalhoub

An inverse dynamics scheme, based on a detailed differential-algebraic model of the crank-slider mechanism of a single cylinder internal combustion (IC) engine, is developed for the computation of the instantaneous frictional losses of engine components. The proposed approach requires accurate measurements of the independent and superfluous coordinates of the crank-slider mechanism as well as their time derivatives. This was achieved by implementing a sliding mode observer, previously developed by the authors, to provide the required estimates of the state variables. The aforementioned observer is suitable for use with differential-algebraic nonlinear equations of motion and was shown to be robust to both modeling imprecision and external disturbances. The digital simulation results show the capability of the combined inverse dynamics scheme with the observer in producing good estimates of the instantaneous frictional losses of the various engine components.

Observer (physics)

Crank

10.1115/dscc2010-4266

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Citations (1)

Development of a Robust Nonlinear Observer for a Single-Link Flexible Manipulator

Nabil G. Chalhoub G. A. Kfoury

Accurate measurements of all the state variables of a given system are often not available due to the high cost of sensors, the lack of space to mount the transducers or the hostile environment in which the sensors must be located. The purpose of this study is to design a robust sliding mode observer that is capable of accurately estimating the state variables of the system in the presence of disturbances and model uncertainties. It should be emphasized that the proposed observer design can handle state equations expressed in the general form. The performance of the nonlinear observer is assessed herein by examining its capability of predicting the rigid and flexible motions of a compliant beam that is connected to a revolute joint. The simulation results demonstrate the ability of the observer in accurately estimating the state variables of the system in the presence of structured uncertainties and under different initial conditions between the observer and the plant. Moreover, they illustrate the deterioration in the performance of the observer when subjected to unstructured uncertainties of the system. Furthermore, the nonlinear observer was successfully implemented to provide on-line estimates of the state variables for two model-based controllers. The simulation results show minimal deterioration in the closed-loop response of the system stemming from the usage of estimated rather than exact state variables in the computation of the control signals.

Observer (physics)

State variable

Revolute joint

Alpha beta filter

10.1115/imece2004-59790

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Simulation of a Single Cylinder Diesel Engine Under Cold Start Conditions Using Simulink

Journal of Engineering for Gas Turbines and Power (2000)

H.-Q. Liu Nabil G. Chalhoub Naeim A. Henein

A nonlinear dynamic model is developed in this study to simulate the overall performance of a naturally aspirated, single cylinder, four-stroke, direct injection diesel engine under cold start and fully warmed-up conditions. The model considers the filling and emptying processes of the cylinder, blowby, intake, and exhaust manifolds. A single zone combustion model is implemented and the heat transfer in the cylinder, intake, and exhaust manifolds are accounted for. Moreover, the derivations include the dynamics of the crank-slider mechanism and employ an empirical model to estimate the instantaneous frictional losses in different engine components. The formulation is coded in modular form whereby each module, which represents a single process in the engine, is introduced as a single block in an overall Simulink engine model. The numerical accuracy of the Simulink model is verified by comparing its results to those generated by integrating the engine formulation using IMSL stiff integration routines. The engine model is validated by the close match between the predicted and measured cylinder gas pressure and engine instantaneous speed under motoring, steady-state, and transient cold start operating conditions.

Transient (computer programming)

Crank

Four-stroke engine

Cylinder block

10.1115/1.1290148

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Citations (30)

Control of dumbbell satellite orbits using moving mass actuators

Nonlinear Dynamics (2022)

Valery N. Pilipchuk Steven W. Shaw Nabil G. Chalhoub

Dumbbell

Orbital inclination

Orbit (dynamics)

Circular orbit

Orbital maneuver

Elliptic orbit

Orbital mechanics

10.1007/s11071-022-07705-y

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Dynamics and control of a two-ship ensemble connected by a massless towline

Ocean Engineering (2021)

Mohamad M. Ismail Nabil G. Chalhoub Valery N. Pilipchuk

Towing

Robustness

10.1016/j.oceaneng.2021.109295

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Citations (6)

Integration and Use of Diesel Engine, Driveline and Vehicle Dynamics Models for Heavy Duty Truck Simulation

SAE technical papers on CD-ROM/SAE technical paper series (1999)

Dennis N. Assanis Walter Bryzik Nabil G. Chalhoub Zoran Filipi Naeim A. Henein

Powertrain

Heavy duty

10.4271/1999-01-0970

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Citations (25)

Development of a Dynamic Model for Predicting the Rigid and Flexible Motions of the Crank Slider Mechanism

Journal of Engineering for Gas Turbines and Power (1998)

Hassan Nehme Nabil G. Chalhoub Naeim A. Henein

A continuous model is developed to predict the rigid and flexible motions of the piston assembly/connecting rod/crankshaft mechanism for a single cylinder engine. The model accounts for the torsional vibration and the out-of-plane transverse deformation of the crankshaft along with the out-of-plane transverse deformation of the connecting rod. The eigenvalue problem of the crankshaft, including the counterweights, the flywheel, and the crank gear, is solved to obtain the analytical expressions for the elastic modes of the crankshaft. The resulting mode shapes are then used in the assumed modes method to approximate the structural flexibility terms. The differential-algebraic equations of motion are obtained by implementing the Lagrange principle. The digital simulation results illustrate the role played by the topological nonlinearities inherent in the system and reveal the relationships with which the rigid and flexible motions of the crank-slider mechanism would interact.

Crank

Flywheel

10.1115/1.2818199

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Citations (4)

Adaptation of Advanced Diesel Engines for Military Requirements Under Severe Environmental Conditions

Naeim A. Henein Dinu Taraza Nabil G. Chalhoub

Abstract : The overall goal of this program is to adapt commercially produced heavy duty diesel engines to meet the goals the military engines for maximum power, better fuel economy, and low signature in the field by white or black smoke and compactness for mobility. The commercial advanced heavy-duty diesel engines are produced to meet stringent emission standards, causing penalties in peak power and fuel economy. This project addressed three major thrust areas. The first area is to determine the effect of replacing the commercially available fuel with JP8 fuel. The second area is to examine the different control strategies used in advanced diesel engines to meet the emission goals and their effect on engine performance, fuel economy and exhaust emissions. This requires a basic understanding of the different strategies used in the commercial vehicles to meet the emission standards and to develop new strategies to optimize the fuel economy and maximize the power density without exceeding the low smoke limits allowable in the field. The third area is a fundamental investigation on the lubrication of the main engine bearings. Four codes have been developed in Matlab to calculate the loading of the engine main bearings and, determine the journal orbit and the oil film thickness.

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Computer-Based Adaptation Tool for Advanced Diesel Engines Used in Military Applications

Naeim A. Henein Dinu Taraza Nabil G. Chalhoub

Abstract : The main goal of the project was the development a computer code capable to simulate the operation of a multi-cylinder common rail diesel engine. The code should be used in investigating the possibilities of a commercial engine to be adapted for military applications by increasing the engine output while reducing fuel consumption and assure safe operation of the engine. In the process of developing the simulation model and the corresponding computer code, the critical loading of the engine bearings and the piston assembly were determined by developing detailed models for loading and stresses in the bearings and the piston. Experimental setups were developed to validate the models. To correctly estimate the fuel consumption, a detailed friction simulation model has been developed. Both experimental and analytical investigations were conducted to allow better estimation of the ignition delay, combustion and emissions. The Computer based Adaptation Tool has been built in a modular form in the Matlab-SIMULINK platform. The advantage of this configuration resides in the fact that modules could be replaced as new modules are developed, for example the ignition delay and the combustion modules for different fuels that could be used by the diesel engine. Finally the Computer Based Adaptation Tool has been validated by experiments conducted on a 2.5 liters common rail diesel engine both for steady state operation and for engine transients.

10.21236/ada499394

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Dynamic simulation of a flexible robot arm and controller

Deep Blue (University of Michigan) (1983)

Nabil G. Chalhoub A. Galip Ulsoy

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