Date of Award

Fall 2004

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical & Aerospace Engineering

Program/Concentration

Mechanical Engineering

Committee Director

J. K. Huang

Committee Director

S. Bawab

Committee Member

S. K. Chaturvedi

Call Number for Print

Special Collections; LD4331.E56 K68 2004

Abstract

In the present day market it has been demonstrated that quality and speed make a product successful. An automobile has hundreds of components, which work in synchronization to make the automobile run smoothly. The fuel injector is one of the key components of an automobile. The primary functions of a fuel injector are: to deliver measured quantity of fuel to the engine, to atomize fuel for efficient combustion process, to deliver measured or atomized quantity of fuel to the desired target within manifold/head, and to shut off the fuel supply when no fuel is required. When this fuel injector is at work, it produces a noise known as injector acoustical noise. Acoustical noise, sometimes described as a ticking sound, is generated by the opening and/or closing of the fuel shut off valve within the injector. The quality of a fuel injector can be determined by analyzing the sound characteristics of the injector. In order to have a fuel injector with a high quality, it is essential to keep the injector acoustical noise at low levels.

In order to reduce the injector acoustic noise, it is essential to investigate the root cause of the difference in sound characteristics of the injector design. The approach followed was to perform modal analysis of the fuel injector and validate with a laser vibrometer measurement and correlate with sound measurement results. In this thesis, a finite element model is developed using Ansys 8.0. Modal analysis was performed to determine the modes of vibration and natural frequencies of the fuel injector. Modal analysis data was validated with the physical testing. The model developed can be further used to investigate the root cause of the difference in sound characteristics.

Process modeling of a complicated injector was divided into two parts. At first, the modal analysis of the fuel module was performed using Ansys software and the modes of vibration & natural frequencies were determined. Using a laser vibrometer, the physical testing of the fuel module was performed and the natural frequencies were determined and compared with the simulation data and validated.

Based on analysis and experimentation of the fuel module, a finite element model of the whole injector was developed. The modal analysis of the injector model was performed and the modes of vibration and natural frequencies were determined. The frequency values obtained were compared and validated with the values of the physical testing.

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DOI

10.25777/3w72-k752

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