Abhijit Gupta

Abhijit Gupta
Northern Illinois University · Department of Mechanical Engineering

PhD, PE

About

16
Publications
3,802
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407
Citations

Publications

Publications (16)
Article
Accelerated testing involves testing a product at a level higher than the normal usage level. This is important because test time and expenditure for testing can be greatly reduced by accelerated testing. This study involves aluminum beams (bare as well as coated with sprayable damping material) subjected to random vibration. Since most materials f...
Article
Full-text available
Damping materials are used extensively for reduction of vibration and noise. These damping materials have viscoelastic characteristics and are used by automotive and other industries. Testing of these materials is important in order to predict their performance and traditionally the damping properties are measured by the Oberst method. This paper d...
Conference Paper
Full-text available
This paper analyzes and optimizes narrowband active noise control systems using multiple second-order adaptive filters. Theoretical analysis of the overall parallel structure is based on autocorrelation and cross-correlation matrices. Analytical result shows the use of single error signal to update all adaptive filters with different input signals...
Article
Full-text available
Traditional assessments including examinations are most common or traditional form of assessment. At times these are replaced or supplemented by performance tests not only as an alternative means of assessment, but also for improvement of student learning and performance. This paper presents a study designed to examine three questions. The first qu...
Article
This paper presents several broadband active sound quality control algorithms based on delayless frequency-domain techniques and subband adaptive filters. This efficient algorithm provides faster convergence and reduced computational complexity as compared to a time-domain active noise equalizer. An equal-loudness compensation method is also introd...
Article
This paper presents an application of active noise control (ANC) algorithms for reducing snoring noise. The snore ANC system installed on a traditional headboard has potential benefits of retrofitting, convenience, and being unobtrusive. ANC algorithms in both single-channel and multiple-channel structures have been developed and tested to evaluate...
Article
This paper presents a new method for finite element matrix updating problem in an undamped model. This method has a computationally convenient feature of handling the difficulty of the incomplete measured data in an algorithmic way without using standard modal expansion or reduction techniques. The completed eigenvector matrix is such that it is ma...
Article
Natural frequencies and mode shapes of a structure change whenever a structure has any kind of damage. However, detection of location and magnitude of damage has always been difficult. This paper presents a technique to locate and quantify the damage when the natural frequencies and mode shapes of undamaged and damaged structure are known. First, t...
Article
This paper develops an active sound-quality control (ASQC) system based on the active noise equalization (ANE) technique, and optimizes it with the filtered-error least mean square (FELMS) algorithm and normalized reference signal generator. The ASQC system controls the sound quality of products such as engines by changing the amplitudes of harmoni...
Article
Automobiles and trucks have shock absorbers to damp out the vibration experienced due to roughness of the roads. However, energy in conventional shock absorbers gets dissipated as heat and is not used in any way. Regenerative electromagnetic shock absorbers provide a means for recovering the energy dissipated in shock absorbers. Two configurations...
Conference Paper
Natural frequencies and mode shapes of a structure will change whenever the structure has any kind of damage. This paper introduces a technique to quantify and locate the damage when the natural frequencies and mode shapes of undamaged and damaged structure are known. Aluminum beams (with and without damage) are used for numerical simulation and ex...
Article
We extend the dynamic absorption property to a multi-degree of freedom system, which consists of a damped primary sub-system. The harmonic excitation is composed of several frequencies.
Article
Fatigue life of aluminum beams subjected to random vibrations while mounted on a shaker are evaluated. Finite element technique is used to obtain stress psd at critical location due to the prescribed acceleration psd. Various theories are used to estimate the fatigue life corresponding to the calculated stress psd. Theoretical values from various t...
Article
Often, the dynamic elastic modulus of a material with frequency dependent properties is difficult to estimate. These uncertainties are compounded in any structural vibration analysis using the material properties. Here, different experimental techniques are used to estimate the properties of a particular elastomeric material over a broad frequency...
Article
Analysis of thin axisymmetric shells by means of finite elements based on cubic B-splines is described. The elements are isoparametric, i.e. both geometry and displacements are described by cubic B-splines. At the interior nodes of the meridian, the degrees of freedom are two nodal displacements. Three degrees of freedom are used at the edge nodes:...
Article
Essential Tremor is the most common form of patholog-ical tremor and is a major source of functional disability, affecting many of the daily living tasks. Essential tremor appears usually after the fourth decade and is slowly progressive. This paper is related to the active vibration control of the tremor of hand. Active vibration control has been...

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