Sanjay Kumar

Sanjay Kumar
University of Nebraska at Omaha | UN Omaha · Durham School of Architectural Engineering & Construction

PhD (IIT Kanpur)
Acoustics; Architectural Acoustics; Psychoacoustics; Acoustic Metamaterials

About

55
Publications
35,223
Reads
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572
Citations
Introduction
My research interests include Acoustic Metamaterials, sound Insulation, Sound wave manipulation, Point-of-care Diagnostics, Microfluidics, Numerical Modeling and simulations, Optimization, Statistical Modeling, etc.
Additional affiliations
April 2019 - January 2022
National University of Singapore
Position
  • Research Associate
January 2019 - March 2019
Indian Institute of Technology Kanpur
Position
  • Researcher
December 2013 - January 2019
Indian Institute of Technology Kanpur
Position
  • PhD
Description
  • Design and development of engineered functional materials for point-of-care diagnostics & Noise mitigation applications
Education
December 2013 - January 2019
Indian Institute of Technology Kanpur
Field of study
  • Acoustic Metamaterials
July 2010 - June 2012
Motilal Nehru National Institute of Technology Allahabad
Field of study
  • Mechanical Engineering (Production)
September 2005 - June 2010
R V S college of engineering and technology, Jamshedpur , India
Field of study
  • Engineering

Publications

Publications (55)
Article
Full-text available
The quest for a quiet environment has led to numerous efforts to shield noise at the source or develop an efficient acoustic proof system. We present a three-dimensional sonic crystal acoustic metacage structure for hybrid purposes of noise shielding and natural ventilation. The metacage prototype comprises sixteen cylindrical sonic crystal column...
Article
Full-text available
The aviation industry has seen dramatic growth over the decades till the recent disruption due to the COVID-19 pandemic. Moreover, long-haul routes with a distance of more than 4000 km are common for major airlines worldwide. Therefore, aircraft cabin noise assessment is essential, especially in long-haul flights, for passenger and flight crew heal...
Article
Full-text available
This study demonstrates a modular, compact, and lightweight sonic cage for sound mitigation applications. The design prototype utilized the principle of sonic crystals and has been composed of periodically arranged readily available aluminum extrusion T-slot columns. The preliminary design has demonstrated a sound insertion loss peak of 2.94 dB at...
Article
Full-text available
In this paper, the cabin noise of four airport express rail systems, namely the Taiwan Taoyuan International Airport MRT, the Hong Kong Airport Express, RER B service from Paris Gare du Nord to Paris Charles de Gaulle Airport, and the Shanghai Maglev, have been measured. These four airport express rail systems have different specifications and maxi...
Article
Full-text available
Modern apartments in major cities are usually made of lightweight structures with inadequate acoustic properties, leading to a growing number of noise complaints by residents of inadequate sound insulation in high-rise buildings. When a toilet is flushed, loud and irregular sounds like humming, gurgling, or bubbling, "explosive" fury from vacuum-as...
Article
Full-text available
A micro-perforated plate or panel (MPP) is a device used to absorb sound. It consists of a thin flat plate made from several different materials with small holes and a back cavity. Several reported modifications and enhancements to the original design of the MPP acoustic absorber were modified by the holes or the back-cavity shape and sizes followi...
Article
There is an increased concern about aircraft flypast noise, especially for residents living near an airport. Airlines typically fly at lower heights near the airports for taking off and landing. In this study, we measured the aircraft flypast noise near the Singapore Changi Airport, and the measurement locations were about 1.5 km away from the tip...
Preprint
Full-text available
The continuous surge of environmental noise levels has become a vital challenge for humanity. Earlier studies have reported that prolonged exposure to loud noise may cause auditory and non-auditory disorders. Therefore, there is a growing demand for suitable noise barriers. Herein, we have investigated several commercially available curtain fabrics...
Article
Full-text available
Vacuum cleaners are one of the most widely used household appliances associated with unpleasant noises. Previous studies have indicated the severity of loud vacuum cleaner noise and its impact on the users nearby. The standalone quantified measurements of the generated noise are not sufficient for properly characterizing vacuum cleaners. Human perc...
Article
Subways or rapid transit railways can be found in many major cities. These rapid transit railways are typically built above ground whenever possible to avoid the high capital cost of tunneling and also the high running cost of air conditioning and ventilation. However, noise from trains running on elevated tracks or viaducts close to residential an...
Article
Full-text available
The pandemic has impacted every facet of our life, society, and environment. It has also affected both the requirement and challenges for acoustic research and applications. The present article attempts to present a summary of the impact of COVID-19 on several aspects of acoustics, from the changes in the sonic environment due to reduced human and...
Article
Full-text available
In the unfortunate event of current ongoing pandemic COVID-19, where vaccination development is still in the trial phase, several preventive control measures such as social distancing, hand-hygiene, and personal protective equipment have been recommended by health professionals and organizations. Among them, the safe wearing of facemasks has played...
Article
Full-text available
We present thin acoustic meta-structures with subwavelength dimensions through which almost perfect sound absorption is achieved in the low-frequency domain. Our overall strategy builds on the fact that the sound absorption capabilities of the meta-structures primarily depend on the geometric dimensions and can easily be reconfigured as per require...
Preprint
Full-text available
In the unfortunate event of current ongoing pandemic COVID-19, where vaccination development is still at the initial stage, several preventive control measures such as social distancing, hand-hygiene, and personal protective equipment have been recommended by health professionals and organizations. Among them, the safe wearing of facemasks has play...
Preprint
Full-text available
Vacuum cleaners are one of the most widely used household appliances associated with unpleasant noises. Previous studies have indicated the severity of vacuum cleaner noise and its impact on the users nearby. The quantified measurements of the generated noise standalone are not sufficient for the selection or designing of vacuum cleaners. The human...
Preprint
Full-text available
The continuous increase of hospital noise levels has become a vital challenge for society. The complex soundscapes in the hospital produce unpleasant noise, which may exceed the prescribed noise level for the patients and healthcare professionals. Previous studies have reported that extended exposure to loud noise may cause auditory and non-auditor...
Article
Full-text available
In the past two decades, acoustic metamaterials have garnered much attention owing to their unique functional characteristics, which is difficult to be found in naturally available materials. The acoustic metamaterials have demonstrated to exhibit excellent acoustical characteristics that paved a new pathway for researchers to develop effective sol...
Article
Full-text available
In the past two decades, acoustic metamaterials have garnered much attention owing to their unique functional characteristics, which is difficult to be found in naturally available materials. The acoustic metamaterials have demonstrated to exhibit excellent acoustical characteristics that paved a new pathway for researchers to develop effective sol...
Data
See the supplementary material for detail description of geometrical designs of metastructures (Note 1) and the methods used in the simulation of ventilation performance of the samples (Note 2).
Article
Full-text available
There is a growing interest in the development of path coiling-based labyrinthine acoustic metamaterials for realizing extraordinary acoustical properties such as low- to-mid frequency sound absorption. We present a subwavelength labyrinthine acous- tic metastructure (≤ 3 cm) exhibiting a superior sound absorption with high band- width (more than o...
Preprint
Full-text available
Paper microfluidics is one of the rapidly growing technology and shown a tremendous caliber in the field of healthcare, biochemistry, environmental monitoring, analytical chemistry, etc. Owing to their distinct advantages such as rapid, easy-to-use, compatible with biological, organic and inorganic entities, chemical inertness, robustness, economic...
Article
Full-text available
Since its first demonstration of an acoustic metamaterial in the early 21 st century, it is widely used for sound wave manipulation purpose in many applications such as aerospace, automotive, defense, marine, etc. However, the traditional acoustic metamaterials display acoustic characteristics for restricted use because of their fixed structures. F...
Article
The unique characteristics like periodic and locally resonant behaviors of acoustic metamaterials result in an anomalous response to the wave propagation and exhibit complete elastic wave bandgaps. However, these unusual properties arise from the geometry of the artificially designed metastructure and can be significantly affected under the exposur...
Book
Full-text available
This volume provides an overview of the recent advances in the field of paper microfluidics, whose innumerable research domains have stimulated considerable efforts to the development of rapid, cost-effective and simplified point-of-care diagnostic systems. The book is divided into three parts viz. theoretical background of paper microfluidics, fab...
Article
Full-text available
The conflict between the acoustical performance and ventilation efficiency in conventional noise barriers limits their application potentials in several settings. To address this challenge, we design and experimentally demonstrate a ventilated tunable acoustic metamaterial for noise mitigation at targeted frequencies. Through the structure, a sound...
Chapter
Full-text available
Paper-based microfluidic systems have emerged as one of the most favorable technologies used in many potential applications such as point-of-care diagnostics, flexible electronics, energy storage, etc. From the past several decades, paper-based technology has readily accepted in the academic research lab and industries as well. The paper-based devi...
Chapter
Full-text available
Paper microfluidics is one of the rapidly growing technology and shown a tremendous caliber in the field of healthcare, biochemistry, environmental monitoring, analytical chemistry, etc. Owing to their distinct advantages such as rapid, easy-to-use, compatible with biological, organic and inorganic entities, chemical inertness, robustness, economic...
Conference Paper
Full-text available
Lightweight materials have often been used in transportation vehicles, giving rise to faster and more energy efficient vehicles. Apart from making the materials lighter and stronger, one consideration would be the improvement of the acoustic rating of the material. Effective use of sandwich panels can significantly increase the load bearing capacit...
Article
Full-text available
Owing to a steep rise in the urban population, there has been a continuous growth in construction of buildings, public or private transport like cars, motorbikes, trains, and planes at a global level. Hence, urban noise has become a major issue affecting the health and quality of human life. In the current environmental scenario, architectural acou...
Article
Full-text available
The recent success of additive manufacturing processes (also called, 3D printing) in the manufacturing sector has led to a shift in the focus from simple prototyping to real production-grade technology. The enhanced capabilities of 3D printing processes to build intricate geometric shapes with high precision and resolution have led to their increas...
Article
Full-text available
Fused filament fabrication (FFF) process is an emerging 3D printing technique primarily used for rapid prototyping in academic and industrial environments. The mechanical properties of these 3D-printed samples are highly anisotropic in nature and depend on various process parameters. Literature suggests that build orientation is a crucial parameter...
Patent
Full-text available
A composite panel assembly includes first and second elastic membranes and a structure. The structure has a first side mounted to the first elastic membrane and a second side mounted to the second elastic membrane. The structure includes a first honeycomb layer, a second honeycomb layer, and a plurality of necks. The first honeycomb layer has parti...
Conference Paper
Full-text available
A novel paper-based colorimetric sensor has been developed for ultrasensitive detection of heparin based on aggregation of positively charged silver nanoparticles. The electrostatic interaction between negatively charged heparin and positively charged silver nanoparticles (AgNPs) resulted in a shift in the surface plasmon resonance (SPR) wavelength...
Chapter
Full-text available
Nanofabrication has been a critical area of research in the last two decades and has found wide-ranging application in improvising material properties, sensitive clinical diagnostics, and detection, improving the efficiency of electron transport processes within materials, generating high energy densities leading to pulse power, novel therapeutic m...
Article
A structure consisting of a perforated plate backed by an air cavity is a widely used structure for sound absorption in the low-to-high frequency range. In this study, we propose a sound absorbing metastructure composed of a polydimethylsiloxane (PDMS)-based flexible perforated plate backed by a layer of multiple hexagonal unit cells. Each unit cel...
Thesis
Owing to their unique properties (size, shape, and surface functions), engineered functional materials are gaining significant attention in several domains like bio-sensing, noise mitigation, photonics, energy harvesting, water treatment and remediation, etc. On account of their lightweight and custom-building abilities, such materials may serve in...
Article
Dengue virus, a Flaviviridae family member, has emerged as a major worldwide health con-cern, making its early diagnosis imperative. Lateral flow immunoassays have been widely em-ployed for point-of-care diagnosis of dengue because of their rapid naked eye readouts, ease of use and cost-effectiveness. However, they entail a drawback of low sensitiv...
Conference Paper
Absorption of undesirable sound is a fundamental issue with broad applications in a variety of situations, such as in a conference room, cinema hall, aircraft cabin noise, etc. A variety of sound absorbers, e.g., micro-slit, concrete walls, porous media, etc., are used for noise control but are required to have a thickness comparable to the working...
Article
Full-text available
Acoustic metamaterials hold a great potential for attenuation of low frequency acoustic emissions. However, a fundamental challenge is achieving high transmission loss over a broad frequency range. In this work, we report a double negative acoustic metastructure for absorption of low frequency acoustic emissions in an aircraft. This is achieved by...
Chapter
Sensory systems are available today at all length scales and formulate an important mandate in sustainability of environment and health. They use a wide spectrum of transduction mechanisms and signal conversion approaches with different levels of accuracy and rapidity. Sensors as deployed in various ranges of applications span from relatively simpl...
Article
Full-text available
Herein we report the facile synthesis of a quaternary nanocomposite material (hemin-silver coated gold-graphene oxide) and evaluate its efficacy as a novel peroxidase mimetic. A strong synergistic coupling between the various components involved results in an excellent catalytic performance of this nanocomposite. A comparison done between the diffe...
Chapter
Full-text available
Surgical tools and implants are imperative in several medical fields like neurology, cardiology, orthopedics, dentistry, ophthalmology, etc. Surgical tools e.g. retractors, clamps, sutures, imaging devices, etc. assist the surgeon in various processes during a surgery. Medical implants are used as replacements to missing biological structures, supp...
Chapter
Full-text available
The 4i laboratory was set up in 2002 with the purpose of providing futuristic manufacturing solutions to the institute and the industry. Today, it intends to create a product-driven ecosystem that will boost the innovation and entrepreneurship culture within and outside the institute. This article provides a holistic overview of the laboratory in t...
Chapter
Microelectromechanical systems and micro-fluidics are two fast emerging domains in diagnostics research. The Microsystems technology emerged as a fall out of the microelectronics industry mostly due to the obsoleteness of some of the microelectronic processes owing to integration density issues. The area was first widely explored in the mechanical...
Article
Full-text available
A novel paper-based device for colorimetric detection of uric acid was developed based on the peroxidase-like activity of gold nanoparticles-graphene conjugates (AuNPs-GO). Theoretical models were utilized for designing of the device which were further verified by simulation and experimentation. Detection of uric acid was then carried out by initia...
Article
Full-text available
The laser trepan drilling (LTD) has proven to produce better quality holes in advanced materials as compared with laser percussion drilling (LPD). But due to thermal nature of LTD process, it is rarely possible to completely remove the undesirable effects such as recast layer, heat affected zone and micro cracks. In order to improve the hole qualit...

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Projects

Project (1)
Project
To develop a meta-structure for low-frequency noise attenuation.