Acoustics and Ultrasonics, Multidisciplinary, Mechanical Engineering
6
Scopus Publications
50
Scholar Citations
3
Scholar h-index
2
Scholar i10-index
Scopus Publications
Recent progress in programmable acoustic metamaterials and their principles: A review Sanjeet Kumar Singh, Shantanu Bhattacharya Journal of Micromanufacturing, 2025 Programmable acoustic metamaterials allow to manipulate sound waves at desirable frequency ranges intelligently, which makes it a viable and practical alternative to many noise cancellation applications. These kinds of metamaterials are amenable to intelligent programming and find place in a variety of real-life applications such as acoustic cloaking, noise cancellation, stealth applications, noise focusing, etc., simply with intelligent programming of the microstructure and the control of micro-movement of the various control boundaries instead of rebuilding new structures every time. Metamaterials are artificially designed materials that possess unique, unusual physical and mechanical properties, making them good lightweight candidates for various noise-shielding applications. However, many papers have been published on studying passive kinds of metamaterial structures whose material properties are fixed in space and time once designed and fabricated. This article is about a different class of metamaterials which are programmable and changeable through various control boundaries forming the structures for the applications pertaining to acoustic isolation (vibro-acoustics) and acoustic mitigation. The incorporation of shape memory polymers or smart polymers into the metamaterial structures enables fine and coarse tuning of these structures to the incoming noise frequency spectrum on a real-time basis. This article reviews some recent trends in progress made with smart materials and programmable metamaterials, their various programming techniques, the fundamental concept involved, various design strategies of such materials and their emergent applications in various fields of technology. The current fabrication challenges and future outlook in this promising field are also discussed.
Hybrid fractal acoustic metamaterials for low-frequency sound absorber based on cross mixed micro-perforated panel mounted over the fractals structure cavity Sanjeet Kumar Singh, Om Prakash, Shantanu Bhattacharya Scientific Reports, 2022 The proposed work enumerates a hybrid thin, deep-subwavelength (2 cm) acoustic metamaterials acting as a completely new type of sound absorber, showing multiple broadband sound absorption effects. Based on the fractal distribution of Helmholtz resonator (HRs) structures, integrated with careful design and construct hybrid cross micro-perforated panel (CMPP) that demonstrate broad banding approximately one-octave low-frequency sound absorption behavior. To determine the sound absorption coefficient of this novel type of metamaterial, the equivalent impedance model for the fractal cavity and the micro-perforated Maa’s model for CMPP are both used. We validate these novel material designs through numerical, theoretical, and experimental data. It is demonstrated that the material design possesses superior sound absorption which is primarily due to the frictional losses of the structure imposed on acoustic wave energy. The peaks of different sound absorption phenomena show tunability by adjusting the geometric parameters of the fractal structures like cavity thickness ‘t’, cross perforation diameter of micro perforated panel, etc. The fractal structures and their perforation panel are optimized dimensionally for maximum broadband sound absorption which is estimated numerically. This new kind of fractals cavity integrated with CMPP acoustic metamaterial has many applications as in multiple functional materials with broad-band absorption behavior etc.
SHAPE MEMORY POLYMERS AND THEIR EMERGING APPLICATIONS Sanjeet Kumar Singh, Rishi Kant, Shantanu Bhattacharya Trends in Applications of Polymers and Polymer Composites, 2022 Shape-memory polymers (SMP) are a class of materials that are better known as smart materials. The smartness of the SMP comes from their tunability properties allowing them to tweak into various shapes and orientations as per the desired applications. Many animals can change the stiffness of their skin, adopt the colors from the environment, change their appearance according to needs and in case of approaching danger, etc. Inspired by these above natural phenomena, many smart materials have been developed by researchers over the last decade and SMP is one of them. SMP polymers can easily be manipulated to the desired shape by changing their physical and chemical parameters such as temperature, light, ultrasound, chemical cross-linkage, crystallization, etc. SMP is a suitable candidate for designing novel metamaterials or programmable metamaterials in which the temporary shape can be retained and also imposed and controlled through programming such that the initial shape of the material can be recovered by an application of an external stimulus. The best characteristic of these polymers is the retain-ability of original or temporary shape in different stimuli fields prompting this material to have a memory effect for shape retainability. Due to such exceptional properties of the SMP, these smart materials find wide applications in Aerospace, Biomedical micro-devices, Robotics, Acoustics, Electronics, Textiles, Bionics engineering, and many other contemporary fields.This chapter discusses some fundamentals related to the fabrication strategies, emerging application aspects, and memory retention/ programming aspects of the shape memory polymers. The current state of the art and future directions has also been outlined to provide a roadmap for smart memory polymers-based technologies.
Novel fractal acoustic metamaterials (FAMs) for multiple narrow-band near-perfect absorption Sanjeet Kumar Singh, Om Prakash, Shantanu Bhattacharya Journal of Applied Physics, 2022 In this work, we introduce fractal acoustic metamaterials (FAMs), in thicknesses ranging from 5 (λ/69) to 25 mm (λ/18), which are observed to provide multiple narrow-band low-frequency absorptions of acoustic signals. The fractal structures used in this work are carefully designed and fabricated using a side branch Helmholtz resonator design, making these structures easily tunable to multiple frequencies. Using different sizes of the side branches distributed in a fractally oriented configuration onto a plane rigid baseplate, the propagation velocity of acoustic waves is slowed down considerably. There is also a shifting resonating response of the structures toward lower frequencies (<1600 Hz). These FAM structures exhibit no dependence on the acoustic traverse length, as is otherwise commonly seen in coiled meta-structures and others. In order to achieve a near-perfect sound absorption behavior, the geometry of the structure is theoretically ascertained and validated numerically and experimentally. Significant emphasis has been placed on the associated physical mechanism modulating the loss of intensity of the incident acoustic signals. Moreover, with regression analysis performed on a response surface-based optimization scheme (using Design Expert 11 software), the geometric parameters are determined in a way that the absorption demonstrates a narrow-band characteristic at a frequency of 1 K Hz. We have shown in this work the tunability aspect of the various absorption frequency bands through appropriate designs of the FAM. It opens up wide application possibilities of multiple frequency sound absorptions (acoustic cloaking).
Flat Fresnel-Spiral Acoustic Metamaterials Composed of Several Arms Ventilated Metamaterials for Simultaneous Broadband Sound Absorption and Air Circulation Internoise 2022 51st International Congress and Exposition on Noise Control Engineering, 2022
Ashok chakra-structured meta-structure as a perfect sound absorber for broadband low-frequency sound Shantanu Bhattacharya, Sanjay Kumar, Sanjeet Kumar Singh, Pulak Bhushan, Megha Sahu, Om Prakash Applied Physics Letters, 2020 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 requirements through a change of geometry. To analyze various possibilities, we optimize the geometric structure through hybrid regression analysis using the genetic algorithm approach and finite element-based numerical simulations so that the geometry is tuned for high attenuation of acoustic signals over a broad range of frequencies. Both theoretical and experimental data show good parity and are able to establish the meta-structure nature of the assembly with respect to different frequency bands in the low frequency domain.
RECENT SCHOLAR PUBLICATIONS
Design and development of one-dimensional acoustic bundle ventilated metamaterial OPSB Sanjeet Kumar Singh Acta Acustica , 2026 2026
Recent progress in programmable acoustic metamaterials and their principles: A review SK Singh, S Bhattacharya Journal of Micromanufacturing, 25165984251379272 , 2025 2025
Smartphone/Tablet stand with adjustable height and angle cum accessories storage box: Closed view SG Sanjeet Kumar Singh IN Patent 369740-001 , 2024 2024
Helmholtz metamaterial noise blocker: a novel material for acoustic insulation DSB Dr. Sanjeet Kumar Singh IN Patent 395885-001 , 2024 2024
Measuring Devices for measuring a path and method thereof SN Sanjeet Kumar Singh, Saurabh Gupta, Vishwaraj Shrivastava IN Patent 547,807 , 2024 2024
Design Of aesthetic acoustic metamaterials window panel based on Sierpiński triangle for sound-silencing with free airflow SK Singh, S Bhattacharya The Journal of the Acoustical Society of America 154 (4_supplement), A155-A155 , 2023 2023
Smartphone/Tablet holder cum storage box sanjeet kumar Singh, S Gupta IN Patent 369741-001 , 2023 2023
Reusable drinking straw cum portable multipurpose cutlery set Inbox sanjeet kumar singh saurabh gupta, Dr. Syam Nair, Vaishali Jain IN Patent 467,712 , 2023 2023
Bookshelf and Chair in One SK Singh IN Patent 357518-001 , 2023 2023
Sound Amplifier and Reflector for Smart Phones sanjeet kumar singh, saurabh gupta IN Patent 356893-001 , 2023 2023
Flat Fresnel-spiral acoustic metamaterials composed of several arms ventilated metamaterials for simultaneous broadband sound absorption and air circulation S singh, S Bhattachrya INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265 (7), 408-416 , 2023 2023
Helmholtz metamaterial noise blocker: a novel material for acoustic insulation SB Sanjeet Kumar Singh IN Patent 395885-001 , 2023 2023
Hybrid fractal acoustic metamaterials for low-frequency sound absorber based on cross mixed micro-perforated panel mounted over the fractals structure cavity SK Singh, O Prakash, S Bhattacharya Scientific Reports 12 (1), 20444 , 2022 2022 Citations: 28
Novel fractal acoustic metamaterials (FAMs) for multiple narrow-band near-perfect absorption SK Singh, O Prakash, S Bhattacharya Journal of Applied Physics 132 (3) , 2022 2022 Citations: 9
Three-dimensional adjustable video recording setup for smartphones Sanjeet Kumar Singh,Saurabh Gupta,Dr. Syam Nair, Dr. Shantanu Bhattacharya IN Patent 107,058 , 2022 2022
Reusable drinking steel straw cum portable hiking cutlery set Sanjeet kumar singh, Saurabh gupta, Vaishali Jain IN Patent 343134-001 , 2022 2022
Shape memory polymers and their emerging applications SK Singh, R Kant, S Bhattacharya Trends in Applications of Polymers; Patel, VK, Bhattacharya, S., Kant, R … , 2022 2022 Citations: 3
Ashok chakra-structured meta-structure as a perfect sound absorber for broadband low-frequency sound S Bhattacharya, S Kumar, SK Singh, P Bhushan, M Sahu, O Prakash Applied Physics Letters 117 (19) , 2020 2020 Citations: 10
Role of novel microRNAs in non-small cell lung cancer progression using lung tissues A Singh, M Ali, V Prakash, R Kant, SK Singh CANCER MEDICINE 7, 28-29 , 2018 2018
MOST CITED SCHOLAR PUBLICATIONS
Hybrid fractal acoustic metamaterials for low-frequency sound absorber based on cross mixed micro-perforated panel mounted over the fractals structure cavity SK Singh, O Prakash, S Bhattacharya Scientific Reports 12 (1), 20444 , 2022 2022 Citations: 28
Ashok chakra-structured meta-structure as a perfect sound absorber for broadband low-frequency sound S Bhattacharya, S Kumar, SK Singh, P Bhushan, M Sahu, O Prakash Applied Physics Letters 117 (19) , 2020 2020 Citations: 10
Novel fractal acoustic metamaterials (FAMs) for multiple narrow-band near-perfect absorption SK Singh, O Prakash, S Bhattacharya Journal of Applied Physics 132 (3) , 2022 2022 Citations: 9
Shape memory polymers and their emerging applications SK Singh, R Kant, S Bhattacharya Trends in Applications of Polymers; Patel, VK, Bhattacharya, S., Kant, R … , 2022 2022 Citations: 3
Design and development of one-dimensional acoustic bundle ventilated metamaterial OPSB Sanjeet Kumar Singh Acta Acustica , 2026 2026
Recent progress in programmable acoustic metamaterials and their principles: A review SK Singh, S Bhattacharya Journal of Micromanufacturing, 25165984251379272 , 2025 2025
Smartphone/Tablet stand with adjustable height and angle cum accessories storage box: Closed view SG Sanjeet Kumar Singh IN Patent 369740-001 , 2024 2024
Helmholtz metamaterial noise blocker: a novel material for acoustic insulation DSB Dr. Sanjeet Kumar Singh IN Patent 395885-001 , 2024 2024
Measuring Devices for measuring a path and method thereof SN Sanjeet Kumar Singh, Saurabh Gupta, Vishwaraj Shrivastava IN Patent 547,807 , 2024 2024
Design Of aesthetic acoustic metamaterials window panel based on Sierpiński triangle for sound-silencing with free airflow SK Singh, S Bhattacharya The Journal of the Acoustical Society of America 154 (4_supplement), A155-A155 , 2023 2023
Smartphone/Tablet holder cum storage box sanjeet kumar Singh, S Gupta IN Patent 369741-001 , 2023 2023
Reusable drinking straw cum portable multipurpose cutlery set Inbox sanjeet kumar singh saurabh gupta, Dr. Syam Nair, Vaishali Jain IN Patent 467,712 , 2023 2023
Bookshelf and Chair in One SK Singh IN Patent 357518-001 , 2023 2023
Sound Amplifier and Reflector for Smart Phones sanjeet kumar singh, saurabh gupta IN Patent 356893-001 , 2023 2023
Flat Fresnel-spiral acoustic metamaterials composed of several arms ventilated metamaterials for simultaneous broadband sound absorption and air circulation S singh, S Bhattachrya INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265 (7), 408-416 , 2023 2023
Helmholtz metamaterial noise blocker: a novel material for acoustic insulation SB Sanjeet Kumar Singh IN Patent 395885-001 , 2023 2023
Three-dimensional adjustable video recording setup for smartphones Sanjeet Kumar Singh,Saurabh Gupta,Dr. Syam Nair, Dr. Shantanu Bhattacharya IN Patent 107,058 , 2022 2022
Reusable drinking steel straw cum portable hiking cutlery set Sanjeet kumar singh, Saurabh gupta, Vaishali Jain IN Patent 343134-001 , 2022 2022
Role of novel microRNAs in non-small cell lung cancer progression using lung tissues A Singh, M Ali, V Prakash, R Kant, SK Singh CANCER MEDICINE 7, 28-29 , 2018 2018
