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Journal articles on the topic 'Low and high frequency floor'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Tigli, Omer, and Mohammad Royvaran. "Vibration Isolation with Spring Supported Concrete Floating Floors on Fitness Centers." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 266, no. 2 (2023): 603–14. http://dx.doi.org/10.3397/nc_2023_0090.

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Spring-supported concrete floating floors are often used as a high-end solution to mitigate noise and vibration disturbances in fitness centers. Suppliers of these floors typically provide impressive sound test results, but information regarding their low-frequency vibration isolation capabilities is scarce. In this study, the authors collected in-situ vibration data from an existing fitness center equipped with a 4-in (102-mm) thick spring-supported concrete floating floor while conducting various activities such as running on a treadmill, dropping a dumbbell, putting down a barbell and slamm

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2

Huo, Runke, Shuguang Li, Zhanping Song, et al. "Analysis of Vibration Response Law of Multistory Building under Tunnel Blasting Loads." Advances in Civil Engineering 2019 (February 17, 2019): 1–16. http://dx.doi.org/10.1155/2019/4203137.

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This paper takes the Dizong tunnel engineering as its background. Combined with the on-site monitoring data, the wavelet packet program based on MATLAB was compiled to study the vibration response of the four-story masonry building in a typical southwestern mountainous area of China under the blasting load. The results showed that the maximum particle velocity increased to the 3rd floor and attenuation occurred on the 4th floor. The particle velocity in the z-direction was the largest and should be paid attention. The dominant frequency of the building showed a trend from high frequency to low

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3

Qin, Yi, Jin Jack Tan, and Maarten Hornikx. "Experimental investigation of the low-frequency impact sound transfer function of lightweight wooden floors via heel drops." Acta Acustica 4, no. 6 (2020): 23. http://dx.doi.org/10.1051/aacus/2020022.

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The lightweight floor is a popular construction choice in buildings despite its poor low-frequency impact sound performance. This is exacerbated by common human activities, such as walking and jumping, that have high input force levels at low frequencies. Therefore, experimental evaluations of the low-frequency impact sound performance of a wooden lightweight floor are of interest to designers and researchers. The aim of this paper is to explore the use of heel drop for impact sound transfer measurement. An impact force plate has been built to accurately measure the heel-drop forces up to 200

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Xiao, Bo, Ya Liu, Xiaohui Li, Zhifeng Deng, and Yanrong Xue. "High-Resolution Multi-Channel Frequency Standard Comparator Using Digital Frequency Measurement." Sensors 21, no. 16 (2021): 5626. http://dx.doi.org/10.3390/s21165626.

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The rapid improvement accuracy of the atomic frequency standard puts forward higher requirements for the measurement resolution of the atomic frequency standard comparison system. To overcome the defect that the single zero-crossing point detection is sensitive to noise in the traditional dual mixer time difference measurement method, a digital frequency measurement method is proposed. This method combines sinusoidal beat technology, multi-channel synchronous acquisition technology, and digital frequency measurement technology, and uses differential compensation of system error to realize the

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5

HOLøYEN, Gjermund V. "Extending the frequency range of ISO 717-2 - a look at options and issues." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 270, no. 2 (2024): 9195–202. http://dx.doi.org/10.3397/in_2024_4205.

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In 2019, the Norwegian Standard NS 8175, which defines requirements for sound insulation in Norwegian buildings, was revised to include low frequency spectrum adaption terms for new dwellings. This change affects the applicability of measurements of weighted improvement of impact sound insulation, delta Lw, as the spectrum for calculating delta Lw, given in ISO 717-2, is limited downwards to 100 Hz. For a floating floor construction, this means that floors with a resonance frequency well below 100 Hz, and correspondingly a relatively high delta Lw, will be overrated in the sense that the measu

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Girdhar, Sunit, Jason Blough, Andrew Barnard, John LoVerde, and Wayland Dong. "Measuring the impact force from the ISO impact ball and comparison with the tapping machine and alternate input method." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 7 (2023): 452–61. http://dx.doi.org/10.3397/in_2022_0065.

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The impact ball was recently standardized within the ISO standards as a low-frequency input impact source for impact testing of floor-ceiling assemblies. The input force due to an impact ball is not measured during the tests. A force measurement plate was created with three force transducers to measure the impact force due to ball drops on six different floor assemblies. The input force showed a really good comparison for heavy and lightweight floors in lower frequency but poor force excitation for all the floors above 100 Hz. The input force values were compared with a modified tapping machin

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7

Zhou, Jianhui, and Mohammad Hossein A. Jafari. "Impact sound insulation performance of mass timber floors." Journal of the Acoustical Society of America 155, no. 3_Supplement (2024): A241. http://dx.doi.org/10.1121/10.0027362.

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Mass timber floors are being used increasingly in both mass timber and hybrid timber buildings due to its dry and rapid construction. Bare mass timber structural slabs have relatively low impact sound insulation performance. Though certain floating floor assemblies on mass timber slabs can provide adequate single number ratings, such assemblies are mainly effective in the middle to high frequency range. This paper will provide an overview of the research on the impact sound insulation perforamnce of mass timber floors with exposed ceiling and floating floor assembies conducted at the Universti

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8

Farhad, Abbas Gandomkar, and Danesh Mona. "Comfort Level Investigation of Chromite Composite Floor System under Human Walking Load." Journal of Civil Engineering and Materials Application 4, no. 3 (2020): 161–77. https://doi.org/10.22034/jcema.2020.241135.1033.

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This paper's main objective is to determine the comfortableness of a composite structural floor system known as Chromite. For this purpose, twenty-eight Chromite panels were developed via the Finite Element Method (FEM) to find their Fundamental Natural Frequency (FNF). Then, the studied panels are categorized as Low-Frequency Floor (LFF) or High-Frequency Floor (HFF) regarding to their FNFs. Peak accelerations of low and high-frequency panels and also static stiffness of high-frequency panels were determined and compared with the limit value affirmed by the American Institute of Steel and

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9

Bader Eddin, Mohamad, Sylvain Ménard, Delphine Bard Hagberg, Jean-Luc Kouyoumji, and Nikolaos-Georgios Vardaxis. "Prediction of Sound Insulation Using Artificial Neural Networks—Part I: Lightweight Wooden Floor Structures." Acoustics 4, no. 1 (2022): 203–26. http://dx.doi.org/10.3390/acoustics4010013.

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The artificial neural networks approach is applied to estimate the acoustic performance for airborne and impact sound insulation curves of different lightweight wooden floors. The prediction model is developed based on 252 standardized laboratory measurement curves in one-third octave bands (50–5000 Hz). Physical and geometric characteristics of each floor structure (materials, thickness, density, dimensions, mass and more) are utilized as network parameters. The predictive capability is satisfactory, and the model can estimate airborne sound better than impact sound cases especially in the mi

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10

Hammer, P., and J. Brunskog. "Vibration Isolation on Lightweight Floor Structures." Building Acoustics 9, no. 4 (2002): 257–69. http://dx.doi.org/10.1260/135101002320941431.

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A theoretical and experimental study of vibration isolation for a source on a lightweight floor structure is presented. The effectiveness of one-stage and two-stage isolator systems is studied. Approximate formulae are presented for both low and high frequency for the receiver, the floor structure. For the mobility, a comparison between approximate formulae, numerical exact results and experimental results are presented. The low frequency asymptote for the approximate mobility is valid up to l/λp ≈ 1/4. The high frequency asymptote is valid from l/λp ≈ 1/2. A straight line can be drawn between

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11

Ge, Hai Jie, Hui Wang, and Dong Qi Gao. "Research on Seismic Isolated Floor Slab with Damper and Rolling Base." Applied Mechanics and Materials 105-107 (September 2011): 429–35. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.429.

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Earthquake is one of the major threats towards building and non-building structure and various seismic isolation technologies have gained a good development all-round the world. Based on such a condition, a new form of seismic isolation technology is raised, which combine rolling bases and dampers to isolate floor slabs from quake wave. Analysis towards scaled model dynamic test shows that this seismic isolation technology for floor slabs can effectively reduce response acceleration of floor slabs, especially when frequency of input acceleration is high. While frequency of input acceleration i

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12

Xu, Ming Yuan, Shui Qin Yao, Liang Li, Xing Fa Huang, Xiao Feng Shen, and Xi Chen. "A Low Power Reference Buffer Used in High-Speed High-Precision Pipelined ADC." Applied Mechanics and Materials 667 (October 2014): 379–82. http://dx.doi.org/10.4028/www.scientific.net/amm.667.379.

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An analysis of the output impedance of the reference buffer for pipelined ADC is presented is this paper. To achieve high performance of the reference buffer, damping network has added in. The output impedance of buffer amplifier is made equal to the resistance of the damping network. As a result, the effective impedance is made independent of frequency. Spectre simulation with 14-bit 250MSPS pipelined ADC loads, the results show the settling time can be achieved 1.2 ns with 0.0023% precision, and the noise floor per bin is-114dB with the power consumption is 42.3mW. The reference buffer can m

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13

Bader Eddin, Mohamad, Sylvain Ménard, Delphine Bard, Jean-Luc Kouyoumji, and Nikolaos-Georgios Vardaxis. "Sound insulation of lightweight wooden floor structures: ANN model and sensitivity analysis." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 4 (2023): 3094–108. http://dx.doi.org/10.3397/in_2022_0436.

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The artificial neural networks (ANN) approach is applied to estimate the acoustic performance for airborne and impact sound insulation curves of different lightweight wooden floors. The prediction model is developed based on 252 standardized laboratory measurement curves in one-third octave bands (50 - 5000 Hz). Physical and geometric characteristics of each floor structure (materials, thickness, density, dimensions, mass, and more) are utilized as network parameters. The predictive capability is satisfactory, and the model can estimate airborne sound better than impact sound cases especially

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14

Wang, Qian, Yang Yu, Yuan Bao Li, Shou Kui Li, and Wei Juan Zheng. "Vibra-Acoustic Characteristic Matching of Mini-Car Body Structure and Interior Acoustic Cavity in Low Frequency Range." Applied Mechanics and Materials 249-250 (December 2012): 685–90. http://dx.doi.org/10.4028/www.scientific.net/amm.249-250.685.

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This paper focused on the interior boom noise of a mini-car when driving at high speeds. Vehicle interior noise rotor drum tests in semi-anechoic room showed that vehicle interior boom noise in narrow frequency band exited near 250Hz. Structural and acoustic finite element analysis certified the front roof and rear floor coupled with interior acoustic cavity around this frequency, causing acoustic cavity resonance. On the base of sensitivity analysis technology, a structural improvement schemes pasting free damping fin on the front roof and rear floor of mini-car body for vibration and noise r

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15

Bedon, Chiara, and Filipe A. Santos. "Effect of Spring-Mass-Damper Pedestrian Models on the Performance of Low-Frequency or Lightweight Glazed Floors." Applied Sciences 13, no. 6 (2023): 4023. http://dx.doi.org/10.3390/app13064023.

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For structural design purposes, human-induced loads on pedestrian systems can be described by several simplified (i.e., deterministic equivalent-force models) or more complex computational approaches. Among others, the Spring-Mass-Damper (SMD), Single Degree of Freedom (SDOF) model has been elaborated by several researchers to describe single pedestrians (or groups) in the form of equivalent body mass m, spring stiffness k and damping coefficient c. For all these literature SMD formulations, it is proved that the biodynamic features of walking pedestrians can be realistically reproduced, with

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16

Jia, Wang, Mingjun Diao, Lei Jiang, and Guibing Huang. "Time-Frequency Characteristics of Fluctuating Pressure on the Bottom of the Stilling Basin with Step-Down Floor Based on Hilbert–Huang Transform." Mathematical Problems in Engineering 2021 (September 6, 2021): 1–12. http://dx.doi.org/10.1155/2021/7246488.

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Fluctuating pressure is an important feature of the bottom of a stilling basin with step-down floor. To analyze the frequency domain characteristics and energy distribution of this fluctuating pressure, the Hilbert–Huang transform (HHT) method is used. First, empirical mode decomposition is performed on the pressure fluctuation signal to obtain a number of intrinsic mode functions (IMFs), and then the Hilbert transformation is performed on each IMF to obtain the Hilbert spectrum and marginal spectrum for characterizing the pressure fluctuation signal. The results show that the fluctuating pres

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17

Goo, Hee-Mo, Soon-Seong Moon, and Jun-Oh Yeon. "A Case Study of Frequency Analysis of the Contribution of a Single Number Quantity to the Introduction of Rubber Ball Impact Sound and Changes in Assessment Methods." Applied Sciences 14, no. 24 (2024): 11998. https://doi.org/10.3390/app142411998.

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This study analyzed the effects of changes in the inter-floor noise assessment system in multi-family housing in Korea on heavy-weight impact sound performance assessment. By comparing the existing pre-approval system with the newly introduced post-verification system, we focused on the effects of the evaluation criteria, impact sources, and frequency band considerations on the single numerical evaluation quantities (L′i,Fmax,AW and L′iA,Fmax) and contribution rates by frequency band. For the analysis, impact sounds were measured using a bang machine used in the existing pre-approval system an

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18

Qi, Min, An-qiang Guo, and Dong-hai Qiao. "A High-Temperature, Low-Noise Readout ASIC for MEMS-Based Accelerometers." Sensors 20, no. 1 (2019): 241. http://dx.doi.org/10.3390/s20010241.

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This paper presents the development and measurement results of a complementary metal oxide semiconductor (CMOS) readout application-specific integrated circuit (ASIC) for bulk-silicon microelectromechanical system (MEMS) accelerometers. The proposed ASIC converts the capacitance difference of the MEMS sensor into an analog voltage signal and outputs the analog signal with a buffer. The ASIC includes a switched-capacitor analog front-end (AFE) circuit, a low-noise voltage reference generator, and a multi-phase clock generator. The correlated double sampling technique was used in the AFE circuit

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19

Al-Zamil, M. Kh, N. G. Kulikova, E. S. Vasilieva, I. A. Minenko, and D. M. Zalozhnev. "Efficacy of transcutaneous electroneurostimulation in treatment of erectile dysfunction associated with Covid-19." Fizioterapevt (Physiotherapist), no. 2 (March 25, 2023): 16–24. http://dx.doi.org/10.33920/med-14-2302-02.

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Background: Many studies provide data on the development of erectile dysfunction in patients after COVID-19. In most cases, the authors associated this complication with depression. However, in rare cases, erectile dysfunction is organic in nature as a result of pudendal neuropathy. Materials and methods: We examined 29 patients with the development of sexual erectile dysfunction after COVID-19. In all patients, entrapment of the pudendal nerve was detected using pudendal evoked potentials and needle electromyography of pelvic floor. All patients underwent standard medical therapy for the trea

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20

WAY, Evelyn. "Variability of low frequency laboratory measurements of acoustic isolation of floor/ceiling assemblies." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 270, no. 7 (2024): 3993–4001. http://dx.doi.org/10.3397/in_2024_3400.

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It has long been recognized that building acoustics measurements performed in laboratories exhibit a high degree of variability between and within labs. Traditional metrics limited the use of data to above the 100Hz or 125Hz one-third octave bands. In recent years, focus has widened the range of frequencies of interest to the 50Hz one-third octave band or lower. Analyzing measurements of low frequencies in buildings is complicated by the physical reality of wavelengths that are similar in scale to common room dimensions resulting in modal behavior and the mathematical simplification of the wav

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21

Yao, Dan, Jie Zhang, Rui-qian Wang, and Xin-biao Xiao. "Vibroacoustic damping optimisation of high-speed train floor panels in low- and mid-frequency range." Applied Acoustics 174 (March 2021): 107788. http://dx.doi.org/10.1016/j.apacoust.2020.107788.

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22

Ren, Guoteng, Saifei Yuan, Jingjing Peng, et al. "Attofarad-Class Ultra-High-Capacitance Resolution Capacitive Readout Circuits." Sensors 25, no. 8 (2025): 2461. https://doi.org/10.3390/s25082461.

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In order to meet the application requirements for high-precision and low-noise accelerometers in micro-vibration measurement and navigation fields, this paper presents the design and testing of an ultra-high-capacitance resolution capacitive readout circuit with attofarad-level precision. First, a differential charge amplifier circuit is employed for the first stage of capacitance detection. To suppress noise interference in the circuit, a frequency-domain modulation technique is utilized to mitigate low-frequency noise. Subsequently, a differential subtraction circuit is implemented to reduce

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23

Heo, Seokjae, Seunguk Na, and Wonjun Choi. "Serviceability Evaluation of High-Rise Buildings Exposed to Typhoon Proximity Effects Using ISO10137 and ISO6897." Buildings 13, no. 8 (2023): 2119. http://dx.doi.org/10.3390/buildings13082119.

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This study evaluates the vibration data of high-rise buildings during a typhoon by measuring the vibration data and using international serviceability standards. In order to do this, the horizontal vibration serviceability evaluation standards of each country were surveyed, but the standards that could be applied were limited to ISO10137 and ISO 6897. Despite the trend that the discomfort of residents increases as the number of high-rise buildings increases, the current standards are for high-frequency vibrations, such as machine vibrations or vertical floor vibrations, so there is an urgent n

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24

Rugthaicharoencheep, Nattachote, and Supawud Nedphokaew. "Analysis of Electric Field Distribution on Primary Windings of High-Voltage High-Frequency Transformers with Variables Characteristics." Energies 18, no. 2 (2025): 339. https://doi.org/10.3390/en18020339.

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This research aims to present a study of the effects of the Tesla transformer in order to find the proper dimensions. We created a design of the Tesla transformer to reduce the high-voltage electric field-stress problem that happens between primary winding and secondary winding. Because the Tesla transformer is used to induce voltage between these two windings through the air, problems with insulation occur. The winding that has space is dielectric; while there is high voltage in a transformer, it causes flashover voltage between the high-voltage winding and low-voltage winding, which damages

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25

Yu, Rui, Jiawei Qian, Liang Liu, Huasheng Zha, and Nan Li. "Microseismic Precursors of Coal Mine Water Inrush Characterized by Different Waveforms Manifest as Dry to Wet Fracturing." International Journal of Environmental Research and Public Health 19, no. 21 (2022): 14291. http://dx.doi.org/10.3390/ijerph192114291.

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Microseismic monitoring systems have been widely installed to monitor potential water hazards in limestone of the coal floor. The temporal and spatial distribution of rock fracture-induced microseismic events can be used as early warning indicators of potential water inrush from the coal floor. We established a microseismic monitoring system in the working face of Wangjialing coal mine. Besides traditional fluid-independent rock fracture-induced microseismic waveforms, fluid-dependent hybrid-frequency microseismic waveforms also play important roles in determining the microseismic precursors o

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26

Al-zamil, M. H., Z. M. Babochkina, E. S. Vasilyeva, and V. E. Illarionov. "Analgesic effect of interstitial and transvaginal electrical nerve stimulation in the treatment of women with chronic postpartum pelvic pain - Clinical study." Fizioterapevt (Physiotherapist), no. 1 (February 10, 2025): 22–30. https://doi.org/10.33920/med-14-2501-03.

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Abstract: 11,6 % of women may develop pelvic pain after childbirth as a result of dysfunction of the pelvic floor muscles. According to some data, this pain syndrome can last more than 3 years; in most cases it has a highly pharmacoresistant form. In clinical practice, transvaginal electrical nerve stimulation (TVES) and interstitial electrical nerve stimulation of the pelvic floor muscles (VTES) are used in the treatment of this disease. However, the characteristics of the analgesic effect of these treatment methods have not been sufficiently studied and have not been compared with each other

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27

Bohuslavskyi, Heorhii, Masayuki Hashisaka, Takase Shimizu, Takafumi Akiho, Koji Muraki, and Norio Kumada. "Fast time-domain current measurement for quantum dot charge sensing using a homemade cryogenic transimpedance amplifier." Applied Physics Letters 121, no. 18 (2022): 184003. http://dx.doi.org/10.1063/5.0118391.

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We developed a high-speed and low-noise time-domain current measurement scheme using a homemade GaAs high-electron-mobility-transistor-based cryogenic transimpedance amplifier (TIA). The scheme is versatile for broad cryogenic current measurements, including semiconductor spin-qubit readout, owing to the TIA's having low input impedance comparable to that of commercial room-temperature TIAs. The TIA has a broad frequency bandwidth and a low noise floor, with a trade-off between them governed by the feedback resistance RFB. A lower RFB of 50 kΩ enables high-speed current measurement with a −3 d

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28

Aryal, Biva, Bishnu Prasad Bhattarai, Mohan Pandey, and Anjana Giri. "Impact of forest floor fire on soil carbon sequestration of Pinus roxburghii forest in Langtang National Park, Nepal." Journal of Natural History Museum 30 (December 1, 2018): 148–63. http://dx.doi.org/10.3126/jnhm.v30i0.27550.

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Forest floor fires are known to be significantly important in carbon sequestration in soil. The present study investigated the total soil carbon stock (charcoal+soil organic carbon) andCO2 flux from four different depths (0-2, 2-10, 10-30 and >30cm) in fired and unfired forest of P. roxburghii from Langtang National Park, Nepal. The aim of this study was to test the impact of forest floor fire on soil carbon sequestration. We measured total carbon stock in soil of unfired and fired sites of different intensities namely: high frequency and high intensity, high frequency and moderate intensit

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29

Edwards, R. N. "Two‐dimensional modeling of a towed in‐line electric dipole‐dipole sea‐floor electromagnetic system: The optimum time delay or frequency for target resolution." GEOPHYSICS 53, no. 6 (1988): 846–53. http://dx.doi.org/10.1190/1.1442519.

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Towed in‐line transient electric dipole‐dipole systems are being used to map the electrical conductivity of the sea floor. The characteristic response of a double half‐space model representing conductive seawater and less conductive crustal material to a dipole‐dipole system located at the interface consists of two distinct parts. As time in the transient measurements progresses, two changes in field strength are observed. The first change is caused by the diffusion of the electromagnetic field through the resistive sea floor; the second is caused by diffusion through the seawater. The charact

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30

Jiao, Hong Guang, and Rui Xia Tian. "Experimental Study on High Intensity Magnetic Separator of Coal of Pingdingshan G Unit." Advanced Materials Research 113-116 (June 2010): 1849–55. http://dx.doi.org/10.4028/www.scientific.net/amr.113-116.1849.

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Self-made pairs of pole-type magnetic separator using materials of NdFeB. Permanent high gradient magnetic separator do without excitation current, the equipment with low cost, low operating costs, and highlights the advantages of small floor space, etc. Using stainless steel nets as a poly-magnetic medium, we conducted a dry separation experimental study on high-sulfur coal of Pingdingshan G unit, focusing on the vibration frequency; number of sorting and pulverized coal size, and the effect on the separation. The results showed that: the increase in desulfurization rate and ash removal rate

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Tashiro, Tsubasa, Noriaki Maeda, Junpei Sasadai, et al. "Characteristics of Falls Among Men’s Wheelchair Rugby Players in the Rio 2016 and Tokyo 2020 Summer Paralympic Games: A Video Analysis." Journal of Human Kinetics 84, no. 1 (2022): 233–37. http://dx.doi.org/10.2478/hukin-2022-0104.

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Abstract Wheelchair rugby is a contact sport in which falls are common and injury rates are high, yet the characteristics of the falls are still under-reported. We investigated the fall characteristics of men’s wheelchair rugby players by functional classification, using all 36 official match videos from the Rio 2016 and Tokyo 2020 summer Paralympic Games. The videos were analyzed to evaluate the number of falls, playing time when the fall occurred, playing phase (offense or defense), contact with other players, foul judgement, direction of the fall, and the body part first in contact with the

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Harris, David B. "Comparison of the direction estimation performance of high-frequency seismic arrays and three-component stations." Bulletin of the Seismological Society of America 80, no. 6B (1990): 1951–68. http://dx.doi.org/10.1785/bssa08006b1951.

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Abstract This paper presents a theoretical comparison of the backazimuth and velocity estimation performance of arrays and three-component stations in severe noise conditions. Theoretical estimates of performance for low signal-to-noise ratios (SNRs) are validated through simulation. The high SNR limits of array performance are determined through an empirical study of 23 events at a single source location. Theory and simulation indicate a gradual and uniform deterioration in three-component station performance as the SNR is decreased, beginning at relatively high SNR. At very low SNR, the sign

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Suryadi, Cahya, Indratmo Soekarno, Hadi Kardhana, and Arno Adi Kuntoro. "HIGH FLOW AND LOW FLOW FREQUENCY ANALYSIS OF CIKAPUNDUNG RIVER." Bearing : Jurnal Penelitian dan Kajian Teknik Sipil 8, no. 2 (2024): 52. http://dx.doi.org/10.32502/jbearing.v8i2.7840.

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Climate change that occurs in Indonesia, especially in the upstream and middle Citarum areas is marked by changes in rainfall. In addition to the phenomenon of climate change, an increase in the number of people that occur in an area will have an impact on land cover changes that will affect river flow, so the dominant parameters that cause changes in the flow between changes in rainfall and land cover changes need to be reviewed. This study aims to determine the effect of changes in rainfall and land cover changes on flood discharge and the shift of flow duration curve. The author chose 4 SUH

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Urbán, D., and P. Zat’ko. "On the Low Frequency Impact Noise Measurement in Residential Buildings." Journal of Physics: Conference Series 2069, no. 1 (2021): 012159. http://dx.doi.org/10.1088/1742-6596/2069/1/012159.

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Abstract We commonly encounter cases that, despite the fact that buildings meet normative requirements, people are disturbed by unwanted noise generated by walking and other sources of impact noise. It is not unusual that in practice the designer often moves on the edge of the required criteria in order to reduce the cost of constructions and its parts. In this article, we selected 4 blindly chosen cases of flats where complaints from residents about high levels of impact noise were recorded although the construction meets the requirements set out in the standard. Based on the obtained documen

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Bader Eddin, Mohamad, Sylvain Menard, Delphine Bard, Jean-Luc Kouyoumji, and Nikolas-Georgios Vardaxis. "A Sound Insulation Prediction Model for Floor Structures in Wooden Buildings Using Neural Networks Approach." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 2 (2021): 4166–76. http://dx.doi.org/10.3397/in-2021-2619.

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Recently, machine learning and its applications have gained a large attraction in different fields. Accurate predictions in building acoustics is vital especially in the design stage. This paper presents a sound insulation prediction model based on Artificial Neural Networks (ANNs) to estimate acoustic performance for airborne and impact sound insulation of floor structures. At an initial stage, the prediction model was developed and tested for a small amount of data, specifically 67 measurement curves in one third octave bands. The results indicate that the model can predict the weighted airb

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Chen, Linbi, Shanyu Han, Deyue Li, Jianchao Deng, Fuming Chen, and Ge Wang. "Vibration Performance of Bamboo Bundle/Wood Veneer Composite Floor Slabs for Joist-Type Floor Coverings." Buildings 13, no. 5 (2023): 1265. http://dx.doi.org/10.3390/buildings13051265.

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Bamboo engineering materials are green, high-strength, tough, durable, and structurally safe, and have promising application prospects in various modern green and low-carbon buildings. To investigate the vibration behavior of bamboo-bundle laminated veneer lumber (BLVL) for use in floor slabs, this study designed two kinds of full-scale vibration tests under a pedestrian load: an extraction hammer impact test and a static concentrated load test. The results are expected to provide a theoretical foundation and data to support the application of bamboo bundle veneer laminated composite materials

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Qian, Cheng, Sylvain Ménard, Delphine Bard-Hagberg, Jean-Luc Kouyoumji, and Juan Negreira. "Calibration of the ISO tapping machine for finite-element prediction tool on a wooden-base floor." Building Acoustics 26, no. 3 (2019): 157–67. http://dx.doi.org/10.1177/1351010x19855227.

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One important challenge of the wooden constructions is to achieve a high quality of acoustic insulation, especially decreasing the impact noise in the low-frequency range. In order to avoid over-designed solutions and expensive experimental tests in the design phase, reliable prediction tools are called for. This article is an initial investigation of modeling the ISO standardized tapping machine on a cross-laminated timber floor, using finite element method. The wooden-based floor was first calibrated in terms of its dynamic properties. The influence of the material properties of the cross-la

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Joko Sumbogo, Yuliarto, Dimas Ardiansyah, Joko Suparno, Kautzar Riski, and Dwi Andri W.H. "Analisis Daya Serap Suara Material Berbasis Polyester Staple Fibre Untuk Karpet Lantai Kendaraan." Accurate: Journal of Mechanical Engineering and Science 4, no. 1 (2023): 7–14. http://dx.doi.org/10.35970/accurate.v4i1.1791.

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This research studies about the ability of the acoustic properties or absorption of the vehicle floor carpet material which consists of several forming components, with an experimental method using the tube impedance method. The components of this car floor carpet material consist of a skin section which includes a surface made of polyester staple fiber plastic fiber, binders made of latex SBR material, backing made of Polyethylene (PE) powder and the under layer made of Polyester Fiber material (PET) Silencer. The carpet material for the vehicle floor was made into three samples to determine

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Fleischmann, Patrick, Heinz Mathis, Jakub Kucera, and Stefan Dahinden. "Implementation of a Cross-Spectrum FFT Analyzer for a Phase-Noise Test System in a Low-Cost FPGA." International Journal of Microwave Science and Technology 2015 (September 17, 2015): 1–7. http://dx.doi.org/10.1155/2015/757591.

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The cross-correlation method allows phase-noise measurements of high-quality devices with very low noise levels, using reference sources with higher noise levels than the device under test. To implement this method, a phase-noise analyzer needs to compute the cross-spectral density, that is, the Fourier transform of the cross-correlation, of two time series over a wide frequency range, from fractions of Hz to tens of MHz. Furthermore, the analyzer requires a high dynamic range to accommodate the phase noise of high-quality oscillators that may fall off by more than 100 dB from close-in noise t

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Wang, Xiao Lei, and Yong Wei Zhang. "A Noise-Optimal Integrator for High-Precision SC Sigma Delta Modulators." Applied Mechanics and Materials 644-650 (September 2014): 3322–28. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.3322.

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Based on N-well Chartered 0.35-um CMOS technology, we designed an integrator for a low-power and high-precision sigma-delta modulator, which has a structure of third-order CIFF, one bit quantization. Amplifier designed in this paper use the PMOS folded cascade differential structure. All switches of the switch capacitance integrator are CMOS switch. The structure-improved integrator can be used to preliminarily filter the noise power of the input signal, and reduce the noise into the modulator, combined with bottom plate sampling technology and the right timing sequence. Input sinusoidal signa

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Dean, Robert, George Flowers, Nicole Sanders, Roland Horvath, Michael Kranz, and Michael Whitley. "Micromachined Vibration Isolation Filters to Enhance Packaging for Mechanically Harsh Environments." Journal of Microelectronics and Electronic Packaging 2, no. 4 (2005): 223–31. http://dx.doi.org/10.4071/1551-4897-2.4.223.

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Some harsh environments, such as those encountered by missiles, rockets and various types of industrial machinery, contain high frequency mechanical vibrations. Unfortunately, some very useful components are sensitive to these high frequency vibrations. Examples include MEMS gyroscopes, oscillators and some micro-optics. Exposure to high frequency mechanical vibrations present in the operating environment can result in problems ranging from an increased noise floor to component failure. Passive micromachined silicon lowpass filter structures (spring-mass-damper) have been demonstrated in recen

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Méndez Echenagucia, Tomás I., Andrew A. Piacsek, and Nicolaas B. Roozen. "Cross laminated timber geometry and joinery implications on low-frequency sound transmission: FEA and Laser Doppler Vibrometry studies." Journal of the Acoustical Society of America 155, no. 3_Supplement (2024): A241—A242. http://dx.doi.org/10.1121/10.0027365.

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Cross Laminated Timber (CLT) slabs are becoming more widespread in North American construction in large part because of the environmental advantage of lower embodied carbon when compared to concrete and steel slabs. This advantage is significantly reduced by the use of high embodied carbon layers in the mass timber floor assemblies, such as concrete or gypsum screeds, that are used to reduce the direct sound transmission. This paper presents a study on the potential to reduce low-frequency sound transmission in cross-laminated timber floors by means of geometric stiffness. A laser doppler vibr

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Perelló-Roig, Rafel, Jaume Verd, Joan Barceló, Sebastià Bota та Jaume Segura. "A 0.35-μm CMOS-MEMS Oscillator for High-Resolution Distributed Mass Detection". Micromachines 9, № 10 (2018): 484. http://dx.doi.org/10.3390/mi9100484.

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This paper presents the design, fabrication, and electrical characterization of an electrostatically actuated and capacitive sensed 2-MHz plate resonator structure that exhibits a predicted mass sensitivity of ~250 pg·cm−2·Hz−1. The resonator is embedded in a fully on-chip Pierce oscillator scheme, thus obtaining a quasi-digital output sensor with a short-term frequency stability of 1.2 Hz (0.63 ppm) in air conditions, corresponding to an equivalent mass noise floor as low as 300 pg·cm−2. The monolithic CMOS-MEMS sensor device is fabricated using a commercial 0.35-μm 2-poly-4-metal complementa

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Abreu, Elizângela Márcia de Carvalho, Tatiana Sousa Cunha, Alderico Rodrigues de Paula Júnior, and Marco Antonio de Oliveira. "Effect of Global Postural Reeducation on cardiovascular system of healthy subjects." Fisioterapia em Movimento 27, no. 3 (2014): 389–97. http://dx.doi.org/10.1590/0103-5150.027.003.ao09.

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Objective To evaluate the effect of Global Postural Reeducation (GPR) on cardiovascular system by heart rate variability (HRV), blood pressure (BP) and heart rate (HR). Materials and methods Seventeen healthy men (22.47 ± 3.02 years) were submitted to the postures frog on the floor, frog on the air, sitting, standing against the wall and inclined standing, two postures per session. The systolic and diastolic blood pressure (SBP and DBP) and HR were recorded. The intervals between heartbeats were collected during the whole session (Polar S810i). The frequency domain was analyzed (Wavelet Transf

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Dionísio, Rogério, Fernando Ribeiro, and José Metrôlho. "Radio Interference of Wireless Networks and the Impact of AR/VR Applications in Industrial Environments." Electronics 12, no. 1 (2022): 67. http://dx.doi.org/10.3390/electronics12010067.

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The use of wireless communications systems on the factory shop floor is becoming an appealing solution with many advantages compared to cable-based solutions, including low cost, easy deployment, and flexibility. This, combined with the continuous growth of low-cost mobile devices, creates opportunities to develop innovative and powerful applications that, in many cases, rely on computing and memory-intensive algorithms and low-latency requirements. However, as the density of connected wireless devices increases, the spectral noise density rises, and, consequently, the radio interference betwe

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Li, Xiangyu, Jianping Hu, and Xiaowei Liu. "A High-Performance Digital Interface Circuit for a High-Q Micro-Electromechanical System Accelerometer." Micromachines 9, no. 12 (2018): 675. http://dx.doi.org/10.3390/mi9120675.

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Micro-electromechanical system (MEMS) accelerometers are widely used in the inertial navigation and nanosatellites field. A high-performance digital interface circuit for a high-Q MEMS micro-accelerometer is presented in this work. The mechanical noise of the MEMS accelerometer is decreased by the application of a vacuum-packaged sensitive element. The quantization noise in the baseband of the interface circuit is greatly suppressed by a 4th-order loop shaping. The digital output is attained by the interface circuit based on a low-noise front-end charge-amplifier and a 4th-order Sigma-Delta (Σ

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Zhang, Jiping. "Investigations on Coherence of Active Control of Traffic Noise Transmission through an Open Window into a Rectangular Room in High-Rise Buildings." Noise & Vibration Worldwide 34, no. 8 (2003): 8–17. http://dx.doi.org/10.1260/095745603771881865.

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A method for theoretically calculating the coherence between sound pressure inside a rectangular room in a high-rise building and that outside the open window of the room is proposed. The traffic noise transmitted into a room is generally dominated by low-frequency components, to which active noise control (ANC) technology may find an application. However, good coherence between reference and error signals is essential for effective noise reduction and should be checked first. Based on traffic noise prediction methods, wave theory, and mode coupling theory, the results of this paper enable one

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Bader Eddin, Mohamad, Jonathan M. Broyles, Sylvain Ménard, Delphine Bard, and Jean-Luc Kouyoumji. "A comparison of numerical approaches to quantity sound insulation of lightweight wooden floor structures." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 4 (2023): 3141–52. http://dx.doi.org/10.3397/in_2022_0440.

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Quantifying air-borne and structure-borne sound insulation is an important design consideration for the indoor comfort of a building. Although sound insulation performance is commonly measured experimentally, numerical methods can have time-saving and economic benefits. Further, numerical methods can be incorporated within building simulations to provide an estimate of the acoustic environment. In response, this paper evaluates three different computational approaches for quantifying sound insulation in one-third octave bands (50-5000 Hz) of a lightweight floor including: an artificial neural

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Zhang, Jie, Dan Yao, Wang Peng, Ruiqian Wang, Jiang Li, and Shaoyun Guo. "Optimal design of lightweight acoustic metamaterials for low-frequency noise and vibration control of high-speed train composite floor." Applied Acoustics 199 (October 2022): 109041. http://dx.doi.org/10.1016/j.apacoust.2022.109041.

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Singh, Harshvardhan, Daniel G. Whitney, Christopher A. Knight, et al. "Site-Specific Transmission of a Floor-Based, High-Frequency, Low-Magnitude Vibration Stimulus in Children With Spastic Cerebral Palsy." Archives of Physical Medicine and Rehabilitation 97, no. 2 (2016): 218–23. http://dx.doi.org/10.1016/j.apmr.2015.08.434.

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