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Dissertations / Theses on the topic 'Power tools - Noise control'

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Published: 4 June 2021

Last updated: 10 February 2022

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1

FOUTS, II BRUCE EDWARD. "INVESTIGATION INTO TESTING METHODS AND NOISE CONTROL OF INDUSTRIAL POWER TOOLS." University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1029443901.

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2

Santos, Christian dos. "Investigação dos metodos de determinação de potencia sonora visando programas para etiquetagem de furadeiras eletricas de uso domestico." [s.n.], 2004. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258523.

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Orientador: Stelamaris Rolla Bertoli<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo<br>Made available in DSpace on 2018-08-05T23:46:28Z (GMT). No. of bitstreams: 1 Santos_Christiandos_M.pdf: 3511506 bytes, checksum: d365f6dc71d5566b93533834923018e0 (MD5) Previous issue date: 2004<br>Resumo: A existência de fenômenos acústicos depende de três fatores: a fonte, o meio e o receptor. Para a prevenção de condições ruidosas em certos ambientes, é necessário o conhecimento de uma característica própria da fonte que não sofre int

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3

Callahan, Gregory. "Noise levels of common construction power tools." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0004882.

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4

Ericson, Liselott. "On Fluid Power Pump and Motor Design : Tools for Noise Reduction." Doctoral thesis, Linköpings universitet, Fluida och mekatroniska system, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-73981.

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Noise and vibration are two of the main drawbacks with fluid power systems. The increasing requirements concerning working environment as well as machines' impact on surroundings put components and systems to harder tests. The surrounding machines, e.g. combustion engines, have made considerable progress regarding the radiated noise. This allows the fluid power system's noise to become more prominent. Noise from fluid power systems has been a research topic for several decades and much improvement has been achieved. However, considerable potential for improvement still remains. In addition to

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5

Schwartz, Kyle Wayne. "Acoustic Characterization and Preliminary Noise Control of Pneumatic Percussion Tools." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/34742.

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Pneumatic percussion tools are extensively used in the construction industry. They are one of the noisiest machines in the construction industry generating noise levels above 110 dBA which are well beyond the permissible exposure limit (PEL) of 85 dBA. This work presents a comprehensive methodology for the acoustic characterization and noise source identification of these percussion tools. The methodology is applied to a representative pneumatic tool and the characterization results are described in detail. A mechanical analysis was performed on a chipping hammer finding mode shapes and natur

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6

Austin, Lisa. "An experimental and theoretical investigation of noise and power reduction in high speed cable making machinery." Thesis, University of Southampton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245051.

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7

Wong, Chor-kuen. "A review of policy tools for noise control in Hong Kong : the case of construction industry /." View the Table of Contents & Abstract, 2005. http://sunzi.lib.hku.hk/hkuto/record/B31365139.

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8

Wong, Chor-kuen, and 王楚權. "A review of policy tools for noise control in Hong Kong: the case of construction industry." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B45012696.

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9

Prat, Joaquin, Alvaro Romero, Sandra Rodriguez, and Julio Farje. "Optimization of the control process in residential buildings using technological tools." Institute of Electrical and Electronics Engineers Inc, 2020. http://hdl.handle.net/10757/656567.

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Many construction companies worldwide continue to implement different methodologies to optimize time and improve management in the execution of works; however, a lack of control in projects continues to be observed. For this reason, one of the most common problems currently is the incompletion of scheduled work. Due to this, it is necessary to keep better control of the projects at the execution stage so that the contractor can optimally, quickly, and easily manage the progress of all the specialties involved. In this sense, this research develops the use of the Plan Grid Application for data

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10

Ahmed, Muhammad Swilam Abdelhaleem. "Highly-efficient Low-Noise Buck Converters for Low-Power Microcontrollers." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1542277717997166.

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11

Cao, Renfang. "Power efficiency analysis for an Active structure." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/27186.

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Methods for analyzing the structural-acoustic power efficiency of active structures are developed. For this work we define the power efficiency as the ratio of the sound power radiated by a structure to the maximum possible radiated sound power. An active structure is defined as one that has electromechanical actuators distributed over its surface for the purpose of structural-acoustic excitation. The power efficiency of planar, baffled structures with arbitrary boundary conditions is examined using a combination of methods based on numerical integration, variational principles, and finite ele

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12

Fégeant, Olivier. "Noise from wind turbines /." Stockholm, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3100.

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13

Gruber, Elliott Ross. "Optimal configuration of adjustable noise suppressors." Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47616.

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Noise generated by fluid power applications can be treated using bladder-style suppressors, and an optimal operating condition for these devices is sought in this thesis. Bladder-style suppressors employ a compliant nitrogen-charged bladder to create an impedance change within the system, reflecting the noise back to the source and preventing it from propagating downstream. The noise in a hydraulic system is created by a pump, the flow source in a hydraulic system, and can be separated into three categories: fluid-borne noise, structure-borne noise and airborne noise. Fluid-borne noise places

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14

Earnhart, Nicholas Edmond. "Modeling and validation of a syntactic foam lining for noise control devices for fluid power systems." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/50151.

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Excessive fluid-borne noise in hydraulic systems is a problem the fluid power industry has long struggled to address. Traditional noise control devices such as Helmholtz resonators, tuning coils, and Herschel-Quincke tubes are generally too large for fluid power systems unless the speed of sound in the device can be reduced. A compliant lining can achieve this effect, but compliance (and lossy compliance) has had little attention in noise control in general, and in fluid power in particular. One means to achieve compliance in these devices, especially at elevated pressures, is through a liner

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15

Esplin, John J. "Active Noise Control of a Centrifugal Fan Mounted in a Mock Laptop Enclosure." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3577.

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Noise from information technology (IT) equipment is a significant problem in today's modern society. Active Noise Control (ANC) has shown promise in reducing the effect of IT fan noise on users. Though ANC has been applied to axial fans (such as those found in desktop computers), it has not been applied to centrifugal fans, such as those found in laptop computers. This work applies an ANC method to a centrifugal fan mounted in a mock laptop enclosure. This method is applied in four steps. First, secondary sources are placed in the vicinity of the fan. Second, an accurate model of the radiation

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16

Bottura, Riccardo <1986&gt. "Modelling and analysis of networked control strategies in smart power distribution grids: development of co-simulation tools." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amsdottorato.unibo.it/7062/.

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This thesis is focused on Smart Grid applications in medium voltage distribution networks. For the development of new applications it appears useful the availability of simulation tools able to model dynamic behavior of both the power system and the communication network. Such a co-simulation environment would allow the assessment of the feasibility of using a given network technology to support communication-based Smart Grid control schemes on an existing segment of the electrical grid and to determine the range of control schemes that different communications technologies can support. For th

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17

Jayakumar, Vignesh. "Evaluation and Design of Noise Control Measures for a Pneumatic Nail Gun." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1428049303.

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18

KATAYAMA, Masaaki, Takaya YAMAZATO, and Yuzo OHTOMO. "An Access Control Method for Multipoint Cyclic Data Gathering over a PLC Network." IEEE, 2010. http://hdl.handle.net/2237/14463.

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19

Chester, Ryan T. "Error Sensor Strategies for Active Noise Control and Active Acoustic Equalization in a Free Field." Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2298.pdf.

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20

Mailhot, Nathaniel. "Pupil Tracking and Control of a Laser Based Power System for a Vision Restoring Retinal Implant." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/38709.

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For elderly Canadians, the prevalence of vision impairment caused by degenerative retinal pathologies, such as age-related macular degeneration and retinitis pigmentosa, is at an occurrence rate of 14 percent, and on the rise. It has been shown that visual function can be restored by electrically stimulating intact retinal tissue with an array of micro-electrodes with suitable signals. Commercial retinal implants carrying such a micro-electrode array achieve this, but to date must receive power and data over copper wire cable passing through a permanent surgical incision in the eye wall

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21

Arapan, Lilia. "Thin Film Plate Acoustic Resonators for Frequency Control and Sensing Applications." Doctoral thesis, Uppsala universitet, Fasta tillståndets elektronik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-178592.

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The recent development of the commercially viable thin film electro-acoustic technology has triggered a growing interest in the research of plate guided wave or Lamb wave components owing to their unique characteristics. In the present thesis i) an experimental study of the thin film plate resonators (FPAR) performance operating on the lowest symmetrical Lamb wave (S0) propagating in highly textured AlN membranes versus a variety of design parameters has been performed. The S0 mode is excited through an Interdigital Transducer and confined within the structure by means of reflection from metal

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22

Masiero, Bruno Sanches. "Controle ativo de ruído para transformadores de potência em campo." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/3/3142/tde-09012008-112327/.

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É cada vez maior a preocupação com a poluição sonora gerada pelos transformadores de potência de subestações elétricas. Atualmente, o controle desse tipo de ruído é feito utilizando-se métodos passivos, que são caros e dificultam a manutenção dos transformadores. Uma alternativa para os métodos passivos é o controle ativo de ruído (ANC). Apesar de extensas pesquisas realizadas nas últimas três décadas, ainda não existem soluções comercialmente viáveis para o ANC de transformadores. As dificuldades para a aplicação bem sucedida do ANC para transformadores foram investigadas por meio de simulaçõ

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23

Alva, Cruz Josselyn Estefanía. "The implementation of business policies of use and control of technological work tools as an effective mechanism to suspend the expectation of confidentiality in the employment relationship." Derecho & Sociedad, 2017. http://repositorio.pucp.edu.pe/index/handle/123456789/117473.

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Based on the considerations presented by the Constitutional Court in the light of a specific case, this article addresses the discussion about the limit of intervention that the employer has to intercept and collect those communications that are protected by the secrecy of the law of the Communications of workers, establishing the possibility of implementing new control mechanisms that suspend any kind of expectation of confidentiality.<br>A partir de las consideraciones expuestas por el Tribunal Constitucional en atención a un caso en concreto, el presente artículo aborda la discusión sobre e

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24

Anderson, Monty J. "Active Control of the Human Voice from a Sphere." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/5295.

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This work investigates the application of active noise control (ANC) to speech. ANC has had success reducing tonal noise. In this work, that success was extended to noise that is not completely tonal but has some tonal elements such as speech. Limitations such as causality were established on the active control of human speech. An optimal configuration for control actuators was developed for a sphere using a genetic algorithm. The optimal error sensor location was found from exploring the nulls associated with the magnitude of the radiated pressure with reference to the primary pressure field.

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25

Smigelski, Jeffrey Ralph. "Water Level Dynamics of the North American Great Lakes:Nonlinear Scaling and Fractional Bode Analysis of a Self-Affine Time Series." Wright State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=wright1379087351.

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26

Jerndahl, Fineide Mona. "Controlled by Knowledge : A Study of two Clinical pathways in Mental Healthcare." Doctoral thesis, Karlstads universitet, Fakulteten för ekonomi, kommunikation och IT, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-12937.

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Standardisation of professional work is a major policy concern to ensure quality and efficiency of services and a number of hospitals are now focusing on the use of clinical pathways as an important tool to standardise their work. This study sheds light on the processes set in motion when notions of standardisation meet local practice. In order to gain insight into what clinical pathways mean for professional work in mental health care, the focus of the study was to explore the contexts in which standardisation by “rule production” takes place. Two empirical cases from Norwegian mental health

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27

Straka, Martin. "Výpočtové modelování vysokofrekvenčního hluku v kabině letounu EV-55M." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230560.

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This thesis describes methods of high frequency noise and vibrations computation of cabin part of EV–55M (aircraft developed by Evektor Kunovice). There is a brief summary of methods used for determining high frequency noise and vibrations in the first part of the thesis. Detailed explanation is given for Statistical Energy Analysis (SEA) which is nowadays the most dominant method in this area. The energy balance equation is derived in this chapter and SEA parameters such as modal density, damping loss factor, coupling loss factor and power input are introduced here. Next part deals with main

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28

Zhang, Zhi-Wei, and 張智為. "New Auxiliary Noise Power Scheduling in Active Noise Control Systems with Online Secondary Path Modeling." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/08272600822138173021.

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碩士<br>國立中興大學<br>機械工程學系所<br>104<br>In an active noise control (ANC) system with online secondary path modeling, a white noise is added and used as a reference signal to identify a transfer function of the secondary path. However, the white noise will also influence the ANC system in the steady state and reduce the noise reduction performance of the system. Therefore, this study proposes a new auxiliary noise power scheduling (ANPS) to adjust white noise according to the variation level of noise attenuation such that the influence of white noise can reduce in the steady state. Moreover, an auxil

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29

Wei-HanChen and 陳韋翰. "Control of Engine Power Generation System for Vibration and Noise Reduction." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/3gsusa.

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30

Chen, Kai-Jyun, and 陳楷峻. "Auxiliary Noise of Exponential-Decay Power for Online Acoustic Feedback Path Modeling in Active Noise Control Systems." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/71131466138133917293.

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碩士<br>國立中興大學<br>機械工程學系所<br>102<br>The practical application of dual microphones active noise control system structure, the reference microphone will not only measure noise source signal, but also measure return control sound by the control speaker, so it will generate the phenomenon of acoustic feedback, and highlight the impact of white noise in steady-state system. Therefore, in order to solve these problems, this paper proposes VSS-NFxLMS/CE-ANEDP algorithm to model feedback path to solve the effects of acoustic feedback and reduce the impact of white noise for the system. In this paper , a

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31

Chu, Ming-Laing, and 朱明亮. "GPS baseline vector quality control with carrier- to- noise power density ratio." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/12991165532957893218.

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碩士<br>中正理工學院<br>軍事工程研究所<br>88<br>GPS has been the highly accurate positioning technique through many researchers'' efforts over twenty years, but multipath effect, signal fraction, and other uncertain influences may decline the accuracy of position. The key for maintaining the high accuracy merit of GPS positioning is the quality of GPS raw data, so the quality control procedure is needed. Since the carrier-to-noise ratio of beat phase observation is related to GPS raw data and the new RINEX format of version 2.1 does include the ratio values, the carrier-to-noise ratio is considered as the qu

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32

Huang, Shih-Jhan, and 黃士展. "Optimal Variable Step-Size and Auxiliary Noise Power Scheduling for Active Noise Control Systems with Online Feedback Path Modeling." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/98063132478057416596.

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碩士<br>國立中興大學<br>機械工程學系所<br>101<br>In practical case of active noise control (ANC) system structure for the dual microphones, by the reference microphone and the error microphone composed. The reference microphone will pick up a signal from the feedback path of the ANC system, causing the acoustic feedback problem. In general the FxLMS algorithm does not consider the acoustic feedback compensation, thus reducing the active noise control system performance, worse case may make active noise control system becomes unstable. To solve the problem of acoustic feedback, we use literature proposed the

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33

Jiang, Zhongwei. "Low Cost Power and Supply Noise Estimation and Control in Scan Testing of VLSI Circuits." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8915.

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Test power is an important issue in deep submicron semiconductor testing. Too much power supply noise and too much power dissipation can result in excessive temperature rise, both leading to overkill during delay test. Scan-based test has been widely adopted as one of the most commonly used VLSI testing method. The test power during scan testing comprises shift power and capture power. The power consumed in the shift cycle dominates the total power dissipation. It is crucial for IC manufacturing companies to achieve near constant power consumption for a given timing window in order to keep the

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34

(6417068), Dan Ding. "Implementation of Microphone Array Processing Techniques on A Synthetic Array for Fluid Power Noise Diagnostics." Thesis, 2019.

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<div>Fluid power is widely used in a variety of applications such as construction machines, aerospace, automotive, agricultural machinery, manufacturing, etc. Although this technology has many obvious advantages such as compactness, robustness, high power density, and so forth, there is much room for improvement, of which one of the most important and challenging problems is the noise.</div><div><br></div><div>Different institutes have been researching fluid power noise for decades. However, much of the experimental investigation was based on simple measurement and analysis techniques, which l

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35

Ku, Cheung-Chieh, and 古忠傑. "Passive Fuzzy Control for Takagi-Sugeno Fuzzy Model with Multiplicative Noise and Applications to Power System Dynamic Stability Study." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/77663207343992860444.

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博士<br>國立臺灣海洋大學<br>電機工程學系<br>98<br>In this dissertation, the Takagi-Sugeno (T-S) fuzzy model with the multiplicative noises is used to represent the complex nonlinear stochastic system. According to stochastic modeling approach, the consequently part of concerned T-S fuzzy model is structured by Itô Stochastic Differential Equation (SDE). And for practical environment, the performance requirements are also important issues in control systems except for stability. For those issues, the effect of external disturbance on systems is discussed by passivity theory. Furthermore, the robust control pro

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36

Ghosal, Kaushik. "Power Scaling Mechanism for Low Power Wireless Receivers." Thesis, 2015. http://etd.iisc.ernet.in/2005/3767.

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LOW power operation for wireless radio receivers has been gaining importance lately on account of the recent spurt of growth in the usage of ubiquitous embedded mobile devices. These devices are becoming relevant in all domains of human influence. In most cases battery life for these devices continue to be an us-age bottleneck as energy storage techniques have not kept pace with the growing demand of such mobile computing devices. Many applications of these radios have limitations on recharge cycle, i.e. the radio needs to last out of a battery for long duration. This will specially be true fo

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37

(9750938), Leandro Henschel Danes. "COMPUTATIONAL METHODS FOR DESIGNING NEW PASSIVE FLUID BORNE NOISE SOURCE REDUCTION STRATEGIES IN HYDRAULIC SYSTEMS." Thesis, 2020.

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<p>Hydraulic systems have many applications in the construction, transportation, and manufacturing sectors. Recent design trends involve systems with higher working pressures and more compact systems, which are advantageous because of power density increase. However, these trends imply higher forces and larger vibration amplitudes while having lesser mass and damping, leading to higher noise levels. Meanwhile, hydraulic machinery started prospecting new applications with tighter noise regulations, a trend which was also pushed by the electrification tendency in several fields of transportatio

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