Gotowe bibliografie tematyczne / Mount

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Gotowa bibliografia na temat „Mount”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 1 sierpnia 2024

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Artykuły w czasopismach na temat "Mount"

Khazrik, Jessica. "Mount Mound Refuse". Kohl: A Journal for Body and Gender Research 2, Summer (1.06.2016): 103–10. http://dx.doi.org/10.36583/kohl/2-1-11.

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Vahdati, Nader, i Mehdi Ahmadian. "Variable Volumetric Stiffness Fluid Mount Design". Shock and Vibration 11, nr 1 (2004): 21–32. http://dx.doi.org/10.1155/2004/751042.

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Passive fluid mounts are commonly used in the automotive and aerospace applications to isolate the cabin from the engine noise and vibration. Due to manufacturing and material variabilities, no two identical fluid mount designs act the same. So, fluid mounts are tuned one by one before it is shipped out to customers. In some cases, for a batch of fluid mounts manufactured at the same time, one is tuned and the rest is set to the same settings. In some cases they are shipped as is with its notch frequency not being in its most optimum location. Since none of the passive fluid mount parameters are controllable, the only way to tune the mount is to redesign the mount by changing fluid, changing inertia track length or diameter, or changing rubber stiffness. This trial and error manufacturing process is very costly. To reduce the fluid mount notch frequency tuning cycle time, a new fluid mount design is proposed. In this new fluid mount design, the notch frequency can be easily modified without the need for any redesigns. In this paper, the new design concept, and its mathematical model and simulation results will be presented.

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KUO, E. Y. "VEHICLE HIGH MILEAGE POWERTRAIN MOUNT DEGRADATION ANALYSIS". International Journal of Reliability, Quality and Safety Engineering 09, nr 04 (grudzień 2002): 341–45. http://dx.doi.org/10.1142/s0218539302000883.

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Vehicle high mileage warranty issues associated with powertrain mounts are one of the major concerns in vehicle design for long-term customer satisfaction. The present paper is concerned with a root cause understanding of high mileage degradation mechanisms of hydraulic engine mounts. Engine mount stiffness degradation characteristics are studied using laboratory test data. The correlation between the number of powertrain mount related warranty claims and mean temperatures of different geographic areas in the United States is presented. The effects of underhood thermal management design on mount temperature and strategies for improving high mileage mount degradation are discussed.

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Graf, P. L., i R. Shoureshi. "Modeling and Implementation of Semi-Active Hydraulic Engine Mounts". Journal of Dynamic Systems, Measurement, and Control 110, nr 4 (1.12.1988): 422–29. http://dx.doi.org/10.1115/1.3152706.

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In an effort to improve passenger comfort, the automotive industry is evaluating more sophisticated techniques to reduce engine excited frame vibrations. A new approach is to implement hydraulic mounts in a semi-active mode. In this mode, low power actuators are used to change the impedance characteristics of the mount. This paper presents a dynamic model and analysis of the semi-active hydraulic mount. Experimental data confirming the mount model are presented. Finally, results of an experimental study on the implementation of the semi-active mounts on a production automotive vehicle are presented. The study focuses on frame vibration reduction during engine idle. The semi-active hydraulic mounts show improved vibration levels over passive hydraulic mounts in the vehicle application.

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Oh, Jong Seok, Seung Bok Choi, Vien Quoc Nguyen, Seok Jun Moon i Sang Min Choi. "Vibration Control Performance of Active Mount System Featuring Inertial Piezostack Actuator". Advanced Materials Research 317-319 (sierpień 2011): 573–76. http://dx.doi.org/10.4028/www.scientific.net/amr.317-319.573.

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This paper proposes an active mount of naval ships in order to reduce unwanted vibrations. The active mount consists of rubber element and piezostack actuator. To avoid being broken piezostack actuator, the inertial actuator which the piezostack actuator is connected to the inertial mass and rubber element is devised. After describing the configuration of the mount, the active mount system supported by four mounts is then constructed. To attenuate the transmitted vibrations, the feedforward control is designed and experimentally implemented to the system. Vibration control performances such as vertical accelerations are evaluated at each mount and presented in frequency domain.

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Ohadi, A. R., i G. Maghsoodi. "Simulation of Engine Vibration on Nonlinear Hydraulic Engine Mounts". Journal of Vibration and Acoustics 129, nr 4 (9.04.2007): 417–24. http://dx.doi.org/10.1115/1.2748459.

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In this paper, vibration behavior of engine on the nonlinear hydraulic engine mount, including inertia track and decoupler, is studied. In this regard, after introducing the nonlinear factors of this mount (i.e., inertia and decoupler resistances in turbulent region), the vibration governing equations of engine on one hydraulic engine mount are solved and the effect of nonlinearity is investigated. In order to have a comparison between the rubber and the hydraulic engine mounts, a six-degree-of-freedom four-cylinder V-shaped engine under shaking and balancing mass forces and torques is considered. By solving the time domain nonlinear equations of motion of the engine on three inclined mounts, translational and rotational motions of an engine body are obtained for different engine speeds. Transmitted base forces are also determined for both types of engine mount. Comparison of rubber and hydraulic mounts indicates the efficiency of a hydraulic one in the low-frequency region.

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Park, So-Hee, Chan-Jung Kim i Yeonjune Kang. "Evaluation of the Supporting Mounts of a Three-in-One Electric Drive Unit Using a Hybrid Simulation Model". Machines 11, nr 11 (16.11.2023): 1026. http://dx.doi.org/10.3390/machines11111026.

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The 3-in-1 electric drive unit (EDU) has the advantage of increasing the motor size for a larger output, and the reducer can be a compact layout designed to incorporate three key components—the drive motor, inverter, and reducer—into a single main body. This paper explores a hybrid simulation model for a 3-in-1 electromechanical drive unit (EDU) and its supporting components, consisting of the gear drive unit (GDU) mount, the motor mount, and the roll rod mounts. The synthesis of these sub-components, including the 3-in-1 EDU itself, the three supporting mount modules, and a rigid-body finite element model, is presented. The dynamics of the 3-in-1 EDU were determined through an experimental modal test. Meanwhile, the dynamic stiffness and damping coefficients of the three supporting mounts were measured using an elastomer tester across a frequency range from 10 Hz to 1000 Hz. To evaluate the sensitivity of each mount, the total spectral responses of the 3-in-1 EDU were compared under a torque input, considering rigid connections for each mount in contrast to their original dynamic stiffness. Through installing a rollrod mount, the optimal rigid connection was identified to control the dynamic response of the 3-in-1 EDU hybrid model. Furthermore, simulation results for the rigid connections in each mount were validated against experimental findings, confirming that the rigid rollrod mount configuration provided the best results.

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Zainudin, Iskandazaqwan Zikrullah, i Ooi Lu Ean. "Experimental Identification On Non Linear Properties of Rubber Mount". MATEC Web of Conferences 217 (2018): 02007. http://dx.doi.org/10.1051/matecconf/201821702007.

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In actual installation, rubber mount are usually excited by different engine force amplitude and frequency. For better characterization of rubber mount, dynamic properties of metal to rubber mount are tested in this paper by using hysteresis loop method. Stiffness and loss factor of rubber mount are calculated from measured hysteresis loop. Experimental works are carried to identify the non-linearity in the amplitude dependent and frequency dependent properties of rubber mount. the s-shaped of hysteresis loop represent as non-linear behavior of rubber mount. the comparison is done for the dynamic properties of rubber mount under different excitation condition. the non-linear behavior of the rubber mount under excitation forced are reported. the result show stiffness change non-linearly according to different amplitude excitation force under different excitation frequency. the observation is significant especially when the excitations force is higher than 5N for the small metal to the rubber mounts. However this observation is different compared to the condition where excitation frequency getting higher. the non-linearity in the rubber mount is becoming not significant when the excitation frequency is getting higher.

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John, Reji, i Shiv Kumar. "D evelopment and Testing of a Closed Loop Feedback Controlled Magnetorheological Fluid Anti-vibration Mount for Onboard Naval Applications". Defence Science Journal 66, nr 4 (28.06.2016): 374. http://dx.doi.org/10.14429/dsj.66.10211.

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An intelligent semi-active anti-vibration mount using a magnetorheological (MR) fluid is designed and developed for onboard applications. The mount consists of a load bearing elastomer, MR fluid chamber; MEMS based vibration sensor and a controller for closed loop feedback mechanism. The controller regulates the solenoid current in the MR fluid chamber, which in turn regulates the flow of MR fluid through the valve. Comparison of the performance of MR mount with a passive resilient rubber mount shows that the former provides 7 dB extra damping at resonance compared to the later and the isolation of MR mount starts at 10 Hz compared to 50 Hz by rubber mount. This mount can operate in real time, passive and active modes by using a closed loop feedback control mechanism. The efficacy of the mount for outdoor applications is evaluated by characterizing the mechanical, environmental, electrical and electromagnetic properties as per MIL-17185, JSS-55555 and IEC 61000 standards and found to be superior compared to passive mounts. The mount is being evaluated for onboard applications in INS Ranvijay.

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Hojoon, Moon, Yang Qiu i Kim Byeongil. "Multi-directional active vibration control of 1D smart structure inspired by automotive engine mounting system". INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, nr 7 (1.02.2023): 635–40. http://dx.doi.org/10.3397/in_2022_0086.

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Recently, active mounting system is being gradually applied to automotive engine mounts for mitigating structure-borne vibration effectively throughout the whole vehicle chassis. This paper presents modeling, analysis, and control of a source structure with an active mounting system in multi-directions, considering position and direction of actual automotive engine mounts. The active mount consists of a piezoelectric stack actuator in series with an elastomeric (rubber) mount. When harmonic excitation forces are employed, secondary force required for each active mount is calculated mathematically and the control signal can reduce the vibration through the destructive interference with input signal. In addition, the horizontal vibration can also be mitigated by setting a variable parameter through the dynamic relation of source structure. A series of simulation results demonstrate that the excitation vibration could be reduced along with this multi-directional (vertical and horizontal) active mounts. Based on this result, it can be expected that noise vibration harshness(NVH) performance can be improved by controlling the vibration of the actual automotive engine structure with rubber mount and secondary force of actuators in both vertical and horizontal directions.

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Rozprawy doktorskie na temat "Mount"

Queener, Nathan Lee. "The People of Mount Hope". Youngstown State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1263334302.

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Queener, Nathan L. "The people of Mount Hope /". Connect to resource online, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1263334302.

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Bircham, John Stanley. "Avalanche hazard forecasting at Mount Hutt". Thesis, University of Canterbury. Department of Geography, 1995. http://hdl.handle.net/10092/2776.

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The decision making process of avalanche hazard forecasting was studied during the ski season of 1995 at Mount Hutt. The objective was to derive the main contributing factors of avalanche forecasting and then assess the potential of Geographic Information Systems (GIS) as a tool to assist with the decision making process. A snow distribution model was developed utilising the contributing factors that were identified. Interviews were conducted with the three principle avalanche forecasters from the Mount Hutt Ski Patrol. Each forecaster was presented with a series of storm scenarios, and then asked what information they wanted to know and when they wanted it, while making their avalanche hazard assessment and forecast. The information requested by each forecaster were very similar. However, there was a distinct difference with how each forecaster interpreted the available information. They often used different approaches when assessing snow stability, but ultimately arrived at the same conclusion about the potential avalanche hazard. The key contributing factors identified in this research were wind speed and direction, snowfall intensity, the amount of new snow, and the surface conditions upon which the new snow was being deposited. A GIS model using Grid was developed to assess the spatial distribution of snow during two storm scenarios. The model appeared to work well, given that it was only designed to assess the potential of GIS. The resulting output of the model would have provided the forecasters with a more accurate estimate of snow distribution. Forecasters have to estimate the spatial distribution of snow and its stability, based on experience and know knowledge. GIS has the potential to provide accurate estimates of this distribution, that could ultimately assist conventional avalanche forecasters.

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Ekman, Karl, i Andreas Holman. "K2 - Mindre företag i revisionsbranschens "Mount Everest"?" Thesis, Södertörn University College, School of Business Studies, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-3498.

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Bakgrund och problemdiskussion: Med bakgrund i regeringens mål i att minska de administrativa kostnader för företag, beslutade Bokföringsnämnden 2004 att ändra inriktning på den praxis som då fanns för redovisning. Detta genom att ta fram nya och samlade regelverk för noterade och icke-noterade företag. Regelverken delades upp i fyra kategorier baserat på företagsform och storlek K1-K4. I dagsläget finns olika regelverk och rekommendationer att tillämpa, vilka ges ut av olika organisationer. Förenklingarna för företagen i K2 kategorin består i att alla redovisningsregler ska finnas i ett samlat dokument, samt att det inte ska vara möjligt att välja olika alternativa redovisningsprinciper. Hur stora fördelarna är med det nya regelverket beror dock på företagets kompetens och resurser avseende externredovisning. En bransch som passar väl in på föregående beskrivning är revisionsbranschen. För att studera om revisionsbranschen har uppfattat de eventuella fördelar ska författarna undersöka hur många mindre revisionsföretag som själva redovisar enligt BFNAR 2008:1 och om det finns någon urskiljande karakteristik för dem.

Syfte: Uppsatsen är explorativ och syftar till att undersöka hur många som har tillämpat BFNAR 2008:1 och se om det är någon skillnad kontra de som inte valt att tillämpa K2-regelverket. Vidare kommer det även undersökas om det finns någon urskiljande karakteristik för den gruppen som valt att tillämpa K2, samt att se hur revisionskostnaden har påverkats.

Metod: Uppsatsen kommer att genomföras med det analytiska synsättet som grund, där författarna ska genomföra en beskrivande undersökning där om möjligt karakteristik ska identifieras. Affärsdata ligger till underlag för empirinsamlingen. Resultatet av undersökningen analyseras utifrån den teoretiska referensramen i uppsatsen för att besvara problemställningen.

Analys och slutsats: Endast 17 av 977 företag hade tillämpat det nya regelverket. Av empirin och analysen framkommer att det fanns vissa mindre skillnader mellan de som valt att tillämpa K2 eller inte. Men inte något som kan klassas som urskiljande karakteristik för gruppen som tillämpade K2. Den enda variabeln som statistiskt gick att säkerställa var soliditet.

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Hui, Ip Kee. "Analysis of surface mount technology solder joints". Thesis, Brunel University, 1996. http://bura.brunel.ac.uk/handle/2438/5380.

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The factors determining the quality of surface mount technology (SMT) solder joints are numerous, and complex. The exploration of these factors, and how they may affect the reliability and quality of the joints can only be achieved through continuous research. In this project, essential areas of SMT joints were selected for study and analysis, with the intention of providing additional design and process guidelines for the production of quality SMT joints. In the infrared reflow process, one of the common defect phenomena is the occurrence of tombstoning; that is after soldering only one end of the component is soldered while the other is lifted up, assuming a position like a tombstone. The initiation of tombstoning during reflow was analysed based on the forces acting on the component. A model was developed to predict the initiation of this phenomenon. The model shows that, under vibration-free conditions, the surface tension of the molten solder is the source of the force causing the initiation of tombstoning. The contact angle, which varies with the length of the printed circuit board solder land, has a significant effect on the value of the surface tension acting as a force pulling upward on the component. The model further shows that tombstoning initiation is due to the combined effects of the surface tension; the weight of the component; the dimensions of the component; the length of the solder underneath the component; and the length of the solder protruding from the end of the component. Selected components were used as examples for predicting the conditions of initiation, and these conditions were further substantiated by a series of experiments. Another area of study was a method which directly pulled the components off printed circuit boards and this was used as a means for testing the bond quality of surface mount technology leadless chip solder joints. Components D7243, CC1206, RC1206, RC121O, and CC1 812 were selected for this study. It was found that the ultimate tensile force which breaks a component off the printed circuit board has the potential to be used as a parameter for measuring the quality of the solder joint. The effect of solder thickness on the strength of a joint has also been investigated. The shape of joints soldered by two methods, wave soldering and infrared reflow, were compared. Joints at the two ends of a component produced by infrared reflow were found more uniform than the ones produced by wave soldering. A recommendation is made here for the wave soldering approach in achieving uniform solder joints. The effects of solder shape on the joint strength were further investigated by finite element analysis. A convex joint was found marginally more robust than a concave joint. Two aspects of the internal structure of SMT solder joints were investigated, void content and copper/tin intermetallic compounds. The voiding conditions of wave-soldered and infrared reflow joints were compared. No voids were found in all specimens that were produced by wave soldering. However, there were always voids inside joints produced by infrared reflow. Microhardness tests indicated that the hardness of compounds at the copper/solder interface of infrared reflowed joints is lower than that in the wave-soldered joints. It is considered that the lower hardness of the interfacial region of the infrared reflowed joints is due to the presence of voids. Scanning electron microscopy was used to study the formation of copper/tin intermetallic compounds for joints produced by infrared reflow. The results show that Cu 6 Sn5 was the only compound with a detectable thickness. Other compounds such as Cu3 Sn, were virtually not found at all. Aging of the joints at 100°C, shows that both the Cu 6Sn5 and the overall interfacial thickness grew with time. One of the important areas which had been overlooked previously and was studied in some details was the effects of solder paste exposure on the quality of solder paste. The characteristic changes of solder paste due to exposure were investigated in three areas, weight loss, tackiness, and rheology. The evaporation of low boiling point solvents was considered as the main contribution to the loss in the weight of the solder paste. The weight loss against exposure time was found to follow an exponential behaviour. A method was designed to evaluate the tackiness changes of solder paste due to exposure. It was found that the decay of tackiness against exposure time can be expressed by a power law. It is recommended that solder paste manufacturers should provide the necessary characteristic constants so as to enable the characteristics to be calculated after a specific exposure. The rheological changes of the solder paste as a result of exposure were also investigated. The implication on the printability of the solder paste due to these changes was studied and discussed.

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Burke, Shaunna. "Mental strategies of elite Mount Everest climbers". Thesis, University of Ottawa (Canada), 2003. http://hdl.handle.net/10393/26453.

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Elite athletes use mental strategies in a wide variety of sports to enhance performance (Cancio, 1993; Orlick & Partington, 1999; Schomer, 1987; Tammen, 1996). High-level athletes have been found to use mental strategies before, during, and after competition (Orlick, 2000). Little research has been conducted to explore the mental strategies used by high altitude climbers. Elite high altitude climbers are a special population of athletes who perform in extremely adverse situations. The question of how these climbers prepare for the climb and what types of mental strategies they use to overcome obstacles on the mountain has not been addressed in the literature. The objectives of this study on the use of mental strategies by elite Mount Everest climbers were twofold: (a) to explore how elite Mount Everest climbers mentally prepared for the climb and (b) to explore the mental strategies they utilized to overcome obstacles on the mountain to successfully reach the summit. The main areas addressed include detailed planning, mental toughness, imagery, focus, short-term goal setting, drawing on past experiences, feeling support from other climbers, belief in personal capacities, and connecting with one's body. There were commonalities among the participants in terms of the application of these strategies but also uniqueness in the way each participant described the various mental strategies. The findings of this study provide valuable information that could help future high altitude climbers reach their goals, as well as expedition leaders and sport psychologists to work more effectively with climbers to prepare them for the climb and the potential obstacles that can hinder success on the mountain.

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Ongaro, Joel Nyanguya. "The vegetation of Mount Kenya (Chogoria Track)". Thesis, Lancaster University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360646.

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Bruns, Joel. "Dynamic Analysis of a Hydraulic Body Mount". The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu149407914091249.

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Artho-Bentz, Samuel S. "Telescope Parallel Actuator Mount: Control and Testing". DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2242.

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This thesis approaches the task of designing a control system for the Parallel Actuator Mount developed by Dr. John Ridgely and Mr. Garrett Gudgel. It aims to create a base framework that directly controls the telescope and can be expanded to accept external command. It incorporates lower priced components and develops more easily approachable software with great functionality. An open-loop method for velocity control is established. Developing repeatable tests is a major focus. Testing finds the control methods developed result in velocity error of less than 5% and position error of less than 1.5% despite several mechanical issues and inaccuracies. Design guidelines are established that allow for the easy implementation of a Parallel Actuator Mount on other systems. This paper proves that the Parallel Actuator Mount is a potentially viable system for aiming a telescope when an astronomer does not require full sky coverage. The tests showed too much error to fully recommend the system as built and tested, but there are paths to increase accuracy of the system without greatly increasing the complexity or cost. The inclusion of a method of feedback, including a plate solver and an inertial measurement unit, would greatly improve the system. It may also be of use to modify the software to include a variable time step for the velocity control.

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Perdue, James Patrick. "Modeling and simulation of surface mount packages". Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-07112009-040410/.

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Książki na temat "Mount"

Santella, Andrew. Mount Vernon. Minneapolis, Minn: Compass Point Books, 2005.

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O'Dwyer, Jerry. Mount Nephin. Leicester: (New Broom Press), 1986.

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Chester, D. K., A. M. Duncan, J. E. Guest i C. R. J. Kilburn. Mount Etna. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4079-6.

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Collins, Mary. Mount Vernon. New York: Children's Press, 1998.

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Mount, Andrew. Andrew Mount. London: The Showroom, 1996.

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Fite, Gilbert Courtland. Mount Rushmore. Keystone, SD: Mount Rushmore History Association, 2005.

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Klingel, Cynthia Fitterer. Mount Rushmore. Chanhassen, MN: Child's World, 2000.

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ill, Skeens Matthew, red. Mount Rushmore. Minneapolis, Minn: Picture Window Books, 2009.

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Jim, Love, i Rhyne Charles A, red. Mount Holly. Charleston, S.C: Arcadia Publishing, 2011.

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MONTAGUE, John. Mount eagle. Winston-Salem, N.C: Wake Forest University Press, 1989.

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Części książek na temat "Mount"

Weik, Martin H. "mount". W Computer Science and Communications Dictionary, 1047. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_11834.

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Vita-Finzi, Claudio. "Mount Carmel". W Encyclopedia of Geoarchaeology, 539–41. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-1-4020-4409-0_99.

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van der Kruit, Pieter C. "Mount Wilson". W Pioneer of Galactic Astronomy: A Biography of Jacobus C. Kapteyn, 170–201. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-55423-1_9.

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Voller, Ronald L. "Mount Wilson". W The Muleskinner and the Stars, 25–63. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4939-2880-4_3.

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van der Kruit, Pieter C. "Mount Wilson". W Jacobus Cornelius Kapteyn, 453–500. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-10876-6_13.

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Kayastha, Rijan B. "Mount Everest". W Encyclopedia of Earth Sciences Series, 756–57. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-90-481-2642-2_363.

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Mahaney, William C. "Mount Kenya". W Encyclopedia of Earth Sciences Series, 758–61. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-90-481-2642-2_668.

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Weik, Martin H. "antenna mount". W Computer Science and Communications Dictionary, 54. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_720.

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Huadong, Guo. "Mount Wutai". W Atlas of Remote Sensing for World Heritage: China, 228–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-32823-7_32.

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Huadong, Guo. "Mount Taishan". W Atlas of Remote Sensing for World Heritage: China, 236–45. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-32823-7_33.

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Streszczenia konferencji na temat "Mount"

Zheng, Ling, Woojin Jung, Zheng Gu i A. Baz. "Passive Periodic Engine Mount". W ASME 2008 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/detc2008-49523.

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The transmission of automotive engine vibrations to the chassis is isolated using a new class of mounts which rely in their operation on optimally designed and periodically distributed viscoelastic inserts. The proposed mount acts as mechanical filter for impeding the propagation of vibration within specific frequency bands called the ‘Stop Bands’. The spectral width of these bands is enhanced by making the viscoelastic inserts operate in a shear mode rather than compression mode. The theory governing the operation of this class of periodic mounts is presented using the theory of finite elements combined with the transfer matrix approach. The predictions of the performance of the mount are validated against the predictions of the commercial finite element code ANSYS and against experimental results obtained from prototypes of plain and periodic mounts. The obtained results demonstrate the feasibility of the shear mode periodic mount as an effectiveness means for blocking the transmission of vibration over a broad frequency band. Extending the effective width of the operating frequency bands of this class of mount through active control means is the ultimate goal of this study.

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Nguyen, The, Constantin Ciocanel i Mohammad Elahinia. "Modeling and Simulation of a Magnetorheological Mount". W ASME 2008 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/detc2008-50130.

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Magnetorheological (MR) mounts have been developed to replace hydraulic mounts because the MR effect makes the mount controllable and more adaptive. An MR mount, except for the added damping due to magnetic field, operates similarly with a hydraulic mount. Therefore, the geometry of the flow paths (inertia tracks) and the distribution of the magnetic field across these paths affect significantly the mount behavior. In this study, different geometries for the flow paths of an MR mount, designed to operate in flow mode, are considered and their effect on the mount behavior is simulated. The effects of the different geometries considered are quantified through changes in displacement transmissibility of the mount over a 0 to 70 Hz frequency range. The results of the analysis provide useful insights about model parameter values and contribute to the successful design of the flow mode operating MR mount.

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Anderson, Walter, Constantine Ciocanel i Mohammad Elahinia. "A Geometric Parametric Analysis of a Magnetorheological Engine Mount". W ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/detc2010-28941.

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Engine vibration has caused a great deal of research for isolation to be performed. Traditionally, isolation was achieved through the use of pure elastomeric (rubber) mounts. However, with advances in vehicle technology, these types of mounts have become inadequate. The inadequacy stems from the vibration profile associated with the engine, i.e. high displacement at low frequency and small displacement at high frequency. Ideal isolation would be achieved through a stiff mount for low frequency and a soft mount for high frequency. This is contradictory to the performance of the elastomeric mounts. Hydraulic mounts were then developed to address this problem. A hydraulic mount has variable stiffness and damping due to the use of a decoupler and an inertia track. However, further advances in vehicle technology have rendered these mounts inadequate as well. Examples of these advances are hybridization (electric and hydraulic) and cylinder on demand (VCM, MDS & ACC). With these technologies, the vibration excitation has a significantly different profile, occurs over a wide range of frequencies, and calls for a new technology that can address this need. Magnetorheological (MR) fluid is a smart material that is able to change viscosity in the presence of a magnetic field. With the use of MR fluid, variable damping and stiffness can be achieved. An MR mount has been developed and tested. The performance of the mount depends on the geometry of the rubber part as well as the behavior of the MR fluid. The rubber top of the mount is the topic of this study due to its major impact on the isolation characteristics of the MR mount. To develop a design methodology to address the isolation needs of different hybrid vehicles, a geometric parametric finite element analysis has been completed and presented in this paper.

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Fakhari, V., H. A. Talebi i A. R. Ohadi. "A Robust Active Vibration Control of Automotive Engine". W ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-24834.

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In this study, the effectiveness of an active engine mount in vibration suppression of a four-cylinder V-shaped engine is evaluated. In this regard, a 6 degree of freedom engine model under inertia and balancing mass forces and torques is considered. At first, the governing equations of motion of engine supported by three rubber mounts are presented. Subsequently, one of the rubber mounts is replaced by an active mount and the effectiveness of active mount, in the presence of sensor noise, in vibration isolation of the engine is investigated. Two robust control algorithms, namely H2 and H∞ schemes are employed to provide control input using feedback from accelerations of the engine body in the position of the mounts. Moreover, unstructured uncertainties due to the unmodeled dynamic of the plant, actuator and sensors are considered. Simulation results show that the active mount is more effective than the rubber mount in vibration suppression of the engine.

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Jiang, Dongying, Yushun Cui, Zheng-Dong Ma i Rod Hadi. "A Systematic Approach for Optimal Mounting System Design of Truck Body". W ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81269.

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Body mount system is utilized for isolating dynamic load and vibration into the cab from the rest of vehicle system. The behavior of the mount system not only depends on the performance of individual mounts but also on the complete system configuration. A systematic approach is proposed for optimal design of the truck body mount system. Design variables include the mount locations and mechanical properties of each individual mount. First, an advanced component mode-based substructuring method is utilized for developing reduced-order models of the cab body and the other related subsystems, such as the chassis frame, from the original detailed finite element models. An optimization procedure is then developed, which can be used to determine the geometric distribution of the mounts and their mechanical characteristics (e.g., dynamic stiffness and damping) for minimizing vibration amplitudes at the given locations in the body structure over a frequency range of interest. To determine the optimal mount distribution, a path variable is introduced at the interface of cab and frame, which allows each individual mount moving along the chassis frame in the permitted range. The optimal mount location design problem is thus transformed to an equivalent problem that determines the optimal path variables of each mount. MATLAB codes are developed for the mount system design problem. An example mount system design is given to illustrate the effectiveness and efficiency of the proposed approach, in which the mount stiffness and the mount locations are optimized simultaneously. The developed optimization tool can be extended for optimizing other general mounting systems, such as an engine mount system.

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Vahdati, Nader, i Somayeh Heidari. "Development of an Electromagnetic Active Engine Mount". W ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-53511.

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Engine mounts need to satisfy three design requirements: (1) firmly support engine weight, (2) isolate structure from the engine’s noise and vibration, and (3) control engine motion when large shocks or engine resonances are present. In addition to these three criteria, which are common for designing all types of engine mounts (passive, semi-active, and active), two more design requirements need to be satisfied for active engine mounts. First, they should be designed such that if there is any malfunction with the actuator, the controller, or the sensors, the active engine mount should still safely operate as a passive mount. Second, the power consumption, the size and weight of the required actuator and its controller should be kept as low as possible. The current paper aims to present an active hydraulic (or fluid) engine mount design by using an electromagnetic actuator and capacitive circuit such that it is able to act as a passive mount, semi-active mount, and an active mount. In addition, the presented design has the capability to be converted to a damper as and when needed. The multi-functional capability of the proposed engine mount design (passive, semi-active, active, and damper) distinguishes the current design from the previously designed active engine mounting systems, and this multi-functional capability is explained in the paper. The proposed design consists of a conventional passive hydraulic (fluid) mount, an electromagnetic actuator (voice coil) and a capacitive circuit. The voice coil is placed in the lower chamber of the passive hydraulic mount and it can change the volumetric stiffness of the bottom chamber actively such that the engine mount has low dynamic stiffness in a wide range of frequencies. The capacitive circuit is paralleled with the voice coil and in situations when large shock inputs are present; it adds capacitance to the electromagnetic circuit and changes the characteristics of the mount from an isolator to a damper. Since the active engine mount design of this paper involves several energy domains, bond graph modeling technique is used for mathematical modeling. MATLAB simulation results are shown for an automotive application and the performance of the proposed active engine mount design is evaluated as an isolator and as a damper. Finally, an adaptive controller, based on Filtered-X LMS algorithm, is proposed and its performance is investigated. The proposed design can eliminate transmitted force from the engine to the structure in a frequency range of 15 Hz to 125 Hz.

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Nguyen, The, Mohammad Elahinia i Constantin Ciocanel. "A Magnetorheological Mount for Hydraulic Hybrid Vehicles". W ASME 2009 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2009. http://dx.doi.org/10.1115/smasis2009-1362.

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Advanced vehicular technologies have been increasingly popular since they improve fuel economy. Automobiles with variable cylinder management are capable of turning on/off the cylinders in order to optimize the fuel consumption. Hybrid vehicles such as hybrid electric vehicles (HEVs) or hydraulic hybrid vehicles (HHVs) allow the engines to operate in the most efficient region. Besides, the hybrid technology includes capturing the braking energy, otherwise wasted as heat, to aid the acceleration. However, the enhancement in fuel efficiency comes with unbalance, shock and wider range of frequency vibration. Noise and vibration is actually one of the main obstacles in commercializing the HHV technology. This study is to design a vibration isolator to work for HHVs effectively and economically. The vibration profile of HHVs is proven to include both shock load at the switches of power sources and wide frequency range of vibration. That the HHV’s engine is turned on/off frequently and the hydraulic pumps/motors operate between 0 and 2000RPM, corresponding to 0–300Hz, poses difficult challenges for the isolation system. Rubber mounts are cheap, but only good for static load support and suitable for low power engine. Passive hydraulic mounts are only effective for conventional engines with unvarying working schedules. On the other hand, the active mounts are responsive for any condition, but too costly for commercial vehicles. Semi-active mounts with magnetorheological fluid (MRF) have been researched and recognized as a highly potential solution for hydraulic hybrid vehicles. The semi-active MRF mount is constructed very similar to a conventional hydraulic mount. However, the working fluid is an MRF which can quickly change its characteristics when the magnetic field is present. The main features of the MRF mount include multiple controllable MR valves, utilizing the flow (valve) mode, to connect the top and bottom fluid chambers. In addition, the mount is also capable of employing the fluid in squeeze mode. The structure of the MRF mount allows the stiffness and damping to be controlled in real time. The controllability makes the mount tunable to particularly fit the requirements of the HHVs. In this study, a mathematical model was constructed to predict the performance of the mount. The parameters were tuned so that the mount is effective within the whole operating frequency range of the HHV’s vibration.

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Byam, Brooks P., i Clark J. Radcliffe. "Statistical Energy Analysis Model and Connectors for Automotive Vibration Isolation Mounts". W ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0465.

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Abstract Consumer comfort is a top priority in today’s vehicle design. Reduction of noise and vibration enhances comfort and improves the overall quality of the vehicle. Linear elastic vibration isolation mounts are traditionally applied within complex structures to combat noise and vibration. Statistical Energy Analysis (SEA) is becoming an established and tested noise and vibration modeling methodology that is frequently used to model the flow of noise and vibration in complex structures. A SEA model of a linear elastic vibration isolation mount is developed here which enables SEA analysis of elastically isolated systems for the first time. A vibration isolation mount model has been absent from SEA models because of the lack of an SEA formulation. Linear elastic vibration isolation mount SEA equations are developed here for the first time. The basis of SEA theory is energy sharing among vibrational mode groups. Traditionally, vibration isolation mounts were thought of as compliant elements with no modes suitable to SEA analysis. An example mount is defined and the number of energy storage modes computed. The results show that a linear elastic vibration isolation mount should be modeled in SEA analysis and provide the equations for a SEA isolation mount model. Also included is the analysis for three unique SEA connectors, a mount to acoustic volume connector, a beam to mount connector, and a mount to flat plate connector.

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Ohadi, A. R., i G. Maghsoodi. "Simulation of Engine Vibration on Nonlinear Hydraulic Engine Mounts". W ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-85684.

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In this paper, vibration behavior of engine on nonlinear hydraulic engine mount including inertia track and decoupler is studied. In this regard, after introducing the nonlinear factors of this mount (i.e. inertia and decoupler resistances in turbulent region), the vibration governing equations of engine on one hydraulic engine mount are solved and the effect of nonlinearity is investigated. In order to have a comparison between rubber and hydraulic engine mounts, a 6 degree of freedom four cylinders V-shaped engine under inertia and balancing masses forces and torques is considered. By solving the time domain nonlinear equations of motion of engine on three inclined mounts, translational and rotational motions of engines body are obtained for different engine speeds. Transmitted base forces are also determined for both types of engine mount. Comparison of rubber and hydraulic mounts indicates the efficiency of hydraulic one in low frequency region.

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Wang, Shuo, The Nguyen, Walter Anderson, Constantin Ciocanel i Mohammad Elahinia. "Skyhook Control of a Mixed Mode Magnetorheological Fluid Mount". W ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/detc2010-28553.

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Magnetorheological (MR) fluid mounts have their own advantages over the hydraulic mounts because they can provide extra damping and stiffness due to the MR effect. Many papers contribute to the control of MR fluid dampers, while very few papers focus on the control of MR mounts. This paper investigated skyhook control for a mixed mode MR fluid mount. The MR fluid mount can operate in two working modes: flow mode and squeeze mode. The skyhook control algorithms were developed and studied for the flow mode and squeeze mode separately and simultaneously. Simulation results show that the skyhook control can significantly reduce the resonance peak and achieve the lowest transmissibility in the whole working frequency range of the mount. When flow mode and squeeze mode are activated and controlled at the same time, the effect of squeeze mode is more obvious than that of the flow mode.

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Raporty organizacyjne na temat "Mount"

Bjorklund, M., i L. Lhotka. YANG Schema Mount. RFC Editor, marzec 2019. http://dx.doi.org/10.17487/rfc8528.

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Lane, L. S. Geology, Mount Joyal, Yukon. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2013. http://dx.doi.org/10.4095/290068.

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Lane, L. S. Geology, Mount Joyal, Yukon. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2013. http://dx.doi.org/10.4095/292735.

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Newberry, R. J. The Mount Fairplay igneous complex. Alaska Division of Geological & Geophysical Surveys, czerwiec 2020. http://dx.doi.org/10.14509/30463.

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James, Matthew, Bailey Peterson i Erika Roeber. Mount Rushmore Visitor Services Redevelopment. Landscape Architecture Foundation, 2015. http://dx.doi.org/10.31353/cs0960.

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McMechan, M. E., i N. W. Rutter. Geology, Mount Selwyn, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/122789.

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Thompson, R. I., D. Noakes, R. Day, S. Trollope i N. Godfrey. Geology, Mount Robb, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1987. http://dx.doi.org/10.4095/123654.

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Thompson, R. I., D. Noakes, R. Day, S. Trollope i N. Godfrey. Geology, Mount Laurier, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1987. http://dx.doi.org/10.4095/123655.

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Holder, Nanette S. Solderability of Surface Mount Devices. Fort Belvoir, VA: Defense Technical Information Center, czerwiec 1993. http://dx.doi.org/10.21236/ada265751.

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Gilbert, H., J. Dettmer, G. Savard i H. Su. Mount Meager passive seismic monitoring. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2020. http://dx.doi.org/10.4095/326819.

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