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1
Khazrik, Jessica. "Mount Mound Refuse". Kohl: A Journal for Body and Gender Research 2, Summer (1 giugno 2016): 103–10. http://dx.doi.org/10.36583/kohl/2-1-11.
Testo completo
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Vahdati, Nader, e Mehdi Ahmadian. "Variable Volumetric Stiffness Fluid Mount Design". Shock and Vibration 11, n. 1 (2004): 21–32. http://dx.doi.org/10.1155/2004/751042.
Testo completoAbstract (sommario):
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, n. 04 (dicembre 2002): 341–45. http://dx.doi.org/10.1142/s0218539302000883.
Testo completoAbstract (sommario):
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., e R. Shoureshi. "Modeling and Implementation of Semi-Active Hydraulic Engine Mounts". Journal of Dynamic Systems, Measurement, and Control 110, n. 4 (1 dicembre 1988): 422–29. http://dx.doi.org/10.1115/1.3152706.
Testo completoAbstract (sommario):
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 e Sang Min Choi. "Vibration Control Performance of Active Mount System Featuring Inertial Piezostack Actuator". Advanced Materials Research 317-319 (agosto 2011): 573–76. http://dx.doi.org/10.4028/www.scientific.net/amr.317-319.573.
Testo completoAbstract (sommario):
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., e G. Maghsoodi. "Simulation of Engine Vibration on Nonlinear Hydraulic Engine Mounts". Journal of Vibration and Acoustics 129, n. 4 (9 aprile 2007): 417–24. http://dx.doi.org/10.1115/1.2748459.
Testo completoAbstract (sommario):
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 e Yeonjune Kang. "Evaluation of the Supporting Mounts of a Three-in-One Electric Drive Unit Using a Hybrid Simulation Model". Machines 11, n. 11 (16 novembre 2023): 1026. http://dx.doi.org/10.3390/machines11111026.
Testo completoAbstract (sommario):
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, e 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.
Testo completoAbstract (sommario):
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, e 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, n. 4 (28 giugno 2016): 374. http://dx.doi.org/10.14429/dsj.66.10211.
Testo completoAbstract (sommario):
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 e 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, n. 7 (1 febbraio 2023): 635–40. http://dx.doi.org/10.3397/in_2022_0086.
Testo completoAbstract (sommario):
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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Shangguan, Wen-Bin, Guo-feng Zheng, Tai-Kai Liu, Xiao-Cheng Duan e Subhash Rakheja. "Prediction of fatigue life of rubber mounts using stress-based damage indexes". Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 231, n. 8 (6 ottobre 2015): 657–73. http://dx.doi.org/10.1177/1464420715608407.
Testo completoAbstract (sommario):
Prediction of fatigue lives of a rubber mount necessitate formulation of models for estimating fatigue life of the rubber materials used in the mount. Moreover, the prediction accuracy of the model is strongly dependent upon the choice of damage index that are based on different strain, energy or stress measures in the vicinity of critical locations of the rubber mount. In this study, relative performance of models employing different damage indices are evaluated for prediction of fatigue lives of rubber material and a drive-train rubber mount. A combined stress and an effective stress function are proposed as a damage index for predicting fatigue lives of rubber materials and the mounts. Different damage indices, identified from the finite element models of the rubber dumbbell cylindrical specimen are applied for formulations of fatigue life prediction models. The model parameters are identified from the measured data acquired for the rubber dumbbell cylindrical specimen under 31 different uniaxial displacement loads, using least squared error minimization technique. The identified models employing different damage indices are subsequently applied for predicting fatigue lives of rubber mounts under different magnitudes of loads applied along two different directions. The correlations of the predicted lives of the rubber mount from the models employing different damage indices with measured fatigue life data were subsequently investigated for the rubber mount subject to different load conditions. It is shown that the models identified for the rubber material could be effectively used for predicting fatigue lives of the mounts, which are made of same material. The fatigue lives predicted by the models considering either effective stress or combined stress as the damage index correlated with the measured data within a factor of two for the two, suggesting that stress-based damage indices could yield more accurate predictions of fatigue lives of typical mounts.
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Guo, Zheng, Datong Qin, Antai Li, Jihao Feng e Yonggang Liu. "Analysis of the Influence of a Powertrain Mounting System on a Dual-Clutch Transmission Vehicle under Typical Working Conditions". Applied Sciences 12, n. 15 (25 luglio 2022): 7439. http://dx.doi.org/10.3390/app12157439.
Testo completoAbstract (sommario):
The unsuitably designed powertrain mount may cause jittering and shrugging during the starting and shifting processes of the vehicle, which seriously affects the comfort of using the vehicle. However, the influence of mounts on vehicles has been neglected in previous studies. In view of the above problems, this study establishes a DCT vehicle coupling dynamic model, considering six degrees of freedom of the powertrain mount and the engine dynamic torque, nonlinear characteristics of a dual-mass flywheel, time-varying stiffness of gear systems, and other factors. Furthermore, the effect of mounts on the longitudinal dynamic characteristics of the vehicle is studied during the starting, shifting, and tip-in/tip-out process. The results show that under typical working conditions, the mount and its stiffness and damping affect the fluctuation frequency and amplitude of the jerk. When the torque of the vehicle transmission system changes greatly, such as under starting and tip-in/tip-out conditions, the mount has a great impact on the dynamic performance of the vehicle. Simultaneously, the engine torque fluctuation can act on the vehicle through the mount, which has an impact on the jerk of the vehicle. A comparison with vehicle test results reveals that the DCT coupling dynamic model can reflect the law of the effect of the mount on the vehicle performance and verify the rationality of the model. Under typical working conditions, when the influence of the mount is not considered in the vehicle dynamic’s modeling, there is a large error of the jerk between the simulation results and the actual situation. The results provide a reference for optimizing the parameters of the mount and improving the dynamic characteristics of DCT vehicles.
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Xu, Zhi Jun, e Zeng Xin Yu. "Kinetic Analysis of Hydraulic Mount of Vehicular Engine Based on Fluid-Structure Interaction". Applied Mechanics and Materials 117-119 (ottobre 2011): 279–82. http://dx.doi.org/10.4028/www.scientific.net/amm.117-119.279.
Testo completoAbstract (sommario):
A fluid-solid interaction FEM of entire hydraulic mount of vehicular engine are presented. The dynamic response of the hydraulic mount is simulated. By means of the simulated result of the mount transient response in time domain, the dynamic performance and transmissibility of the hydraulic mounts are calculated. the ALE method transforming reference frames is used to resolve the problem the reference frame of hydro-dynamical questions is different from the reference frame of structural questions.
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Crosser, Andrea, Monica Snideman e Daniela Vazquez Klisans. "Determining Static Mount Accuracy with a Mid-Range Eye Tracker". Proceedings of the Human Factors and Ergonomics Society Annual Meeting 63, n. 1 (novembre 2019): 2249–53. http://dx.doi.org/10.1177/1071181319631357.
Testo completoAbstract (sommario):
Technological advances and decreases in cost have allowed eye trackers to become available to a wider range of industries. This research sought to examine the accuracy of a mid-range eye tracker while viewing small and large targets on two static mounts. Total dwell time was collected for 16 participants with the tripod-mount and laptop-mount. The results indicated that the size of the target significantly affects the accuracy, however the type of mount did not affect the accuracy. The findings indicate that either mount type can be used as long as defined Areas of Interest (AOI) are large enough for successful detection.
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Kim, J. J., e H. Y. Kim. "Shape design of an engine mount by a method of parametric shape optimization". Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 211, n. 2 (1 febbraio 1997): 155–59. http://dx.doi.org/10.1243/0954407971526326.
Testo completoAbstract (sommario):
In order to obtain an automatically designed shape of engine mount, the authors introduce the shape design process using the method of parameter optimization. The optimization code is developed and used with a commercial non-linear finite element program to determine the shape that satisfies the stiffness requirements of engine mounts. A bush type engine mount used in a passenger car is chosen for the application model. The stiffness of the optimized model along the principal direction is compared to the design specification of the mount. The shape obtained from the parameter optimization is considered to be acceptable. It can be seen that a well-defined parametric approach is successful in the design of the basic shape of engine mounts.
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Vahdati, Nader, e Mehdi Ahmadian. "Hybrid Secondary Suspension Systems". Shock and Vibration 16, n. 5 (2009): 467–80. http://dx.doi.org/10.1155/2009/624170.
Testo completoAbstract (sommario):
Passive fluid mounts are used in the fixed wing applications as engine mounts. The passive fluid mount is placed in between the engine and the fuselage to reduce the cabin's structure- borne noise and vibration generated by the engine.To investigate the benefits of passive fluid mounts used in conjunction with tuned vibration absorbers (TVA), a simple mathematical model is developed. This mathematical model includes the mathematical model of a passive fluid mount, a TVA, and a spring representing the fuselage structure. The simulation results indicate that when passive fluid mounts are used in conjunction with TVAs, an active suspension system behavior is nearly created.
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Dijkstra, Thomas, Peter Korsten e Jan Komdeur. "Is UV signalling involved in male-male territorial conflict in the blue tit (Cyanistes caeruleus)? A new experimental approach". Behaviour 144, n. 4 (2007): 447–70. http://dx.doi.org/10.1163/156853907780756030.
Testo completoAbstract (sommario):
Structurally-based ultraviolet (UV) coloration of plumage can signal male quality and plays a role in female mate choice in many bird species. UV-reflecting badges could also be important signals in male-male competition. We tested if territorial blue tit ( Cyanistes caeruleus ) males discriminate between conspecific male intruders which differ in the UV reflectance of their crown feathers. To this aim, we used a new experimental approach in which we simultaneously (instead of sequentially) introduced two male blue tit taxidermic mounts in the territories of resident males during the female fertile period; one mount with natural crown UV reflectance and one mount with reduced crown UV. The two mounts provoked strong aggressive reactions from resident males. Males specifically directed their aggression to conspecific intruders, as a male blue tit mount received substantially more aggression than a mount of a European robin ( Erithacus rubecula ). However, aggression of resident males did not vary between the UV-reduced and the control mount. Furthermore, the variation in natural crown UV reflectance of the resident males did not predict the intensity of their aggressive response. Contrary to previous findings our results suggest that UV signals play only a limited role in male-male interactions during territorial intrusions in the female fertile period.
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Ahmadian, Mehdi, e Brian M. Southern. "Isolation Properties of Low-Profile Magnetorheological Fluid Mounts". Fluids 6, n. 4 (19 aprile 2021): 164. http://dx.doi.org/10.3390/fluids6040164.
Testo completoAbstract (sommario):
This study evaluates the stiffness and damping characteristics of low-profile magnetorheological (MR) fluid mounts (MRFM) to provide a better understanding of the vibration improvements offered by such mounts, as compared with conventional elastomeric mounts. It also aims at assessing how much of the mount’s performance is due to the MR fluid and how much is due to the elastomer and steel insert that is used in MRFM. The study includes the design, analysis, fabrication, and testing of a unique class of MRFM that is suitable for the isolation of sensitive machinery and sensors. The MR fluid is compressed (squeezed) in response to dynamic force applied to the mount. The test results are compared with conventional elastomeric (rubber) mounts of the same configuration as MRFM, to highlight the changes in stiffness and damping characteristics for frequencies ranging from 1 to 35 Hz. With no current supplied, the MRFM has a slightly higher stiffness and nearly the same damping as a conventional rubber mount. The slight increase in MRFM stiffness is attributed to the MR fluid’s compressive stiffness, which is higher than the rubber. When current is supplied to the MRFM, the stiffness and damping increase significantly at lower frequencies and taper off to nearly the same level as the rubber mount at higher frequencies. Both the stiffness and damping are directly proportional to the supplied current. At the maximum current of 2 A, the MRFM has 200% higher stiffness and 700% higher damping than the rubber mount. The significantly higher damping and stiffness and the tapering off to nearly the same level as the rubber mount is quite interesting and intriguing. It indicates that MRFM delivers high damping and stiffness when needed, while significantly tapering them off when high damping and stiffness are not desirable.
19
Cairncross, Allan, David M. Flaherty e Ulrich Klabunde. "Tacky dot arrays for ordered particle mounting". Proceedings, annual meeting, Electron Microscopy Society of America 51 (1 agosto 1993): 716–17. http://dx.doi.org/10.1017/s0424820100149416.
Testo completoAbstract (sommario):
We describe for the first time a rapid way to mount particles on regularly spaced centers for microscopic examination. This innovative method mounts particles in ordered arrays rather than the random chaos of usual methods and therefore simplifies particle examination, identification and analysis. Advantages include the ability to easily mount single particles in controlled patterns and known locations, to mount tight clusters of 2 or more particles per center (Fig. 3); to repeatedly mount the same pattern/number of particles; to mount particles in unusual orientations (Fig. 5, 6) and to easily get the average weight of single particles. Examples of applications include mounting and examination of ores (Fig. 1), pollens (Fig. 2, 3), milled products, seeds (Fig. 4) and crystalline products(Fig. 5, 6).The mounting medium consists of a pattern of fine adhesive centers typically on 1 by 3 inch glass slides or on clear plastic film that is easily cut to any size or shape.
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Shiao, Yaojung, e Tan-Linh Huynh. "Suspension Control and Characterization of a Variable Damping Magneto-Rheological Mount for a Micro Autonomous Railway Inspection Car". Applied Sciences 12, n. 14 (21 luglio 2022): 7336. http://dx.doi.org/10.3390/app12147336.
Testo completoAbstract (sommario):
This paper aims to present a suspension control strategy for a semi-active mount with variable damping utilizing a smart magneto-rheological fluid (MRF), which will be applied in a micro autonomous railway inspection car as a primary suspension to protect the inspection equipment from the large suspension vibration on rails. We proposed a new multi-pole structure design for a semi-active magneto-rheological mount (MR mount) that can provide both a high damping force and a wide damping force band. Firstly, the mathematical model of MR mount dynamics was derived; secondly, a skyhook control strategy was developed for the MR mount; and finally, a dynamic simulation problem using Matlab software was constructed to evaluate the performance of the MR mount. The dynamic simulation results showed that the proposed MR mount using a skyhook control strategy showed greater vibration isolation performance compared to conventional passive mounts. In particular, the absolute displacement, velocity, and acceleration of the detector device were reduced by 83.33%, 77%, and 70%, respectively. The suspension vibration transmitted to the inspection device also decreased significantly, compared to input oscillation (i.e., un-sprung mass oscillation). Specifically, the suspension vibration reduced by a half at the excitation frequency of 2-fold the natural frequency and by greater magnitudes at higher excitation frequencies.
21
Mashayekhi, Mohammad Jalali, e Nader Vahdati. "Application of Tuned Vibration Absorbers in Fluid Mounts". Shock and Vibration 16, n. 6 (2009): 565–80. http://dx.doi.org/10.1155/2009/672394.
Testo completoAbstract (sommario):
The need to reduce the fuel consumption of vehicles leads to having lighter chassis’ with lighter engines yet maintaining engine power. These new design requirements are in contrast with the vibration isolation requirements. To keep the vehicles light yet provide good cabin noise and vibration isolation, requires a new vibration isolation technology. Fluid mounts have been used in the aerospace and the automotive industry to provide cabin noise and vibration reduction for years. With the use of passive fluid mounts, the highest cabin noise and vibration reduction is achieved at a frequency called “Notch Frequency”. But typical passive fluid mounts have only one notch frequency. So the best cabin noise and vibration reduction is only achievable at one frequency. In this paper, a new fluid mount design in combination with a tuned vibration absorber is proposed. Bond graph modelling technique is used to model the new fluid mount design. The physical model and simulation results are presented. The effect of the natural frequency of the TVA on the dynamic stiffness of the fluid mount is studied.
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Tee, G. J. "Relics of Davy and Faraday in New Zealand". Notes and Records of the Royal Society of London 52, n. 1 (22 gennaio 1998): 93–102. http://dx.doi.org/10.1098/rsnr.1998.0037.
Testo completoAbstract (sommario):
In April 1997 Sir John Meurig Thomas, F.R.S., toured New Zealand, as the 1997 Rutherford Lecturer of the Royal Society of London. He delivered his Rutherford Lecture on Sir Humphry Davy, P.R.S. (1778–1829), and Michael Faraday, F.R.S. (1791–1867), the first and second Directors of the Royal Institution. Many place–names in New Zealand commemorate scientists. There is Mount Davy (1012 m) at 42°23'S, 171°23'E, between Greymouth and Blackball. Mount Faraday, at 42°03'S, 171°30'E, is the highest peak (1485 m) in the Paparoa Range (south of Westport), whose successive peaks from south to north are named Mounts Lodge, Ramsay, Dewar, Priestly, Faraday, Curie, Einstein, Euclid and Kelvin. And Mount Copernicus and Mount Galileo are 10 km east of the Paparoa Range.
23
Moon, Seok-Jun, Jeong-Seok Kwak, Jung-Hoon Chung, Yong-Jin Ji, Jeong-Sik Yoon, Seung-Bok Choi, Hyun-Yup Lee, Woo-Jin Jung e Dock-Jong Ki. "A Study on the Hybrid Mount against Vibration and Shock for Naval Ships". Shock and Vibration 17, n. 3 (2010): 269–83. http://dx.doi.org/10.1155/2010/390453.
Testo completoAbstract (sommario):
In naval ships, some methods or devices are acquired both to cut off the transmission of vibration from shipboard machineries and to protect them from external shock loading. One of the approaches is to install the passive mountings between machinery and a flexible supporting structure. More advanced performance has become necessary recently so far as at high frequencies in order to retain the stealth function of certain types of naval vessels.For the purpose of this research, a novel hybrid mount for shipboard machinery installed on naval ships was developed. The mount is combined with a rubber mount and piezostack actuators. The rubber mount is one of the most popular and effective passive mounts to have been applied to various vibration systems to date. The piezostack actuator is featured by a fast response time, small displacement and low power consumption. Through a series of experimental tests conducted in accordance with MIL-M-17185A(SHIPS), MIL-M-17508F(SH), and MIL-S-901D which are US military specifications related to the performance requirements of the mount, it has been confirmed that the hybrid mount shows more effective performance for use in naval ships.
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Sunjana, Dani. "GUNUNG SEBAGAI LOKASI SITUS-SITUS KEAGAMAAN DAN SKRIPTORIA MASA SUNDA KUNO". PURBAWIDYA: Jurnal Penelitian dan Pengembangan Arkeologi 8, n. 2 (29 novembre 2019): 101–16. http://dx.doi.org/10.24164/pw.v8i2.305.
Testo completoAbstract (sommario):
This research aimed to reconstruct the concept, value, and implication of mount as sacred landscape in Ancient Sunda period. The research used bibliographical method which combine the information interpretation from secondary philology and epigraphical sources with previous done archaeological researches. The result shows that mount and mountain in general used as a sacred and holy landscape in Ancient Sunda period. This conception then represented by the existence of religious sites and scriptoria at the mount as a symbol to decrease the spiritual and intelectual distance with the deities and Supreme Being. Several mounts has been mentioned on written sources and need further archaeological research as a crosscheck confirmation in the future.
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Lin, Zhihong, e Mingzhong Wu. "Dynamic characterization of controlled multi-channel semi-active magnetorheological fluid mount". Mechanical Sciences 12, n. 2 (6 agosto 2021): 751–64. http://dx.doi.org/10.5194/ms-12-751-2021.
Testo completoAbstract (sommario):
Abstract. In this paper, a novel structure of a controlled multi-channel semi-active magnetorheological (MR) fluid mount is proposed, including four controlled channels and one rate-dip channel. Firstly, the magnetic circuit analysis, rate-dip channel optimization design, and MR fluid mount damping analysis are given. Secondly, the mathematical model of the controlled multi-channel semi-active MR fluid mount is constructed. We analyze the effect of controlled multi-channel closing on the dynamic characteristics of the mounts and the effect of the presence or absence of the rate-dip channel on the low-frequency isolation of the mount. Finally, the controlled multi-channel semi-active MR fluid mount was applied to the 1/4 vehicle model (a model consisting of an engine, a single engine mount, a single suspension and a vehicle frame), with the transmissibility of the engine relative to the vehicle frame at low frequency and the transmissibility of the engine reciprocating unbalanced force to the vehicle frame magnitude at high frequency as the evaluation index. Numerical simulation shows the following points. (1) The controllable multi-channel semi-active MR fluid mount can achieve adjustable dynamic stiffness and damping with applied 2 A current to different channels. (2) With known external excitation source, applied currents to different controllable channels can achieve the minimum transmissibility and meet the mount wide-frequency vibration isolation requirement, while adding a rate-dip channel can improve the low-frequency vibration isolation performance of the MR fluid mount. (3) Switching and closing different controllable channels in the 1/4 vehicle model can achieve the minimum transmissibility of low-frequency engine vibrations relative to the vehicle frame and high-frequency engine vibrations reciprocating an unbalanced force to the vehicle frame. Therefore, the design of the controllable multi-channel semi-active MR fluid mount can meet the wide-frequency isolation.
26
Yu, Yunhe, Saravanan M. Peelamedu, Nagi G. Naganathan e Rao V. Dukkipati. "Automotive Vehicle Engine Mounting Systems: A Survey". Journal of Dynamic Systems, Measurement, and Control 123, n. 2 (9 giugno 1999): 186–94. http://dx.doi.org/10.1115/1.1369361.
Testo completoAbstract (sommario):
This study divided into three portions to provide performance requirements; overview and development of various engine mounts; and the optimization of engine mount systems. The first part provides an insight about the ideal engine mount system that should isolate vibration caused by engine disturbance force in various speed range and prevent engine bounce from shock excitation. This implies that the dynamic stiffness and damping of the engine mount should be frequency and amplitude dependent. Therefore, the development of engine mounting systems has mostly concentrated on improvement of frequency and amplitude dependent properties. The second part starts discussion on the conventional elastomeric mounts that offer a trade-off between static deflection and vibration isolation. The next level, passive hydraulic mounts can provide a better performance than elastomeric mounts especially in the low frequency range. Subsequently, semi-active and active techniques are used to improve performance of hydraulic mounts by making them more tunable. The active engine mounting system can be very stiff at low frequency and be tuned to be very soft at the higher frequency range to isolate the vibration. The final part is about the optimization of engine mounting systems. An overview of the current work on this optimization shows some limitations. Further study is needed to consider the nonlinearities and variations in properties of different types of mounting systems.
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Shin, Yun-ho, Seok-jun Moon, Woo-jin Jung e Soo-ryong Bae. "Experimental Approach to Active Mounts Using Electromagnetic Actuator and Rubber with Consideration of Shock Resistance for Naval Shipboard Equipment". Shock and Vibration 2019 (16 aprile 2019): 1–15. http://dx.doi.org/10.1155/2019/3958359.
Testo completoAbstract (sommario):
There is demand for stringent vibration isolation within machine installations in order to achieve maximum performance or to satisfy otherwise extreme criteria, particularly, when there is a strong source of vibration such as a motor pump. It is frequently necessary to prevent the transmission of these vibrations to other parts of the system for passenger comfort in vehicles, ships, trains, etc., or for the protection of delicate electronic equipment. In the defense sector, the need for equipment which is better at avoiding detection has led researchers to focus more on improving vibration isolation. In this paper, an active mount combined with a passive rubber mount and an electromagnetic actuator is proposed and examined for use in naval shipboard equipment. The electromagnetic actuator is suggested for improving performance and overcoming its inherent limitations which are caused by the friction between the magnet and coil. The design specifications of an active mount, such as required force, displacement, and frequency characteristics, are identified for the self-excited pump system, and then an electromagnetic actuator active mount is redesigned with considering the shape of the passive rubber mount and shock resistance. The performance was examined on the single active mount using an external exciter, which could be simplified as two-degree-of-freedom system, and also confirmed experimentally on an active mount system with four mounts using a motor system. From the results of applying the proposed electromagnetic active mount, a vibration reduction of about 20 dB for the motor equipment was observed for the excited frequency components of 1,600 rpm and its two harmonic components.
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Bian, Jing, Xingjian Jing e Yishen Tian. "An innovative X-shaped vibration isolation mount with tunable quasi-zero-stiffness property". INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, n. 3 (1 agosto 2021): 3011–22. http://dx.doi.org/10.3397/in-2021-2284.
Testo completoAbstract (sommario):
Passive vibration isolation is always preferable in many engineering practices. To this aim, an innovative, compact, and passive vibration isolation mount is studied in this paper. The novel mount is adjustable to different payloads due to a special oblique and tunable stiffness mechanism, and of high vibration isolation performance with a wider quasi-zero-stiffness range due to the deliberate employment of negative stiffness of the X-shaped structure. The X-shaped structure has been well studied recently due to its excellent nonlinear stiffness and damping properties. In this study, by using of the negative stiffness property within the X-shaped structure, the X-shaped mount (X-mount) can have an obviously larger vibration displacement range which maintains the quasi-zero-stiffness property. A special oblique spring is thus introduced such that the overall equivalent stiffness can be much easily adjusted. Systematic parametric study is conducted to reveal the critical design parameters and their relationship with vibration isolation performance. A prototype and experimental validations are implemented to validate the theoretical results. It is believed that the X-mount would provide an innovative technical upgrade to many existing vibration isolation mounts in various engineering practices and it could also be the first prototyped mount which can offer adjustable quasi-zero stiffness conveniently.
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Kim, Changwon, e Chan-Jung Kim. "Tuning of Two Sub-Mounts in Mass-Block Integrated Mount Module over Self-Excitation and Basement Input". Applied Sciences 13, n. 18 (9 settembre 2023): 10159. http://dx.doi.org/10.3390/app131810159.
Testo completoAbstract (sommario):
If an unexpected vibration or force is expected to be generated during operation, a vibration mount must be installed beneath the support system. A mass-block can be considered to reduce the structure basement fundamental frequency of the basement. Thus, the efficiency of a single-mount or mass-block can be enhanced by implementing a single-mount module called a mass-block integrated mount module (MIMM). This study addressed the tuning process of multiple mount modules in a supported system by evaluating the mount module using the proposed total performance index, building on a previous evaluation method comprising the first and second performance indices. This index was subsequently applied to assess the control capability of MIMM concerning both the self-excitation of an electric power plant and basement input. The extended 3-degrees-of-freedom (3-d.o.f.) electric power generator model was applied to determine the best selection of the mechanical properties for the MIMM over the various mechanical parameter settings (ranging between 10 and 1000% of the original parameters) of the two sub-mounts. The simulation results demonstrate a reduction in the total performance index from 8.2, as calculated in a previous study, to 0.2. The novelty of the optimal MIMM conditions is confirmed by the simultaneous enhancement of both performance indices.
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Xin, Fu-Long, Li-Jun Qian, Hai-Ping Du e Wei-Hua Li. "Multi-objective robust optimization design for powertrain mount system of electric vehicles". Journal of Low Frequency Noise, Vibration and Active Control 36, n. 3 (10 luglio 2017): 243–60. http://dx.doi.org/10.1177/0263092317719635.
Testo completoAbstract (sommario):
A multi-objective robust optimization scheme for the powertrain mount system of an electric vehicle is proposed in this paper. A permanent magnet synchronous motor model is established by taking account of the effects of magnetic saturation and space harmonics, in which the d–q-axis inductance and the flux linkage excited by permanent magnet were obtained by finite element method. The rippled output torque of the permanent magnet synchronous motor mixed with harmonic components is obtained with the New European Driving Cycle as the running condition of the electric vehicle. A six degree-of-freedoms (DOFs) powertrain mount system is established and the response of the system is obtained with the rippled torque as the excitation input. A multi-objective optimization model of the powertrain mount system is built with the stiffness’s of the mounts as the design variables, and with the goal of maximizing the decoupling rates and minimizing the dynamic reaction forces of the mounts acting on the car body. Genetic algorithm is used to conduct the global optimization and all the Pareto optimal solutions are found out based on the optimization theory, and the solution with the optimal robustness of dynamic reaction force is obtained by Latin hypercube sampling method. The results show that with the proposed multi-objective robust optimization scheme applied for the parameters optimization of the motor mount system, the decoupling rates increase obviously, the dynamic reaction force decreases apparently, and the optimization result shows good robustness. The optimization results can make the powertrain mount system of electric vehicles processing of optimal dynamic response characteristics correspondingly.
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Romoli, Filippo, Estelle Mossou, Maxime Cuypers, Peter van der Linden, Philippe Carpentier, Sax A. Mason, V. Trevor Forsyth e Sean McSweeney. "SPINE-compatible `carboloops': a new microshaped vitreous carbon sample mount for X-ray and neutron crystallography". Acta Crystallographica Section F Structural Biology Communications 70, n. 5 (15 aprile 2014): 681–84. http://dx.doi.org/10.1107/s2053230x14005901.
Testo completoAbstract (sommario):
A novel vitreous carbon mount for macromolecular crystallography, suitable for neutron and X-ray crystallographic studies, has been developed. The technology described here is compatible both with X-ray and neutron cryo-crystallography. The mounts have low density and low background scattering for both neutrons and X-rays. They are prepared by laser cutting, allowing high standards of production quality, the ability to custom-design the mount to specific crystal sizes and large-scale production.
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ERAWATI, NETY VIRGO, e SIH KAHONO. "Keanekaragaman dan Kelimpahan Belalang dan Kerabatnya (Orthoptera) pada Dua Ekosistem Pegunungan di Taman Nasional Gunung Halimun-Salak". Jurnal Entomologi Indonesia 7, n. 2 (28 settembre 2015): 100. http://dx.doi.org/10.5994/jei.7.2.100.
Testo completoAbstract (sommario):
A study on diversity and abundance of grasshopper and its relatives (Orthoptera) was conducted at two mountainous rainforest ecosystems (Mounts Kendeng and Botol) of Gunung Halimun-Salak National Park. A hundred meters of a line transect was used to sample and set up several insect traps (yellow pan, malaise, pit fall, bait pit fall, sweep net, and light traps), and insect sweepings as well. The light traps were set up at about fifty meters distance from the end of the sampling sites. A total individual collected by traps was combined on every comparable sampling site. Total individuals of the Orthoptera captured were 414; consisted of 25 species of 9 families. Both species diversity and number of families were higher at Mount Kendeng rather than Mount Botol. Number of species of each family usually similar except on family of Grillidae was much higher at Mount Kendeng. Species belong to Phasmidae was not recorded at Mount Kendeng, while species belong to both families of Gryllotalpidae and Tettigonidae were not captured at Mount Botol as well. Overal there was a difference in the species richness at each between. Shannon Diversity Index (H’) and evenness (E) were higher at Mount Kendeng (2.44 and 0.81) rather than Mount Botol (1.80 and 0.66). Similarity Index of Jaccard (Cj) and Sorenson (Cn) of both localities were similar (0.40 and 0.32). Herbivores were most dominant at both localities (Phasmidae, Tetrigidae, Acrididae, Gryllidae, dan Gryllotalpidae), followed by omnivores (Blattidae), scavenger (Gryllacrididae), and predator (Mantidae).
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Deng, Zhaoxue, Qinghua Yang e Xuejiao Yang. "Optimal design and experimental evaluation of magneto-rheological mount applied to start/stop mode of vehicle powertrain". Journal of Intelligent Material Systems and Structures 31, n. 8 (18 marzo 2020): 1126–37. http://dx.doi.org/10.1177/1045389x20910271.
Testo completoAbstract (sommario):
Magneto-rheological mount is one of the most effective vibration isolation devices for the vibration isolation system of vehicle powertrain. In this article, a flow type of magneto-rheological mount was proposed to control the vibration and the torque excitation of the engine when vehicle was in start/stop mode. A mathematical model for the flow type of magneto-rheological mount was formulated with consideration of the influence of current on magneto-rheological fluid viscosity and the relationship between liquid resistance effect and flow rate in damping gap. Then, a co-simulation optimal platform was developed by the Isight and the ANSYS, and the non-dominated sorting genetic algorithm II was used to optimize magnetic circuit. Subsequently, two prototypes of magneto-rheological mounts were manufactured according to the initial design and the optimal design model, and the dynamic performance test of magneto-rheological mount monomer and the vibration isolation performance test of the whole vehicle under start/stop mode were carried out, respectively. The experimental results showed that the controllability and the vibration isolation performance of the optimal design magneto-rheological mount were significantly improved compared with the initial design.
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Bucha, Jozef, Ján Danko, Tomáš Milesich, Tomáš Nemec e Ľuboš Magdolen. "Comparison of FEM Simulations of Rubber-Metal Mount Element". Strojnícky časopis - Journal of Mechanical Engineering 72, n. 1 (1 aprile 2022): 15–22. http://dx.doi.org/10.2478/scjme-2022-0002.
Testo completoAbstract (sommario):
Abstract Increasing of electric vehicles volume brings new challenges in NVH (noise, vibration and harshness) area. Presented paper deals with comparison of simulations of rubber-metal motor mount using finite element method. For the future work it is important to define static characteristics of rubber-metal mounts. It leads to study possibilities of simulations of rubber-metal mount in different software environment. Preparing of computational models are realized in MSC Marc and MSC Nastran. Results from simulations are compared to Abaqus simulation results.
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Sun, Guo Chun, Chun Hua Zhang e Hua Xin. "Active Engine Vibration Isolation Using Robust Control". Applied Mechanics and Materials 380-384 (agosto 2013): 504–7. http://dx.doi.org/10.4028/www.scientific.net/amm.380-384.504.
Testo completoAbstract (sommario):
This paper introduces a prototype active engine mount (AEM) system designed for commercial passenger, requiring a good engine vibration solation performance. The AEM consists of a conventional hydraulic engine mount and an internal electromagnetic actuator. The robust H controller was adopted to cancel out the force transmitted through the AEM. The vibration isolation performance tests were carried out by simulating the engine idle shake. The experimental result confirmed that can control unwanted vibration from the engine operation by using active mounts.
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Gambino, Salvatore, Pietro Armienti, Andrea Cannata, Paola Del Carlo, Gaetano Giudice, Giovanni Giuffrida, Marco Liuzzo e Massimo Pompilio. "Chapter 7.3 Mount Melbourne and Mount Rittmann". Geological Society, London, Memoirs 55, n. 1 (2021): 741–58. http://dx.doi.org/10.1144/m55-2018-43.
Testo completoAbstract (sommario):
AbstractMount Melbourne and Mount Rittmann are quiescent, although potentially explosive, alkaline volcanoes located 100 km apart in Northern Victoria Land quite close to three stations (Mario Zucchelli Station, Gondwana and Jang Bogo). The earliest investigations on Mount Melbourne started at the end of the 1960s; Mount Rittmann was discovered during the 1988–89 Italian campaign and knowledge of it is more limited due to the extensive ice cover. The first geophysical observations at Mount Melbourne were set up in 1988 by the Italian National Antarctic Research Programme (PNRA), which has recently funded new volcanological, geochemical and geophysical investigations on both volcanoes. Mount Melbourne and Mount Rittmann are active, and are characterized by fumaroles that are fed by volcanic fluid; their seismicity shows typical volcano signals, such as long-period events and tremor. Slow deformative phases have been recognized in the Mount Melbourne summit area. Future implementation of monitoring systems would help to improve our knowledge and enable near-real-time data to be acquired in order to track the evolution of these volcanoes. This would prove extremely useful in volcanic risk mitigation, considering that both Mount Melbourne and Mount Rittmann are potentially capable of producing major explosive activity with a possible risk to large and distant communities.
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Lazzeroni, John J., e Melinda K. Lazzeroni. "Motorcycle helmet microphone mount and plug mount". Journal of the Acoustical Society of America 85, n. 6 (giugno 1989): 2702. http://dx.doi.org/10.1121/1.397257.
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Race, Alan. "Book Review: Mount Fuji and Mount Sinai". Theology 88, n. 724 (luglio 1985): 318–20. http://dx.doi.org/10.1177/0040571x8508800428.
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Zielak, João César, Murilo Rorbacker, Rodrigo Gomes, Celso Yamashita, Carla Castiglia Gonzaga e Allan Fernando Giovanni. "In Vitro Evaluation of the Removal Force of Abutments in Frictional Dental Implants". Journal of Oral Implantology 37, n. 5 (1 ottobre 2011): 519–23. http://dx.doi.org/10.1563/aaid-joi-d-09-00106.1.
Testo completoAbstract (sommario):
The objective of the present work was to determine some force parameters for removal of an abutment from a dental implant in a frictional system (locking taper, 1.23 degrees). Ten implants of the same length (11 mm) and different diameters were selected, along with 10 straight abutments (13 mm length) with different diameters. Abutments were attached to implants without application of force. Fixation of the implant-abutment mount (IA) (repeated 1–5 times) was performed through the impact of a body weight (compression force, tapping) left from a known height. After each group of tappings, IA mounts were coupled with a tensile strength tester. The lowest removal value was found after the first tapping of mount #2 (83 N, implant diameter 3.3 mm/4.5 mm abutment diameter), and the highest removal value happened with mount #8 after the fifth tapping (420 N, 5.0 mm/5.5 mm). The force to remove IA mounts increased with the number of tappings and with the increase in abutment mass. Three activations (tappings) of the abutment were considered necessary to yield optimal stability, demonstrated by the large increase in removal force.
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Pandit, Shiv Kumar, e Ashish Shrivastava. "A Review on the Performance Analysis of Engine Bracket". SMART MOVES JOURNAL IJOSCIENCE 5, n. 9 (14 settembre 2019): 8–11. http://dx.doi.org/10.24113/ijoscience.v5i9.223.
Testo completoAbstract (sommario):
Engine mounts have an important function of containing firmly the power-train components of a vehicle. Correct geometry and positioning of the mount brackets on the chassis ensure a good ride quality and performance. As an FSAE car intends to be a high performance vehicle, the brackets on the frame that support the engine undergo high static and dynamic stresses as well as huge amount of vibrations. Hence, dissipating the vibrational energy and keeping the stresses under a pre-determined level of safety have been achieved by careful designing and analysis of the mount brackets.
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Veasilyev, A. V. "Investigation of Low-Frequency Noise, in Order to Reduce it During the Operation of Compressor Mounts". Ecology and Industry of Russia 27, n. 4 (12 aprile 2023): 50–55. http://dx.doi.org/10.18412/1816-0395-2023-4-50-55.
Testo completoAbstract (sommario):
Experimental researches of characteristic of low frequency noise and gas dynamic gas pressure pulsations were carried out on experimental compressor mount and in the real industrial conditions. It is shown that gas pressure pulsations are making the main contribution into forming of low frequency noise of compressor mount. New device of reduction of low frequency noise and dynamic pressure pulsations was suggested. The device is allowing us to reach simultaneous efficient reduction of noise and pressure pulsations during operation of compressor mounts and to reduce the risk of the accidents in industrial conditions.
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Vahdati, N. "A Detailed Mechanical Model of a Double Pumper Fluid Mount". Journal of Vibration and Acoustics 120, n. 2 (1 aprile 1998): 361–70. http://dx.doi.org/10.1115/1.2893839.
Testo completoAbstract (sommario):
Conventional passive elastomenc mounts have been used as noise and vibration isolators in the automotive and aircraft industries for many years. For even better noise and vibration isolation, passive fluid mounts have been replacing elastomeric mounts in both the automotive and aerospace industries during the past few years. With more increase in the popularity of fluid mounts, it is important to characterize the dynamics of the fluid mounts more accurately. Many papers have been published on the modeling of these devices, but mostly on single pumper fluid mounts. In this paper, we focus on double pumper fluid mounts. The intent of this paper is to develop a very detailed model of a double pumper fluid mount including all dampings.
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Tikani, Reza, Nader Vahdati e Saeed Ziaei-Rad. "Two-Mode Operation Engine Mount Design for Automotive Applications". Shock and Vibration 19, n. 6 (2012): 1267–80. http://dx.doi.org/10.1155/2012/651591.
Testo completoAbstract (sommario):
Hydraulic engine mounts are applied to the automotive applications to isolate the chassis from the high frequency noise and vibration generated by the engine as well as to limit the engine shake motions resulting at low frequencies. In this paper, a new hydraulic engine mount with a controllable inertia track profile is proposed and its dynamic behavior is investigated. The profile of the inertia track is varied by applying a controlled force to a cylindrical rubber disk, placed in the inertia track. This design provides a hydraulic engine mount design with an adjustable notch frequency location and also damping characteristics in shake motions. By using a simple control strategy, the efficiency of the proposed hydraulic engine mount in two-mode operation meaning isolating mode in the highway driving condition and damping mode in the shock motions, is investigated.
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Pitukhin, Aleksandr Vasilyevich, Vadim Kostyukevich e Igor Skobtsov. "Energy-Absorbing Cab Support of Forest Machine". Applied Mechanics and Materials 791 (settembre 2015): 290–96. http://dx.doi.org/10.4028/www.scientific.net/amm.791.290.
Testo completoAbstract (sommario):
One of the requirements to the cabin of a forestry machine is the ability to absorb a certain amount of energy during deformation in the event of a rollover. The paper presents a method for increasing energy absorption of protective structure of a forestry machine cabin, enabling to reduce the risk of injuries to the operators in the event of an emergency. This is achieved by introducing into the structure of the protective frame of a cab energy-absorbing mounts in which the energy is absorbed due to plastic deformation of their elements in the event of a rollover of forestry machine. The article presents the design of the mount, describes the principle of its operation in the event of an emergency, and theoretical and experimental studies of the deformable mount. As the result of theoretical and experimental investigations the geometric parameters of the energy-absorbing mount are determined.
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Foumani, Mahmoud S., Amir Khajepour e Mohammad Durali. "Optimization of Engine Mount Characteristics Using Experimental/Numerical Analysis". Journal of Vibration and Control 9, n. 10 (ottobre 2003): 1121–39. http://dx.doi.org/10.1177/107754603030697.
Testo completoAbstract (sommario):
In this paper an experimental/numerical technique is developed for engine mount optimization. The method is general and can be applied to optimize active and passive vibration isolators or absorbers in any mechanical systems or civil structures. Engine mount optimization techniques mostly rely on an accurate mathematical model of the whole vehicle, which in most cases is not available or is too difficult to develop. As a result, the current approach for selecting engine mounts for a vehicle is based upon trial and error which is very time-consuming and expensive. The proposed technique counts upon experimental data for optimization and does not require any mathematical model of the vehicle or its components. The required experiments are similar to the current trial-and-error based experiments performed on a vehicle for mounts selection. The method is evaluated experimentally using a quarter car model and the results corroborate the proposed optimization method.
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Ferreira, Jessimon, Bianca Marin, Giane G. Lenzi, Calequela J. T. Manuel, José M. Balthazar, Wagner B. Lenz, Adriano Kossoski e Angelo M. Tusset. "Neural Network Modeling and Dynamic Analysis of Different Types of Engine Mounts for Internal Combustion Engines". Sensors 22, n. 5 (25 febbraio 2022): 1821. http://dx.doi.org/10.3390/s22051821.
Testo completoAbstract (sommario):
This paper presents the results of studies on reducing the amount of vibrations in different frequency ranges generated by a combustion engine through the use of different types of engine mounts. Three different types of engine supports are experimentally and numerically analyzed, namely an elastomeric engine mount, an elastomeric engine mount with a hydraulic component and standard decoupling, and an elastomeric engine mount with a hydraulic component and a modified decoupler—with this engineering design being a novelty in the literature. Experimental tests that considered different excitation frequencies were performed for the three types of engine mounts. Experimental data for stiffness and damping were used to obtain nonlinear mathematical models of the two systems with hydraulic components through the use of an Artificial Neural Network (ANN). For the results, all of the mathematical models presented coefficients of determination, R2, greater than 0.985 for both stiffness and damping, showing an excellent fit for the nonlinear experimental data. Numerical results using a quarter-car suspension model showed a large reduction in vibration amplitudes for the first vibration model when using the hydraulic systems, with values ranging between 48.58% and 66.47%, depending on the tests. The modified system presented smaller amplitudes and smoother behavior when compared to the standard hydraulic model.
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Montague, John. "Mount Eagle". Labyrinthe, n. 5 (15 gennaio 2000): 99–111. http://dx.doi.org/10.4000/labyrinthe.274.
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Waddell, Ellen. "Mount Royal". Hopkins Review 8, n. 2 (2015): 254. http://dx.doi.org/10.1353/thr.2015.0023.
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Sullivan, Kelly. "Mount Desert". Hopkins Review 10, n. 2 (2017): 250. http://dx.doi.org/10.1353/thr.2017.0050.
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Monson, Robert J., e Jianhua Yan. "SHOCK MOUNT". Journal of the Acoustical Society of America 133, n. 3 (2013): 1847. http://dx.doi.org/10.1121/1.4795055.
Testo completo