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Academic literature on the topic 'Friction Pendulum Device'

Author: Grafiati
Published: 14 March 2023

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Journal articles on the topic "Friction Pendulum Device"

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Sun, Yuhan, Yaodong Xue, Zhicheng Lu, and Po Gao. "Study on Mechanical Properties of Friction Pendulum Isolation Device for Transformer." Journal of Physics: Conference Series 2310, no. 1 (October 1, 2022): 012034. http://dx.doi.org/10.1088/1742-6596/2310/1/012034.

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Abstract Electrical equipment has high vulnerability under strong earthquakes due to its own material and structure characteristics. The seismic performance of electrical equipment can be effectively improved by installing isolation devices. Based on the finite element simulation, this paper establishes the finite element simulation model of the friction pendulum isolation device suitable for the main transformer electrical equipment, calculates and compares the mechanical response of the isolation device under different design parameters. The results show that the friction pendulum isolation device with conventional design can meet the load-bearing requirements of the main transformer under conventional conditions; increasing the friction coefficient can effectively improve the energy dissipation effect of the friction pendulum isolation device, but the increase of the friction coefficient will limit the design displacement of the isolation device, and the specific isolation effect needs to be further evaluated; changing the curvature radius of sliding surface has little effect on energy dissipation of friction pendulum isolation device. The research results in this paper can provide research basis for the application of friction pendulum isolation device in the field of electrical equipment.
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Alhasan, Ahmad, Omar Smadi, Georges Bou-Saab, Nacu Hernandez, and Eric Cochran. "Pavement Friction Modeling using Texture Measurements and Pendulum Skid Tester." Transportation Research Record: Journal of the Transportation Research Board 2672, no. 40 (May 30, 2018): 440–51. http://dx.doi.org/10.1177/0361198118774165.

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Pavement frictional behavior affects pavement performance in terms of vehicle safety, fuel consumption, and tire wear. Comprehending and interpreting pavement friction measurements is a challenging task, because of friction sensitivity to several uncontrollable factors. These factors include: pavement surface conditions, such as the type and thickness of contaminants and fluids on the surface and their interaction with friction forces; and the device operating conditions, such as sliding speed, material properties and geometry of the rubber slider used, and operating temperature. Despite the efforts to describe and quantify the impact of varying conditions on pavement friction, which ultimately will allow for a better harmonization of friction measurements, there is a need to better understand the link between the surface texture and physical friction measurements. In this paper, Persson’s friction model is used to analyze and understand the impact of surface texture on frictional behavior of dry pavement surfaces. The model was used to analyze 18 test locations, which were compared with the dry kinetic coefficients of friction (COF) estimated using a British pendulum tester (BPT). The results show that Persson’s friction model could predict the COF estimated from the BPT results with relatively high accuracy. In addition, the model could provide a profound explanation of the frictional forces mechanism. Finally, it was found that the mean profile depth (MPD) cannot provide a full picture of the frictional behavior. However, combining MPD with the Hurst exponent, texture measurements can potentially provide a full physical explanation of the frictional behavior for road surfaces.
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Bianco, Vincenzo, Giorgio Monti, and Nicola Pio Belfiore. "FINE-TUNING OF MODELLING STRATEGY TO SIMULATE THERMO-MECHANICAL BEHAVIOUR OF DOUBLE FRICTION PENDULUM SEISMIC ISOLATORS UST ESTIMATOR." NED University Journal of Research 3, Special Issue on First SACEE'19 (December 12, 2019): 165–72. http://dx.doi.org/10.35453/nedjr-stmech-2019-0058.

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The use of friction pendulum devices has recently attracted the attention of both academic and professional engineers for the protection of structures in seismic areas. Although the effectiveness of these has been shown by the experimental testing carried out worldwide, many aspects still need to be investigated for further improvement and optimisation. A thermo-mechanical model of a double friction pendulum device (based on the most recent modelling techniques adopted in multibody dynamics) is presented in this paper. The proposed model is based on the observation that sliding may not take place as ideally as is indicated in the literature. On the contrary, the fulfilment of geometrical compatibility between the constitutive bodies (during an earthquake) suggests a very peculiar dynamic behaviour composed of a continuous alternation of sticking and slipping phases. The thermo-mechanical model of a double friction pendulum device (based on the most recent modelling techniques adopted in multibody dynamics) is presented. The process of fine-tuning of the selected modelling strategy (available to date) is also described.
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Zhou, Fangyuan, Weilin Xiang, Kun Ye, and Hongping Zhu. "Theoretical study of the double concave friction pendulum system under variable vertical loading." Advances in Structural Engineering 22, no. 8 (February 19, 2019): 1998–2005. http://dx.doi.org/10.1177/1369433219831474.

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The double concave friction pendulum system has been recognized as an efficient device for decreasing the seismic response of a structure during an earthquake excitation. Previous studies have focused mainly on the properties of the double concave friction pendulum system under constant vertical loading, and the width of the hysteretic loop changed by the vertical ground motion is less considered. In view of this, a theoretical study of the double concave friction pendulum system under variable vertical loading is conducted in this article. Meanwhile, the properties of the hysteretic loops of the double concave friction pendulum system with different friction coefficients between the articulated slider with the upper and lower sliding surfaces are investigated. The results show that the hysteretic loops of the double concave friction pendulum system will be affected by the variation of the vertical loading and the difference of the friction coefficients between the articulated slider with the upper and lower sliding surfaces.
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Splith, T., A. Kaps, and F. Stallmach. "Phase plot of a gravity pendulum acquired via the MEMS gyroscope and magnetic field sensors of a smartphone." American Journal of Physics 90, no. 4 (April 2022): 314–16. http://dx.doi.org/10.1119/10.0009254.

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A gravity pendulum experiment in which a smartphone serves as pendulum bob and as measurement device is described. As the pendulum oscillates, the smartphone gyroscope and magnetometer sensors are used to simultaneously record the bob's angular velocity and angular displacement. While the angular velocity is measured directly via the gyroscope sensor, the angular displacement is deduced from the change of the magnetometer reading while the smartphone oscillates in the constant magnetic field of the Earth. These two independent measurements enable us to derive the phase space representation of the pendulum motion directly from experimental data. Further data analysis yields energy plots, including the periodic change between the pendulum's kinetic and potential energy and the energy dissipation due to friction. Detailed instructions on how to adopt the experiment, which is both suitable as a lecture demonstration as well as an instructional laboratory experiment, are provided in the supplementary material.
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Matta, Emiliano, and Rita Greco. "Modeling and design of tuned mass dampers using sliding variable friction pendulum bearings." Acta Mechanica 231, no. 12 (September 19, 2020): 5021–46. http://dx.doi.org/10.1007/s00707-020-02801-9.

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Abstract An effective vibration control device, the pendulum tuned mass damper (P-TMD), can be easily realized as a mass supported on rolling or sliding pendulum bearings. While the bearings’ concavity provides the desired gravitational restoring force, the necessary dissipative force can be obtained either from additional dampers installed in parallel with the bearings or from the same friction resistance developing within each bearing between the roller/slider and the rolling/sliding surface. The latter solution may prove cheaper and more compact but implies that the P-TMD effectiveness will be amplitude dependent if the friction coefficient is kept uniform along the rolling/sliding surface, as in conventional friction bearings. In this case, the friction P-TMD will be as efficient as a viscous P-TMD only at a given vibration level, with large performance reductions at other levels. To avoid this inconvenience, this paper proposes a new type of sliding variable friction pendulum (VFP) TMD, called the VFP-TMD, in which the sliding surface is divided into two concentric regions: a circular inner region, having the lowest possible friction coefficient and the same dimensions of the slider, and an annular outer region, having a friction coefficient set to an optimal value. A similar arrangement has been recently proposed to realize adaptive seismic isolation devices, but no specific application to TMDs is reported. To assess the VFP-TMD performance, first its analytical model is derived, rigorously accounting for geometric nonlinearities as well as for the variable (in time and space) pressure distribution along the contact area, and then, an optimal design methodology is presented. Finally, numerical simulations show the influence of the main design parameters on the device behavior and demonstrate that the VFP-TMD can achieve nearly the same effectiveness of viscous P-TMDs, while considerably outperforming conventional uniform-friction P-TMDs. The proposed analytical model can be used to enhance or validate existing models of VFP isolators that assume a constant and uniform contact pressure distribution.
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Sunarchin, Robert А., and Pavel V. Petrov. "Self-oscillation of the Froude pendulum (Numerical study)." Journal of Dynamics and Vibroacoustics 6, no. 1 (March 20, 2020): 35–42. http://dx.doi.org/10.18287/2409-4579-2020-6-1-35-42.

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A numerical study of the self-oscillation of the Froude friction pendulum is presented. For comparison with approximate analytical or graphical solutions, the cubic approximation is used as one of the approximations of the friction characteristic; changes in the case of other approximations are shown.By results of the conducted computational experiment was built characteristics of the amplitude of self-oscillations from dimensionless ratios, complexes of similarity, which showed the convergence of the estimated and actual (obtained by numerical integration) values of the amplitudes of oscillation for small values of friction and slope characteristics; if you increase the moment amplitude is also increased.It is noted that the results of computer modeling will significantly depend on the design, manufacturing technology and operating conditions of the device in question.
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Abed, Dana, Jafar Al Thawabteh, Yazan Alzubi, Jamal Assbeihat, and Eid Al-Sahawneh. "Influence of Earthquake Parameters on the Bi-directional Behavior of Base Isolation Systems." Civil Engineering Journal 8, no. 10 (October 1, 2022): 2038–52. http://dx.doi.org/10.28991/cej-2022-08-10-02.

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The introduction and development of the base isolation systems, especially the friction isolator device, were done recently to improve the capacity of adaptive behavior. The efficiency of multi-phase friction pendulums comes from their complexity, which helps reduce the structural responses and enhance structures' energy dissipation under lateral loads. Nevertheless, the influence of various earthquakes' properties on the behavior of base-isolation systems subjected to bi-directional seismic loading is still unclear. Hence, further research and studies regarding the behavior and capability of these systems under bi-directional loading are still necessary before incorporating this device in real-life practical applications. Therefore, this paper is intended to investigate the bi-directional behavior of the friction isolator subjected to various ground motion records. In order to do so, different versions of the friction pendulum system are selected and compared within the study context. Generally, the study's results have shown that the behavior of the friction isolator is highly dependent on low values of the PGA/PGV ratio. Besides, pulse-like earthquakes considerably impact the response of the isolator compared to non-pulse-like ones. Doi: 10.28991/CEJ-2022-08-10-02 Full Text: PDF
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Okamura, Shigeki, Satoshi Fujita, and Masayoshi Ikenaga. "Motion Analysis of Pendulum-Type Isolation Systems During Earthquakes: Dynamic Test and Response Analysis on a Three Story Steel Frame Model Supported by Four Friction Pendulum Bearings." Journal of Pressure Vessel Technology 126, no. 1 (February 1, 2004): 34–45. http://dx.doi.org/10.1115/1.1636789.

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After the Hanshin-Awaji Earthquake Disaster, the number of earthquake isolated buildings is increasing. Most of the base isolated buildings or structures are built on laminated rubber bearings in order to give them certain natural periods. This situation, however, also encourages structural engineers to research and develop nonrubber-type isolation systems such as linear motion bearing isolators and friction pendulum systems. It is considered that the nonrubber-type isolation systems can be applied to important industrial facilities, such as LNG tanks, boiler facilities and so on to refine their seismic reliabilities. In the device of the nonrubber-type isolation systems, the device which applied the sliding is especially noticed. However, when using nonrubber-type isolation systems with sliding in the open air circumstances, long term durability of the systems must be taken into account and it may be very difficult to maintain the friction coefficient of the system. In this study, the dynamic motion analysis and the experimental tests on the isolated structure mounted on four Friction Pendulum Bearing (FPB) Systems were carried out to investigate the performance of isolation due to the rotational motion which might be induced by the friction force difference in FPB system.
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Fenz, Daniel M., and Michael C. Constantinou. "Modeling Triple Friction Pendulum Bearings for Response-History Analysis." Earthquake Spectra 24, no. 4 (November 2008): 1011–28. http://dx.doi.org/10.1193/1.2982531.

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There are currently no applicable hysteresis rules or nonlinear elements available in structural analysis software that can be used to exactly model triple Friction Pendulum bearings for response-history analysis. Series models composed of existing nonlinear elements are proposed since they can be immediately implemented in currently available analysis software. However, the behavior of the triple Friction Pendulum bearing is not exactly that of a series arrangement of single concave Friction Pendulum bearings—though it is similar. This paper describes how to modify the input parameters of the series model in order to precisely retrace the true force-displacement behavior exhibited by this device. Recommendations are made for modeling in SAP2000 and are illustrated through analysis of a simple seismically isolated structure. The results are confirmed by (a) verifying the force-displacement behavior through comparison with experimental data and (b) verifying the analysis through comparison to the results obtained by direct numerical integration of the equations of motion.
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Book chapters on the topic "Friction Pendulum Device"

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Bianco, V., G. Monti, and N. P. Belfiore. "Mechanical Modelling of Friction Pendulum Isolation Devices." In Lecture Notes in Civil Engineering, 133–46. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-78936-1_10.

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Conference papers on the topic "Friction Pendulum Device"

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Tsai, C. S., T. C. Chiang, Wen-Shin Chen, Chen-Tsung Yang, and Jian-Liang Lin. "Finite Element Formulations and Experimental Study for Direction Optimized-Friction Pendulum System." In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/pvp2007-26521.

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The Friction Pendulum System (FPS) invented by V. A. Zayas in 1987 has been widely used in the seismic engineering all over the world. The efficiency for upgrading the earthquake-proof capability of a fixed base structure has been proved either from theoretical studies or experimental efforts. However, the seismic responses of the FPS-isolated structure are always significant as subjected to near fault earthquakes and strong ground motions with long predominant periods. In order to overcome the drawback of the FPS, a new base isolator named as the Direction Optimized Friction Pendulum System (DO-FPS) has been proposed in this study. The proposed device is mainly composed of a spherical sliding surface, a trench concave surface and an articulated slider. By using the special design, the isolation period is a function of the angle between the directions of the resultant displacement. Therefore, the undesirable phenomenon of resonance could always be prevented. In order to verify the functionality of the proposed device, the shaking table tests of a three story steel structure with DOFPS base isolators have been performed. The test results reveal that the proposed device can effectively upgrade the seismic resistibility of a conventionally fixed base structure. Furthermore, the comparisons between the numerical and the experimental results show that the theory proposed in this study could predict the nonlinear behavior of the DO-FPS with good accuracy.
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Fujita, Satoshi, Hiroshi Kurabayashi, and Hiromichi Yamamoto. "Low Cost Friction Pendulum-Type Earthquake Isolation Device With Poly-Curvature Suitable for Light-Weight Equipment." In ASME/JSME 2004 Pressure Vessels and Piping Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/pvp2004-2923.

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This paper describes the results of the response analysis and the experimental tests on the newly developed earthquake isolation system based on the theory of friction pendulum. In Japan, many types of earthquake isolation device or system have been developed and utilized to protect computers, precision equipments and important works of art from the severe seismic attacks. Although the performance of isolation of the each every one of the systems is sufficient, cost of the system is considered generally higher than the user expected and the system requires enough surrounding space to obtain adequate isolation performance. When applying the isolation device to the objects such as display cabinets in museum, computer server racks, bookshelves in library and vending machines which are generally placed adjacent to the wall, it is desirable to set them as closer to the behind wall as possible without decreasing their performance of isolation very much. The friction pendulum type isolation device with poly-curvature has been developed to satisfy these requirements, and the response analysis and the shake table tests have been carried out to investigate the performance of the system.
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Tsai, C. S., T. C. Chiang, and Wen-Shin Chen. "Finite Element Formulations for Direction Optimized-Variable Curvature Friction Pendulum System." In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/pvp2007-26555.

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The base isolation technology has been recognized as a very effective tool for controlling the seismic response of a structure during earthquakes. However, it is suggested from recent studies that the earthquakes with long predominant periods results in significant seismic responses of the base isolated structure. In view of this, a new base isolator called the Directional Optimized-Variable Curvature Friction Pendulum System (DO-VCFPS) has been proposed in this study. The radii of the curvature of the trench concave surface and the spherical sliding surface are lengthened with increasing the sliding displacement. Therefore, the isolation period can be shifted further away from the predominant periods of ground motions. Furthermore, by using the series connection of a trench concave surface and a spherical sliding surface, the isolation period is a function of the angle between the directions of the resultant displacement. In order to prove the efficiency of the proposed device, the finite element formulations of the DOVCFPS have been derived in this study. The numerical results show that the combination of the advantages of the Variable Curvature Friction Pendulum System (VCFPS) and the Directional Optimization Friction Pendulum System (DO-FPS) can improve the disadvantages of a base isolated structure with fixed isolation period.
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Tsai, C. S., Po-Ching Lu, and Wen-Shin Chen. "Shaking Table Tests of a Building Isolated With Trench Friction Pendulum System." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93253.

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It has been proven that the seismic isolation technology is a very promising tool to lessen damage caused by earthquakes. In order to provide a cheap and efficient base isolator for engineering practice, a new isolator named the trench friction pendulum system (TFPS), which is easy to design and manufacture, is proposed in this study. A series of shaking table tests of a scaled steel structure equipped with TFPS isolators were performed in the Department of Civil Engineering, Feng Chia University, Taichung, Taiwan. Experimental results demonstrate that the TFPS isolator can isolate most of earthquake induced energy trying to impart into the superstructure and that the device is not only cheap but also efficient for seismic mitigation.
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Vizi, Mate B., and Gabor Stepan. "Experimental Bifurcation Diagram of Furuta Pendulum." In ASME 2018 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/dscc2018-9030.

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The Furuta pendulum is a two degree of freedom mechanical system that serves as an excellent and simple device to check control strategies applied for strongly nonlinear mechanical structures. Stability results related to certain stationary motions of the Furuta pendulum are compared to experimental observations, and conclusions are obtained regarding some essential mechanical phenomena that are present in the experimental rig, but still not properly described in the standard mathematical model of the pendulum. The results call the attention for the importance of the identification of the Coulomb friction in the structure, which effect the control strategies to be implemented.
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Watanabe, Aya, Ryousuke Yuyama, Hiroshi Hosaka, and Akira Yamashita. "Fundamental Study on Friction-Driven Gyroscopic Power Generator Works Under Arbitrary Vibration." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-10474.

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Abstract This paper describes a friction-driven gyro generator that works under arbitrary vibrations and generates more than 1 W of power. Vibrational generators are energy harvesters that convert environmental vibrations into electrical power via the inertial force of pendulums. In conventional generators that use simple vibration, the power is less than 10 mW for a wearable size because vibrations in the natural environment are as low as 1 Hz. Gyroscopic generators increase the inertial force by rotating a pendulum at high speed and creating a gyro effect. In this generator, a palm-size product that generates 0.1 W and weighs 280 g has already been commercialized, but this device operates only under a particular vibration that synchronizes rotor precession and stalls under random vibration. To solve this problem, in this research, two gimbals and a precession spring are introduced to support the rotor. We developed a prototype generator with straight tracks measuring 16 cm × 11 cm × 12 cm with a mass of 980 g. Under a vibration of 4 Hz and ±20 degrees, power generation of 1.6 W was confirmed. Next, a prototype circular track was made. Power generation of 0.2 W with a vibration of 1 Hz and ±90 degrees was confirmed. Finally, a simple formula to estimate the upper limit of the generation power is derived. It is suggested that the circular-type generator is suitable for low-frequency vibration and can generate twice the power of a straight-type generator.
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Komaragiri, Satyavati, and Armen Amirkhanian. "Feasibility of Using British Pendulum Tester to Evaluate Laboratory Sized Diamond Ground Surfaces." In 12th International Conference on Concrete Pavements. International Society for Concrete Pavements, 2021. http://dx.doi.org/10.33593/rcpxbenz.

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Skid resistance and surface friction of pavements is an essential consideration in pavement performance and traffic safety. The British pendulum tester (BPT) is widely used to measure the skid resistance of pavements worldwide both in the field and laboratory. Diamond grinding and grooving is a commonly used surface rehabilitation technique for concrete pavements to improve their surface friction. At the laboratory scale, polishing of concrete pavement surfaces by diamond grinding and grooving using the three-wheel polishing device creates a smaller available test area compared to the test area required by the standard test method for the British pendulum test. This study presents a modified test method for the use of BPT on diamond ground surfaces with small test areas. To evaluate the feasibility of this method, the effect of different levels of polishing on the BPT measurements were analyzed. Results suggest that the BPT using the modified method described in this study is not a reasonable tool to evaluate the skid resistance of diamond ground surfaces at the laboratory scale.
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Tsai, C. S., H. C. Su, and T. C. Chiang. "Effect of Velocity Dependence on Sliding Characteristic of Sliding Types of Base Isolation Systems Each With Numerous Sliding Interfaces." In ASME 2011 Pressure Vessels and Piping Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/pvp2011-57064.

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Current structural analysis software programs offer few if any applicable device-specific hysteresis rules or nonlinear elements considering the velocity effect on the mechanical behavior of the multiple friction pendulum system (MFPS) with numerous sliding interfaces. Based on the concept of subsystems, here we propose an equivalent series system that adopts existing nonlinear elements with parameters systematically calculated and mathematically proven through rigorous derivations to take into account the velocity dependence effect on the sliding behavior of the sliding interfaces in the sliding type base isolators. Evaluations of the velocity dependence effect on the features of the sliding motions on numerous sliding interfaces have also been carried out. Results from the given examples demonstrate that the sliding motions of sliding interfaces considering velocity dependence behave quite differently from those excluding the effect of velocity dependence.
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Tsai, C. S., Tsu-Cheng Chiang, Bo-Jen Chen, and Mei-Jou Chen. "Component Test of the Full Scale MFPS Base Isolator." In ASME/JSME 2004 Pressure Vessels and Piping Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/pvp2004-2956.

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In recent years, there have been more and more engineering applications of the base isolation to enhance the seismic resistibility of the existing structures. The elastomeric base isolator and the sliding base isolator are the most popular types in the engineering applications. In this paper, the experimental results for the component test of the full scale multiple friction pendulum system (MFPS) have been introduced. The MFPS base isolator is a base isolator which possesses characteristics of the elastomeric and sliding type base isolators. The effectiveness of the device in reducing the seismic response of structures during earthquakes has been confirmed from the experimental results of the shaking table tests. In order to test the mechanical behavior of a full scale MFPS base isolator, the component tests of the device subjected axial loads of 500 tons, 900 tons and horizontally cyclic loadings have been executed. The experimental results show that the MFPS base isolator has a very stable mechanical behavior under many cycles of loadings. Hence, the durability of the MFPS base isolator can be proved from these experimental results.
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Bianco, Vincenzo, Giorgio Monti, and Nicola Belfiore. "COMPLETE ANALYTICAL THERMOMECHANICAL MODEL OF DOUBLE FRICTION PENDULUM DEVICES." In 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering Methods in Structural Dynamics and Earthquake Engineering. Athens: Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens (NTUA) Greece, 2017. http://dx.doi.org/10.7712/120117.5521.18268.

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