Relevant bibliographies by topics / Free-free resonant column test

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Free-free resonant column test'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Free-free resonant column test.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Free-free resonant column test"

1

Senetakis, Kostas, and Anastasios Anastasiadis. "Material Damping of Crushed Rock in Free-Decay Mode." Applied Mechanics and Materials 775 (July 2015): 283–86. http://dx.doi.org/10.4028/www.scientific.net/amm.775.283.

Full text
Abstract:
Damping of geo-materials in resonant column test is commonly evaluated with two alternative experimental methods; during a steady-state vibration (SSV) and during free-vibration decay (FVD). Damping is an important dynamic property necessary to capture the complete behavior of soils. In the study, representative test results on crushed rock are discussed with a focus on material damping derivations along with stiffness degradation test results derived from torsional resonant column tests. A comparison between material damping derived from the SSV and FVD methods and from small to medium shear strains is presented and discussed. In the first part of the paper, the definition of material damping by means of a closed loop in the shear stress - shear strain plane is presented along with a report on literature data associated with damping of coarse-grained soils and the important factors that control material damping of sands and gravels. In the second part, the materials and experimental techniques of the study are described briefly and the background of determining material damping in a resonant column test is also presented along with the analytical formulae. Finally, in the third part representative test results are given including both stiffness and damping, and a comparison of damping derivations using different methods is also highlighted.
APA, Harvard, Vancouver, ISO, and other styles
2

Kim, Dong-Soo, Gi-Chul Kweon, and Kwang-Ho Lee. "Alternative Method of Determining Resilient Modulus of Compacted Subgrade Soils Using Free-Free Resonant Column Test." Transportation Research Record: Journal of the Transportation Research Board 1577, no. 1 (January 1997): 62–69. http://dx.doi.org/10.3141/1577-08.

Full text
Abstract:
An alternative procedure of determining the resilient modulus ( MR) of compacted subgrade soils using a free-free resonant column (FF-RC) test is proposed. The FF-RC test was used to determine a small-strain Young’s modulus ( Emax) and Poisson’s ratio on the basis of the elastic wave propagation theory. Resonant column (RC) and torsional shear (TS) tests were performed to investigate the effects of loading frequency and strain amplitude on the resilient modulus of subgrade soils. By performing FF-RC, RC/TS, and MR tests on the synthetic specimens of known stiffnesses, the feasibility of using the FF-RC test to measure the MR was evaluated and the MR testing equipment was calibrated. Moduli of subgrade soils determined by FF-RC tests match well with values obtained from RC and TS tests at small strains, indicating that the FF-RC test can provide a reliable estimation of Emax, if the effects of loading frequency are considered. In the proposed method, Emax obtained from the FF-RC test can be combined with the effect of loading frequency and the modulus reduction curve determined by the data base of the RC and TS tests for the compacted subgrade soils of various plasticity indexes. Moduli obtained from the proposed method overlapped nicely with MR values determined by standard MR testing, showing the capability of the proposed method being used in determining MR values, provided that the effects of loading frequency and modulus reduction curve are considered.
APA, Harvard, Vancouver, ISO, and other styles
3

Facciorusso, Johann, and Claudia Madiai. "On Cohesive Soil Damping Estimation by Free Vibration Method in Resonant Column Test." Geotechnical Testing Journal 43, no. 6 (April 1, 2020): 20180241. http://dx.doi.org/10.1520/gtj20180241.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Gabryś, Katarzyna, Emil Soból, Wojciech Sas, and Alojzy Szymański. "Material damping ratio from free-vibration method." Annals of Warsaw University of Life Sciences – SGGW. Land Reclamation 50, no. 2 (June 1, 2018): 83–97. http://dx.doi.org/10.2478/sggw-2018-0007.

Full text
Abstract:
Abstract One important aspect of soil dynamics is attenuation or energy loses. This inherent dynamic property is essential in the analysis of soil behavior subjected to a dynamic load. Energy absorption in soils leads to the definition of an equivalent viscous damping ratio (D). In resonant column testing there are commonly two different approaches in measuring material damping: during a steady-state vibration (SSV), when the specimen is vibrated at its first mode; and during free-vibration decay (FVD). The study reports results associated with the small to medium strain range material damping from FVD method, i.e. there is a cut off the constant vibration of the specimen at resonance and the specimen is allowed to free-vibration mode while the decay strain amplitude during free-vibration is calculated. The experiments were conducted on cohesive soils (sasiCl, Cl, clSa) from various test sites located in Warsaw, Poland. All the specimens were subjected to torsional mode of vibration at their first natural frequency, at different mean effective stress. The authors paid particular attention to the number of successive cycles after the free-vibration of the material is initiated. They examined various propositions from the literature and compare the received damping values using different number of cycles of vibration. The results showed that the most stable values of material damping ratio can be obtained by selecting each time a line of best fit on the authors’ choice of number of free-vibration cycles. However, the number of these cycles should not exceed 10.
APA, Harvard, Vancouver, ISO, and other styles
5

Schaeffer, Kevin, Richard Bearce, and Judith Wang. "Dynamic Modulus and Damping Ratio Measurements from Free-Free Resonance and Fixed-Free Resonant Column Procedures." Journal of Geotechnical and Geoenvironmental Engineering 139, no. 12 (December 2013): 2145–55. http://dx.doi.org/10.1061/(asce)gt.1943-5606.0000945.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

David Suits, L., TC Sheahan, ME Kalinski, and MSR Thummaluru. "A New Free-Free Resonant Column Device for Measurement of Gmax and Dmin at Higher Confining Stresses." Geotechnical Testing Journal 28, no. 2 (2005): 12187. http://dx.doi.org/10.1520/gtj12187.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Prokhorov, V. E. "COLLISION OF THE DROPLET WITH THE FREE SURFACE: ACOUSTIC EMISSION IN THE WATER COLUMN." DEDICATED TO THE 90TH ANNIVERSARY OF PROF. K.N. FEDOROV OCEAN PHYSICS 47, no. 3 (November 6, 2019): 114–21. http://dx.doi.org/10.29006/1564-2291.jor-2019.47(3).10.

Full text
Abstract:
An experimental study of the emission of sound by droplets falling into an unperturbed liquid was performed using wideband hydrophones and a high-speed video camera. Collision of a drop with a water surface is accompanied by air entrainment and the formation of underwater gas cavities, which leads to the appearance of surface forces and fast flows, generating extreme accelerations, which are sufficient for resonant acoustic excitation of cavities and emission of sound packets. The sequence of emitted signals contains a shock pulse, as well as one or more sound packets generated by resonant bubbles detached from underwater cavities. The number of resonating bubbles varies from experience to experience, depending on the collision scenario and further behavior, including, in particular, the process of fragmentation of the primary cavities. The dimensions of the bubbles, measured on video frames, correspond to the values calculated in accordance with the Minnaert resonance frequency.
APA, Harvard, Vancouver, ISO, and other styles
8

Tallavo, Fernando, Giovanni Cascante, Ayan Sadhu, and Mahesh D. Pandey. "New Analysis Methodology for Dynamic Soil Characterization Using Free-Decay Response in Resonant-Column Testing." Journal of Geotechnical and Geoenvironmental Engineering 140, no. 1 (January 2014): 121–32. http://dx.doi.org/10.1061/(asce)gt.1943-5606.0000984.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Cascante, Giovanni, John Vanderkooy, and Wilson Chung. "A new mathematical model for resonant-column measurements including eddy-current effects." Canadian Geotechnical Journal 42, no. 1 (February 1, 2005): 121–35. http://dx.doi.org/10.1139/t04-073.

Full text
Abstract:
Wave velocity and attenuation are commonly studied in the laboratory with the resonant-column device (American Society for Testing and Materials standard), which is driven by a set of coils and magnets. This paper presents a new and robust mathematical model of the electromechanical resonant-column system. The model is used to compute various transfer functions. Eddy currents, a new source of damping identified in the resonant-column device, introduce damping proportional to the velocity of the magnets. Eddy-current damping is considered in the mathematical model. A testing program is devised to calibrate the resonant column with three aluminum probes. Experimental and theoretical results show an excellent agreement (4% maximum error). Exploratory results are presented for a dry-sand specimen. A resonant-column device is modified to demonstrate the significant effect of the induced voltage (electromotive force (EMF)) on damping ratio if tests are not based on current measurements. Free-vibration tests on aluminum specimens and a dry-sand specimen show a significant effect of the induced EMF (up to 400% increase in damping for the sand specimen). The induced voltage depends on the resonant frequency and damping of the specimen. In the case of aluminum probes, eddy-current damping represents 20–150 times the material damping of the specimen. Preliminary results on dry sand show that eddy-current damping represents up to a 15% increase in damping ratio. However, the magnitude of eddy-current damping depends on the configuration and materials used in the resonant-column device. The smaller the damping ratio of the specimen is, the more important the eddy-current damping becomes.Key words: damping, eddy currents, mechanical waves, resonant-column device, shear modulus, wave velocity.
APA, Harvard, Vancouver, ISO, and other styles
10

Xiao, Ding Jun, Bin Li, Chuan Jin Pu, and Hui Qi Zhou. "Model Test and Numerical Simulation for Directional Pressure Relief Blasting." Advanced Materials Research 779-780 (September 2013): 848–56. http://dx.doi.org/10.4028/www.scientific.net/amr.779-780.848.

Full text
Abstract:
To study directional pressure relief blasting, cement mortar model tests are carried out. Protecting borehole wall, free-face wall and bottom wall are tested of the dynamic strain. Three-dimensional numerical simulation and numerical calculation of the tests are conducted by using LS-DYNA3D. The pressure values and test results of the protecting borehole wall, free-face wall and bottom wall with the same distance from the explosives are compared. Development and distribution of pressure regularity are analyzed; blast hole pressure relief effect of protecting borehole wall materials and bottom interval air column are explicated. The present results indicate that there is an obvious stress concentration phenomenon on the free-face wall, with an average pressure decrease rate of 26% from the free-face wall to the protecting borehole wall with the same distance to the explosive center, while the isolation materialPVCU plays a good directional protection. The pressure effect of the blast hole bottom air column on the blast hole is apparent. The simulation results are consistent with the experimental dates.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Free-free resonant column test"

1

Cooley, Dane A. "Effects of Reclaimed Asphalt Pavement on Mechanical Properties of Base Materials." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd1094.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Wenglas, Lara Gilberto. "Quality evaluation of Portland cement concrete at early age with free-free resonant column." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2008. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Pucci, Martin Joseph. "Development of a multi-measurement confined free-free resonant column device and initial studies." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-08-1541.

Full text
Abstract:
This study is comprised of three major parts. The first part involved the development of a multi-measurement, confined, free-free resonant column device. This device was developed to improve upon traditional manually excited, vacuum-confined, free-free methods. The device is capable of testing specimens with diameters up to 6-in., under confinements upwards of 50 psi. The device is composed of a seismic-source system, a data acquisition system and a specimen support and confinement system. The seismic source system is used to induce small-strain constrained compression waves, and longitudinal and torsional stress waves in the specimen. The data acquisition system is used to measure: (1) direct travel time of constrained compression waves, (2) longitudinal resonance in unconstrained compression, and (3) torsional resonance. From these measurements, constrained compression wave velocity, Vp, unconstrained compression wave velocity, Vc, and shear wave velocity, Vs, can be determined. With these wave velocities, small-strain, constrained modulus, Mmax, Young’s modulus, Emax, and shear modulus, Gmax can be determined. Poisson’s ratio is also calculated with the wave velocities. Finally, from the resonance measurements, small-strain material damping in unconstrained compression, DCmin, and in shear, DSmin, can be evaluated. The second part of this study involved verification tests with materials of known dynamic properties. The tests were performed with a manufactured aluminum specimen, ASTM graded Ottawa sand, and crushed rock aggregate base. The results compared well with previous results from similar tests. The third part of this study involved testing artificially cemented ASTM graded Ottawa sand. Cement contents (by weight) of 0.0, 0.5, 1.0 and 2.0%, were used to observe the effect of cementation with curing time at a constant confining pressure of 5 psi. The overall effect of cementation was: (1) a large increase in stiffness, and (2) an increase in material damping. The key effects related to cementation versus curing time are: (1) the increase in wave velocities are reasonably proportional to an increase in cement content up to a curing time of about 5 to 7 days, and (2) after a curing time of 5 to 7 days time the velocity increase with time seems to be similar for all cemented specimens. Additionally, the 2% cemented specimen was tested to observe the effect of confining pressure. The stiffness of this specimen was quite insensitive to confining pressure as was the material damping.
text
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Free-free resonant column test"

1

Shinde, Ninad Sanjeev, and Jyant Kumar. "Calibration Exercise of Fixed-Free Resonant Column Apparatus." In Lecture Notes in Civil Engineering, 35–42. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4001-5_4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Atanasov, Nikolay, Gabriela Atanasova, and Blagovest Atanasov. "Wearable Textile Antennas with High Body-Antenna Isolation: Design, Fabrication, and Characterization Aspects." In Modern Printed-Circuit Antennas. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.91143.

Full text
Abstract:
This chapter provides a brief overview of the types of wearable antennas with high body-antenna isolation. The main parameters and characteristics of wearable antennas and their design requirements are discussed. Next, procedures (passive and active) to test the performance of wearable antennas are presented. The electromagnetic properties of the commercially available textiles used as antenna substrates are investigated and summarized here, followed by a more detailed examination of their effects on the performance of wearable antennas with high body-antenna isolation. A trade-off between substrate electromagnetic properties and resonant frequency, bandwidth, radiation efficiency, and maximum gain is presented. Finally, a case study is presented with detailed analyses and investigations of the low-profile all-textile wearable antennas with high body-antenna isolation and low SAR. Their interaction with a semisolid homogeneous human body phantom is discussed. The simulations and experimental results from different (in free-space and on-body) scenarios are presented.
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Free-free resonant column test"

1

Sado´ Garriga, Octavi, and Jeffrey M. Falzarano. "Water Waves and Marine Structure Interaction." In ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/omae2004-51633.

Full text
Abstract:
The purpose of this paper is to combine and extend existing potential flow theory in order to analyze the linear free surface problem of an Oscillating Water Column (OWC) device and apply it to moonpool design. Analytical results were obtained implementing the previously derived theories, and later compared to experimental results conducted at the University of New Orleans Towing Tank. The model tests consisted of a study of a cylindrical OWC. The theoretical and experimental results of the free surface for the OWC tests agree for the resonant frequency estimation response but they disagree on the amplitude of the response.
APA, Harvard, Vancouver, ISO, and other styles
2

Hosseini, Reihaneh, Kenneth H. Stokoe, Gunwoong Kim, Sungmoon Hwang, Farnyuh Menq, Charles M. Woodruff, Hande Gerkus-Harris, and Dustin G. Mortensen. "Free-Free Resonant Column Testing of Rock Cores from Two Spillways and Adjacent Exposed Rock Areas of a Dam." In Geo-Congress 2020. Reston, VA: American Society of Civil Engineers, 2020. http://dx.doi.org/10.1061/9780784482810.043.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Mendes, António C., Francisco P. Braga, and John R. Chaplin. "Wavetank Tests With a 1:20 Scale Model of a Distensible Tube Device for Wave Power Harnessing in the Azores." In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-18176.

Full text
Abstract:
Abstract The present research focuses on the performance assessment of a wave power system targeted for electrical supply of small communities in the Azores Archipelago. Firstly, the wave power potential and wave directionality in the region is assessed. The data collected points to a device capable of withstanding severe wave climate. The device considered herein incorporates a long rubber tube filled with water, floating head to waves, connected to an oscillating-water-column (OWC) in a shaft. The shaft and power take-off system (PTO) are to be mounted on an offshore jacket platform. By interacting with the incoming ocean waves the tube excites the OWC at its stern, thereafter forcing air in and out of the pneumatic chamber through a turbine-generator set. It has been observed that this device performs as a multiresonant attenuator that couples the tube’s surging motion and longitudinal pressure bulges with the water column oscillations. In our physical model the power take-off’s nonlinear impedance is emulated by means of a set of calibrated orifice plates with different diameters, connecting the pneumatic chamber to the atmosphere. A series of tests have been carried out with a 1:20 scale physical model in wave-tank, undertaken in regular waves that translate to 5 to 9 seconds wave period in full-scale. Two sets of waves were launched, whose wave heights cover a range from 1 to 5 m in real sea conditions, in deep water as well as in intermediate water depths. The pressure inside the chamber and the free-surface displacement in the shaft have been monitored, as well as the wave field. They provide estimates of the extracted power and energy capture efficiency of the system as a function of incident wave period. Scale effects are also addressed by comparison with previous experiments at different scales. Moreover, the amplification coefficient with the tube in position is quantified and compared with typical values for OWCs alone. It is worth noting that the accuracy of the power and energy capture predictions is greatly dependent on the volume flow calculations. Miller’s algorithm for compressible flow has been applied to reduce the uncertainty of volume flow calculations across the PTO orifice. The influences of the resonant operating modes and PTO impedance upon the capture-width are also discussed. The results obtained so far enable us to provide reliable estimates of absorbed power and energy capture efficiency, in prototype dimensions, under the wave climate in the Azores namely at Corvo Island.
APA, Harvard, Vancouver, ISO, and other styles
4

Gomes, R. P. F., J. C. C. Henriques, L. M. C. Gato, and A. F. O. Falcão. "Experimental Tests of a 1:16th-Scale Model of the Spar-Buoy OWC in a Large Scale Wave Flume in Regular Waves." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78233.

Full text
Abstract:
This paper presents the experimental tests of a 16th-scale model of the Spar-buoy oscillating water column (OWC) carried out at a large scale wave flume. The model is slack-moored to the flume floor by two mooring lines. The turbine effect is replicated using calibrated orifice plates. The device six degree-of-freedom motion, inner free surface displacement and air chamber pressure are measured. The influence of wave height, turbine damping and mass distribution on the system dynamics is analysed for regular waves. An in-house developed numerical time-domain model is used to simulate the motion and power absorption under the same wave conditions as the physical model tests. The formulation considers linear hydrodynamic forces, viscous drag effects and drift forces. The floater is assumed to oscillate in six degrees of freedom and the OWC can move vertically in the tube. The mooring system is simulated using a quasi-static model. The comparison between experiments and numerical simulations shows a good agreement for wave periods outside the zone where parametric resonance in roll and pitch occurs.
APA, Harvard, Vancouver, ISO, and other styles
5

Song, Xubin, Mehdi Ahmadian, Steve Southfield, and Lane Miller. "Superharmonics-Free Adaptive Semiactive Magneto-Rheological Suspension." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79355.

Full text
Abstract:
This paper focuses on laboratory implementation of a semiactive seat suspension with application of magneto-rheological (MR) dampers. We firstly introduce the nonlinear dynamics phenomena induced with the skyhook control that is now widely applied from structural vibration suppression to commercialized vehicle suspensions. However, superharmonic dynamics has not been clearly addressed in such vibration control systems. This paper tries to explain how superharmonics are created with skyhook controls through testing data analysis. Furthermore, in order to avoid this dynamics issue, this study implements a nonlinear model-based adaptive control into this MR damper based seat suspension. Based on a nonparametric MR damper model, the adaptive algorithm is expanded mathematically, and the system stability is discussed. Then in the following sections, this paper describes implementation procedures such as modeling simplification and validation, and testing results. Through the laboratory testing, the adaptive suspension is compared to two passive suspensions: hard-damping (stiff) suspension with max current of 1A to the MR damper, and low-damping (soft) suspension with minimum of 0A, while broadband random excitations are applied with respect to the seat suspension resonant frequency in order to test the adaptability of the adaptive control. Furthermore, mass and spring rate are assumed known and unknown for this adaptive controller to investigate the capability of this algorithm with the simplified model, respectively. Finally the comparison of testing results is presented to show the effectiveness and feasibility of the proposed adaptive algorithm to eliminate the superharmonics from the MR seat suspension.
APA, Harvard, Vancouver, ISO, and other styles
6

Wong, T. E., and C. Chu. "Thermal Fatigue Life Prediction Model of CCGA Tin-Lead and Lead-Free Interconnects." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-13049.

Full text
Abstract:
A thermal fatigue life prediction model of a ceramic column grid array (CCGA) solder joint assembly has been developed when the 90Pb/10Sn solder columns of the CCGA package are soldered onto the printed circuit board with either tin-lead or lead-free solder paste. This model was evolved from an empirically derived formula by correlating the solder nonelastic strain energy density increment to the fatigue life test data. To develop the solder joint fatigue life prediction model, a nonlinear finite element analysis (FEA) was conducted using the ABAQUS computer code. A thermal fatigue life prediction model was then established. The test results, obtained from various sources in which tin-lead and lead-free solder pastes on PCB were used, combined with the FEA derived nonelastic strain energy density per temperature cycle, ΔW, were used to calibrate the proposed life prediction model. In the analysis, 3-D finite element global- and sub-modeling techniques were used to determine the ΔW of the CCGA solder joints when subjected to temperature cycling. The analysis results show that: 1) solder joint would typically fail across solder column instead of along solder pad interfaces; and 2) higher nonelastic strain energy densities of solder occur at the solder columns at the package corners and these solder joints would fail first. These analysis predictions are consistent with the test observations. In the model calibration process, the 625- and 1657-pin CCGA test results, which were cycled between 20°C/90°C, 0°C/100°C, -55°C/110°C, or -55°C/125°C, were reasonably well correlated to the predicted values of ΔW. Therefore, the developed life prediction model could be used and is recommended to serve as an effective tool to determine the integrity of the CCGA solder joints during temperature cycling. In addition, the following future work is recommended: 1) selecting more study cases with various solder joint configurations, package sizes, environmental profiles, etc. to further calibrate this life prediction model; 2) using this model to conduct parametric studies to identify critical factors impacting solder joint fatigue life and then seek an optimum design; and 3) developing a simplified method instead of the FEA approach to make preliminary thermal fatigue life estimates of the CCGA solder joints.
APA, Harvard, Vancouver, ISO, and other styles
7

Lau, John, and Walter Dauksher. "Reliability of an 1657CCGA (Ceramic Column Grid Array) Package With 95.5Sn3.9Ag0.6Cu Lead-Free Solder Paste on PCBs (Printed Circuit Boards)." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-55041.

Full text
Abstract:
In many applications such as computers and telecommunications, the IC chip sizes are very big, the on-chip frequency and power dissipation are very high, and the number of chip I/Os is very large. The CCGA (ceramic column grid array) package developed by IBM is one of the best candidates for housing these kinds of chips [1–7]. There are two parts in this study. One is to show that the 2-parameter Weibull life distribution is adequate for modeling the thermal-fatigue life of lead-free solder joints. This is demonstrated by comparing the 2-parameter and 3-parameter Weibull distributions with life test data of an 1657-pin CCGA package with the 95.5wt%Sn3.9wt%Ag0.6wt%Cu lead-free solder paste on lead-free PCBs (printed circuit boards) under thermal cycling conditions. The other part of this study is to determine the time-history creep strain energy density of the 1657-pin CCGA solder column with two different solder paste materials, namely, 95.5wt%Sn3.9wt%Ag0.6wt%Cu and 63wt%Sn37wt%Pb and under three different thermal cycling profiles, namely, 25 ↔ 75°C, 0 ↔ 100°C, and −25 ↔ 125°C. The effects of these solder pastes and temperature conditions on the thermal-fatigue life of the high-lead (10wt%Sn90wt%Pb) solder columns of the CCGA package are provided and discussed.
APA, Harvard, Vancouver, ISO, and other styles
8

Tahar, Arcandra, and Lyle Finn. "Inplace Model Test Result Correlation of Multi Column Floater (MCF): Drilling and Production Unit." In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20640.

Full text
Abstract:
This paper presents the comparison of model tests and numerical results of Multi Column Floater (MCF). MCF is a new drilling and production deep-draft semisubmersible platform developed by Horton Wison Deepwater in Houston. A vertically restrained well deck or Multi Riser Buoyancy Can (MRBC) configured in the center of the MCF is technology enabler for dry tree semisubmersible. The MRBC independently supports and tensions the production and drilling risers. The production risers may be a combination of dry tree risers and subsea tree tubing risers. Inplace model tests were carried out at the FORCE Technology basin during the period September-October, 2007 for the internal study. The test emphasis was to understand the physical behavior of MCF at model scale so that a thorough correlation study could be carried out. MCF mooring stiffness, riser stiffness, natural periods and mass properties of the model were closely matched with target full-scale properties. Guide loads and relative motions between MRBC and hull were measured to obtain model-scale behavior. A wide range of sea states and towing speeds were covered in the test programs. Detailed comparison summarizing the statistical quantities of interests as well as time series and spectral plots are included in this paper. RAO and free decay comparisons are also described.
APA, Harvard, Vancouver, ISO, and other styles
9

Lobanov, P. D., O. N. Kashinsky, A. S. Kurdyumov, and N. A. Pribaturin. "Dynamic Processes During Pulsed Gas Injection Into Liquid Column." In 2016 24th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/icone24-60615.

Full text
Abstract:
An experimental study of dynamic processes during pulsed gas injection into quiescent liquids was performed. Both water and low melting temperature metal alloy were used as test liquids. Air and argon were used as gas phase. The test sections were vertical cylindrical columns 25 and 68 mm inner diameter. Measurements of flow parameters during gas injection were performed. Water – air experiments were performed at room temperature, the temperature of liquid metal alloy was 135 deg C. Time records of pressure in the liquid and in gas phase above the liquid were obtained. Measurements of liquid temperature and level of liquid surface were performed. It was shown that at pulse gas injection into liquid metal high amplitude pressure fluctuation may arise. Also the fluctuation variation of the free surface of the liquid may appear which are connected with the oscillations of the gas volume. Experimental data obtained may be used for verification & validation of modern CFD codes.
APA, Harvard, Vancouver, ISO, and other styles
10

Pakozdi, Csaba, Anders Östman, Erin E. Bachynski, and Carl Trygve Stansberg. "CFD Reproduction of Model Test Generated Extreme Irregular Wave Events and Nonlinear Loads on a Vertical Column." In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54869.

Full text
Abstract:
Recently, a method for numerical reproduction of measured irregular wave events has been developed. The measured motion of the wave maker flaps defines the wave kinematics at the boundary of the numerical simulation in order to generate the waves as described in (Pakozdi, Kendon, & Stansberg, 2011) and (Ostman, Pakozdi, Stansberg, Fagertun, & Vestbostad, 2015). When such data are not available, the control signal of the wave maker can, instead, be generated from a given free surface elevation following the same procedure as in model tests. Following this procedure automatically gives the possibility to subsequently reproduce the numerical wave experimentally using the obtained control signal. The latter procedure is applied to a model test case with extreme irregular wave events and resulting nonlinear global wave loads on a vertical cylinder (Stansberg, 1997), with the focus on higher-order ringing excitation. The purpose of the investigation is two-fold: 1) to validate the wave reconstruction procedure, and 2) to validate the resulting CFD ringing loads with the given waves. The results show generally good agreement both in the waves and in the loads; discrepancies found in the loads are considered to be mainly originating from corresponding uncertainties in the wave reconstruction. Wave breaking may be one source of uncertainty.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Free-free resonant column test' for particular source types:
Journal articles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography