scholarly journals On-Line Pseudo-Dynamic Response Test for Evaluating Seismic Isolation Effect by Tire Chips on Response of Saturated Sand Deposits

2010 ◽  
Vol 59 (1) ◽  
pp. 20-25
Author(s):  
Takashi KANEKO ◽  
Masayuki HYODO ◽  
Yukio NAKATA ◽  
Norimasa YOSHIMOTO ◽  
Hemanta HAZARIKA
Keyword(s):  
Dynamic Response ◽  
Seismic Isolation ◽  
Isolation Effect ◽  
Saturated Sand ◽  
Response Test ◽  
Tire Chips ◽  
On Line

scholarly journals ON LINE PSEUDO-DYNAMIC RESPONSE TEST ON STRATIFIED GROUND CONSISTING OF LAYERS OF CLAY AND SAND

2004 ◽  
pp. 207-219
Author(s):  
Naoki TAKAHASHI ◽  
Masayuki HYODO ◽  
Norimasa YOSHIMOTO ◽  
Yoichi YAMAMOTO
Keyword(s):  
Dynamic Response ◽  
Response Test ◽  
On Line

Dynamic response of stand-alone and adjacent footing on saturated sand

2021 ◽  
Vol 143 ◽  
pp. 106584
Author(s):  
Gonzalo Barrios ◽  
Kentaro Uemura ◽  
Naotaka Kikkawa ◽  
Kazuya Itoh ◽  
Tam Larkin ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Saturated Sand

Breath-by-breath VCO2 and VO2 required compensation for transport delay and dynamic response

1982 ◽  
Vol 52 (1) ◽  
pp. 79-84 ◽  
Author(s):  
H. Noguchi ◽  
Y. Ogushi ◽  
I. Yoshiya ◽  
N. Itakura ◽  
H. Yamabayashi
Keyword(s):  
Computer Simulation ◽  
Dynamic Response ◽  
Mass Spectrometer ◽  
Time Constant ◽  
Collection Method ◽  
Transport Delay ◽  
First Order ◽  
On Line

Both transport delay (DELAY) and dynamic response (RESPONSE) of a mass spectrometer would theoretically result in considerable errors in the breath-by-breath calculation of VCO2 and VO2. However, curiously, the contribution of RESPONSE has been ignored. The purpose of this study is to quantify the error caused by RESPONSE. We found that RESPONSE of a mass spectrometer was regarded as a first-order response. We determined DELAY and time constant (T) of RESPONSE and compensated the on-line calculation for both DELAY and RESPONSE and for DELAY only. With T of 150 and 100 ms, deviations of VCO2 from the gas-collection method were 8 +/- 6 and 8 +/- 6 ml/min with compensation for both DELAY and RESPONSE, and 69 +/- 10 and 50 +/- 5 ml/min with compensation for DELAY only, respectively (mean +/- SD). Similar results were obtained with VO2. A computer simulation of error caused by RESPONSE disclosed that the error linearly increased with increasing T. We conclude that to be accurate within +/- 5% of the exact value, compensation should be made when T exceeds 25 ms.

scholarly journals Seismic Isolation Effect for Tunnel with Soft Isolation Layers.

1999 ◽  
pp. 27-36
Author(s):  
Sadao SHIMAMURA ◽  
Hiroshi KASAI ◽  
Masakazu HARUUMI
Keyword(s):  
Seismic Isolation ◽  
Isolation Effect

Riser Response Based Optimal Positioning of Deep-Water Vessels

2005 ◽  
Author(s):  
Christopher Hoen
Keyword(s):  
Dynamic Response ◽  
Deep Water ◽  
Attractive Alternative ◽  
Practical Applications ◽  
Regression Curves ◽  
Coiled Tubing ◽  
Transverse Current ◽  
Open Sea ◽  
Slow Drift ◽  
On Line

The present paper discusses the mathematical modeling of risers and riser-like structures applied in a positioning context for deep-water floating vessels. The main purpose of the paper is to show that an estimate for the optimal vessel position, sufficient for most practical applications, is obtained from measurements of the riser inclinations or related parameters at lower end, and optionally upper end, through a solution based on the variably tensioned beam differential equation. Due to the ease of implementation this solution is well suited for direct application in on-line riser monitoring systems. The method is an attractive alternative to on-line FE-analyses, application of pre-computed regression curves based on idealized loading or black-box neural networks, which has been proposed by others to be applied as basis for interpretation of the measured riser responses. The basic idea behind the method is based on the observation that the riser inclinations or stress-joint moments at upper and lower end have mainly two causes. Firstly an effect caused by the position of the riser top end relative to the wellhead due to permanent vessel offset and slow drift vessel motions, and secondly the effects of transverse current down the riser. The general theory behind the method will be outlined. It will then be shown how the method adapts to drilling-risers with flex-joints, risers with stress-joints and also to the special case of well intervention with coiled tubing in open sea without applying a work-over or marine riser. The performance of the method is illustrated using simulated vessel and riser dynamic response data. The simulations are performed for selected vessel types both for deep-water and shallower waters applying state-of-the-art software for simulation of the riser and vessel dynamic response in random sea states.

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