A Dynamic-Test Procedure for Improving Seismic Qualification Guidelines

1984 ◽  
Vol 106 (2) ◽  
pp. 143-148
Author(s):  
C. W. deSilva
Keyword(s):  
Test Object ◽  
Dynamic Testing ◽  
Test Procedure ◽  
Dynamic Test ◽  
Standard Test ◽  
Modes Of Failure ◽  
Principal Axes ◽  
Black Box Testing ◽  
Three Degree Of Freedom ◽  
Available Information

Several shortcomings of available standards, regulatory guides, and review plans for seismic qualification testing are identified. A rational test nomenclature is proposed. A standard test is developed by optimizing an appropriate test severity measure function. The standard test is a rectilinear test that is equivalent to the three-degree-of-freedom test with uncorrelated excitations, recommended in IEEE-Std. 344. In terms of eigenvectors of a resulting test matrix, a dynamic interpretation is given for principal axes of a test object. The proposed approach to dynamic testing has two main advantages in comparison to the conventional approach of black-box testing. Firstly, knowledge pertaining to test-object dynamics is directly employed in its development. Secondly available information on possible modes of failure in the overall system can be conveniently incorporated into the formulation.

Improvement of Response Spectrum Specifications in Dynamic Testing

1990 ◽  
Vol 112 (4) ◽  
pp. 384-387
Author(s):  
C. W. de Silva ◽  
M. Singh ◽  
J. Zaldonis
Keyword(s):  
Test Object ◽  
Dynamic Testing ◽  
Response Spectrum ◽  
Dynamic Test ◽  
Response Spectra ◽  
The Finite Element Method ◽  
Dynamic Information ◽  
Test Specifications ◽  
Support Motion ◽  
Test Objective

Required response spectra (RRS) are commonly used as dynamic-test specifications in product qualification. RRS specification for a product is normally developed by considering the operating environment of the product. This paper presents a technique to improve the RRS specification for a qualification test by employing available dynamic information on the test object. Specifically, a model of the test object subjected to support-motion inputs is employed. In practice, a model for the test object can be conveniently determined by experimental modal analysis or by the finite element method. The method presented in this paper may be viewed as a way to apportion the energy of test excitations among input locations of a test object in order to optimize a test objective. The underlying theory of the method of modifying a specified RRS is outlined and the computational steps of the method are given. A numerical example is presented to illustrate the use of the method.

Quasi-Static and Dynamic Testing as a Basis for Determining Seat Back Strength

2008 ◽  
Author(s):  
Brian R. Herbst ◽  
Chris C. Clarke ◽  
Steven E. Meyer ◽  
Arin A. Oliver ◽  
Davis A. Hock ◽  
...  
Keyword(s):  
Motor Vehicle ◽  
Dynamic Testing ◽  
Test Procedure ◽  
Dynamic Test ◽  
Test Methods ◽  
Static Test ◽  
Rear Impact ◽  
System Integrity ◽  
Cross Member ◽  
Occupant Kinematics

The performance of a vehicle’s seat back in rear impact accidents can significantly affect occupant kinematics and the associated injury potential. Efforts to establish seat back performance requirements have generated significant debate between stiff and yielding seats [1]. While this paper will not attempt to resolve that issue, the analysis contained herein will compare various test methods for determining the strength of seat backs. This paper presents two quasi-static test methodologies that can be used to evaluate seat back performance. The first method utilizes the test procedure outlined in Federal Motor Vehicle Safety Standard (FMVSS) 207, Seating Systems, by loading the seat through its upper cross member. The second method utilizes an Anthropometric Test Dummy (ATD) and applies the load to the seat back through the ATD’s lumbar spine; this method is referred to as the Quasistatic Seat Test (QST). Four seat designs were tested utilizing these two quasistatic test methods. The observations and data obtained from these tests are then compared to dynamic test data documented in FMVSS 301, Fuel System Integrity, type rear impact and sled testing.

Computerized Dynamic Testing: A Study of the Potential of an Approach Using Sensor Technology

2011 ◽  
Vol 10 (2) ◽  
pp. 178-194 ◽  
Author(s):  
Wilma C. M. Resing ◽  
Wouter M. P. Steijn ◽  
Iro Xenidou-Dervou ◽  
Claire E. Stevenson ◽  
Julian G. Elliott
Keyword(s):  
Test Performance ◽  
Dynamic Testing ◽  
Test Procedure ◽  
Dynamic Test ◽  
Sensor Technology ◽  
Training Design ◽  
Test Procedures ◽  
Outcome Scores ◽  
Extensive Information ◽  
Computerized Procedures

This study explored the use of computerized dynamic testing in education for 8-year-old children. As for other domains, it was expected that the use of a computer would help overcome difficulties encountered with traditional dynamic test procedures. A recently developed computerized console was used, based on sensor technology, in combination with electronic tangibles. The main aim was to investigate if dynamic testing with graduated prompts offered by a computerized interface provided richer and more extensive information about test performance than with prompts offered by an examiner. Fifty-four children participated in the dynamic test procedure, which used a pretest–posttest training design. The results indicated no significant differences in children’s performance based on whether prompts were offered by either the computer or by an examiner. The suitability of the procedure was measured by several behavioral outcome scores, the recording of which was made possible by the use of sensor technology. In the light of the findings, the authors conclude that dynamic testing can profit greatly from the use of computerized procedures.

A Dynamic Test Procedure for Evaluation of Tripped Rollover Crashes

2002 ◽  
Author(s):  
Raymond J. Hughes ◽  
Lance K. Lewis ◽  
Barry M. Hare ◽  
Yoshiyuki Ishikawa ◽  
Kazuo Iwasaki ◽  
...  
Keyword(s):  
Test Procedure ◽  
Dynamic Test

scholarly journals A Study on Factors Influencing the Determination of Moisture Content of Fibrous Peat

2011 ◽  
Vol 2 (2) ◽  
pp. 39-47 ◽  
Author(s):  
Pui Tau Shien ◽  
Seneviratne H.N. ◽  
Dygku Salma Awg Ismail
Keyword(s):  
Moisture Content ◽  
Particle Density ◽  
Peat Soil ◽  
Test Procedure ◽  
Field Measurements ◽  
Standard Test ◽  
Moisture Loss ◽  
Fibrous Peat ◽  
Saturated Sample

Fibrous peat is an undrained peat that usually possesses very high moisture content. However, not all experimental procedures are applicable for determination of moisture content of fibrous peat. This research is aimed at examining the determination of insitu moisture content of fibrous peat using field measurements. The peat soil samples were collected at shallow depths from Asajaya at Kota Samarahan and Taman Kopodims at Matang , Kuching Sarawak by using peat auger. The laboratory tests such as determination of moisture content, fiber content, particle density and ash content were conducted on the collected samples in order to establish relationships between the parameters. Undisturbed peat samples from Matang were subjected to falling head permeability test to determine the saturated permeability. The saturated sample were then allowed to drain freely to simulate the moisture loss possible during sampling when samples were brought out of boreholes. The test results showed that moisture content varies according to the drying temperature and position of the soil sample (top, middle and bottom) during sampling. Comparing samples from both locations, peat soil from Kota Samarahan possessed higher moisture content. The saturated permeability of peat sample was in the range of 2.62 – 3.05 cm/s. The free draining trial showed that moisture loss during sampling significantly influence the moisture content measurement. The variation in value of moisture content for fibrous peat may occurs due to several factors such as existing ground water table, sampling method by boring, existing standard test procedure which is not suitable for peat soils requirement and also because of the physical properties which varied according to depth of soil.

Comparative Study on the Pseudo-Dynamic Testing of Semi-Rigid Connection of Steel Frames with or without Brace

2011 ◽  
Vol 194-196 ◽  
pp. 2001-2007
Author(s):  
Jia Lv ◽  
Qi Lin Zhang
Keyword(s):  
Dynamic Testing ◽  
Dynamic Test ◽  
Lateral Force ◽  
Steel Frame ◽  
Seismic Loads ◽  
Test Results ◽  
Shearing Force ◽  
Braced Frame ◽  
Rigid Connection ◽  
Steel Braced Frame

The horizontal stiffness of steel frame is relatively weak. So designers introduce brace system into steel frame to increase the horizontal stiffness. In order to guarantee the safety of the structure, we should imitate the performance of the structure under seismic loads. In this paper, the pseudo-dynamic test was conducted on the semi-rigid connection of steel frame and the semi-rigid connection of steel-braced frame. The test results show that the brace can increase the ductility of the structure, decrease the displacement of the top floor, decrease the interlayer displacement, and bear ground floor shearing-force. So the brace greatly impacts the performance of the structure. It has the ability of anti-earthquake and strong resistance ability of lateral force.

Behavior of CFST-RC Pier under Different Ground Motions

2018 ◽  
Vol 1145 ◽  
pp. 134-139
Author(s):  
Raghabendra Yadav ◽  
Bao Chun Chen ◽  
Hui Hui Yuan ◽  
Zhi Bin Lian
Keyword(s):  
Earthquake Engineering ◽  
Large Scale ◽  
Dynamic Testing ◽  
Ground Motions ◽  
Dynamic Test ◽  
Longitudinal Direction ◽  
Steel Tube ◽  
Engineering Research ◽  
Magnification Factors ◽  
Time Histories

The dynamic testing of large-scale structures continues to play a significant role in earthquake engineering research. The pseudo- dynamic test (PDT) is an experimental technique for simulating the earthquake response of structures and structural components in time domain. A CFST-RC pier is a modified form of CFST laced column in which CFST members are connected with RC web in longitudinal direction and with steel tube in transverse direction. For this study, a CFST -RC pier is tested under three different earthquake time histories having scaled PGA of 0.05g. From the experiment acceleration, velocity, displacement and load time histories are observed. The dynamic magnification factors for acceleration due to Chamoli, Gorkha and Wenchuan ground motions are observed as 12, 10 and 10 respectively. The frequency of the pier is found to be 1.42 Hz. The result shows that this type of pier has excellent static and earthquake resistant properties.

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