Acoustics on a Real Scale Model: Application to Fractured Media

Flame stretching in a room with a ceiling vent will be discussed in this short note. A real-scale model was constructed with a gasoline pool fire placed inside. Another pool fire of the same size and amount of fuel was burnt outside the model. Different pool sizes of diameters 0.07 m, 0.08 m, 0.11 m, 0.16 m and 0.2 m were set up. Volume of gasoline varied from 30 ml to 500 ml to give different burning durations. The flame lengths of the two fires were measured and compared. It is observed that the flame length of the pool fire inside the room was over 20% higher than that outside at the later stage of the fire.

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Fire Spread of Thermal Insulation Materials in the Ceiling of Piloti-Type Structure: Comparison of Numerical Simulation and Experimental Fire Tests Using Small- and Real-Scale Models

Sustainability ◽

10.3390/su11123389 ◽

2019 ◽

Vol 11 (12) ◽

pp. 3389

Author(s):

Heong-Won Suh ◽

Su-Min Im ◽

Tae-Hoon Park ◽

Hyung-Jun Kim ◽

Hong-Sik Kim ◽

...

Keyword(s):

Thermal Insulation ◽

Fire Test ◽

Fire Spread ◽

Scale Model ◽

Fire Intensity ◽

Small Scale ◽

Insulation Material ◽

Fire Tests ◽

Insulation Materials ◽

Real Scale

Large-scale fires mainly due to the ignition of thermal insulation materials in the ceiling of piloti-type structures are becoming frequent. However, the fire spread in these cases is not well understood. Herein we performed small-scale and real-scale model tests, and numerical simulations using a fire dynamics simulator (FDS). The experimental and FDS results were compared to elucidate fire spread and effects of thermal insulation materials on it. Comparison of real-scale fire test and FDS results revealed that extruded polystyrene (XPS) thermal insulation material generated additional ignition sources above the ceiling materials upon melting and propagated and sustained the fire. Deformation of these materials during fire test generated gaps, and combustible gases leaked out to cause fire spread. When the ceiling materials collapsed, air flew in through the gaps, leading to flashover that rapidly increased fire intensity and degree of spread. Although the variations of temperatures in real-scale fire test and FDS analysis were approximately similar, melting of XPS and generation of ignition sources could not be reproduced using FDS. Thus, artificial settings that increase the size and intensity of ignition sources at the appropriate moment in FDS were needed to achieve results comparable to those recorded by heat detectors in real-scale fire tests.

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A 3D Biohybrid Real‐Scale Model of the Brain Cancer Microenvironment for Advanced In Vitro Testing

Advanced Materials Technologies ◽

10.1002/admt.202000540 ◽

2020 ◽

Vol 5 (10) ◽

pp. 2000540 ◽

Cited By ~ 1

Author(s):

Omar Tricinci ◽

Daniele De Pasquale ◽

Attilio Marino ◽

Matteo Battaglini ◽

Carlotta Pucci ◽

...

Keyword(s):

Brain Cancer ◽

Scale Model ◽

In Vitro Testing ◽

Cancer Microenvironment ◽

The Brain ◽

Real Scale

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Structural Health Monitoring on Real Scale Model of a Masonry Triumphal Arch

Damage Assessment of Structures VII - Key Engineering Materials ◽

10.4028/0-87849-444-8.279 ◽

2007 ◽

pp. 279-284

Author(s):

Giovanni Damonte ◽

Stefano Podestà ◽

Giuseppe Riotto ◽

Sergio Lagomarsino ◽

Georges Magonette ◽

...

Keyword(s):

Structural Health Monitoring ◽

Health Monitoring ◽

Scale Model ◽

Structural Health ◽

Real Scale

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Benefits and applications of laser-induced sparks in real scale model measurements

The Journal of the Acoustical Society of America ◽

10.1121/1.4929623 ◽

2015 ◽

Vol 138 (3) ◽

pp. EL175-EL180 ◽

Cited By ~ 2

Author(s):

Javier Gómez-Bolaños ◽

Symeon Delikaris-Manias ◽

Ville Pulkki ◽

Joona Eskelinen ◽

Edward Hæggström ◽

...

Keyword(s):

Scale Model ◽

Real Scale

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Structural Health Monitoring on Real Scale Model of a Masonry Triumphal Arch

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.347.279 ◽

2007 ◽

Vol 347 ◽

pp. 279-284

Author(s):

Giovanni Damonte ◽

Stefano Podestà ◽

Giuseppe Riotto ◽

Sergio Lagomarsino ◽

Georges Magonette ◽

...

Keyword(s):

Structural Health Monitoring ◽

Health Monitoring ◽

Dynamic Behaviour ◽

Structural Safety ◽

Scale Model ◽

Research Centre ◽

Structural Dynamic ◽

Measurement Variability ◽

Structural Health ◽

Real Scale

Monitoring represents one solution for the safeguard of historical buildings. The need for a non-destructive and comprehensive monitoring methodology suggests using related to Structural Health Monitoring. This paper is intended to present the outcomes of an experimental campaign on a masonry triumphal arch representing a real scale model of a church part, which was built outside ELSA laboratory at the Joint Research Centre of European Commission. This study aims to evaluate the damage pattern of the structure through simplified dynamic methods producing a quick evaluation of structural safety, easy to use on real cases. As in traditional monitoring, both the instrumentation precision and the measurement variability due to the different testing condition (e.g. ambient conditions) have to be considered. The related effects on the structural dynamic behaviour were analysed and evaluated in order to distinguish an effective change in the “structural health” (a real damage) from an alteration caused by external conditions (a “false positive”). Once studied such effects, settlements were induced to one column base through an “ad hoc” device. Varying the settlement width, three damage levels were obtained in the structure. For each state the structural dynamic properties and their variation were evaluated. Sensitivity of dynamic behaviour to structural damage and to its changes was analysed comparing the results for each level.

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Une analyse numérique des possibilités de résonance d'un bassin portuaire de profondeur variable

Canadian Journal of Civil Engineering ◽

10.1139/l89-076 ◽

1989 ◽

Vol 16 (4) ◽

pp. 467-476

Author(s):

Najat Serhir-Taleb ◽

Claude Marche

Keyword(s):

Numerical Model ◽

Analytical Method ◽

Ocean Waves ◽

Scale Model ◽

Small Scale ◽

Direct Measure ◽

Model Application ◽

Analyse Numérique ◽

Resonance Modes ◽

Small Scale Model

Creating, enlarging and excavating a harbour can modify the dynamic response of the basin. A verification of the resonance modes is common practice before undertaking the related work. This can be done numerically if the necessary assumptions are justifiable. It can be done on a small-scale model if the basin has an irregular shape or if the depth varies from one area to the other.A computer-programmed analytical method of resonance modes is presented. It is derived from the direct measure principle of successive oscillation superposition used in the laboratory. Validation is obtained by applying the method to existing theoretical solutions and to the analysis of a small creek of the Gaspe Peninsula where the importance of refraction in the analytical results is demonstrated. Key words: harbour, vibration, agitation, ocean waves, diffraction, refraction, numerical model, application. [Journal translation]

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