scholarly journals DEVELOPMENT OF ARTIFICIAL RAINFALL APPARATUS SIMULATING NATURAL RAINFALL : Sound radiation characteristics of lightweight roofs excited by rain Part 1

1993 ◽  
Vol 454 (0) ◽  
pp. 1-6
Author(s):  
Hiromi SUGA ◽  
Hideki TACHIBANA
Keyword(s):  
Sound Radiation ◽  
Radiation Characteristics ◽  
Natural Rainfall ◽  
Artificial Rainfall

Sound Radiation Characteristics of Lightweight Roof Constructions Excited by Rain

1994 ◽  
Vol 1 (4) ◽  
pp. 249-270 ◽  
Author(s):  
Hiromi Suga ◽  
Hideki Tachibana
Keyword(s):  
Transmission Loss ◽  
Power Level ◽  
Sound Radiation ◽  
Sound Intensity ◽  
Sound Power ◽  
Radiation Characteristics ◽  
Natural Rainfall ◽  
Artificial Rainfall ◽  
Sound Power Level ◽  
Measurement Results

In order to investigate the sound radiation characteristics of lightweight roof constructions when excited by rainfall, an artificial rainfall apparatus was constructed to simulate natural rainfall conditions. From the measurement results, it can be seen that the facility developed is practically applicable for the examination of the sound radiation characteristics of rain noise. It was therefore used in the measurement of sound power of 20 lightweight roofs. In addition, the relationship between sound power level and sound transmission loss measured by the sound intensity method was investigated statistically. As a result, it has been shown that a linear relationship exists between them and there is a possibility of estimating the sound power level from the transmission loss.

Analysis of Sound Radiation Characteristics of Rail by BEM.

1999 ◽  
Vol 65 (638) ◽  
pp. 3986-3991
Author(s):  
Mitsuru ENDO ◽  
Tsutomu NISHIGAKI ◽  
Ko MIZUNO
Keyword(s):  
Sound Radiation ◽  
Radiation Characteristics

Vibration and Sound Radiation Characteristics of Composite Flat-Panel Sound Radiator

2013 ◽  
Vol 431 ◽  
pp. 177-181
Author(s):  
C.H. Jiang ◽  
T.Y. Kam
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Response Spectrum ◽  
Sound Radiation ◽  
Laminated Composite ◽  
Element Model ◽  
Flat Panel ◽  
Radiation Characteristics ◽  
Experimental Approaches ◽  
Vibration And Sound Radiation

The vibration and sound radiation characteristics of laminated composite flat-panel sound radiators are studied via both theoretical and experimental approaches. In the theoretical study, a finite element model is presented to formulate the forced vibration of the sound radiators. The first Rayleigh integral is used to construct the sound pressure level curve of the sound radiators. In the experimental study, a laminated composite sound radiator was subjected to sweep sine excitation to determine the frequency response spectrum from which the natural frequencies of the sound radiator were identified. The sound radiator with salt powder distributed on its top surface was excited to generate the vibration shapes of the sound radiator at several selected frequencies. The SPL curve of the sound radiator was also measured experimentally. The experimental results are then used to verify the feasibility and accuracy of the proposed finite element model.

How the sound adjustment process of cymbals affects their vibration and sound radiation characteristics

2016 ◽  
Vol 140 (4) ◽  
pp. 3161-3161
Author(s):  
Fumiyasu Kuratani ◽  
Tatsuya Yoshida ◽  
Toshio Koide ◽  
Taiji Mizuta ◽  
Kozo Osamura
Keyword(s):  
Sound Radiation ◽  
Adjustment Process ◽  
Radiation Characteristics ◽  
Vibration And Sound Radiation

scholarly journals The Design and Check of Regional Typical Rainfall Processes: A Case Study of Yongnian District, China

2018 ◽  
Vol 246 ◽  
pp. 01009
Author(s):  
Zihao Man ◽  
Qinghua Luan ◽  
Dan Xu ◽  
Congwu Sun ◽  
Yongzhen Niu
Keyword(s):  
Regional Climate ◽  
Temporal Distribution ◽  
Regional Climate Change ◽  
Test Site ◽  
Climate Change Research ◽  
Flood Season ◽  
Natural Rainfall ◽  
Artificial Rainfall ◽  
Rainfall Volume ◽  
Local Water

Observing and analyzing runoff process is an important method to study the principle of runoff yield and concentration. However, natural rainfall is random and difficult to monitor the related runoff process timely, so most of the runoff processes analysis is based on the artificial rainfall experiments. In this study, the selected test site is located in Yongnian district, Hebei Province, China. Rainfall volume, rainfall peak, rainfall duration and peak ratio were considered as the key factors of designed rainfall type. Based on regional historical observed rainfall data from 1980 to 2012, the two mainly representative processes which was in flood season and non-flood season respectively, were calculated. The most typical rainfall process in each period was screened through two methods of characteristic frequency distribution. Furthermore, accuracy of rainfall intensity and uniformity of spatial and temporal distribution were selected as the criteria for correcting the artificial rainfall devices. This research is the foundation of the artificial runoff experiment and provide reference to regional climate change research and local water resources assessment.

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