Results 21 to 30 of about 10,905 (259)

Evaluation of Walnut Kernel Quality (as Degree of Crushing) Obtained Under Impact Loading

Journal of Agricultural Machinery, 2014
In this research the quality of walnut kernels under impact loading were studied. Due to unavailability of specific varieties of walnut in Iran, the tests were carried out on the available genotypes.
Kh Mohammadi Ghermezgholi, H.R Ghassemzadeh, H Navid, M Moghaddam, H Ghaffari   +4 more
doaj   +1 more source

THE STUDY OF ROAD PAVEMENT PERFORMANCE THROUGH IMPACT HAMMER TESTS

International Conference “Environmental Engineering”, 2020
Noise pollution has become an important issue. One of the main sources of noise in residential areas is represented by transportation and by the interaction between tyre and road surface. Several studies illustrate that traffic noise is affected by road properties such as acoustic absorption, surface texture, and mechanical impedance.
Filippo Giammaria Pratico, Gianfranco Pellicano, Rosario Fedele   +2 more
openaire   +3 more sources

Constant Strain Rate Uniaxial Compression of Green Sandstone during SHPB Tests Driven by Pendulum Hammer

Shock and Vibration, 2017
During the Split-Hopkinson pressure bar (SHPB) tests driven by pendulum hammer, employing a proper special shape striker is an effective way to obtain dynamic stress equilibrium condition and to get constant strain rate of the rock specimen.
S. H. Li, W. C. Zhu, L. L. Niu, F. Dai
doaj   +1 more source

Concrete Object Anomaly Detection Using a Nondestructive Automatic Oscillating Impact-Echo Device

Applied Sciences, 2019
The goal of this study was to develop an impact-echo device that can conduct automatic oscillation tests, process signals rapidly, and apply it to concrete object anomaly analysis.
Hsi-Chiang Chou
doaj   +1 more source

Impact noise test method using a modified hammer machine [PDF]

The Journal of the Acoustical Society of America, 1975
The current national (ASTM E-492) and international (ISO-R140/R717) impact method involves the use of a standard hammer machine for evaluating the impact noise isolation of floor/ceiling structure. The method has been severely criticized on the ground that ratings based on the test data correlate poorly with the subjective judgments of people listening
openaire   +1 more source

New tools for structural testing - Piezoelectric impact hammers and acceleration rate sensors [PDF]

35th Aerospace Sciences Meeting and Exhibit, 1997
Small-sizeultra-high-precision mechanical systems demand special testing methodologies, such as a betterhighfrequency response, a precise impact position, an extremely high repeatability, etc. Utilizing the fact that signals obtained from piezoelectric sensing elements are strongly ine uenced by the interfacing circuitry, piezoelectric sensors that can
C. Lee, C. Lin, C. Hsiao, W. Liaw, C. Lee, C. Lin, C. Hsiao, W. Liaw   +7 more
openaire   +2 more sources

Prediction Model of Drilling Performance for Percussive Rock Drilling Tool

Advances in Civil Engineering, 2020
This study suggests a method for quantitatively estimating the drilling performance of the down-the-hole (DTH) hammer during percussive drilling of rock surfaces. A pneumatic dynamic model of the DTH hammer was developed that considers the mass flow rate
Dae-Ji Kim, Jaewon Kim, Booyeong Lee, Min-Seok Shin, Joo-Young Oh, Jung-Woo Cho, Changheon Song   +6 more
doaj   +1 more source

Impact Resistance Test and Numerical Simulation Study of Scrap Steel Fiber Rubber Concrete

Buildings
The scrap steel fibers (SSF) produced by mechanical processing are processed and added to rubber concrete (RC) to make scrap steel fiber rubber concrete (SSFRC), so as to enhance the strength of the rubber concrete.
Mingshuai Li, Yongtao Gao, Chengzhao Wang, Youzhi Li, Tao Fan   +4 more
doaj   +1 more source

Comparative Shear Tests of Bolt Rods Under Static and Dynamic Loading

Studia Geotechnica et Mechanica, 2020
This article presents the methodology and results of single shear tests of bolt rods under dynamic impact loading generated by means of a drop hammer. Comparative analysis was also performed for bolt rod load capacity, stress and shear work under static ...
Pytlik Andrzej
doaj   +1 more source

On an Impact Testing Machine of Drop Hammer Type

journal of the Japan Society for Testing Materials, 1961
In order to research on the behaviors of destruction of carbon steel forgings by impact bending, we designed an impact testing machine of drop hammer type. The total height of this testing machine is about 5m. The weights of the used drop hammers are 12.5, 25 and 50kg respectively. The maximum distance from the position of test piece to the drop hammer
Sadatoshi INADA, Koichi AKIZONO, Koji HANAOKA   +2 more
openaire   +2 more sources