The effect of material properties on reducing intermediate blast noise

Raspet, Richard; Butler, Paul D.; Jahani, F.

doi:10.1016/0003-682x(87)90042-9

Cited by 12 publications

(8 citation statements)

References 2 publications

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“…Solid tamping (removed particles, drilling detail) contains a minor volumetric concentration of air (а1 = 0,01-0,1 share units) and therefore its density is from 1.6 to 2.0 g/cm3 and tamping on a liquid basis at changing the volume of the air concentration (а1) is from 0.05 to 0.95 share units the density of the mixture decreases from 0.92 to 0.06 g/cm3. It was found [8][9] that viscous properties can have a noticeable effect on the laws of the explosive waves spread and on the intensity of their fading with distance, and mechanical air foam can be compressed under the influence of a shock wave with the absorption of its energy and adjustment of the cellular structure [10][11][12][13][14][15][16].…”

Section: Resultsmentioning

confidence: 99%

The Change of the Spatial Parameters of the Destruction of the Rock mass by Borehole Charge with Low-Density Tamping

Katanov

2018

E3S Web Conf.

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Abstract. Explosive destruction of the rock formation is substantiated by several theories developed by well-known scientists. The improvement of quality of preparation of rock mass to excavation, by an excavator without an increase in the value of specific consumption of explosives is important in the present time. Traditionally, to increase the impact time of detonation products on the rock hard tamping was used. The problem is in the rational redistribution of the explosion energy due to the use of a borehole charge, and in particular, in the tamping of low-density, porous materials. The more intensive attenuation of the mass velocity of particles in the material of such tamping in comparison with the mass velocity of the rock mass particles contributes to the well channel compression and increases the impact time of detonation products on the rock mass. As a result of redistribution of energy of detonation products, the specific impulse of explosion increases. The value of the radius of the controlled crushing zone increases by more than 1.6 times. The results of industrial explosions in coal mines have confirmed the theoretical reasoning.

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Section: Resultsmentioning

confidence: 99%

The Change of the Spatial Parameters of the Destruction of the Rock mass by Borehole Charge with Low-Density Tamping

Katanov

2018

E3S Web Conf.

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“…These studies mainly focus on the propagating behavior of blast sound [11,12] and methods of quantifying the community's response to the gun blast noise [3][4][5][6]. In contrast, the investigation for means of mitigating the noise has not received extensive attention although some primitive work has been reported [13][14][15][16]. The reason for this is probably due to the difficulties of the problem, resulting from the intensive energy and low frequencies and the limit of means which can be used [17].…”

Section: Introductionmentioning

confidence: 91%

A study for sound wave scattering by corrugated ground with complex trench structures

Tong

Ting

Chew

et al. 2009

Waves in Random and Complex Media

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Several trench structures in corrugated ground are investigated for the possibility of mitigating gun blast noise by numerical simulations. The blast noise usually includes large explosive energy with nonlinearity in the near field and exhibits a very lowfrequency spectrum. In this study, the linearity approximation for the noise is taken because the nonlinearity of the wave reaching the scatterer is not serious for many proved guns and the low-frequency characteristic is concentrated. The structures are designed based on the surface impedance design approach proposed in our previous work and arbitrary three-dimensional (3D) geometries within a truncated ground are now assumed. The acoustic characteristic of the structures is evaluated by using a fast numerical solver. The solver employs the multilevel fast multipole algorithm (MLFMA) as an accelerator and can solve very large acoustic wave scattering problems with millions of unknowns on workstations within several days. This tool allows us to truncate the ground as large as needed for accurate modeling. Four structures are mainly considered in the design, namely, concentric trenches, sectorial trapezoidal trenches, interlaced arc trenches and parabolic reflectors. Some of them may have a sloped inner wall or tilted surface as a means of adjustment. Numerical simulations show that the concentric trench design has a very good mitigation behavior for linear and continuous noise sources and the structure is further studied for mitigating real-world gun blast noise.

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“…Funkcje te spełniają m.in. materiały poliuretanowe: pianki elastyczne, pianki sztywne i poliuretanowe elastomery [3][4][5][6][7][8][9][10][11][12][13]. W aplikacjach, w których jest konieczne tłumienie ener-gii uderzenia wykorzystuje się też ciecze zagęszczane ścinaniem i konstrukcje pianek auksetycznych z tymi cieczami [14,15].…”

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Polyurethane composite structures with 3D fabrics

et al. 2018

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Przedmiotem badań były poliuretany (PUR) zaliczane do grupy materiałów absorbujących energię, o potencjalnym zastosowaniu do wytwarzania elementów konstrukcji tarcz chroniących ratowników przed falą uderzeniową. W celu zwiększenia zdolności tych materiałów do absorpcji energii na ich bazie wykonano struktury kompozytowe z udziałem poliestrowych tkanin 3D. Do badań użyto poliuretanów o różnej twardości (40, 85 i 95 ShA). Testy udarnościowe przeprowadzono dwiema metodami z wykorzystaniem kolumnowego młota udarowego Dynatup 9250HV i stanowiska do badania zdolności do pochłaniania siły uderzenia, zbudowanego na podstawie brytyjskiej normy BS 7971-4:2002. Oceniane próbki poliuretanów o różnej twardości cechowała podobna zdolność do absorpcji energii (powyżej 82 J), natomiast kompozyty na osnowie poliuretanowej z udziałem tkaniny poliestrowej 3D akumulowały większą ilość energii uderzenia (powyżej 87 J).

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The effect of material properties on reducing intermediate blast noise

Cited by 12 publications

References 2 publications

The Change of the Spatial Parameters of the Destruction of the Rock mass by Borehole Charge with Low-Density Tamping

The Change of the Spatial Parameters of the Destruction of the Rock mass by Borehole Charge with Low-Density Tamping

A study for sound wave scattering by corrugated ground with complex trench structures

Polyurethane composite structures with 3D fabrics

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