Irregular reflection of weak acoustic shock pulses on rigid boundaries

2016 ◽  
Vol 139 (4) ◽  
pp. 2207-2207
Author(s):  
Desjouy Cyril ◽  
Sébastien Ollivier ◽  
Olivier Marsden ◽  
Didier Dragna ◽  
Maria Karzova ◽  
...  
Keyword(s):  
Irregular Reflection ◽  
Shock Pulses

Irregular reflection of spark-generated shock pulses from a rigid surface: Mach-Zehnder interferometry measurements in air

2019 ◽  
Vol 145 (1) ◽  
pp. 26-35 ◽  
Author(s):  
Maria M. Karzova ◽  
Thomas Lechat ◽  
Sébastien Ollivier ◽  
Didier Dragna ◽  
Petr V. Yuldashev ◽  
...  
Keyword(s):  
Rigid Surface ◽  
Irregular Reflection ◽  
Shock Pulses

The use of optical methods for measuring irregular reflection of weak acoustic shock pulses from a solid surface in air

2017 ◽  
Vol 141 (5) ◽  
pp. 3730-3730
Author(s):  
Maria M. Karzova ◽  
Petr V. Yuldashev ◽  
Didier Dragna ◽  
Sébastien Ollivier ◽  
Vera Khokhlova ◽  
...  
Keyword(s):  
Solid Surface ◽  
Optical Methods ◽  
Irregular Reflection ◽  
Shock Pulses

scholarly journals Irregular reflection of weak acoustic shock pulses on rigid boundaries : Schlieren experiments and direct numerical simulation based on a Navier-Stokes solver

2016 ◽  
Vol 28 (2) ◽  
pp. 027102 ◽  
Author(s):  
Cyril Desjouy ◽  
Sébastien Ollivier ◽  
Olivier Marsden ◽  
Maria Karzova ◽  
Philippe Blanc-Benon
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Navier Stokes ◽  
Simulation Based ◽  
Irregular Reflection ◽  
Shock Pulses

scholarly journals Shock Pulse Shaping in a Small-Form Factor Velocity Amplifier

2010 ◽  
Vol 17 (6) ◽  
pp. 787-802 ◽  
Author(s):  
Gerard Kelly ◽  
Jeff Punch ◽  
Suresh Goyal ◽  
Michael Sheehy
Keyword(s):  
Pulse Shaping ◽  
Vertical Axis ◽  
Mechanical Shock ◽  
Practical Applications ◽  
Shock Testing ◽  
Acceleration Signal ◽  
High Acceleration ◽  
Component Assembly ◽  
Small Form Factor ◽  
Shock Pulses

This theme of this paper is the design and characterisation of a velocity amplifier (VAMP) machine for high-acceleration shock testing of micro-scale devices. The VAMP applies multiple sequential impacts to amplify velocity through a system of three progressively smaller masses constrained to move in the vertical axis. Repeatable, controlled, mechanical shock pulses are created through the metal-on-metal impact between pulse shaping test rods, which form part of the penultimate and ultimate masses. The objectives are to investigate the controllable parameters that affect the shock pulses induced on collision, namely; striker and incident test rod material; test rod length; pulse shaping mechanisms; and impact velocity. The optimum VAMP configuration was established as a 60 mm long titanium striker test rod and a 120 mm long titanium incident rod. This configuration exhibited an acceleration magnitude and a primary pulse duration range of 5,800–23,400 g and 28.0–44.0μs respectively. It was illustrated that the acceleration spectral content can be manipulated through control of the test rod material and length. This is critical in the context of practical applications, where it is postulated that the acceleration signal can be controlled to effectively excite specific components in a multi-component assembly affixed to the VAMP incident test rod.

scholarly journals Segregation of the bulk cargo on a belt conveyor under the vibro-pulse impact

2021 ◽  
Vol 303 ◽  
pp. 01044
Author(s):  
Alexander Zakharov ◽  
Natalya Erofeeva
Keyword(s):  
Negative Impact ◽  
Conveyor Belt ◽  
Shock Pulse ◽  
Belt Conveyor ◽  
Lower Face ◽  
Rotation Direction ◽  
Impact Device ◽  
Characteristic Points ◽  
Linear Sections ◽  
Shock Pulses

The dynamics of interaction of the large lumps of the bulk cargo with a conveyor belt while passing through roller supports of the conveyor linear sections is often a cause of damage on the conveyor belt. In order to reduce the negative impact it is proposed to isolate the conveyor belt surface from the large lumps by filling small fractions of the bulk cargo by means of adding a shock device to the conveyor structure that causes increased segregation of the bulk cargo. A mathematical model of the segregation of the bulk cargo located on the conveyor belt and in zone of impact of the shock pulses has been developed. The model considers a change in the rotation direction of the large lump when applying shock pulses to the characteristic points of the lump lower face. Herewith it takes into consideration weakening of the shock pulse by a layer of the bulk cargo small fractions. The presented model has received experimental confirmation. Analytically and experimentally the height of filling of the bulk cargo small fractions under a large lump when passing the vibrating impact device located on the conveyor belt has been determined.

scholarly journals Interaction between Shock Waves Travelling in the Same Direction

Fluids ◽  
2021 ◽  
Vol 6 (9) ◽  
pp. 315
Author(s):  
Pavel Bulat ◽  
Konstantin Volkov ◽  
Igor Volobuev
Keyword(s):  
Shock Waves ◽  
Contact Discontinuity ◽  
Jet Engines ◽  
Mach Stem ◽  
Regular Reflection ◽  
Reflected Shock ◽  
Different Types ◽  
Irregular Reflection

In this paper, we study the intersection (interaction) between several steady shocks traveling in the same direction. The interaction between overtaking shocks may be regular or irregular. In the case of regular reflection, the intersection of overtaking shocks leads to the formation of a resulting shock, contact discontinuity, and some reflected discontinuities. The type of discontinuity depends on the parameters of incoming shocks. At the irregular reflection, a Mach shock forms between incoming overtaking shocks. Reflected discontinuities come from the points of intersection of the Mach stem with the incoming shocks. We also consider the possible types of shockwave configurations that form both at regular and irregular interactions of several overtaking shocks. The regions of existence of overtaking shock waves with different types of reflected shock and the intensity of reflected shocks are defined. The results obtained in the study can potentially be useful for designing supersonic intakes and advanced jet engines.

scholarly journals Cavitation selectively reduces the negative-pressure phase of lithotripter shock pulses

2005 ◽  
Vol 6 (4) ◽  
pp. 280-286 ◽  
Author(s):  
Yuri A. Pishchalnikov ◽  
Oleg A. Sapozhnikov ◽  
Michael R. Bailey ◽  
Irina V. Pishchalnikova ◽  
James C. Williams ◽  
...  
Keyword(s):  
Negative Pressure ◽  
Pressure Phase ◽  
Shock Pulses
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