Acoustic methods for measuring bullet velocity Michael Courtney Ballistics Testing Group, PO Box 24, West Point, NY 10996 Michael_Courtney alummitedu Abstract This article describes two acoustic methods to measure bullet velocity with an accuracy of 1 or better In one method, a microphone is placed within 01 m of the gun muzzle and a bullet...
CALCULATION OF DRILLING AND BLASTING PARAMETERS FOR QUARRY DOBRNJA NEAR BANJA LUKA Kova čevi ć Žarko 1, Čelebi ć Miodrag 1, Toši ć Dražena 1 1Rudarski fakultet Prijedor, Email zarkokovacevic hotmail ABSTRACT Using of explosives in modern mining is very important for the good, efficient and rational organization...
By measuring the velocity of the vibrations induced by each hole in the blast, you can calculate the required timing delay between holes or the required distance between holes and rows Since vibrations diminish as they travel farther away from the blast, you need a geophone that can record vibrations in close proximity to the blast...
Large quarry blast pattern measuring 600 by 100 by 48 ft-----Delays, in milliseconds----- 173 Distribution of inclined holes for a road cut in uneven topography Regular hole array dis 173 torted to fit topography----- 173 Charge distribution in bench blasting-----...
Case Study Selection of Blasting Limits for Quarries and ,
Blast-induced ground vibration can be measured in three different ways as acceleration, velocity and displacement Acceleration is a measure of how quickly the point of interest changes velocity over a ,...
This shows the wavetrace for a Rhyodacite Quarry where 108 holes in 2 rows were fired with an average charge mass of 127 kg per hole The monitoring station was at a distance of 335 metr...
TIMING OF QUARRY BLASTS AND ITS IMPACT ON SEISMIC ,
higher values of particle velocity in any blasting presented above in intervals listed above up to the , TIMING OF QUARRY BLASTS AND ITS IMPACT ON SEISMIC EFFECTS 157 Fig 1 Graphical recordings 1 blasting, , blasting - Včeláre quarry after Dojčár and Pandula, 1998...
velocity, which is the speed at which each particle in the ground oscillates as the wave motion pass This would be similar to measuring the speed of a fishing bobber in a pond as it moves up and down when a ripple passes under it Particle velocity is measured in inches per sec-ond, but beyond several hundred feet from a blast the...
Ultrasonic Waves in Mining Application , measurement of ultrasonic pulse velocity in these materials can often be used to indicate , the test results performed both in the laborato ry and a marble quarry will be discussed When ultrasonic testing is applied ,...
Rock breakage from explosives blasting services commonly happens in three steps The first round of detonations crushes the rock in proximity of the hole-wall Next, compressive stress waves are created through explosives blasting and spread in all directions with velocity equal to the sonic wave velocity of the rock material...
drilling and blasting powerpoint 2003 1 seminar ondrilling blasting equipments 2008-09 by yogesh s ghule veermata jijabai technological institute civil and environmental engineering department 2...
Velocity and Displacement 6 Measurement Units , in component feeders, concrete compactors, ultrasonic cleaning baths, rock drills and pile drivers Vibration test- , The Vibration Parameters, Acceleration, Velocity and Displacement Measuring Units When we looked at ,...
The blast media type, shape, size, density, and hardness, along with media acceleration and volume of media, combined with blasting distance from the workpiece, angle of impact and time cycles are important factors in the blast process capabiliti The blasting equipment is produced to deliver, reclaim and contain the media, contain...
blasting projects, regular construction blasting, quarry blasting, and mining operations around the world , Velocity is a measure of the distance that could be traveled by particles in 1 second, measured in inches/sec ips also , frequencies can be so high that normal equipment cannot measure the level...
Velocity, or Displacement parameters By detecting vibratory acceleration we are not tied to that parameter alone, with electronic integrators we can convert the acceleration signal to velocity and displace- ment Most modern vibration meters are equipped to measure all three parameters Where a single, wide frequency band vibration measure-...
Air Flow Measurement Instruments How Precise and Accurate? Calculating flow rates through ducts, pipes, hoods and stacks collectively called ducts for our purposes , has never been difficult The cross-sectional area of the duct is multiplied by the average air velocity to find the volume per time or flow rate...
An integrated approach of signature hole vibration ,
ABSTRACT In an urban production quarry, blasting close to a city boundary requires management of the vibration peak particle velocity of vector sum PVS Blasting is required to come within 30 meters of the boundary An optimal technical solution was obtained through an integrated approach of signa-ture hole vibration monitoring and modeling...
Equipment for measuring sonic velocity in quarry blasting
equipment for measuring sonic velocity in quarry blasting blasting projects, regular construction blasting, quarry blasting, and mining operations around the world , Velocity is a measure of the distance that could be traveled by particles in 1 second, measured in inches/sec ips also , frequencies can be so high that normal equipment cannot ....
The blasting seismograph vibration monitor example photo at left is the most commonly used tool for measuring vibration and determining compliance with ground vibration standards It is used in both blasting and construction settings, in spite of some serious limitations in recording construction vibration...
ROCK BREAKAGE AND BLAST DESIGN CONSIDERATIONS IN OPENPIT ,
Oct 12, 2012 0183 32 ROCK BREAKAGE AND BLAST DESIGN CONSIDERATIONS IN OPENPIT PARTHA DAS SHARMA 1 Explosives Energy Release and Rock Breakage Mechanism of rock breakage while release of Explosives energy upon detonation and other relevant points are discussed below When an explosive charge is detonated, chemical reaction occur which, very rapidly changes the solid or liquid ,...
Ideal for measuring material thickness when only one side of the material is accessible, the ultrasonic thickness gauges can measure the material thickness and sound velocity of ,...
Vibration Measurement Equipment and Vibration Sensor Technology Vibration is measured as an acceleration, velocity, or displacement Each has advantages and disadvantages and each vibration measurement unit can be converted to the others although ,...
It is usually performed with a triaxial velocity sensor, with a full range of 250 mm/s 10 in/s , with the main axis oriented in the direction of the blast Air pressure monitoring It is realized with a high pressure microphone able to measure up to 150 dB L , oriented in the direction of the blast...
Vibration monitoring is the measurement and recording of passing movements in the ground or in a structure, using a seismograph like the one shown at left, or ,...
Ground Vibration and Airblast Limits for Blasting in Mines ,
Is the maximum noise level in dB Lin Peak due to a blast measured anywhere on a sensitive site which is located at least 35 metres from any building or other acoustically reflective surface other than the ground Ground vibration Is the level of vibration peak particle velocity measured in mm/s inthe ground anywhere on a sensitive site...
For measurement of air velocity This digital ore wheel anemometer comes with built-in thermometer for measuring air velocity in for example ventilation ducts and air conditioning etc...
Measuring range 0 mm - 20 mm These gauges are best suited for measuring tough materials such as hardboard, sheet metal, panes of glass and wooden panels It is designed with a built-in digital or dial indicator, a lifting lever ....
for Quarry Blasting By Ken Logan Purpose of this talk , easily loaded using the equipment that is operated at the quarry face Key Considerations in Blast Design , Explosives with the same velocity of detonation can have different densities The use of Powder Factor in...
blasting projects, regular construction blasting, quarry blasting, and mining operations around the world , The propagation velocity is the speed at which the vibration waves travel As vibration waves travel away , frequencies can be so high that normal equipment cannot measure the level...
Soil and Structure Vibrations from Construction and ,
SOIL AND STRUCTURE VIBRATIONS FROM CONSTRUCTION AND INDUSTRIAL SOURCES Mark R Svinkin VIBRACONSULT, Cleveland, Ohio-USA 44118 , are potentially the most harmful part of ground vibrations from construction and industrial sources, these waves have the greatest , vibrations at distances 16-64 km from quarry blasting They detected ....
