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Shock and Vibration Applications

Drop Testing

This drop test was designed by the packaging research and development team at Unilever to solve a packaging mystery: cases of Axe shampoo were arriving at retail outlets with the caps open and the shampoo leaking. Packaging engineers performed drop tests using ProAnalyst motion analysis software. ProAnalyst's 1-D line tracking is used to divide the bottle into segments with dynamic length measurement to show the effects of the shock. As you can see in the video, there is a significant amount of deformation in the plastic bottle as it falls on a hard surface. This unacceptable amount of compression caused the bottle caps to pop open and the contents to leak out. Unilever redesigned the product packaging to solve the problem.

Engine Combustion

In this video of fuel combustion in an engine, there are no distinct features to be tracked. However, ProAnalyst's dynamic edge detection can track the leading edge of a flame as it expands out from the center by tracking the black to white transition. A best-fit circle is used to track and measure the radial expansion of the wavefront.

Spiderweb Deformation

Biology professor Dr. Todd Blackledge of the University of Akron studies spiders and their webs. In this video, the tensile strength of an Orb-weaver spider's web is tested. The researchers place prey insects onto the webs to create impact motion and displacement. Later, the videos are analyzed with ProAnalyst to calculate the exact amount of web displacement. The research team chose ProAnalyst for its perspective calibration and multi-point tracking abilities. Perspective calibration is perfect for videos filmed using non-perpendicular camera angles. ProAnalyst can track over 70 unique points on the web simultaneously.

Shockwave

In this video of a Department of Homeland Security law enforcement test provided by Vision Research, the car explosion creates a powerful detonation wave traveling at supersonic velocity from its point of origin. In this controlled explosion conducted at a professional test range, ProAnalyst's markerless 1-D line tracking automatically tracks the speed of the shock wave as it expands and the aftermath of the blast. ProAnalyst also measures the latency between the explosion and the position of the shockwave. ProAnalyst motion analysis software from Xcitex is the industry-leading software for researchers studying shock and vibration events.

Wall Mining

This video of wall mining was filmed in Australia using a Redlake camera at a distance of 1 kilometer. In this video, ProAnalyst's 1-D line tracking and 2-D feature tracking show the effects of blasting a rock wall during a mining operation. 1-D Line Tracking was used to track the displacement of the mountainside as the explosion occurs. The size of the debris cloud increases as the face of the wall is blown away. The 2-D analysis was accomplished by embedding barrels covered with fluorescent paint in the rock wall. The sinusoidal motion of the barrels is caused by camera vibration from the shockwave. ProAnalyst's Image Stabilization toolkit was used to remove the vibration from the video. Similar techniques are useful for other types of mining processes, such as strip mining. This is a great example of test results that can be obtained only with the use of high-speed video motion analysis.

Model Building Integrity Testing

This video, highlighting the research of Dr. Sara Wadia-Fascetti, professor of Civil and Environmental Engineering at Northeastern University, illustrates the vibration effects and structural performance of a model building under conditions simulating the 1995 earthquake in Kobe, Japan (magnitude 6.8). This structural model is approximately 1.8 meters tall, resting on a shaker table measuring approximately 75 square centimeters. The model features an active mass damping mechanism at the top, allowing ProAnalyst to monitor the position, direction, velocity and acceleration of the seismic forces affecting the structure as the simulated earthquake takes place. Pro Analyst's 1-D Line Tracking tools provide non-linear analysis of the motion of walls and stress points without the imposition of physical markers or sensors (accelerometers).

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