Structural Testing: Mechanical Mobility Measurements
Structural testing part two deals with mechanical mobility measurements are an important stage of the engineering design process for dynamic mechanical structures. Determination of the dynamic characteristics of structures, including noise and vibration, can be used to improve and optimize the structural performance.
Modal Analysis and Simulation: Structural Testing - Part II
Modal analysis of the data obtained from structural testing, provides us with a definitive description of the response of a structure, which can be evaluated against design specifications. It also enables us to construct a powerful tool, the modal model, with which we can investigate the effects of structural modifications or predict how the structure will perform under changed operating conditions.
Static and Dynamic Balancing of Rigid Rotors
Unbalance is the most common source of vibration in machines with rotating parts. It is a very important factor to be considered in modern machine design, especially where high speed and reliability are significant considerations. Balancing of rotors prevents excessive loading of bearings and avoids fatigue failure, thus increasing the useful life of machinery.
Static And Dynamic Balancing On Rotating Machinery
Many people are needlessly apprehensive of performing their own dynamic balancing procedure. This application note will demonstrate with the aid of several worked examples, how easy it is to balance rotating machinery. Straightforward methods will be presented that makes use of simple, Brüel & Kjær instrumentation to measure on rotating parts running in their own bearings at normal operating speeds.
History of the Piezoelectric Accelerometer
The World’s first commercial piezoelectric accelerometer was developed by Dr. Per V. Brüel in 1943. This was only the first of many innovations, that would shape the world of test and measurement, we know today. Explore the great history of the piezoelectric accelerometer, and the many innovations that followed, solidifying Brüel & Kjær as the the primary source of sound and vibration measurement technology.
Easy Rider? Measuring Motorbike Vibrations
If you ride a motorbike for any length of time, you might notice that vibration from the engine causes hand numbness – or white-finger syndrome – and other unpleasant physical sensations. Vibration levels can have a negative impact on health and on a rider’s reactions, contributing to accidents.
Vibraton Analysis Helps Neutrino Experiment
Fermilab is America’s leading particle physics laboratory and operates the world’s most advanced particle accelerators. Scientists use particle accelerators to research some of the least understood particles in the universe: Neutrinos. A vibration analysis project recently helped discover the cause of a small fracture in the powerful magnetic horn used to send neutrino beams to Minnesota.
Good Vibrations - Interview With Doctor Nielsen
What happens when a budding rock star trades in his electric guitar for medical books? In Peter Michael Nielsen’s case, the result is an invention that relieves pain in a unique way.
Accelerometer Mounting Check (AMC)
To achieve accuracy in all measurements, the physical mounting of accelerometers on a test structure is the first, and often most problematic link in the measurement chain. Problems here will corrupt the measurement and cannot be corrected later.
Developing a Smoother Ride With Anti-vibration Rubber
Supporting safer and more comfortable vehicles, Sumitomo Riko uses advanced polymer materials and comprehensive evaluation technology to manufacture anti-vibration rubber for the automotive industry.
Five Questions for Niels-Jørgen
Born on the Danish island of Bornholm, Niels-Jørgen Jacobsen is Brüel & Kjær’s Product Manager for Structural Dynamics. This Wagner aficionado is also a self-confessed foodie with a dream of starting his own winery. He also runs marathons, believing that good health is synonymous with a good life.
Japanese Professor of Human Vibration
When a typhoon wreaked havoc during his formative years, Dr Setsuo Maeda altered the course of his career, resolving to help Japanese workers in the clean-up effort by reducing their vibration injuries. He went on to spearhead Japan’s adoption of ISO standardisation in the area, and now teaches a sought-after course that prepares Japanese students for the globalised world.We caught up with Dr Setsuo Maeda in his office at Kinki University, 560 km west of Tokyo in Osaka Prefecture. Surrounded by shelves of...
The Humble Guru of Structural Dynamics
A brilliant mathematician, the Vold in Vold-Kalman, developer of groundbreaking algorithms, patent holder, published author, award winner and former infantryman – the knowledge, skills, experience and achievements of this ´60% retired` 72-year-old Norwegian are endless.