in this work an improved method for designing a linear vibrational absorber, excited by random vibrations is presented and analyzed. first, analytical expressions, for non-stationary white noise accelerations, are derived. the criterion is different from the conventional criteria, used for structural design under random vibration, and it is based on minimum displacement or acceleration response...

Shigeru MURAMATSU, Chief Engineer Masafumi FUKUSHIMA, Chief Engineer Hiroshi MATSUNAGA, Engineer, Compressor Division, (PANASONIC), Noji-cho, This study presents experimental results on the rotary crankshaft behavior, the cylinder pressure and mechanical vibrations o£ a rolling-piston rotary compressor after shut down of the motor. It is shown as a conclusion that the most importantfactor chara...

This paper reports a microfabricated piezoelectric MEMS inertial energy harvester that can scavenge high-frequency mechanical vibrations in all three dimensions with an active inner volume of only 55 mm. The device can generate 0.1 to 10.5 μW from out-of-plane vibrations (365-465 Hz), and 0.1 to 3.2 μW from in-plane vibrations (680-930 Hz) at 0.5 g acceleration input. The reported harvester is ...

Suzanne: Indeed, there are other species of birds related to peacocks that use feather vibrations in a very similar way during mating displays, including the Great Argus and a variety of Peacock Pheasants. Some birds species have feathers that make sounds due to vibrations driven by the passage of air over the feathers during flight,while others drive the vibrations using specially adapted feat...

Tissue engineering is a promising approach for articular cartilage repair; however, it still has proven a challenge to produce tissue from the limited number of cells that can be extracted from a single individual. Relatively few cell expansion methods exist without the problems of dedifferentiation and/or loss of potency. Previously, it has been shown that mechanical vibrations can enhance cho...

We propose a novel method of heart attack treatment by low frequency diastolic timed vibrations. It can be applied quickly after the onset of symptoms by unspecialized personnel drastically improving the survival chances of the patient. The method is based on applying low frequency mechanical vibrations in synchronization with the heart cycle of the patient to facilitate disruption and clearanc...