This paper deals with the influence of the AC machine pole number on vibrations and noise of electromagnetic origin. First, rules of design of AC machines are reminded, pointing out the influence of the pole number. Then, the origin of magnetic vibrations and noise is explained. Analytical mechanical relations are given, allowing to estimate vibrations and noise of a machine. After that, the in...

We present a method for assessing an atomic force microscope’s (AFM’s) ability to reject externally applied vibrations. This method is demonstrated on one commercial and two prototype AFMs. For optimally functioning AFMs, we find that the response to externally applied vibrations obeys a 1/ω2 frequency dependence. This 1/ω2 frequency dependence can be understood by modelling the mechanical syst...

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 ...

We present a method to compute harmonic vibrations that uses the structures and the forces in the structures that are obtained from a geometry optimization. It does not require any additional electronic structure calculations. The method generally takes only on the order of minutes on a regular PC, but it does not guarantee the calculation of all vibrations of a system. Tests on small adsorbate...

Algorithms used to determine the vibrations to which hand-tool operators are exposed take into account only vibrations measured on a tool. Thus, the significant influence of constraints joining the elements of the tool-operator system is neglected. This paper attempts to determine the influence of grip on vibrations recorded both on the tool and on the limb. The estimation was based on the use ...

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...

A linear superposition method was used for modeling the time history of the production blast vibrations and optimizing the blast sequence to reduce vibration levels in Sar-Cheshmeh copper mine, Kerman, Iran. A single-hole blast for modeling and two double-hole blasts with time delays of 25 and 65 ms between two holes for modeling validation were carried out. The generated vibrations were measur...

This paper deals with the issue of mechanical vibrations in control of parallel robots. The proposed control strategy consists in a nonlinear adaptive dual mode controller applied to the actuation redundant parallel manipulator Par2. In this context, the experimental testbed is not equipped with velocity sensors. Therefore, a highgain observer has been used to estimate the articular velocities....