Article by Jake

Aerostatic bearings test stand is built on the top of Rotor Kit, experimental workplace for rotor dynamics investigation and measurement (Fig. 2). The test shaft is supported by two rolling bearings, which are inserted into bearing bodies fastened to the frame. The test head with aerostatic bearing is located between rolling bearings. The rolling bearing outer diameter is smaller than test bearing diameter, so that the change of the bearing would be as simple as possible. Piezo-electric actuator for excitation of the bear-

Gas bearing can be loaded in two radial directions by static, harmonic or stochastic force by means of piezo-actuators, which is measured by force sensor. Redundant measurement of gas film thickness on several points of the gas bearing is provided. Assumptions in mathematical model are checked by measurement of acceleration on several points of the stand. Measurements are synchronized with rotor phase.

Aerostatic bearings identification approach was proposed. Experimental mechatronic stand based on Rotor Kit Nevada was designed, manufactured and tested. Further, its dynamic properties were evaluated to ensure they do not affect measured bearings.

The paper deals with the problems of material and processing parameters influence on axial compression values in the samples made from composites

designated for producing dielectromagnets. Shapes were manufactured

by injection moulding. The composite matrix constituted high- or low impact resistant polystyrene. As filler hard magnetic powders from Nd-Fe-B alloy were applied, having flake- or sphere-shaped grains. Tests were carried out on samples made from composites of various filler compactness

composite injection pressure values and temperatures of injected plastic compound. Samples made as described above were subject of axial compression test for laying down their strength value. The experiment results have shown that the most substantial influence on the deformation sequence and on the samples compression strength has the kind of composite matrix.

For performing of magnets alloys are used which are hard and bristle materials.

These features pose considerable difficulties in the manufacturing process of moulding the magnetic samples. Injected moulded dielectromagnets are made from composites, where the magnetic material is hard magnetic powder uniformly distributed in the matrix of thermoplast. Magnetic parameters of the dielectromagnets of this

kind are determined by the quantity of magnetic powder contained in the sample volume. This relationship is directly proportional. However, following

that is injection-mouldable. Excess quantity of the powder filler used causes that the composite loses the above mentioned quality. Hence there is a limit quantity of magnetic powder, which can be added to the polymer without affecting the composite ability of being injectionmouldable.

demanded. They are often subject to action of different forces, so it is necessary to know they response to these factors [1, 2].

Material of excellent magnetic properties is Nd-Fe-B alloy [3]. In the research

presented, the magnetic powders supplied by the Magnequentch International were applied, and namely of both; flake- (MQP-B) and spherical-

matrix was constituted by polystyrene supplied by the DWORY Co. [5]. For the experiments high impact polystyrene Owispol 825 and low impact strength one Owispol SX 25 were used.

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I’m Jake, which offers quality products such as Spy Camera Recorders, 7 Inch Tablet Pc, and many more. Know more , please visit 8 Inch Tablet Pc .

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