A radiophysical method of measuring small mechanical vibrations

1969 ◽  
Vol 9 (6) ◽  
pp. 689-691
Author(s):  
V. B. Braginskii ◽  
A. B. Manukin
Keyword(s):  
Mechanical Vibrations ◽  
Radiophysical Method

scholarly journals Model approach for electromagnetically excited mechanical vibrations in direct-drive wind turbines

2020 ◽  
Vol 1618 ◽  
pp. 022060
Author(s):  
Christoph Mülder ◽  
Tobias Duda ◽  
Georg Jacobs ◽  
Kay Hameyer
Keyword(s):  
Wind Turbines ◽  
Direct Drive ◽  
Mechanical Vibrations ◽  
Model Approach

The effect of vibratory conditioning on tensile strength and microstructure of 1018 mild steel

2020 ◽  
Vol 17 (6) ◽  
pp. 837-844 ◽  
Author(s):  
Venkata Suresh Bade ◽  
Srinivasa Rao P. ◽  
Govinda Rao P.
Keyword(s):  
Tensile Strength ◽  
Mild Steel ◽  
Fusion Zone ◽  
Dc Motor ◽  
Grain Structure ◽  
Internal Stresses ◽  
Skilled Workers ◽  
Mechanical Vibrations ◽  
Content Type ◽  
Weld Defects

Purpose The purpose of this paper is to investigate the prominence of mechanical excitations at the time of welding. In the past years, the process of welding technology has expanded its influence in manufacturing. The crucial drawback of conventional welding is prompted by internal stresses and distortions, which is the focal reason for weld defects. These weld defects can be diminished by the process called post-weld heat treatment (PWHT), which consumes more working hours and needs skilled workers. To replace these PWHT processes, mechanical vibrations are introduced during the process of welding to diminish these weld defects. Design/methodology/approach In the current research, the mechanical vibrations are transferred to weld-pool through vibro-motor and DC motor connected to the electrode. As per standards, the tensile test specimens were prepared for welding with different voltages of vibro-motor and DC motor respectively. The weld joints were tested for tensile strength and analyzed the microstructure at the fusion zone. Findings Melt-ability at fusion zone of 1018 mild steel was investigated by the single-stroke intense heat process of fusion welding. It is observed that the mechanical vibrations technique has a profound influence on the enhancement of the fusion zone characteristics and grain structure. The peak value of the tensile strength is observed at 100 s of vibration, 190 V of vibro-motor voltage and 18 V of electrode voltage. The tensile strength of the welded joints with vibrations is increased up to 22.64% when it is compared with conventional welding. The enhancement of the tensile strength of the weld bead was obtained because of the formation of fine grain structure. So, mechanical vibrations are identified as the most convenient method for improving the mild steel alloys weld quality. Originality/value A novel approach called mechanical vibrations during the process of welding is implemented for fusion zone refinement.

scholarly journals Research on impacts of mechanical vibrations on the production machine to its rate of change of technical state

2016 ◽  
Vol 8 (7) ◽  
pp. 168781401665577 ◽  
Author(s):  
Štefánia Salokyová ◽  
Radoslav Krehel’ ◽  
Martin Pollák ◽  
Marek Kočiško
Keyword(s):  
Rate Of Change ◽  
Technical State ◽  
Mechanical Vibrations

scholarly journals XVII.—The Superposition of Mechanical Vibrations (Electric Oscillations) upon Magnetisation, and Conversely, in Iron, Steel, and Nickel

1907 ◽  
Vol 45 (2) ◽  
pp. 491-517
Author(s):  
James Russell
Keyword(s):  
Magnetic Field ◽  
Magnetic Induction ◽  
Simple Experiment ◽  
Earth’S Magnetic Field ◽  
Mechanical Vibrations ◽  
Subsequent Work ◽  
Magnetic Condition ◽  
Earth's Magnetic Field ◽  
Mechanical Disturbances

That mechanical vibrations affect magnetisation has long been known. The simple experiment of hammering an iron rod (Gilbert) in the earth's magnetic field needs only to be mentionedAbout twenty years ago Ewing published investigations upon the effects of vibrations on magnetism. These have been summarised in his subsequent work, Magnetic Induction in Iron and other Metals. He states (§ 84, 3rd ed.) that the “influence of vibrations and mechanical disturbances generally” “may be succinctly described by saying that vibration lessens those differences of magnetic condition to which hysteresis gives rise. Thus, if we tap a piece of iron during the application and removal of a magnetising force, we find at each stage of the application that tapping increases the susceptibility, and at each stage of the removal it reduces the retentiveness.”

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