Influence of Working Fluid in the Throttle Channels of Hydraulic Mounts on the Damping Properties

Russian Engineering Research - The influence of the reduced mass of the working fluid in the throttle channels of a hydraulic mount on its motion and damping is considered. The acceleration and...     

The effect of gas inclusions on the parameters of hydraulic vibration mounts

Problems of improving damping characteristics of hydraulic vibration mounts are considered. It is shown that, when there are nondissolved air bubbles present in a working fluid, damping characteristics are not weakened but improved significantly in a number of cases. Testing of a hydraulic vibration mount was carried out at a vibration test stand within a frequency range from 20 to 55 Hz. The vibration frequency of the vibration test stand platform was measured discretely with a step of 5 Hz. As soon as the stand’s input vibration signal was not a purely harmonic one, harmonic components from 0.5 to 100 Hz were present in its spectrum. This frequency range was exposed to spectral and cepstral processing. It was determined that efficient vibration suppression with presence of gas cavities with a total volume of 5 mL occurs in the whole range of harmonic change.     

Synchronization of two motors on an elastic base

Effects associated with the synchronization of two motors on an elastic base are investigated. Spectral analysis reveals informative harmonics that permit determination of the order in which the motors must be switched on prior to synchronization.     

On developing a magnetorheological transformer that operates in orthogonal magnetic fields

The operation of a magnetorheological transformer in which choke channels are replaced with a cylindrical clearance between two coaxial cylinders is considered. The cylindrical clearance, as well as the working and compensation chambers, are filled with a magnetorheological fluid. It has been shown that this design of the magnetorheological transformer is preferable for damping impact loads.     

Long-term sealing loss of hydraulic bearings

The factors responsible for the loss of sealing of hydraulic bearings in long-term operation are considered. The appearance of cavitation zones in the working fluid of hydraulic bearings and microscopic hydraulic bearings is explained.     

Dampening characteristics of rope vibroisolators

We consider the spectral characteristics of rope vibroisolators. In rope vibroisolators, the vibration energy is absorbed at the expense of the dry friction between the separate elastic wires in the strands of the steel rope system. We have performed experiments in conditions fully identical to those in the hydro-support tests performed earlier [1]. We have found that, under the equality of the spectral constituents of the input vibrosignals, the spectra of the output signals of the rope vibroisolators differ sufficiently from the output signals of the hydro-supports obtained earlier [2–4].     

Reducing Transient Vibrations due to Rotating Shafts

An approach is proposed for calculating the transient torque imbalance of rotating shafts in the diesel generators of autonomous power units. The maximum shear strain of the rotor shaft in the generator is assessed by the finite-element method.     

Damping of vibrations at resonant frequencies of electrical systems

Attention focuses on reducing the vibration of energy-intensive electrical systems, such as the power units of autonomous vehicles. The amplitude–frequency spectra of input and output vibrational signals for hydraulic vibrational bearings and cable vibrational dampers are investigated. Cable vibrational dampers are more effective in quenching impact loads, while hydraulic vibrational bearings are better at suppressing long-term vibration.