Jan Furch

Identification of the Technical Condition of Roller Bearings by means of Vibrodiagnostics and Tribodiagnostics

This paper focuses on determining the technical condition of a bearing box in the vehicle by means of vibrodiagnostics. In the next step, we determined the technical condition of roller bearings in the bearing box by measuring the vibration signal. One of the possibilities of determining the technical condition, including the location of accelerometers, the arrangement of relevant measured devices, and the analysis of frequency spectrum, is described in the paper. The aim of the experiment was to measure vibrations of the bearings placed in the vehicle bearing box and then to carry out the analysis of the measured data. The second part of the paper presents the analysis of samples of the plastic lubricant used for lubricating the tested roller bearings. For the analysis, we used an AES Spectroil Q100 device which works on the principle of atomic spectral analysis.

Using Telemetry for Maintenance of Special Military Vehicles

This article suggests using telemetry during the diagnostics of a technical state and the maintenance of combat and special vehicles including autonomous vehicles and UGV. The aim of this article is to show different possibilities of performing a predictive and later a proactive maintenance in the military environment. When performing an on-line diagnostics, combat and special vehicles have to be equipped with diagnostic and sensor networks. When it comes to harmonizing vehicle networks, it is important for the diagnostic protocols of military vehicles to comply with relevant standards. If the inner vehicle communication and relating diagnostics possibilities are perfectly in line with relevant standards, and a logistic personnel is equipped with a suitable off-line diagnostics, sufficient conditions will be created for implementing a predictive or a proactive maintenance. In this paper the authors describe the possibilities of on-board diagnostics followed by data processing and transferring to create a convenient maintenance system. This system is expected to provide a high level of dependability (availability) and reduce overall maintenance costs. When implementing higher preventive maintenance systems it is essential to train a technical personnel and apply relevant hardware and software equipment.

Diagnostics of gear fault in four-speed gearbox using vibration signal

Fault detection using a vibration signal is considered to be one of the most important methods applied to rotating parts. Most of the rotating machine faults can be detected by this technique before dangerous situations occur. Although the vibration signal is easy to be measured and recorded, its analysis is by no means simple. Moreover, when applying this technique to a real object in the field, e.g. to a gearbox used in a military vehicle including main and transfer gearboxes, the vibration signals are modulated a lot. There are too many factors affecting the vibration signal and too many components that can generate a vibration, therefore the vibration analysis is usually difficult.

Identifying Technical Condition of Vehicle Gearbox Using Acoustic Emission

The article examines the technical condition of rotating parts using acoustic diagnostics. The measured object was a mechanical transmission of a field vehicle. Recently this method has been developing very quickly and is expected to be used not only for the signal analysis itself, but also for the failure occurrence prediction which is our aim in the future. In our article we observe the technical condition of a four-speed transmission and analyse the acoustic signal expressed by the root mean square of a noise level in decibels.