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Analysis and comparison of vibration signals from internal combustion engine acquired using piezoelectric and MEMS accelerometers

Bismor Dariusz

Vibrations in Physical Systems

2019

Vol. 30, nr 1

art. no. 2019112

Condition monitoring of vehicles with internal combustion engine is of immense importance due to high number of vehicles with such engines and their importance to transport and economy. As many persons use a vehicle which is old and inexpensive, a condition monitoring system designed for such vehicles cannot be expensive. Unfortunately, condition monitoring of engines is usually based on the use of vibration signals, which are acquired by accelerometers. Piezoelectric accelerometers are the most commonly used for this purpose, and such accelerometers are not cheap. However, an alternative exists in the form of microelectromechanical systems (MEMS) accelerometers, which are much cheaper, but have narrower frequency characteristics. This paper describes preliminary results of a research on feasibility of use of MEMS accelerometers for condition monitoring and failure detection in internal combustion engines.

Accuracy and repeatability tests on 6D measurement arm

Rakowski P., Kobierska A., Podsędkowski L., Poryzała P.

Mechanics and Mechanical Engineering

2017

Vol. 21, nr 2

425--436

We present kinematic structure of measurement arm along with its construction restrains originating from using only accelerometers for determining relative positions of links. Method of calculating position of arm's end in relation to its base basing on orientation of individual links is presented. Accuracy and repeatability tests were performed using custom made test stand. The description of test stand, measurements procedures for last link changing its position in Cartesian directions and orientation in vertical axis is also included in the paper. These changes were justified in context of links orientation in relations to global coordinate system. Obtained tests results are presented and analyzed.

On Improving Performance of MEMS Accelerometers in Tilt Sensing

Łuczak S.

Machine Dynamics Problems

2006

Vol. 30, No. 4

37-47

The most significant methods of increasing accuracy of tilt measurements have been presented in the paper. The measurements referred to are to be performed under quasi-static conditions by means of miniature tilt sensors built of MEMS accelerometers. Some of the methods consist in modifications of the existing MEMS accelerometers, whereas the other can be useful while using other types of commercially available accelerometers, including those manufactured with application of conventional technologies.