The assessment of valve clearance in internal combustion engines based on parameters of vibration – methodological assumption

Abstract

In this article authors show the possibillities of using the parameters of vibration signals to estimate valve clearance in internal combustion engines. The main methodological assumptions of signal analysis and their results have been presented herein. The concept of research so as to solve the valve clearance diagnostic problem, based on the vibration signal, has been shown as well.

Estimation of fuel consumption in a jet engine based on vibration signal parameters

“…One method of describing vibration signals in the amplitude domain is the use of point measures [9,12,19]. They allow the vibration signal to be characterised by a single number.…”

Dynamic analysis of an internal combustion engine made in downsizing technology

“…The frequency bands were determined on the basis of scientific articles devoted to this topic [3,4]. The charts below show the vibration frequency ranges of individual components of the tested engine.…”

Assessment of the effectiveness of mounting the aircraft piston combustion engine on a test stand

“…Regardless of the research objectives and evaluation criteria as well as limiting conditions (internal and external), the primary action of the scientific approach to research on modern systems is to ensure the most faithful representation of the course of dynamic processes in operating and accompanying parameters, such as in the case of mapping: rotational speed or valve clearance of the engine in its vibration equivalent [2,7], identification of specific vibration parameters during the process of transporting ingredients of the feeding process [14] or bearing lubrication conditions [15], assessment of thermodynamic processes occurring in turbojet or piston engines [29,33], the impact of a specific fuel on the efficiency of the combustion process and emissions of harmful exhaust gas components [1820, 36]. This is particularly important in the case of diagnosis using vibroacoustic processes, which may have different partial goals and application areas, such as: searching for the most effective method of reducing the number of parameters used to evaluate [23], using vibrations to assess the operation of multi-stage wind turbine gearboxes [24,35], methodology for research process depending on the type of process and its nature [26], taking into account safety criteria in the diagnostic assessment [30], using the process of optimizing structures and systems with high dynamics of changes in thermodynamic processes [37].…”