Jacek Rysiński

Diagnostics of Scoring in Gears

In the paper, the scoring phenomenon appearing on the surfaces of meshing teeth and the conditions of its initiation are presented. The methodology of detection of this phenomenon is proposed. Based on the formulated methodology, it is possible to determine the condition of a gear by means of the reliability function.

Diagnostics of gears and compressors by means of advanced automatic system

Abstract In the present paper, the diagnostics problems of gears and air-compressors are discussed. The diagnostics has been performed by means of wireless system WiViD. This system is a unique design solution, in which several functions are divided and performer by two separate devices. The mentioned device functions are as follows: data handling, processing, their analysis and presentation. In the paper, own measurement procedures were created, checked and presented. The evaluation of technical conditions of some devices was done based upon the registered diagnostic symptoms, which were compared with the allowable limits.

Application of Distributed System in Control and Diagnostic Toothed Gears

This chapter contains an analysis of a system for gear control and diagnosis using Ethernet-based distributed control system. Own-designed and made test stand was presented along with a concept of the device protection system operation.

Diagnostics of machine parts by means of reverse engineering procedures

In this article, an application of a three-dimensional scanner for building a special diagnostic stand is described. An experimental method of detection of material defects is discussed. The considered defects are connected with cooperation of particular surfaces of machine parts. In the discussed experiments, particularly the dimensions of pitting holes can be evaluated. Availability of laboratory facilities required that the investigations were performed using geared wheels. The three-dimensional model which represents a degenerated surface, obtained based upon the diagnostic measurements, was compared with the pattern of an undamaged surface. The latter was generated by means of our pre-processor. The pre-processor enables generation of files which are compatible with the majority of the computer-aided design system formats. Therefore, the analyses were performed by means of commercial system inventor and computer-aided three-dimensional interactive application.

Model of Fatigue Damage Accumulation

In this paper, the analytical method of fatigue life estimation of gear teeth is proposed. The computational model of fatigue damage accumulation was built using the adequate NASGRO 2/3 formula, moreover Formans and Paris-Erdogans laws were utilized for comparison. The ranges of stress intensity factor were determined using the boundary element method.

Evaluation of Fatigue Life of Cylindrical Geared Wheels

The main aim of the work is determination of numerical and numerical-analytical methods of evaluation of fatigue strength and life of geared tooth considering tooth breakage phenomenon. The discussed tasks were performed using the following tools: dual boundary element method, BEASY package as well as fracture mechanics

Probability of the Critical Length of a Fatigue Crack Occurring at the Tooth Foot of Cylindrical Geared Wheels of the Drive System of a Fiomax 2000 Ring Spinner

In the present paper, we describe a method of determination of the probability of reaching the critical crack length at the tooth root of the cylindrical geared wheels of the drive system of the Fiomax 2000 ring spinner. The Paris-Erdogan formula was utilised for calculations of the fatigue crack length depending on the number of load cycles. Experimental investigations were performed on cylindrical geared wheels. The wheel specimens were manufactured from 1.6523 steel (UE) according to a technical specification relevant to the drive system of the ring spinner. The experiments were performed using a professional pulsator (pulsating test machine). Based upon the experiments (series of 12 tests), material constants and were calculated. These parameters were utilised in the Paris law of crack propagation for further calculations. Moreover it was also ascertained that these unknowns are related via the deterministic relationship. Therefore a function allowing for approximation of constant in dependence on exponent m was derived. In the next step, for the values of parameter chosen – belonging to the variability interval, established from experimental data – we determined the times of reaching the critical length of the fatigue crack. It was stated that the best approximation distribution describing the simulated random values of times of reaching the critical length of the tooth crack for the drive system of the ring spinner is the asymptotic Gumbel’s distribution. Knowing the distribution and number of cycles until reaching the critical crack length at the tooth root, one can evaluate the fatigue life of the damaged wheel in the ring spinner (Fiomax) drive system for the assumed probability. The goal of the present paper is evaluation of the working time of the elements of the drive system of a ring spinner until the occurrence of damage. The highest fatigue life of geared wheels was achieved within the interval (4.3 – 4.5)x 105 cycles. However, it is recommended to change of the geared wheel in case of the spotting of early symptoms of defect. For the stretching apparatus, the authors of the present paper suggest the exchange of the idler geared wheels at least once per year.

Kinetics of Fatigue Crack Propagation at the Tooth Root of a Cylindrical Gear Wheel

The present paper proposes an analytical method for determining the course (path) of crack propagation. A fatigue crack arises at the tooth root of a cylindrical geared wheel due to loading connected with gear work conditions. The cracking model was built using the adequate NASGRO2/3 formula; moreover, for comparison purposes, Forman and Paris-Erdogan’s laws were utilized. The length of an increase (propagation) in the crack was directly calculated by means of the boundary element method.

Influence of Teeth Manufacturing Tolerances of Cylindrical Geared Wheels on Gear Operating Characteristics Based on Spinner Stretching Apparatus

In the paper, issues related to the errors and inaccuracies resulting from improper operation of the drive system of the stretching apparatus of a ring spinner are discussed. The aim of the paper was an analysis of a design solution for the driving system of a ring spinner and its operating behaviour influencing the quality parameters of the fiber jet. In the paper, modelling of the involute teeth shape by means of a BEASY package was done. Based on the model prepared, an assessment of the sensivity of geometrical teeth outline on particular dynamical quantities for the gear of the stretching apparatus was performed. An improvement in the parameters of operating of the spinner can be achieved via changing of the design characteristics of elements of the driving system; in particular, modification of the teeth shape was considered. Within the scope of the work, numerical analyses of the meshing geared wheels were conducted taking into consideration the unevenness of operating of the drive system as well as load distribution acting along the line of action. In the paper, the boundary element method was utilised for evaluation of the load distribution in relation to spectral analysis connected with the unevenness of the fibers’ jet mass.