Application of vibroacoustic diagnostics to evaluation of wear of friction pads rail brake disc

Sawczuk, Wojciech

doi:10.17531/ein.2016.4.11

Cited by 11 publications

(11 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A general form of the determination of the average value of the friction coefficient is expressed by equations (22) and (23). Equation 22is based on two linear functions and equation 23 The analyses of the results in the domain of amplitudes have shown that, based on the point measures of vibration accelerations of the brake system discussed in the paper, a diagnostic of the brake conditions is possible as described earlier in [15], [28], [31], including the assessment of the braking process through the determination of the average friction coefficient. Table 2. and Table 3.…”

Section: Analysis Of the Resultsmentioning

confidence: 99%

“…One of the clasps was fitted with the vibration transducer shown in Fig.4.a). The measurements of the vibration accelerations were performed perpendicularly to the surface of the disc based on the experience of other researchers presented in [28], [32]. Fig.5.…”

Section: Methodology and Object Of Researchmentioning

confidence: 99%

“…10 km/h following the drop in the efficiency of the electrodynamic brake. Due to the use of two braking systems, the work on vibroacoustic diagnostics (VA) of traction motors is presented in the works [10], [11], [12] or friction discs described in the works [28], [30].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Application of Vibration Accelerations in the Assessment of Average Friction Coefficient of a Railway Brake Disc

Sawczuk

2017

Measurement Science Review

Self Cite

View full text Add to dashboard Cite

Due to their wide range of friction characteristics resulting from the application of different friction materials and good heat dissipation conditions, railway disc brakes have long replaced block brakes in many rail vehicles. A block brake still remains in use, however, in low speed cargo trains. The paper presents the assessment of the braking process through the analysis of vibrations generated by the components of the brake system during braking. It presents a possibility of a wider application of vibroacoustic diagnostics (VA), which aside from the assessment of technical conditions (wear of brake pads) also enables the determination of the changes of the average friction coefficient as a function of the braking onset speed. Vibration signals of XYZ were measured and analyzed. The analysis of the results has shown that there is a relation between the values of the point measures and the wear of the brake pads.

show abstract

Section: Analysis Of the Resultsmentioning

confidence: 99%

Section: Methodology and Object Of Researchmentioning

confidence: 99%

See 1 more Smart Citation

The Application of Vibration Accelerations in the Assessment of Average Friction Coefficient of a Railway Brake Disc

Sawczuk

2017

Measurement Science Review

Self Cite

View full text Add to dashboard Cite

show abstract

“…In addition, the functions and indicators of reliability until the first damage can be used to assess the reliability of renewable objects in the initial period of their exploitation, i.e. until the first damage occurs [14,15].…”

Section: Reliability Characteristics For Renewable Objectsmentioning

confidence: 99%

Method of reduction of diagnostic parameters during observation on the example of a combustion engine

Orczyk

Tomaszewski

2017

MATEC Web Conf.

View full text Add to dashboard Cite

Abstract. The article presents a method of selecting diagnostic parameters which map the process of damaging the object. This method consists in calculating, during the observation, the correlation coefficient between the intensity of damage and the individual diagnostic parameters; and discarding of those parameters whose correlation coefficient values are outside of the narrowest confidence interval of the correlation coefficient. The characteristic feature of this method is that the parameters are reduced during the diagnostic experiment. The essence of the proposed method is illustrated by the vibration diagnosis of an internal combustion engine.

show abstract

“…The paper [ 12 ] presents the analysis of vibration acceleration signals in the frequency domain using band filters, from which the effective value of vibration accelerations was determined. The work [ 13 ] contains the results of the analysis in the amplitudes domain using known measures. For the purpose of the diagnosis of friction lining wear, the article analyzes such measures as the effective value of vibration acceleration (A RMS ), the average value (A AVERAGE ), the root value (A SQUARE ), and the peak value of the vibration acceleration (A PEAK ).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Wear of Disc Brake Friction Linings and the Variability of the Friction Coefficient on the Basis of Vibroacoustic Signals

Sawczuk

Ulbrich

Kowalczyk

et al. 2021

Sensors

Self Cite

View full text Add to dashboard Cite

The article presents the results of friction and vibroacoustic tests of a railway disc brake carried out on a brake stand. The vibration signal generated by the friction linings provides information on their wear and offers evaluation of the braking process, i.e., changes in the average friction coefficient. The algorithm presents simple regression linear and non-linear models for the thickness of the friction linings and the average coefficient of friction based on the effective value of vibration acceleration. The vibration acceleration signals were analyzed in the amplitude and frequency domains. In both cases, satisfactory values of the dynamics of changes above 6 dB were obtained. In the case of spectral analysis using a mid-band filter, more accurate models of the friction lining thickness and the average coefficient of friction were obtained. However, the spectral analysis does not allow the estimation of the lining thickness and the friction coefficient at low braking speeds, i.e., 50 and 80 km/h. The analysis of amplitudes leads to the determination of models in the entire braking speed range from 50 to 200 km/h, despite the lower accuracy compared to the model, based on the spectral analysis. The vibroacoustic literature presents methods of diagnosis of the wear of various machine elements such as bearings or friction linings, based on amplitude or frequency analysis of vibrations. These signal analysis methods have their limitations with regard to their scope of use and the accuracy of diagnosis. There are no cases of simultaneous use of different methods of analysis. This article presents the simultaneous application of the amplitude and frequency methods in the analysis of vibroacoustic signals generated by brake linings. Moreover, algorithms for assessing the wear of friction linings and the average coefficient of friction were presented. The algorithm enables determination of the time at which the friction linings should be replaced with new ones. The final algorithm analyzes the vibration acceleration signals using both amplitude analysis for low braking speeds, as well as spectral analysis for medium and high braking speeds.

show abstract

Application of vibroacoustic diagnostics to evaluation of wear of friction pads rail brake disc

Cited by 11 publications

References 10 publications

The Application of Vibration Accelerations in the Assessment of Average Friction Coefficient of a Railway Brake Disc

The Application of Vibration Accelerations in the Assessment of Average Friction Coefficient of a Railway Brake Disc

Method of reduction of diagnostic parameters during observation on the example of a combustion engine

Evaluation of Wear of Disc Brake Friction Linings and the Variability of the Friction Coefficient on the Basis of Vibroacoustic Signals

Contact Info

Product

Resources

About