Fault Detection of Electric Impact Drills and Coffee Grinders Using Acoustic Signals

Głowacz, Adam

doi:10.3390/s19020269

Cited by 78 publications

(37 citation statements)

References 41 publications

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“…This is in agreement with the fact that when a charged ball moves to an electrode, the electrode will induce charges, and the induced charges will be reduced when the charged ball moves away from the electrode. By using Equation (19), the induced current change with the distance between the ball and the funnel is calculated and presented in Figure 21a. The simulated signal output after the charge amplifier is shown in Figure 21b.…”

Section: Resultsmentioning

confidence: 99%

“…A possible reason for this phenomenon could be that the charged ball experiences more resistance from the air with the increased velocity, which reduces the velocity of the ball to a level lower than theoretical calculations and hence less current is induced on the rod electrode. By using Equation (19), the induced current change with the distance between the ball and the funnel is calculated and presented in Figure 21a. The simulated signal output after the charge amplifier is shown in Figure 21b.…”

Section: Resultsmentioning

confidence: 99%

“…By comparing Figure 23a,c, it can be seen that the induced voltage increased significantly, mainly caused by an increased charge carried by the ball. This can be explained by Equation (19), which shows that the induced current is proportional to the amount of charge if other conditions remain unchanged. Taking the maximum value, minimum value, and measured value at four similar distances in Figure 23a,c, the results are summarized in Table 1.…”

Section: Resultsmentioning

confidence: 99%

“…Note that supporting rod 2 is made of insulating material to hold the rod electrode. In addition, supporting rods 1 and 2 are adjustable to a full 360 • , hence the horizontal distance between the small ball and the rod electrode can be adjusted by changing the angle between supporting rods 1 and 2; that is, parameter h in Equation (19).…”

Section: Methodsmentioning

confidence: 99%

“…In recent years, ring charge-sensing sensors have been widely utilized in the measurement of dilute phase/dense phase of gas-solid two-phase flow parameters [12][13][14]. At the same time, some modern signal processing algorithms have further improved the measurement accuracy [15][16][17][18][19]. For example, Wang et al [20] improved the measurement accuracy by applying the wavelet transform to the multiphase flow parameters.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Induced Charge Mechanism on a Rod Electrode

Cheng

et al. 2019

Electronics

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Rod electrodes based on an electrostatic induction mechanism are widely used in various industrial applications, but the analytic solution of an induced charge mechanism on a metal rod electrode has not yet been systematically established. In this paper, the theoretical model of the induced charge on a rod electrode is obtained through the method of images. Then, the properties of the rod electrode under the action of the point charge are studied, including the induced charge density distribution on the rod electrode, the amount of the induced charge with different diameters and lengths of the electrode, and the effective space region induced by the electrode. On this basis, a theoretical model of the induced current on a rod electrode is established, which is used to study the induced current properties by a moving point charge. It is found that both the magnitude and bandwidth of the induced current increase with the increased point charge velocity. Finally, three experimental studies are conducted, and the experimental results show good consistency with the analysis of the theoretical model, verifying the correctness, and accuracy of the model. In addition, the induced charge mechanism studied in this paper can act as an effective basis for the rod electrode sensor design in terms of the optimal radius and length.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of Induced Charge Mechanism on a Rod Electrode

Cheng

et al. 2019

Electronics

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Indian classical musical instrument classification using Timbral features

Gulhane

Shirbahadurkar

Badhe

2021

Concurrency and Computation

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Summary Musical instrument classification becomes effective when the music signal arrives with profound characteristics. This urged the researchers to develop an automatic system of recognizing the music signals and classify the instruments interplayed through the music. Thus, this paper proposes a model for the Indian music classification system using the optimization‐based stacked autoencoder. The significance of this research is based on the proposed Cuckoo‐dragonfly optimization (CuDro)‐based stacked autoencoder, where the proposed CuDro optimization trains the stacked autoencoder for acquiring accurate classification results. The proposed CuDro technique is the combination of the standard Cuckoo search (CS) and the Dragonfly algorithm (DA) that renders optimal weights for training the stacked autoencoder (SAE). Moreover, the musical instrument classification using the proposed CuDro‐based stack autoencoder is based on the compact features, such as Timbral features and proposed FrMkMFCC features, which further add value to this research. The Timbral features like Spectral flux, spectral kurtosis (SK), Spectral skewness, Spectral pitch similarity, Roughness, In harmonicity are added in the research for efficient musical instrument classification. The proposed FrMkMFCC feature is the integration of the Fractional Fourier transforms and Multi kernel method, and Mel Frequency Cepstral Coefficient (MFCC) features. The analysis using the developed classification methodology confirms that the proposed method acquired the maximum accuracy of 96.16%, the sensitivity of 86.86%, and specificity of 92.85%, respectively.

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Highly accelerated life testing (HALT): A review from a statistical perspective

Collins,

Huzurbazar,

Warr

2024

WIREs Computational Stats

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Despite its use in one form or another for at least four decades, HALT and related techniques [e.g., highly accelerated‐stress screening (HASS) and stress audits (HASA)] are not well understood within the statistical community and remain controversial. This largely reflects a conflict in motivation between engineers, testing under harsh conditions to discover and eliminate failure modes, and statisticians, taking a more cautious approach to develop quantitative estimates of parameters such as mean time between failures (MTBF). This review article will clarify HALT concepts and methods and explain where it fits within the universe of methods that involve the application of accelerating factors to compress the time required to evaluate or enhance product reliability. A major distinction is between methods such as HALT, a high‐stress test‐analyze‐fix‐test iterative process directed at improving reliability by discovering and fixing weak points in a design, and quantitative accelerated life testing (QALT), whose goal is the estimation of product life for a fixed design. We discuss methods such as physics of failure that offer some hope of bridging the gap between the qualitative nature of HALT, and purely quantitative statistical methods. We present a variety of engineering applications of HALT including metal fatigue, piping and pressure vessels, structural damage, radiation damage, and rotating machinery. We also discuss potential synergies between HALT and QALT, such as rapid identification, through HALT, of failure modes requiring quantitative analysis. For further study, extensive references to the applicable literature are provided as well as an appendix that describes related methods.This article is categorized under: Statistical and Graphical Methods of Data Analysis > Reliability, Survivability, and Quality Control

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Fault Detection of Electric Impact Drills and Coffee Grinders Using Acoustic Signals

Cited by 78 publications

References 41 publications

Investigation of Induced Charge Mechanism on a Rod Electrode

Investigation of Induced Charge Mechanism on a Rod Electrode

Indian classical musical instrument classification using Timbral features

Highly accelerated life testing (HALT): A review from a statistical perspective

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