Dimension Reduction Techniques for Signal Separation Algorithms

Abouzid, Houda; Chakkor, Otman

doi:10.1007/978-3-319-96292-4_26

Cited by 5 publications

(3 citation statements)

References 12 publications

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“…For the evaluation of the frequency spectra from the resonance method, a feature extraction method was used to obtain the key characteristic parameters of the spectra under consideration. This method is commonly used during the dimensionality reduction of large datasets [ 25 ] and is widely used in the prediction of the lifetime of structures in both civil and mechanical engineering. Thus, in addition to the dominant resonant frequency, other parameters such as amplitude, peak width at mid-peak prominence, and peak prominence were extracted from all spectra.…”

Section: Methodsmentioning

confidence: 99%

Predicting the Durability of Solid Fired Bricks Using NDT Electroacoustic Methods

et al. 2022

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Historical buildings and monuments are largely made of brickwork. These buildings form the historical and artistic character of cities, and how we look after them is a reflection of our society. When assessing ceramic products, great emphasis is placed on their mechanical properties, whilst their durability is often neglected. However, the durability or resistance to weathering of masonry elements is just as important as their mechanical properties. Therefore, this work deals with predicting the durability of solid-fired bricks before they are used when reconstructing monuments and historical buildings. Durability prediction is assessed by identifying defects in the material’s internal structure. These faults may not be visible on the element’s surface and are difficult to detect. For this purpose, non-destructive electroacoustic methods, such as the resonant pulse method or the ultrasonic pulse method, were used. Based on an analysis of the initial and residual mechanical properties after freezing cycles, four durability classes of solid-fired bricks were determined. This work aimed to find a way to predict the durability (lifetime) of an anonymous solid-fired brick, expressed in terms of the number of freeze cycles the brick would last, based on non-destructive measurements.

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Section: Methodsmentioning

confidence: 99%

Predicting the Durability of Solid Fired Bricks Using NDT Electroacoustic Methods

et al. 2022

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“…For objective machine assessment of the optimal setup with variations in handle-tip-impact force, it is necessary to select suitable monitored signal parameters. In general, this means a reduction in dimensionality [ 34 ], which entails the search for a way to separate representative parameters, the so-called symptoms, from the complex comprehensive information. The term symptom extraction is derived from this.…”

Section: Equipment and Software Usedmentioning

confidence: 99%

Effect of Hammer Type on Generated Mechanical Signals in Impact-Echo Testing

Dvořák

Topolář

2021

Materials

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The impact-echo diagnostic method is a well-known nondestructive pulse compression test method, which can be relatively easily used for the testing of concrete and reinforced concrete elements. The evaluation of the measurement with this method is based on the analysis of the signal itself in the time and frequency domains. This allows acquisition of information on the velocity of the mechanical wave, the resonant frequency of the specimen or on the presence of internal defects. The ability to interpret these measurements depends on the experience of the diagnostic technician. The advent of classification algorithms in the field of machine learning has brought an increasing number of applications where the entire interpretation phase can be considerably simplified with the help of classification models. However, this automated evaluation procedure must be provided with the information of whether the signal acquired by the test equipment has actually been measured under optimally set conditions. This paper proposes a procedure for the mutual comparison of different measuring setups with a variable tip type, hammer handle and impact force. These three variables were used for a series of measurements which were subsequently compared with each other using multi-criteria evaluation. This offers a tool for the evaluation of measured data and their filtering. As an output of the designed method, each measurement is marked by a score value, which represents how well the acquired signal fit the weight demands for each observed feature of the signal. The method allows the adjustment of selected demands for a specific application by means of set thresholds. This approach enables the understanding of characteristics of the signal in the automated pre-processing of measured data, where computing power is limited. Thus, this solution is potentially suitable for remote long-term observations with sensor arrays or for acoustic emission signals pre-processing.

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“…2. In this paper were observed features such as: root mean square of signal (rms); dominant frequency (frequency); standard deviation of signal (std); mean of signal (mean); kurtosis of signal (kurt); skewness of signal (skew); clearance factor of signal; impulse factor; attenuation of signal [15].…”

mentioning

confidence: 99%

Comparison of Different Sensors Used in the Assessment of Concrete Elements by Impact-Echo Method

Puchýř

Dvořák

Hubáček

et al. 2022

Construction Technologies and Architecture

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Testing methods used for assessment of buildings considered as a cultural heritage are focused mainly on non-destructive testing methods. Old buildings are usually sensitive to destructive in-situ testing, and a variety of non-destructive techniques (NDT) are frequently used. One of the most commonly used sensors are accelerometers, which can measure vibrations of different part of structures. These can be used in either continuous monitoring or in short-time assessment. Impact-Echo is a well-known method which can locate defects, caverns, or damaged parts not only in industry-level structures, but also in preservation of cultural heritage. This type of measurement requires attaching a sensor to the surface of the observed element. This is in most cases done by adhesives which can damage the more porous structures. In this paper a comparison of two different sensor types in testing of reference concrete elements is presented: contact piezoceramic accelerometer; non-contact MEMS type microphone. Signals recorded by each sensor type are assessed by the statistical method of feature extraction.

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Dimension Reduction Techniques for Signal Separation Algorithms

Cited by 5 publications

References 12 publications

Predicting the Durability of Solid Fired Bricks Using NDT Electroacoustic Methods

Predicting the Durability of Solid Fired Bricks Using NDT Electroacoustic Methods

Effect of Hammer Type on Generated Mechanical Signals in Impact-Echo Testing

Comparison of Different Sensors Used in the Assessment of Concrete Elements by Impact-Echo Method

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