Simultaneous Durability Assessment and Relative Random Analysis Under Base Shake Loading Conditions

Datta, Sandip; Bishop, Neil; Sweitzer, Karl; Atkins, Alexander

doi:10.4271/2017-01-0339

Cited by 17 publications

(6 citation statements)

References 12 publications

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“…Those theories were known as PSD cycle counter. Among the PSD cycle counter, the well-known algorithms were Lalanne, narrow band, and Dirlik approaches [23].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…Lalanne approach proposed that the probability density function of stress range (S) is given by [23]:…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…Apart from Lalanne and Dirlik, it is worth to mention one of the fundamental approaches in frequency domain which was the narrow band approach. Narrow band was proposed by Bendat based on the work by Rice, where the PSD stress responses are calculated, as follows [23]:…”

Section: Theoretical Backgroundmentioning

confidence: 99%

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Vibration Fatigue Analysis of Carbon Steel Coil Spring under Various Road Excitations

Kong

Abdullah

Schramm

et al. 2018

Metals

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This paper presents the evaluation of frequency-based approach predicted spring using acceleration signals that were collected from various road conditions. Random loadings in the forms of acceleration are nominal and more flexible for vehicle components fatigue assessment. In this analysis, the strain time history of the spring and acceleration signals of the suspension strut was measured from three different road conditions. The acceleration signals were then transformed into power spectra density (PSD). PSD cycle counter, like Lalanne, Dirlik, and narrow band approach, was applied to obtain equivalent load cycles. The stress response was obtained through having the equivalent load cycles with a spring modal frequency response function (FRF) and different stress criterion, like absolute maximum principal and critical plane approaches. Then, the stress response was used to predict the spring fatigue life using stress-life (S-N) approach. The results revealed that the harshest road condition was the rural road where the spring with fatigue life of 4.47 × 107 blocks to failure was obtained. The strain predicted fatigue life was used to validate the frequency-based predictions using a conservative approach. It was found that the Dirlik approach has shown the closest results to the strain life approach, which suggested that the Dirlik approach could be used for spring fatigue life prediction with the acceptable accuracy.

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“…Those theories were known as PSD cycle counter. Among the PSD cycle counter, the well-known algorithms were Lalanne, narrow band, and Dirlik approaches [23].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…Lalanne approach proposed that the probability density function of stress range (S) is given by [23]:…”

Section: Theoretical Backgroundmentioning

confidence: 99%

See 1 more Smart Citation

Vibration Fatigue Analysis of Carbon Steel Coil Spring under Various Road Excitations

Kong

Abdullah

Schramm

et al. 2018

Metals

View full text Add to dashboard Cite

show abstract

“…This is a major limitation of the narrow-band approach. In this method, the power spectral density (PSD) stress responses are calculated by the expression below [ 50 ]:

where

represents the number of stress cycles per second and

describes the probability density function of stress range, m 0 , m 1 , m 2 , m 4 are spectral moments, and

represents the expected number of peaks.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…In the Lalanne approach, the probability density function for a stress range ( S ) is expressed as below [ 50 ]:

…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Vibration-Based Fatigue Analysis of Octet-Truss Lattice Infill Blades for Utilization in Turbine Rotors

et al. 2022

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Vibration fatigue characteristics are critical for rotating machinery components such as turbine rotor blades. Lattice structures are gaining popularity in engineering applications due to their unique ability to reduce weight and improve the mechanical properties. This study is an experimental investigation of octet-truss lattice structure utilization in turbine rotor blades for weight reduction and to improve vibration fatigue characteristics. One completely solid and three lattice infilled blades with variable strut thickness were manufactured via additive manufacturing. Both free and forced experimental vibration analyses were performed on the blades to investigate their modal and vibration fatigue characteristics. The blades were subjected to random vibration using a vibration shaker. The response was measured using a triaxial accelerometer in terms of vibration acceleration time histories in the X, Y, and Z directions. Results indicate a weight reduction of up to 24.91% and enhancement in the first natural frequency of up to 5.29% were achieved using lattice infilled blades. The fatigue life of the blades was investigated using three frequency domain approaches, namely, Lalanne, Dirlik and narrow band. The fatigue life results indicate that the 0.25 mm lattice blade exhibits the highest fatigue life, while the solid blade exhibits the lowest fatigue life of all four blades. The fatigue life of the 0.25 mm lattice blade was 1822-, 1802-, and 1819- fold higher compared to that of the solid blade, using the Lalanne, Dirlik, and narrow-band approaches, respectively. These results can serve as the first step towards the utilization of lattice structures in turbine blades, with thermal analysis as the next step. Therefore, apart from being light weight, the octet-truss lattice infilled blades exhibited superior vibration fatigue characteristics to vibration loads, thereby making them a potential replacement for solid blades in turbine rotors.

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Vibration fatigue analysis through frequency response function of variable amplitude loading

et al. 2022

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Simultaneous Durability Assessment and Relative Random Analysis Under Base Shake Loading Conditions

Cited by 17 publications

References 12 publications

Vibration Fatigue Analysis of Carbon Steel Coil Spring under Various Road Excitations

Vibration Fatigue Analysis of Carbon Steel Coil Spring under Various Road Excitations

Vibration-Based Fatigue Analysis of Octet-Truss Lattice Infill Blades for Utilization in Turbine Rotors

Vibration fatigue analysis through frequency response function of variable amplitude loading

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