The Spherical Shock Factor Theory of a FSP with an Underwater Added Structure

Guo, Jian; Yang, Yong; Zhang, Yin; Feng, Liang

doi:10.1155/2019/7080941

Cited by 4 publications

(5 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to Figure 9a in the literature [13], the maximum error in the transv direction is 19.3%, with a slope of 0.094. Similarly, the maximum error in the vertica rection is 11.02%, with a slope of 0.11.…”

Section: Shock Environment Predictionmentioning

confidence: 88%

“…The simulation data and forecasting method presented in Equation ( 6) from the literature [13] were compared to normal-distribution-based interpolated confidence intervals for validation.…”

Section: A Shock Environment Prediction Methods Based On Normal Distr...mentioning

confidence: 99%

“…These platforms allow for the testing of newly developed large shipboard equipment, including diesel engines and gas turbines. For a 200-tonne-class floating shock platform, Yang [13] investigated the shock of spherical factors on simulated shock environments, and analyzed the low-frequency response of the platform. Zhang [14] analyzed the low-frequency oscillator data of a 200-tonne floating shock platform used for underwater explosion testing.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Research on the Shock Environment Characteristics of a Marine Diesel Engine Based on a Large Floating Shock Platform

Zhang,

Li,

Zhang

et al. 2023

JMSE

View full text Add to dashboard Cite

To conduct a precise shock assessment of marine diesel engines, a 200 t floating shock platform was utilized to simulate realistic testing conditions. The testing generated the acceleration time curve and the shock response spectrum for the diesel engine. According to the applicable standards, the spectral velocity was chosen as the evaluation index, and an evaluation of the longitudinal, transverse, and vertical shock environment of the diesel engine was conducted. The shock factor interpolation method was corrected using the confidence interval based on normal distribution, and the interpolated confidence interval of the shock factor was determined. The findings reveal that shock waves were identified as the primary external force, and it was found that the influence of bubble pulsation can be disregarded when assessing a floating shock platform. This paper proposes the use of normal-distribution-based shock factor confidence intervals, which can accurately predict multidirectional shock factors and offer improved shock safety compared to the traditional method of unidirectional shock factor interpolation. The results and methods obtained in this study can provide valuable guidance and assistance for predicting the shock environment of large shipboard machinery on significant floating shock platforms.

show abstract

Section: Shock Environment Predictionmentioning

confidence: 88%

“…The simulation data and forecasting method presented in Equation ( 6) from the literature [13] were compared to normal-distribution-based interpolated confidence intervals for validation.…”

Section: A Shock Environment Prediction Methods Based On Normal Distr...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Research on the Shock Environment Characteristics of a Marine Diesel Engine Based on a Large Floating Shock Platform

Zhang,

Li,

Zhang

et al. 2023

JMSE

View full text Add to dashboard Cite

show abstract

“…On the other hand, Wang et al [22] investigated numerically and experimentally the failure mode and dynamic response of a ship structure subjected to shock wave and bubble pulse. Jun et al [23] investigated the impact environment characteristics of floating shock platform subject to UNDEX. Young and Leonard [24] modeled and simulate a surface ship shock to UNDEX, the results showed that the cavitation effect must be taken into account in the ship shock simulation, and that cavitation volume must be large enough.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis and Dynamic Response of Optimized Composite Cross Elliptical Pressure Hull Subject to Non-Contact Underwater Blast Loading

et al. 2019

View full text Add to dashboard Cite

Among the most important problems confronted by designers of submarines is to minimize the weight, increase the payload, and enhance the strength of pressure hull in order to sustain the hydrostatic pressure and underwater explosions (UNDEX). In this study, a Multiple Intersecting Cross Elliptical Pressure Hull (MICEPH) subjected to hydrostatic pressure was first optimized to increase the payload according to the design requirements. Thereafter, according to the optimum design results, a numerical analysis for the fluid structure interaction (FSI) phenomena and UNDEX were implemented using nonlinear finite element code ABAQUS/Explicit. The propagation of shock waves through the MICEPH was analyzed and the response modes (breathing, accordion and whipping) were discussed. Furthermore, the acceleration, displacement and failure index time histories at different locations were presented. The results showed that the greatest acceleration occurred in the athwart direction, followed by the vertical and longitudinal directions. Additionally, the first bubble pulse has a major effect on athwart acceleration. Moreover, the analysis can be effectively used to predict and calculate the failure indices of pressure hull. Additionally, it provides an efficient method that reasonably captures the dynamic response of a pressure hull subjected to UNDEX.

show abstract

“…Compared to the shock testing machine, a floating shock platform can realistically simulate the shock environment of an actual warship facing underwater noncontact explosions. For these reasons, floating shock platforms, which were used as standard test devices for evaluating the shock resistance of large-scale warship equipment, have been widely used in navies around the world [3,4].…”

Section: Introductionmentioning

confidence: 99%

A Correction Method for the Underwater Shock Signals of Floating Shock Platforms Based on a Combination of FFT and Low‐Frequency Oscillator

Wang

Yan

Zhang³

et al. 2019

Shock and Vibration

View full text Add to dashboard Cite

Accurate shock loading is required for evaluating and analyzing the shock resistance of warship equipment. However, measured shock acceleration signals contain trend term errors, which cause serious low-frequency distortion of the shock response spectrum (SRS). We propose a combination method of fast Fourier transform (FFT) and low-frequency oscillator for correcting the underwater shock signals. Based on the equal displacement line fitted by the measured displacement response data, the Fourier transform spectrum of the shock acceleration signal is corrected for eliminating low-frequency errors. The results of underwater explosion tests on a floating platform indicate that the average difference between the equal displacement line and SRS in the low-frequency band (4∼20 Hz) can be reduced from 14.7% to 3.5%, and the mid-high-frequency band without the trend term is nearly unaffected. The corrected SRS can faithfully reflect the actual shock environment of the warship equipment at a specific installation location of the floating shock platform.

show abstract

The Spherical Shock Factor Theory of a FSP with an Underwater Added Structure

Cited by 4 publications

References 16 publications

Research on the Shock Environment Characteristics of a Marine Diesel Engine Based on a Large Floating Shock Platform

Research on the Shock Environment Characteristics of a Marine Diesel Engine Based on a Large Floating Shock Platform

Numerical Analysis and Dynamic Response of Optimized Composite Cross Elliptical Pressure Hull Subject to Non-Contact Underwater Blast Loading

A Correction Method for the Underwater Shock Signals of Floating Shock Platforms Based on a Combination of FFT and Low‐Frequency Oscillator

Contact Info

Product

Resources

About