Determining the Damage Mechanisms for Buoyancy Materials of Deep-Sea Manned Submersibles

Zhang, Yi; Ding, Zhongjun; Wang, Yifan; Zhao, Qingxin; Shengjie, Qin

doi:10.2112/jcoastres-d-19-00007.1

Cited by 11 publications

(7 citation statements)

References 15 publications

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“…Due to technical constraints such as the installation process and structural design of buoyancy materials, damage to HOV buoyancy materials is a common problem, especially during long-term underwater operations or surface floating processes. Taking Jiaolong as an example, more than 30 instances of buoyancy material damage were reported during one application mission, and even essential parts such as the tail and bow were also damaged [2]. Therefore, monitoring the damage to buoyancy materials on HOVs is significant for their safe operation.…”

Section: Introductionmentioning

confidence: 99%

Research on detection and localization of buoyancy material damage in manned submarine vehicles based on PVDF spherical transducers and wavelet threshold denoising

Yin,

Liu,

2024

Third International Conference on Testing Technology and Automation Engineering (TTAE 2023)

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A method for locating the damage in buoyancy materials of manned submersibles based on polyvinylidene fluoride (PVDF) spherical transducer is proposed to address the problem of difficulty in real-time monitoring and positioning the damaged buoyancy materials during manned submersible operations. A PVDF spherical transducer array based on the optimal quaternion matrix principle was designed to determine the precise location of the damaged buoyancy material in the damaged area. The sound source localization model was established using the time-delay difference method to obtain the exact coordinates of the fracture site of the buoyancy material. To extract effective sound signals from the fracturing of buoyancy materials, a wavelet threshold-based signal denoising method was designed. Based on the localization principle, a software and hardware system for buoyancy material damage location was intended, and the feasibility of the process was verified by constructing an experimental platform. The experimental results show that under a laboratory simulated deep-sea noise environment, the wavelet threshold-based sound signal denoising method can effectively extract the target signal of buoyancy material fracture, and the spherical transducer with the denoised sound signal can accurately locate the damage position.

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Section: Introductionmentioning

confidence: 99%

Research on detection and localization of buoyancy material damage in manned submarine vehicles based on PVDF spherical transducers and wavelet threshold denoising

Yin,

Liu,

2024

Third International Conference on Testing Technology and Automation Engineering (TTAE 2023)

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“…Solid buoyancy material is an important component of submersibles. It was found that due to the insufficient mechanical properties of the buoyancy block material of the Jiaolong manned deep‐sea submersible, various cracks, and damages occurred during deep‐sea work, which brought major safety risks to the deep‐sea submersible and divers 4 . Material failure causes the submersible to no longer float smoothly and puts the lives of the personnel at risk.…”

Section: Introductionmentioning

confidence: 99%

Properties of epoxy resin matrix composites improved by silica sol‐activated hollow ceramic microspheres

Li,

Zhou,

Liu

et al. 2024

Polymer Composites

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Silica sol can activate the surface of hollow ceramic microspheres and improve the properties of composite materials by improving the interface between the microspheres and the epoxy resin. The group changes on the surface of microspheres were measured using infrared spectroscopy. The microspheres were observed with a scanning electron microscope. The density, water absorption, and mechanical properties of the materials were tested using scales and mechanical testing machines. The results showed that SiO2 and silane molecules were introduced on the surface of the microspheres after treatments. As the silica sol content increased, the slurry viscosity increased by 34.5%, the composite density increased by 5.8%, and the water absorption decreased by 35.8%. When the silica sol content was 25%, the flexural strength and compressive strength of the composites were 73.49 and 116.27 MPa, respectively, which were 37.8% and 23.6% higher than those of the untreated composites, and the mechanical properties became clearly improved. High mechanical properties enable the materials to be used in deeper ocean areas.Highlights Nanoparticles are introduced onto the surface of hollow microspheres. The activated microspheres can bind better to the silane coupling agent. Silane coupling agent assisted by silica sol improved interfacial bonding. Surface activation of microspheres improves the properties of composites.

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“…Several studies investigate the behavior of these composites under mechanical loading [9][10][11][12][13]. Considering especially hydrostatic pressure [14][15][16][17], by applying pressure to a syntactic foam, a decrease in the volume directly related to the bulk compressibility of the material can be observed: the lower the compressibility of the composite, the greater the variation of the volume. For higher pressures, a collapse in the glass microspheres lead to large volume variations [18].…”

Section: Introductionmentioning

confidence: 99%

Water absorption in hollow glass microsphere composites under hydrostatic pressure: Mechanisms and influencing parameters

et al. 2023

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Hollow glass microsphere composites, or syntactic foams, are widely used in marine environments due to their buoyancy. However, in service, loss of buoyancy occurs along time. This behavior is attributed to water absorption that leads to a mass increase of the material. This study investigates the water absorption of three types of syntactic foams under hydrostatic pressure with density ranging from 0.59 to 0.74 g. cm−3. Water absorption measurements are performed for a maximal duration of 3 years and under hydrostatic pressure up to 700 bars. Results show that water absorption is much higher than expected and attributed to the filling of microspheres that collapse over time. Based on results presented here, prediction of water absorption syntactic foams is proposed including the impact of applied hydrostatic pressure. This prediction allows estimating the buoyancy loss in hollow glass microsphere composite as a function of time, depth and sample size.

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Determining the Damage Mechanisms for Buoyancy Materials of Deep-Sea Manned Submersibles

Cited by 11 publications

References 15 publications

Research on detection and localization of buoyancy material damage in manned submarine vehicles based on PVDF spherical transducers and wavelet threshold denoising

Research on detection and localization of buoyancy material damage in manned submarine vehicles based on PVDF spherical transducers and wavelet threshold denoising

Properties of epoxy resin matrix composites improved by silica sol‐activated hollow ceramic microspheres

Water absorption in hollow glass microsphere composites under hydrostatic pressure: Mechanisms and influencing parameters

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