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Keywords = rudder stock mechanism

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14 pages, 7913 KB  
Article
Fatigue Life Analysis of the Submarine Rudder Stock Mechanism at Arctic Low Temperatures
by Siyu Chen, Wenyong Guo, Chenghao Cao, Jianing Huang, Jianxiang Zhang, Li Yu and Hantao Chen
Appl. Sci. 2023, 13(1), 127; https://doi.org/10.3390/app13010127 - 22 Dec 2022
Cited by 5 | Viewed by 3834
Abstract
Under the action of Arctic low temperatures and long-term alternating loads, the fatigue life of the submarine rudder stock mechanism is severely tested. In this paper, the research method of the static strength analysis and fatigue life analysis of the submarine rudder stock [...] Read more.
Under the action of Arctic low temperatures and long-term alternating loads, the fatigue life of the submarine rudder stock mechanism is severely tested. In this paper, the research method of the static strength analysis and fatigue life analysis of the submarine rudder stock mechanism is proposed by combining multibody dynamics, the finite element method, and tests. Based on the three-dimensional model and the motion law of the rudder stock mechanism, a multibody dynamic model is established, and the time history loads of each node of the mechanism are obtained. According to the working temperature range of the submarine rudder stock mechanism in the Arctic, low-temperature tensile tests are carried out. Based on the experimental data, the finite element model is built, and static analysis is carried out. Using the S–N static fatigue design method, fatigue simulation analysis is performed by using nCode DesignLife. The analysis results show that the fatigue life of the submarine rudder stock mechanism decreases significantly when the temperature is reduced from 0 °C to −60 °C. This method can provide a reference for submarine design and life model establishment in the Arctic environment. Full article
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10 pages, 6683 KB  
Letter
Detection of Pin Failure in Carbon Fiber Composites Using the Electro-Mechanical Impedance Method
by Jochen Moll, Matthias Schmidt, Johannes Käsgen, Jörg Mehldau, Marcel Bücker and Felix Haupt
Sensors 2020, 20(13), 3732; https://doi.org/10.3390/s20133732 - 3 Jul 2020
Cited by 4 | Viewed by 3645
Abstract
This paper presents a proof of concept for simultaneous load and structural health monitoring of a hybrid carbon fiber rudder stock sample consisting of carbon fiber composite and metallic parts in order to demonstrate smart sensors in the context of maritime systems. Therefore, [...] Read more.
This paper presents a proof of concept for simultaneous load and structural health monitoring of a hybrid carbon fiber rudder stock sample consisting of carbon fiber composite and metallic parts in order to demonstrate smart sensors in the context of maritime systems. Therefore, a strain gauge is used to assess bending loads during quasi-static laboratory testing. In addition, six piezoelectric transducers are placed around the circumference of the tubular structure for damage detection based on the electro-mechanical impedance (EMI) method. A damage indicator has been defined that exploits the real and imaginary parts of the admittance for the detection of pin failure in the rudder stock. In particular, higher frequencies in the EMI spectrum contain valuable information about damage. Finally, the information about damage and load are merged in a cluster analysis enabling damage detection under load. Full article
(This article belongs to the Special Issue Smart Sensors for Damage Detection)
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