scholarly journals Assessment of Substrate and TBC Damage Effects on Resonance Frequencies for Blade Health Monitoring

2022 ◽  
Vol 12 (1) ◽  
pp. 1-19
Author(s):  
Jason van Dyke ◽  
Michel Nganbe
Keyword(s):  
Natural Frequencies ◽  
Hot Spot ◽  
Turbine Blades ◽  
Three Dimensional ◽  
Early Assessment ◽  
Element Simulation ◽  
Resonance Frequencies ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Local Plastic Deformation

The reliability of critical aircraft components continues to shift towards onboard monitoring to optimize maintenance scheduling, economy efficiency and safety. Therefore, the present study investigates changes in dynamic behavior of turbine blades for the detection of defects, with focus on substrate cracks and TBC spallation as they relate to vibration modes 1 to 6. Two‐dimensional and three-dimensional finite element simulation is used. The results indicate that TBC spallation reduces natural frequencies due to the ensuing hot spot and overall increase in temperature, leading to drops in blade stiffness and strength. Cracks cause even larger frequency shifts due to local plastic deformation at the crack that changes the energy dissipation behavior. Mode 1 vibration shows the largest shifts in natural frequencies that best correlate to the size of defects and their position. As such, it may be most appropriate for the early assessment of the severity and location of defects.

Recheck Calculation of Dahedong Trench-Buried Inverted Siphon Structure

2014 ◽  
Vol 488-489 ◽  
pp. 589-592
Author(s):  
Min Tan
Keyword(s):  
Finite Element ◽  
Simulation Analysis ◽  
Process Analysis ◽  
Three Dimensional ◽  
Inverted Siphon ◽  
Operating Process ◽  
Element Simulation ◽  
Dimensional Finite Element ◽  
Water Conveyance ◽  
Three Dimensional Finite Element

Inverted siphon structure is a common water conveyance buildings, computer as a efficient computational tool is used, this paper adopt finite element method to carry out three-dimensional finite element simulation analysis for Dahedong inverted siphon structure. Deducing variation law of the inverted siphons stress and displacement in construction process and operating process. Analysis results further verified that design scheme is reasonable and safe, it has certain application value.

Study on Structure Simulation Analysis of Concrete Single Curvature Arch Dam

2011 ◽  
Vol 101-102 ◽  
pp. 560-563
Author(s):  
Wei Xie
Keyword(s):  
Finite Element ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Arch Dam ◽  
Hydropower Station ◽  
Structure Form ◽  
Element Simulation ◽  
Structure Simulation ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Arch dam is a water retaining structure which has beautiful bodily form and reasonable structure form. In recent years, arch dam has been widely used. This paper adopts finite element method to carry out three-dimensional finite element simulation analysis for Xiuwen hydropower station, research variation law of the dam’s stress and displace in operational process. Research results show that, single curvature arch dam of Xiuwen hydropower station have reasonable structure, good mechanical properties, every index meets the requirements for design.

Three Dimensional Finite Element Analysis of Reinforced Concrete Rectangular-Sectioned Aqueduct

2013 ◽  
Vol 644 ◽  
pp. 358-361
Author(s):  
Dong Yu Ji
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Element Analysis ◽  
Finite Element Software ◽  
Operating Process ◽  
Element Simulation ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

This paper adopts general finite element software to carry out three-dimensional finite element simulation analysis for Huizeli reinforced concrete rectangular-sectioned aqueduct. Considering four combination cases in aqueduct’s construction and operating process, researching variation laws of the aqueduct’s stress and displacement. Analysis results show that design scheme of Huizeli reinforced concrete rectangular-sectioned aqueduct is reasonable, it can meet design requirements. Analysis results provide some theory references for design of reinforced concrete rectangular-sectioned aqueduct.

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