scholarly journals Analytical and Numerical Investigation of Lacing Wire Damage Induced Mistuning in Turbine Blade Packet

2014 ◽  
Vol 2014 ◽  
pp. 1-16 ◽  
Author(s):  
Mangesh S. Kotambkar ◽  
Animesh Chatterjee
Keyword(s):  
Turbine Blade ◽  
Turbine Blades ◽  
Real Life ◽  
Continuous System ◽  
Modal Parameters ◽  
Value Analysis ◽  
Linear Elastic ◽  
Finite Element Package ◽  
Real Life Situation ◽  
Grouped Blades

Investigations of modal parameters for a mistuned packet of turbine blades due to lacing wire damage are reported using analytical and numerical studies with a simplified model. The turbine blade is assumed to be an Euler-Bernoulli beam connected with a lacing wire which is modeled as a mass less linear elastic spring. Thus, the blade is considered as a continuous system and lacing wire as a discrete system. The analytical results using Eigen value analysis are compared with numerical results obtained using commercial finite element package. In real life situation, though not reported in the literature, it is the failure of lacing wire that occurs quite often compared to the turbine blade and acts as precursor to the subsequent blade damage if it goes undetected. Therefore, studying the modal parameters of the grouped turbine blades in the context of lacing wire failure becomes important. The effect of variation of lacing wire location and stiffness indicative of damage resulting in the loss of stiffness on modal parameters is investigated. The study reveals a lot of fundamental understandings pertaining to dynamic behavior of grouped blades compared to the stand-alone blade under the influence of damaged lacing wire.

scholarly journals EFEKTIVITAS MODEL ROLE PLAYING DALAM MENINGKATKAN KOMPETENSI MAHASISWA PADA MATA KULIAH MANAJEMEN KEUANGAN

2017 ◽  
Vol 5 (1) ◽  
Author(s):  
Tiara Anggia Dewi
Keyword(s):  
Financial Management ◽  
Real Life ◽  
Role Playing ◽  
Control Group ◽  
Life Situation ◽  
Control Group Design ◽  
Value Analysis ◽  
Group Design ◽  
Management Learning ◽  
Real Life Situation

One of the direct learning models involved students in the learning process is the Role Playing model. The learning model is very suitable for learning subjects that involves real life situation. In Model Role Playing students are invited to play some roles related to the subjects being studied. With the role played by each student, they can experience firsthand the lessons exposed to the subjects. For example on financial management subjects. This research is an experimental, with research design True Experimental Design, Pretest-control Group Design. In the data analysis can be seen that the calculation of the value analysis thitung> ttabel. On the list of significant 5% that is 7.74> 1.70 that t_hitung bigger than ttable and at a significant level of 1% that is 7.74> 2.46 that thitung bigger than ttabel. By affecting t_count with ttable if t_count> ttable means the hypothesis is accepted. From these tests it can be concluded that the effectiveness of Role Playing Model in Improving Student Competence on Financial Management Subject, the hypothesis is accepted. Keywords: Financial Management, Learning, Role Playing Model, 

scholarly journals EFEKTIVITAS MODEL ROLE PLAYING DALAM MENINGKATKAN KOMPETENSI PADA MAHASISWA DALAM MATA KULIAH MANAJEMEN KEUANGAN

2019 ◽  
Author(s):  
Lu’ Lu’ IL Maknuun
Keyword(s):  
Financial Management ◽  
Real Life ◽  
Role Playing ◽  
Control Group ◽  
Life Situation ◽  
Control Group Design ◽  
Value Analysis ◽  
Group Design ◽  
Management Learning ◽  
Real Life Situation

AbstractOne of the direct learning models involved students in the learning process is the Role Playing model. The learning model is very suitable for learning subjects that involves real life situation. In Model Role Playing students are invited to play some roles related to the subjects being studied. With the role played by each student, they can experience firsthand the lessons exposed to the subjects. For example on financial management subjects. This research is an experimental, with research design True Experimental Design, Pretest-control Group Design. In the data analysis can be seen that the calculation of the value analysis thitung> ttabel. On the list of significant 5% that is 7.74> 1.70 that t_hitung bigger than ttable and at a significant level of 1% that is 7.74> 2.46 that thitung bigger than ttabel. By affecting t_count with ttable if t_count> ttable means the hypothesis is accepted. From these tests it can be concluded that the effectiveness of Role Playing Model in Improving Student Competence on Financial Management Subject, the hypothesis is accepted.Keywords: Financial Management, Learning, Role Playing Model,

scholarly journals Finite Element Analysis of Tidal Turbine Blade Subjected to Impact Loads from Sea Animals

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7208
Author(s):  
Ilias Gavriilidis ◽  
Yuner Huang
Keyword(s):  
Finite Element ◽  
Stainless Steel ◽  
Turbine Blade ◽  
Turbine Blades ◽  
Real Life ◽  
Impact Loads ◽  
Element Analysis ◽  
Tidal Turbine ◽  
Tidal Stream ◽  
Tidal Stream Turbine

The present work investigates structural response of tidal stream turbine blades subjected to impact loads from sea animals. A full-scale tidal turbine blade model was developed using a finite element modelling software ABAQUS, while a simplified geometry of an adult killer whale (Orcinus orca) was assumed in simulating impact on the blade. The foil profiles along the turbine blade were based on the NACA 63-8XX series, while the geometric and material properties of the sea animal were calibrated with experimental results. The numerical model simulated the dynamic response of the blade, accounting for radial velocities of the blade corresponding to real life scenarios. Different magnitudes and trajectories of the velocity vector of the sea animal were simulated, in order to investigate their influence on the turbine blade’s plastic deformation. Furthermore, multiple impacts were analysed, in order to monitor the accumulation of plastic strain in the material of the blade. Finally, the potential application of stainless steel material in tidal stream turbine blades for impact resistance was evaluated, through comparison of numerical results obtained from models using stainless steel and mild carbon steel materials.

Closed Die Forging of Turbine Blades

2010 ◽  
Author(s):  
Somer M. Nacy ◽  
Alaa H. Ali
Keyword(s):  
Experimental Investigation ◽  
Finite Element ◽  
Turbine Blade ◽  
High Purity ◽  
Turbine Blades ◽  
Theoretical Part ◽  
Die Forging ◽  
Closed Die Forging ◽  
Finite Element Package ◽  
Line Angle

This paper comprises a theoretical and experimental investigation dealing with the simulation of closed die forging of turbine blades. The theoretical part was achieved numerically via the well known finite element package (ANSYS). For simulation purposes, the material used for blade manufacture was high purity lead (99.99%), which was pressed between two dies with the required shape of the turbine blade. An optimum flash-less die shape was obtained with a parting line angle of 16°.

scholarly journals Turbine Blade Three-Wavelength Radiation Temperature Measurement Method Based on Reflection Error Correction

2021 ◽  
Vol 11 (9) ◽  
pp. 3913
Author(s):  
Kaifeng Zheng ◽  
Jinguang Lü ◽  
Yingze Zhao ◽  
Jin Tao ◽  
Yuxin Qin ◽  
...  
Keyword(s):  
Temperature Measurement ◽  
Turbine Blade ◽  
Measurement Method ◽  
Turbine Blades ◽  
Target Surface ◽  
Maximum Error ◽  
Radiation Temperature ◽  
Average Error ◽  
Real Surface ◽  
Wavelength Radiation

The turbine blade is a key component in an aeroengine. Currently, measuring the turbine blade radiation temperature always requires obtaining the emissivity of the target surface in advance. However, changes in the emissivity and the reflected ambient radiation cause large errors in measurement results. In this paper, a three-wavelength radiation temperature measurement method was developed, without known emissivity, for reflection correction. Firstly, a three-dimensional dynamic reflection model of the turbine blade was established to describe the ambient radiation of the target blade based on the real surface of the engine turbine blade. Secondly, based on the reflection correction model, a three-wavelength radiation temperature measurement algorithm, independent of surface emissivity, was proposed to improve the measurement accuracy of the turbine blade radiation temperature in the engine. Finally, an experimental platform was built to verify the temperature measurement method. Compared with three conventional colorimetric methods, this method achieved an improved performance on blade temperature measurement, demonstrating a decline in the maximum error from 6.09% to 2.13% and in the average error from 2.82% to 1.20%. The proposed method would benefit the accuracy in the high-temperature measurement of turbine blades.

Treadmill Walking in Old Age May Not Reproduce the Real Life Situation

1993 ◽  
Vol 41 (1) ◽  
pp. 15-18 ◽  
Author(s):  
Carolyn Greig ◽  
Felicity Butler ◽  
Dawn Skelton ◽  
Siti Mahmud ◽  
Archie Young
Keyword(s):  
Old Age ◽  
Real Life ◽  
Treadmill Walking ◽  
Life Situation ◽  
The Real ◽  
Real Life Situation

scholarly journals Waterpipe effects on pulmonary function and cardiovascular indices: a comparison to cigarette smoking in real life situation

2014 ◽  
Vol 26 (10) ◽  
pp. 620-627 ◽  
Author(s):  
Nelly Layoun ◽  
Nadine Saleh ◽  
Bernadette Barbour ◽  
Sanaa Awada ◽  
Samar Rachidi ◽  
...  
Keyword(s):  
Cigarette Smoking ◽  
Pulmonary Function ◽  
Real Life ◽  
Life Situation ◽  
Real Life Situation

scholarly journals Thermal–Fluid–Solid Coupling Analysis on the Temperature and Thermal Stress Field of a Nickel-Base Superalloy Turbine Blade

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3315
Author(s):  
Liuxi Cai ◽  
Yao He ◽  
Shunsen Wang ◽  
Yun Li ◽  
Fang Li
Keyword(s):  
Thermal Stress ◽  
Temperature Gradient ◽  
Turbine Blade ◽  
Turbine Blades ◽  
Nickel Base Superalloy ◽  
Barrier Coating ◽  
Thermal Stress Field ◽  
Nickel Base ◽  
Stress Damage ◽  
Superalloy Turbine Blade

Based on the establishment of the original and improved models of the turbine blade, a thermal–fluid–solid coupling method and a finite element method were employed to analyze the internal and external flow, temperature, and thermal stress of the turbine blade. The uneven temperature field, the thermal stress distribution characteristics of the composite cooling turbine blade under the service conditions, and the effect of the thickness of the thermal barrier coating (TBC) on the temperature and thermal stress distributions were obtained. The results show that the method proposed in this paper can better predict the ablation and thermal stress damage of turbine blades. The thermal stress of the blade is closely related to the temperature gradient and local geometric structure of the blade. The inlet area of the pressure side-platform of the blade, the large curvature region of the pressure tip of the blade, and the rounding between the blade body and the platform on the back of the blade are easily damaged by thermal stress. Cooling structure optimization and thicker TBC thickness can effectively reduce the high temperature and temperature gradient on the surface and inside of the turbine blade, thereby reducing the local high thermal stress.

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