Article
Materials Science, Multidisciplinary
Jia Shen, Wei Sun, Kunpeng Xu, Hui Zhang
Summary: This paper establishes a finite element model of the mistuned blisk with intentional mistuning of piezoelectric shunt damping patches (PSDPs) and analyzes the impact of mistuning on vibration reduction.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Mechanical
Alex Nakos, Bernd Beirow, Arthur Zobel
Summary: This study analyzes the radial turbine impeller of an exhaust turbocharger in terms of free vibration and forced response. It examines the effects of both random blade mistuning and intentional mistuning on vibration and stress levels. The importance of aerodynamic damping and the need for detailed knowledge on damping ratios are highlighted. Experimental investigations and finite element analyses are conducted to determine suitable mistuning patterns and their impact on blade natural frequencies. The study also focuses on the design of intentional mistuning patterns.
JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME
(2022)
Article
Chemistry, Multidisciplinary
Jose Joaquin Sanchez-Alvarez, Carlos Martel
Summary: The intentional mistuning is a common method to reduce the effects of random mistuning on blade vibration by introducing a small intentional mistuning pattern. By analyzing the problem using mathematical models and FEM simulations, it is found that intentional mistuning can effectively reduce the coupling effects of blade vibrations.
APPLIED SCIENCES-BASEL
(2021)
Article
Acoustics
Bin Bai, Qi Yang, Guang Wei Zhu, Qi Liang Wu, Xin Ye Li
Summary: An improved nonproportional mistuning method, ICMS-NPMM, is proposed to study mistuned turbine blisks, aiming to enhance calculation efficiency and reduce flutter. By dividing MTBs into mistuned blade and tuned disk structures, intentional mistuning is considered, leading to decreased sensitivity and flutter as well as smoother amplitude fluctuations of MSAs. The investigation provides important guidance for studying vibration characteristics of complex mechanical structures in engineering practice.
SHOCK AND VIBRATION
(2021)
Article
Engineering, Electrical & Electronic
Salvador Rodriguez-Blanco, Carlos Martel
Summary: The effect of intentional mistuning on the forced response behavior of an aerodynamically unstable low-pressure turbine rotor was studied using wind tunnel experiments. Adding a small extra mass to some of the blades created intentional mistuning patterns. However, during post-processing of the measurements, an anomalous behavior was observed with different resonance peaks and vibration amplitudes. A simplified model considering the coupling of traveling wave modes due to mistuning successfully explained the unexpected behavior.
Article
Engineering, Multidisciplinary
Dongxu Du, Wei Sun, Xianfei Yan, Xiaofeng Liu, Hongwei Ma, Hui Li
Summary: This study develops discontinuous arc connections with different connecting stiffness to simulate actual mistuning connections. The dynamic model of rotational mistuning-connecting disk-drum coupling structures is derived and verified. The mistuning connections induce changes in mode order, frequency division, and vibration localization. Mistuning also affects the key information in Campbell diagrams.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Engineering, Mechanical
Junhan An, Guoping Chen, Xi Deng, Chen Xi, Tao Wang, Huan He
Summary: This paper examines the dynamic phenomenon of a pneumatic QZS isolator with mistuned mass and analyzes the amplitude-frequency relationship and force transmissibility. The results show that, in the case of a large mass mistuning, the system exhibits possible response periods and chaos phenomena. Mass detuning leads to a more complex nonlinear response of the QZS isolator, and the dynamic response becomes more sensitive to changes in parameters such as external excitation frequency, amplitude, and damping ratio. These findings are helpful for improving the structure of the pneumatic QZS vibration isolator and determining the applicable working frequency.
NONLINEAR DYNAMICS
(2022)
Article
Engineering, Mechanical
Kunpeng Xu, Xianfei Yan, Dalu Xu, Dongxu Du, Wei Sun
Summary: This study presents a novel method to detect the parameters of blade substrate cracks in hard-coated blisks, utilizing mistuning identification technique and finite element simulation to establish basic data sets. The method proves to effectively detect crack parameters for all blades with high efficiency, showing higher accuracy in crack location detection than crack size detection. The proposed method exhibits good and stable identification accuracy for cracks within a specific size and location range.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Aerospace
Kunpeng Xu, Xianfei Yan, Dongxu Du, Wei Sun
Summary: A novel control method using hard coating is proposed to control the mistuning level of blisks, where the thickness of the hard coating is designed according to the mistuning state of blisk substrate. The method effectively reduces vibration localization and controls mistuning levels in the designed coated blisks.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Aerospace
Xianfei Yan, Dongxu Du, Honghao Liu, Kunpeng Xu, Wei Sun
Summary: A graded modeling method is proposed in this paper to model complex blisks with coating-geometric mistuning, blade-substrate multi-mistuning, and coating-material nonlinearity. Numerical analyses demonstrate that the developed method has higher computational efficiency and accuracy compared to other reduced-order models.
Article
Chemistry, Physical
Jiao Wang, Tianyu Guo, Wenyue Liu, Ziwei Wang, Yuehao Zhang
Summary: This study establishes a finite element model for the blade-hard coating composite structure, considering the hard coating material and substrate as isotropic materials using finite element methods. Harmonic response analysis is conducted to calculate the resonance amplitude of the composite under base excitation. The results show that the difference in natural frequency and modal loss factor of blades increases with higher storage modulus and thickness of the hard coating.
Article
Engineering, Civil
Renduo Song, Minghui Yao, Yan Niu, Qiliang Wu
Summary: This paper investigates the influence of aerodynamic prestress on the vibration characteristics of mistuned blisk through comparative study, considering one-way fluid-structure interaction. It is found that aerodynamic prestress changes the twisted angle of the blade, increases natural frequencies of the mistuned blisk, and affects the sensitivity of natural frequency to rotational velocity.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Engineering, Mechanical
Y. G. Wu, H. Wang, Y. Fan, L. Li
Summary: This paper presents a new semi-active piezoelectric damping strategy for the vibration suppression of integrally bladed disk (blisk). The main novelty is the networking of the synchronized switch damping (SSD). Numerical and experimental studies are conducted to illustrate and validate the effectiveness of the proposed strategy in dissipating and redistributing vibration energy.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Acoustics
Kunpeng Xu, Xianfei Yan, Dongxu Du, Wei Sun
Summary: Blade cracks in hard-coated blisks can lead to severe mistuning and vibration localization. A mistuning identification method based on a modified component mode mistuning reduced-order model is proposed to identify crack mistuning and analyze factors such as crack location, length, radial position, and modal data type influencing mistuning. The results show that crack length affects mistuning, with crack position and modal data type also impacting mistuning significantly.
JOURNAL OF LOW FREQUENCY NOISE VIBRATION AND ACTIVE CONTROL
(2021)
Article
Engineering, Mechanical
Sina Stapelfeldt, Christoph Brandstetter
Summary: This article systematically studies the influence of aerodynamic and structural mistuning on nonsynchronous vibrations (NSVs) and finds that both factors are effective in suppressing NSV. The results have important implications for design decisions.
JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME
(2022)
Article
Engineering, Aerospace
Andre F. P. Ribeiro, Carlos Ferreira, Damiano Casalino
Summary: This study compares a filament-based free wake panel method to experimental and validated numerical data in order to simulate propeller slipstreams and their interaction with aircraft components. The results show that the free wake panel method is able to successfully capture the slipstream deformation and shearing, making it a useful tool for propeller-wing interaction in preliminary aircraft design.
AEROSPACE SCIENCE AND TECHNOLOGY
(2024)
