Dynamic Behavior Analysis of Intermediate Bearing‐Squeeze Film Dampers‐Rotor System under Constant Maneuvering Overload

Zheng, Nan; Chen, Moli; Luo, Guihuo; Ye, Zhifeng

doi:10.1155/2021/5512409

Cited by 4 publications

(4 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to literature [7], the dynamical responses of a rotor system subjected to maneuvering flight influence can be worked out. For a single node in the finite element model, the vibrational displacements can be written as:…”

Section: Identification Methods Of Whirl Directionmentioning

confidence: 99%

The whirl direction and characteristics of rotor system under maneuvering flight

Chen,

Jiang,

Luo

et al. 2023

Vib. proced.

View full text Add to dashboard Cite

Maneuvering flight can generate the asymmetry of the stiffness or damping to an engine rotor system, as so to influent the whirl direction and characteristics of rotor system. In this article, the identification method for orbit direction is provided for a rotor system under maneuvering flight condition. By a simulation example, the variable movement shapes about rotor under maneuvering flight are illustrated through cases as the mixed and the pending whirls. The results show that the original low-order critical speed in the backward or forward whirl mode changes to the mixed whirl while considering the impact of maneuvering flight, where some backward and forward critical speeds in the same order are almost overlapped as one critical speed which in the mixed whirl mode. Maneuvering flight results in dynamic eccentricity of the rotor shaft, and the orbits of nodes in the mixed whirl are a series of ellipses with variable inclination angles. The case with pending whirl direction is finally determined as a mixed whirl by the orbit direction graph. The whirl directions of orbits on bearings or the contact angle of bearings maybe different under maneuvering flight can be explained from the rotor dynamical view.

show abstract

Section: Identification Methods Of Whirl Directionmentioning

confidence: 99%

The whirl direction and characteristics of rotor system under maneuvering flight

Chen,

Jiang,

Luo

et al. 2023

Vib. proced.

View full text Add to dashboard Cite

show abstract

“…It is necessary to consider the flight service environment spectrum when evaluating the life of components in aeroengines. For example, when calculating the load of the main bearing, real flight parameters under different service environments, as input variables, may save the establishment of strong coupling relationships on more than 13 flight parameters [1]. However, the issue of compiling a flight service environment spectrum related to the main bearing load has not yet been addressed.…”

Section: Introductionmentioning

confidence: 99%

Compilation Method of Flight Service Environment Spectrum Based on Altitude Features and Fuzzy Clustering

Chen,

Wei,

Wang

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

The flight service environment spectrum is essential to the evaluation of the life of components in aeroengines; however, real altitude, as an important flight parameter, introduces considerable challenges when compiling the service environment spectrum because of its non-stationary and non-ergodic characteristics. In this article, by solving trend terms from original data and removing redundancy from peak–valley values, an altitude feature extraction method is developed for the Frequency of Climb–Descent Flight (FCDF). Then, taking the 2D vector, composed of the maximum flight altitude and FCDF, as the input of fuzzy clustering, the service environment spectrum is compiled. Some examples are given to illustrate the presented methods. The results show that the FCDF does not increase with the maximum altitude; during high-altitude flight, the FCDF is the largest, while during mid- to low-altitude flight, the time proportion is the largest. On the other hand, mid-altitude or low-altitude flight not only has a small training frequency for climb–descent actions but also a low time proportion. The research results will provide a reference for the compilation of a service environment spectrum that considers maneuvering flight actions.

show abstract

“…When compiling the full-scale load spectrum related to the rotor or bearing vibration in military engines based on flight parameters, there are more than 13 flight parameters on maneuvering operations involved in dynamic simulation analysis [1,2]. Because of the serious coupling between so many flight parameters, it is feasible to make the actual flight parameters of the flight mission the input for dynamic simulations so as to retain the actual coupling relationships.…”

Section: Introductionmentioning

confidence: 99%

“…, in order to use the above algorithm o let is the number of S turns in the upper hAfter obtaining the number of S turns of the lower and the upp number of S turns in the first layer can be expressed by1 …”

mentioning

confidence: 99%

Statistical Algorithms with Phase-Sensitive Detection for the Number of Hovers and S Turns in Aircraft Flights

Chen,

Wei,

Wang

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

Compared to maximum state parameters, such as maximum altitude and Mach, the number of hovers and S turns can be used as process parameters representing the complexity of military aircraft maneuvers when classifying big flight mission data to compile flight load spectra for structures. This study developed intelligent statistical algorithms based on yaw angle data from flight parameters such as the number of hovers and S turns. Using the median-crossing de-redundant function of Phase-Sensitive Detection (PSD) and analyzing the characteristics of 360° hovering flight parameters, a statistical algorithm for the number of hovers during a flight profile is presented. Using the split-half function of PSD, a triangle layering algorithm based on the yaw angle signal was developed to count the number of S turns during a flight profile, where the signal of each sublayer is segmented into median-crossing intervals to eliminate the redundant median-crossing marks from the previous layer. Compared with artificial means, the statistical results of the flight example showed that the developed intelligent algorithms are effective.

show abstract

Dynamic Behavior Analysis of Intermediate Bearing‐Squeeze Film Dampers‐Rotor System under Constant Maneuvering Overload

Cited by 4 publications

References 15 publications

The whirl direction and characteristics of rotor system under maneuvering flight

The whirl direction and characteristics of rotor system under maneuvering flight

Compilation Method of Flight Service Environment Spectrum Based on Altitude Features and Fuzzy Clustering

Statistical Algorithms with Phase-Sensitive Detection for the Number of Hovers and S Turns in Aircraft Flights

Contact Info

Product

Resources

About