Mission segment division of the whole aeroengine loading spectrum based on flight actions

Jin, Yu; Sun, Zhigang; Song, Yingdong; Lin, Xin; Niu, Xuming; Ding, Jianfeng

doi:10.1016/j.cja.2021.06.015

Cited by 5 publications

(5 citation statements)

References 3 publications

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“…In China, many scholars have carried out thorough research on feature extraction and clustering methods for use in the aircraft service environment [11][12][13][14][15]. References [13][14][15] used the maximum altitude of a flight profile as a parameter when compiling the environmental spectrum, where only the limit value of altitude worked and the process characteristics were ignored.…”

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

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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.

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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

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“…In addition to the forward and backward whirl, rotors that are more sensitive to asymmetric stiffness will also occur a mixed whirl, with which some shaft segments of the rotor whirl in the same direction as the spin speed while the other shaft segments are opposite to the spin speed, and the whirl direction of different shaft segments in the rotor itself is different [4]. For example, in the case of a small-radius, large-slope, and sideslip hovering of aircraft, an engine rotor will be subjected to different levels of overload in the normal, lateral, and longitudinal directions, and the track, pitch, and roll directions of the rotor will be affected by different angular velocities, thus, causing the asymmetric stiffness and damping in the bending direction of the rotor [5,6].…”

Section: Introductionmentioning

confidence: 99%

The whirl direction and characteristics of rotor system under maneuvering flight

Chen,

Jiang,

Luo

et al. 2023

Vib. proced.

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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.

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“…Both audio-visual and internet-based learning media such as YouTube, Instagram, WhatsApp, and Facebook. It has become the era for students in the current era, students and students are more inclined to use social media and their cellphones (JIN et al, 2022) . Which is still relevant to the development of the independent curriculum (Muhammadiyah et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Responding to Muhammadiyah Educators in the Age of Neurotechnology: Implications for the Developing of Islamic Education

Jailani

2023

PAI

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There is a holistic differentiation of educational alliances which has received a warm response from multicultural Islamic education. The emergence of a homogeneous educational base with all its knick-knacks, giving rise to new cases or chapters in Islamic education. Haedar Nashir responded well to this in his scientific speech, as delivered on the 48th Mukhtamar Muhammadiyah day at UMS Surakarta, the content of his scientific speech was none other than the advancement of Muhammadiyah Islamic education in the Millennial era. This research responds to the polemic of Islamic education in Indonesia along with alternative approaches based on Islam in the current era. Estuary based on qualitative descriptive research about the rumors of Islamic education in Indonesia. This research is based on a qualitative approach to literature review. Data analysis was used with a content analysis approach. Notes The results of the study found that polemics about life and about learning, approaches, methods, information delivery, education management, and social media appear, in the present. The level of demands from the Ministry of Education and Culture and the Ministry of Religion that Islamic education is expected to be able to bring more enlightenment. But what is the power of Islamic education in Indonesia, it is still as usual, progressing not advancing and not retreating. Differentiation of educational alliances occurs everywhere, regardless of formal education or Islamic boarding school education. Researchers offer alternatives in the increasingly significant decline in education with several alternative approaches such as neuroscience-based learning, religious moderation-based learning, and knowledge management in Islamic education. The contribution and implications of this research lead to the improvement of Islamic education and learning based on Islamic studies, which in the current era are starting to be shunned by millennials and generation Z in the era of society 5.0. This research is a forum and foundation for the improvement and progress of Islamic civilization in the future.

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Mission segment division of the whole aeroengine loading spectrum based on flight actions

Cited by 5 publications

References 3 publications

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

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

The whirl direction and characteristics of rotor system under maneuvering flight

Responding to Muhammadiyah Educators in the Age of Neurotechnology: Implications for the Developing of Islamic Education

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