So sánh phương pháp

	Lý thuyết Động lượng Phần tử Cánh quạt	Rung động Theodorsen
Lĩnh vực	Hàng không vũ trụ	Hàng không vũ trụ
Họ	Process / pipeline	Process / pipeline
Năm ra đời	1889	1935
Người khởi xướng	William Froude, Heinrich Glauert	Theodore Theodorsen
Loại	Analysis method	Stability analysis
Công trình gốc	Froude, W. (1889). On the elementary relation between pitch, slip, and propulsive efficiency. Transactions of the Institution of Naval Architects, 30, 94–103.	Theodorsen, T. (1935). General theory of aerodynamic instability and the mechanism of flutter. NACA Report No. 496.
Tên gọi khác	BEM theory, rotor performance prediction, actuator disk method	flutter analysis, aeroelastic stability, Theodorsen's function
Liên quan	3	3
Tóm tắt	Blade element momentum theory (BEM) is a fundamental method for analyzing rotor performance by combining blade element aerodynamics with momentum conservation. Developed initially by Froude and refined by Glauert and Leishman, BEM decomposes a rotor into radial blade elements, computes local aerodynamic forces, and sums contributions to predict total thrust, torque, power, and efficiency. BEM is standard for helicopter, wind turbine, and propeller design.	Theodorsen flutter analysis is a classical aeroelastic method for predicting the onset of flutter, a self-excited oscillation where aerodynamic forces interact with elastic structural motion to cause rapid growth of oscillations. Developed by Theodore Theodorsen in 1935, the method uses frequency-domain analysis with Theodorsen's function to compute aerodynamic forces on oscillating wings. Flutter speed prediction is essential for aircraft certification and structural design.