In the study of noise from propellers and ducted fans, rigorous signal decomposition into harmonic and broadband components is essential for the development of high-fidelity predictive models. Current spectral methods and phase averaging techniques lack the temporal resolution to compensate for fluctuations in operating condition intrinsic to real world experiments. In this paper we use a Vold-...

We examine the effect of baseline nozzle shape on the ability of fan flow deflectors to reduce downward-emitted turbulent mixing noise of coaxial jets simulating the exhaust condition of a turbofan engine. Several deflector concepts were tested on a nozzle with parallel exit flow lines and a nozzle with convergent flow lines. In every comparison the nozzle with convergent flow lines produced su...

Abstract Turbofan engine is a key component in aerospace. Its health condition determines whether an aircraft can operate reliably. However, it difficult to predict the remaining useful life (RUL) precisely because of characteristics complex operating conditions and various failure modes. To RUL more accurately make full use advantages neural networks, prediction model based on long short-term ...

Different approaches for the estimation of the states of linear dynamic systems are commonly used, the most common being the Kalman filter. For nonlinear systems, variants of the Kalman filter are used. Some of these variants include the LKF (linearized Kalman filter), the EKF (extended Kalman filter), and the UKF (unscented Kalman filter). With the LKF and EKF, performance varies depending on ...

The ability to monitor the structural health of the rotating components, especially in the hot sections of turbine engines, is of major interest to the aero community in improving engine safety and reliability. The use of instrumentation for these applications remains very challenging. It requires sensors and techniques that are highly accurate, are able to operate in a high temperature environ...

We present a computational study, validated by mean-flow experiments, of a dual-stream nozzle simulating the exit conditions of a supersonic turbofan engine with noise-suppressing fan flow deflectors. The study is conducted for eight nozzle configurations and two operating conditions: a cold condition at which mean velocity surveys were conducted and against which the computational code was val...

The turbofan engine is a pivotal component of the aircraft. Engine components are susceptible to degradation over life their operation, which affects reliability and performance an engine. In order direct necessary maintenance behavior, remaining useful prediction key. This research uses machine learning provide framework for aircraft’s (RUL) based on entire cycle data deterioration parameter (...

In a turbofan engine, thrust is key parameter which measured or estimated from various parameters acquired during engine testing in an testbed. Exhaust Gas Temperature (EGT) the most critical used for calculation. This work presents novel way to measure and correct errors EGT measurement. A temperature probe designed jet pipe using thermocouples. The withstand mechanical loads operation. Struct...

Laser-based missile-defence systems are being increasingly employed on aircraft to provide protection when attacked by optically-guided weapons. In some engagements the laser beam must pass through the exhaust gases of the aircraft. To predict the increase in laser beam divergence and jitter of the laser beam direction, an understanding of the exhaust gas structure and its influence is required...