An Acoustic Design Procedure for Intake Systems: 1D Analysis and Experimental Validation

Author(s):  
F. Bozza ◽  
A. Gimelli ◽  
V. Pianese ◽  
S. De Martino ◽  
R. Curion
2017 ◽  
Vol 65 (9) ◽  
pp. 4595-4606 ◽  
Author(s):  
Michele Borgese ◽  
Filippo Costa ◽  
Simone Genovesi ◽  
Agostino Monorchio

Author(s):  
Shining Chan ◽  
Huoxing Liu ◽  
Fei Xing ◽  
Hang Song

This paper adapted and extended the preliminary two-step wave rotor design method with another step of experimental validation so that it became a self-validating wave rotor design method with three steps. First, the analytic design based on unsteady pressure wave models was elucidated and adapted to a design function. It was quick and convenient for a first prediction of the wave rotor. Second, the computational fluid dynamics (CFD) simulation was adapted so that it helped to adjust the first prediction. It provided detailed information of the wave rotor inner flow. Thirdly, an experimental method was proposed to complement the validation of the wave rotor design. This experimental method realized tracing the pressure waves and the flows in the wave rotor with measurement on pressure and temperature distributions. The critical point of the experiment is that the essential flow characteristics in the rotor were reflected by the measurements in the static ports. In all, the three steps compensated for each other in a global design procedure, and formed an applicable design method for generic cases.


2020 ◽  
Vol 142 (8) ◽  
Author(s):  
Ali Maddahi ◽  
Nariman Sepehri ◽  
Witold Kinsner

Abstract Design of fault-tolerant controllers (FTC) for hydraulic actuators is one of the challenges in the area of fluid power systems. In real applications, it is not possible to model or measure some faults accurately. For example, an accurate model for the actuator internal leakage has not been well-established. To prevent the actuator malfunctioning due to the faults (e.g., the internal leakage), there is a need for designing a fault-tolerant control system. In this paper, a methodology is proposed to design an FTC for the hydraulic actuators using experimental data only. In the proposed design procedure, there is no need for either having a prior knowledge about the system and fault models or measuring and detecting the fault during the experiments. The methodology is based on introducing synthetic errors into the hydraulic actuator that is otherwise operating in the healthy mode. Synthetic errors are used to emulate the effect of the fault on the system response. The wavelet transform (WT) is utilized to quantify the effect of the synthetic errors on the error between the desired and actual displacement data. Results of the wavelet analysis are then employed for designing a fractional-order proportional-integral-derivative (FOPID) controller tolerant to the fault. The proposed approach is exemplified with the design of a controller tolerant to the internal leakage. Several experiments are conducted to verify the efficacy of the FOPID-based FTC. The experimental results prove that the proposed methodology works well for the hydraulic actuation system experiencing the internal leakage.


2020 ◽  
Vol 168 ◽  
pp. 107419 ◽  
Author(s):  
Jie Zhang ◽  
Xinbiao Xiao ◽  
Xiaozhen Sheng ◽  
Dan Yao ◽  
Ruiqian Wang

2015 ◽  
Vol 53 (01) ◽  
Author(s):  
L Spomer ◽  
CGW Gertzen ◽  
D Häussinger ◽  
H Gohlke ◽  
V Keitel

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