Vibration Reduction Characteristics and Vibration Control of Aviation Hydraulic Pipeline by Hard Coating

Abstract

Aviation hydraulic pipelines are an important channel for power transmission in aviation hydraulic systems. Due to long-term exposure to complex vibration environments, hydraulic pipeline systems are susceptible to accumulated fatigue damage failure, which poses a great threat to aircraft safety and reliability. At present, there are only passive ways to reduce hydraulic pipeline vibration, such as adding vibration isolators and damping bearings. These methods have a poor vibration damping effect and are not safe. In this study, a hard coating was used as a new vibration reduction method for aviation hydraulic pipelines to reduce the damage caused by vibrations. For this purpose, three different hard-coating materials were optimally selected, and model creation, finite element analysis, and experimental research were carried out to study the vibration responses of hard-coated aviation hydraulic pipelines under the actual working conditions of an aircraft. The optimal solution was obtained through orthogonal experiments. The vibration reduction rate of the aviation hydraulic pipelines could reach 20.33% under the constant-frequency excitation of the low-pressure rotor of the engine, and the vibration reduction rate under the constant-frequency excitation of the high-pressure rotor could reach 26.60%. The rationality of the model was verified, and it was proven that the hard coating could meet the demands of vibration control in practical engineering and provide a reference for the vibration analysis and vibration control design of aviation hydraulic piping systems.

Vibration Analysis and Damping Effect of Blade-Hard Coating Composite Structure Based on Base Excitation

“…Similarly, as the HC thickness increases, the natural frequency of the BHC shows an upward trend, consistent with the conclusion from [27]. Furthermore, the shift in the BHC's natural frequency aligns with the findings of [30].…”

“…The application of hard coatings in the existing literature mostly focuses on simplifying coated discs [5][6][7][8][9][10][11][12][13][14][15], straight blades [16][17][18][19][20][21], plates [22][23][24][25][26], thin shells [27][28][29][30], and disk drums [31]. Yan et al [5] proposed using virtual layers to simulate changes in coating thickness and analyzed the impact of coating thickness on the natural frequency and forced response of actual disks.…”

“…Zhang et al [29] studied the nonlinear vibration characteristics of HC cylindrical shells under base excitation, taking into account material damping, equivalent viscous damping, and strain dependence of a hard coating storage modulus and loss factor. Cui et al [30] applied hard coatings to aviation hydraulic pipelines to reduce damage caused by vibration. Du et al [31] applied hard coatings to disk drum coupling structures and found that some coating models had better vibration reduction effects than the entire layer model.…”

The Tribological Properties of Micro-textured AlCrN Coated Cemented Carbide

“…They found that the fish-scale texture significantly reduced the friction coefficient of the piston's surface. Liu [8] found that applying a 300 μm thick YSZ ceramic coating on an aviation hydraulic pipeline was able to effectively suppress the amplitude of the basic excitation vibration response of the pipeline under working conditions. Choudhury et al [9] studied the tribological properties associated with different thicknesses of a polydopamine /PTFE graphite particle coating on 60NiTi.…”