Abstract
The design of aircraft hydraulic pipeline system is limited by many factors, such as the integrity of aviation structure or narrow installation space, so the limited clamp support position should be considered. This paper studied the frequency adjustment and dynamic responses reduction of the multi-support pipeline system through experiment and numerical simulation. To avoid the resonance of pipeline system, we proposed two different optimization programs, one was to avoid aero-engine working range, and another was to avoid aircraft hydraulic pump pulsation range. An optimization method was introduced in this paper to obtain the optimal clamp position. The experiments were introduced to validate the optimization results, and the theoretical optimization results can agree well with the test. With regard to avoiding the aero-engine vibration frequency, the test results revealed that the first natural frequency was far from the aero-engine vibration frequency. And the dynamic frequency sweep results showed that no resonance occurred on the pipeline in the engine vibration frequency range after optimization. Additionally, with regard to avoiding the pump vibration frequency, the test results revealed that natural frequencies have been adjusted and far from the pump vibration frequency. And the dynamic frequency sweep results showed that pipeline under optimal clamp position cannot lead to resonance. The sensitivity analysis results revealed the changing relationships between different clamp position and natural frequency. This study can provide helpful guidance on the analysis and design of practical aircraft pipeline.
Highlights
The function of hydraulic system is to maintain the running of aircraft
The mode results found that the first-order natural frequency of the optimized position reached 233 Hz, which exceeds 20% of the upper limit of the engine vibration frequency, and the mode optimization results meet the needs
The actual optimization effect was verified through relevant experiments, and the results showed that the optimization effect met the engineering requirements
Summary
The function of hydraulic system is to maintain the running of aircraft. During the aircraft operation, external excitation inevitably stimulates the vibration of the hydraulic pipeline system, which leads to pipeline fracturing and fatigue failure [1, 2]. Compared with the design of other vehicle pipelines, there are some matters that designers should mainly focus [17]: (1) the pipeline installation mainly depends on standards and experience; (2) narrow installation space; (3) withstanding multiple excitation sources; (4) weakening of elastic support. Liu et al [20] analyzed the dynamic sensitivity of the clamp position in an aero-engine pipeline and proposed an optimal design scheme for two sets of clamps with the objective of maximizing the fundamental frequency difference and minimizing the standard deviation of random vibration. This paper proposed an optimization method for the natural frequency adjustment and dynamic response reduction of the multi-support pipeline system. To verify the effect of the theoretical optimization effects, this paper proposes a test device for simulating the multi-support pipeline system and verifying the optimization scheme
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