Aircraft Engine Rear Suspension With Damping Ring For Vibration Control
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Solution Overview
Problem
Existing aircraft engine suspensions face issues with vibration due to clearance between hinge pins and their housings, leading to potential damage and reduced reliability.
Innovation Solution
A suspension system with a yoke joint and three-point shackles, incorporating ball joints and a damping cylindrical ring to manage clearance and prevent vibration transmission, ensuring reliable force transfer and compensation for potential failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hinge pins are installed with clearance to allow for misalignment and thermal expansion, then adaptability is improved, but vibration and reliability deteriorate
Solution Approach 1:
A damping element is introduced as an intermediary component between the hinge pin and the shackle housing. This damping element absorbs vibrations and prevents direct contact between the hinge pin and housing walls, thereby eliminating the harmful vibration effect while preserving the necessary clearance for adaptability.
Solution Approach 2:
The clearance that originally causes harmful vibrations is converted into a beneficial feature by introducing a damping element. The damping element utilizes the clearance space to absorb vibrations and protect the hinge pin, transforming the harmful vibration-generating clearance into a vibration-absorbing feature.
2Object-affected harmful factors
If hinge pins are tightly fitted to eliminate clearance, then vibration is reduced, but adaptability and ease of assembly deteriorate
Solution Approach 1:
The damping element serves as a mediator that allows the hinge pin to maintain clearance with the housing while preventing harmful vibrations. This intermediary component enables both vibration reduction and adaptability to coexist.
Solution Approach 2:
The connection system is segmented into three functional parts: the hinge pin, the damping element, and the housing. This segmentation allows each component to perform its specific function - the hinge pin provides rotational movement, the damping element absorbs vibrations, and the housing provides structural support.
3Reliability
If multiple hinge pins are installed in waiting for redundancy, then reliability is improved, but device complexity increases
Solution Approach 1:
Hinge pins are pre-installed in waiting positions within the shackle housing, ready to engage if a primary hinge pin fails. This beforehand preparation ensures reliability without requiring complex active engagement mechanisms, as the backup pins are already in position to automatically take over the load.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively dampens vibrations, enhances reliability by compensating for failures, and optimizes weight distribution, reducing wear and maintaining a stable configuration under operational forces.
Implementation Method 1
The strips (46) are made of an elastic material and are bent inwards towards the inside of the ring
Implementation Method 2
The ring (40) comprises longitudinal cut-outs in the form of strips (46)... such that the strips (46) prevent any vibration of the hinge pin (30b)
Data Source
AI summary
A rear suspension (10) for an aircraft engine assembly comprises a structure comprising two three-point shackles (12, 12′) and one two-point shackle (14). One of the hinge pins in waiting on the two-point shackle (14), preferably the hinge pin (26) fixed to the engine yoke joint, is mounted with clearance and with a damping ring acting as a spring to prevent vibrations of the engines as long as the hinge pin (26) is not engaged. Each of the suspension connecting pins (10) is a ball joint connection, the beam (16) of the suspension (10) being provided with five aligned orifices (24, 24a, 28, 24′, 24a′).