Partition Wall Membrane Clamping for Hydraulic Damping
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Solution Overview
Problem
Existing hydraulic bearing partition walls struggle to achieve precise decoupling of small-amplitude vibrations, leading to unsatisfactory damping values, especially at amplitudes below ±0.2 mm, due to manufacturing tolerances and limited membrane movement.
Innovation Solution
The membrane is clamped in predetermined areas and allowed to move with play in the remaining areas, with ring-shaped depressions on the nozzle disks and optional profiling or slotting to enhance damping and prevent cavitation, allowing for adjustable movement and improved liquid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the membrane is allowed to move freely with large amplitude (±0.2 mm), then damping effectiveness is improved, but manufacturing precision deteriorates and isolation of small-amplitude vibrations is compromised
Solution Approach 1:
The membrane is divided into clamped areas (fixed position) and non-clamped partial areas (free movement). This segmentation allows different regions of the membrane to serve different functions: the clamped areas maintain precise positioning for manufacturing tolerance, while the non-clamped partial areas provide the necessary movement range for damping effectiveness.
Solution Approach 2:
Different regions of the membrane are given different degrees of freedom. The clamped areas have restricted movement for precision, while the non-clamped partial areas have free movement for damping. This local differentiation resolves the contradiction between overall precision and local flexibility.
2Manufacturing precision
If the membrane is clamped tightly to ensure precision, then manufacturing precision is improved, but the freedom of movement is reduced and damping performance deteriorates
Solution Approach 1:
The membrane support structure is segmented into clamped regions and non-clamped regions. The clamped regions provide precise positional control, while the non-clamped partial areas allow the membrane to move freely for damping purposes.
Solution Approach 2:
The membrane transitions from a static fully-clamped state to a dynamic state where portions can move freely. This dynamic configuration allows the membrane to adapt its movement based on vibration conditions while maintaining precision where needed.
3Ease of manufacture
If larger manufacturing tolerances are permitted for the membrane, then ease of manufacture is improved, but damping performance collapses at amplitudes from this range
Solution Approach 1:
By segmenting the membrane into clamped and non-clamped areas, the design accommodates larger manufacturing tolerances in the non-clamped regions without compromising overall performance. The clamped areas maintain precision where critical, while tolerances can be relaxed in non-critical areas.
4Reliability
If the membrane is completely free-moving to maximize damping, then damping effectiveness is improved, but isolation of small-amplitude vibrations below ±0.2 mm deteriorates
Solution Approach 1:
The membrane structure implements local quality differentiation where clamped areas provide precise isolation for small-amplitude vibrations, while non-clamped partial areas provide free movement for damping larger amplitudes. This local differentiation resolves the contradiction between precision and damping effectiveness.
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
This configuration achieves optimal isolation and damping of small-amplitude vibrations, maintaining constant dynamic rigidity up to 50 Hz, while preventing rattling noises and ensuring effective damping across a wider range of amplitudes.
Implementation Method 1
a suspension spring made of an elastomer between a supporting bearing and a support
Implementation Method 2
The motor and the gearbox supported by the bearing are cushioned by the suspension spring when vibrations occur. The hydraulic fluid in the chambers and in the damping channel serves to dampen vibrations with large amplitude and low frequency.
Implementation Method 3
The arrangement of the membrane between the nozzle discs in the partition wall isolates the damping channel from high-frequency vibrations with small amplitudes.
Data Source
Figure 1
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AI summary
Partition wall (7) for a hydraulic bearing (1) with a support spring (2) made of an elastomer between a support bearing (3) and a bearing (4) of a working chamber (5) and a compensation chamber (6), which are separated from each other by the partition wall (7) made of two rigid nozzle disks (9, 10) with a flexible elastic membrane (11) inserted between them, wherein the chambers (5, 6) are hydraulically connected to each other via a damping channel (13), characterized in that the membrane (11) is clamped in predetermined areas (14, 15, 16) and is arranged with play in the remaining intermediate partial areas (19).