Eccentric Mass Vibration Damper for Diesel Injection Lines
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Solution Overview
Problem
Existing vibration dampers for injection lines in diesel engines are heavy, costly, and require significant installation space due to their need for thick walls and high weight to effectively dampen resonance frequencies, and they are difficult to tune for specific vibration frequencies.
Innovation Solution
The design of a vibration damper with an eccentric mass distribution that allows for torsional vibrations about the pipe axis, reducing the natural frequency by a factor of 5 and enabling a 25-fold reduction in weight, while maintaining damping effectiveness, and featuring a base body that can be easily assembled and securely engaged with the injection pipe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the vibration damper uses a rotationally symmetrical design, then the structure is simple and manufacturing is easier, but the natural frequency is too high and weight must be increased to achieve effective damping
Solution Approach 1:
The patent applies asymmetry by introducing an eccentric mass distribution within the hollow cylindrical body. The mass center is deliberately offset from the geometric center, creating an asymmetric mass distribution that enables torsional vibrations. This asymmetric design allows the damper to achieve lower natural frequency and effective vibration damping without increasing wall thickness or overall weight, resolving the contradiction between structural simplicity and weight requirements.
2Reliability
If the vibration damper increases wall thickness to reduce natural frequency, then damping effectiveness improves, but cost and installation space increase
Solution Approach 1:
The eccentric mass distribution creates torsional vibration modes that are more effective at damping injection line vibrations. This asymmetric mass arrangement allows the damper to achieve superior damping effectiveness with thinner walls, thereby reducing both material usage and installation space requirements while maintaining or improving vibration suppression performance.
Solution Approach 2:
The patent utilizes mechanical vibration principles by designing the eccentric mass to naturally resonate at lower frequencies. The torsional vibrations generated by the eccentric mass distribution during engine operation provide continuous passive damping, eliminating the need for thick walls and achieving effective vibration control with compact dimensions.
3Reliability
If the vibration damper is designed to dampen the widest frequency band, then damping effectiveness across all frequencies improves, but the damper becomes heavier with thicker walls
Solution Approach 1:
The eccentric mass distribution creates torsional vibration modes that naturally cover a broader frequency range. The asymmetric design introduces additional degrees of freedom in the vibration behavior, allowing the damper to effectively suppress multiple vibration frequencies simultaneously without requiring increased weight or wall thickness.
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 provides effective vibration damping with reduced weight and volume, allowing for easier tuning to disruptive frequencies and simplified assembly, while maintaining non-rotatable engagement with the injection pipe.
Implementation Method 1
The eccentric design means that the vibration damper can perform torsional vibrations about the tube axis, which do not occur with rotationally symmetrical vibration absorbers
Implementation Method 2
The injection lines can be excited more and more often with one of their natural natural frequencies to resonant vibrations
Implementation Method 3
The effect of the known vibration absorbers is based on the mass-spring system with damping
Implementation Method 4
the elastically deformed base body largely returns to its original shape, resulting in a non-rotatable engagement with the injection pipe
Data Source
Figure 1~6
Figure 7~12
Figure 13~18
AI summary
A mass-spring damper (1) operating according to the mass-spring principle, which is intended for mounting on an injection pipe, comprises a base body (2) made of an elastomeric, vibration-damping material and having a longitudinally continuous inner cavity (3) which surrounds the injection pipe in the mounted state, wherein the longitudinal axis (4) of the inner cavity (3) coincides with the longitudinal axis of the pipe, and is characterized in that it has an eccentric mass distribution with respect to its longitudinal axis (4) and can be mounted on the injection pipe in a rotationally fixed manner.