Active Damper Upper Mount Vibration Damping
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Solution Overview
Problem
Conventional upper mounts for active dampers become excessively hard when a large control force is applied, leading to ineffective damping and absorption of vibrations transmitted from tires or drive units, regardless of frequency.
Innovation Solution
An active damper upper mount design featuring an inner member, an intermediate member, and an outer member, with first and second elastic bodies disposed between them to allow elastic displacement, ensuring effective damping and absorption of vibrations across various frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single elastic body is used in the upper mount, then the structure is simple, but the vibration damping performance deteriorates when large control forces are applied
Solution Approach 1:
The single elastic body is divided into two separate elastic bodies (first and second elastic bodies) with different characteristics. The first elastic body handles high-frequency vibrations while the second handles low-frequency vibrations, allowing each to be optimized for its specific frequency range rather than requiring one elastic body to handle all frequencies equally.
Solution Approach 2:
Different regions of the upper mount are assigned different elastic characteristics through the use of two distinct elastic bodies. The first elastic body has properties optimized for high-frequency damping while the second has properties optimized for low-frequency damping, creating local quality variations that improve overall vibration damping performance across the full frequency spectrum.
2Force
If a large control force is applied to the rod, then the active damper can effectively control vibrations, but the elastic body becomes excessively hard and loses damping capability
Solution Approach 1:
The damping function is segmented between two elastic bodies with different stiffness characteristics. When large control forces are applied, the system can maintain damping capability through the second elastic body which is designed to remain effective under high-load conditions, while the first elastic body handles the high-frequency components that remain.
Solution Approach 2:
The system uses elastic bodies with different physical parameters (stiffness, damping coefficients) to maintain effective damping across different operating conditions. The second elastic body is specifically designed with parameters that allow it to maintain damping capability even when large control forces are applied to the rod.
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 design effectively damps and absorbs vibrations transmitted to the vehicle body from active dampers, even under high control forces, by utilizing the distinct properties of the first and second elastic bodies to manage vibration transmission and maintain durability.
Implementation Method 1
a first elastic body that is disposed between the inner member and the intermediate member and supports the inner member and the intermediate member so as to be elastically displaceable relative to each other
Implementation Method 2
a second elastic body that is disposed between the intermediate member and the outer member and supports the intermediate member and the outer member so as to be elastically displaceable relative to each other
Data Source
AI summary
The active damper upper mount includes an inner member (11, 111) to which an upper end portion of a rod (22, 122) of an active damper (21, 121) is fixed, an intermediate member (12, 112) that surrounds the inner member in a circumferential direction around a rod axis (O1, O2), an outer member (13, 113) that surrounds the intermediate member in the circumferential direction and is attached to a vehicle body side, a first elastic body (14, 114) that is disposed between the inner member and the intermediate member and supports the inner member and the intermediate member so as to be elastically displaceable relative to each other, and a second elastic body (15, 115) that is disposed between the intermediate member and the outer member and supports the intermediate member and the outer member so as to be elastically displaceable relative to each other.