Hydraulic Mount Actuator for High-Frequency Vibration Isolation
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Solution Overview
Problem
Existing hydraulic mounts struggle with effectively isolating high-frequency vibrations due to resonance issues, leading to noise transmission in motor vehicles, as their dynamic stiffness increases at specific frequency ranges, making it difficult to achieve adequate damping beyond these frequencies.
Innovation Solution
The design incorporates an electromagnetic linear actuator with a ferromagnetic armature and stator, featuring a guide element with collars and permanent magnets, which reduces the armature's mass and allows for controlled movement, increasing the resonant frequency of the hydraulic mount to above 50 Hz, thereby enhancing high-frequency vibration isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the bearing is made stiff to absorb high loads, then load-bearing capacity is improved, but vibration isolation capability deteriorates
Solution Approach 1:
The patent applies dynamics by making the bearing stiffness adjustable rather than fixed. The active control system dynamically modifies the bearing characteristics based on operating conditions, allowing the system to be stiff when high loads are present and compliant when vibration isolation is needed. This resolves the contradiction by enabling the bearing to adapt its properties in real-time rather than being optimized for a single condition.
Solution Approach 2:
The patent changes the parameter of bearing stiffness from a constant value to a variable parameter. Through active control mechanisms, the system can modify the dynamic stiffness of the bearing to match different operating requirements, thereby achieving both high load-bearing capacity and effective vibration isolation at different times as needed.
2Force
If the armature mass is increased to improve force output, then actuating capability is improved, but resonant frequency decreases
Solution Approach 1:
The patent replaces the traditional heavy armature design with a lighter alternative that uses electromagnetic or active control mechanisms to generate the required forces. This substitution allows the system to achieve sufficient actuating force without relying on large armature mass, thereby maintaining higher resonant frequencies and avoiding resonance issues in the operational range.
Solution Approach 2:
The patent counteracts the effect of armature mass by using active control forces to compensate for the reduced inertia. The control system generates forces that replace the momentum and inertial effects that would naturally come from a heavier armature, allowing the system to maintain both low mass (for high resonant frequency) and sufficient force output (through active control).
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 significantly reduces noise emissions by effectively isolating both structure-borne and airborne noise caused by engine vibrations, improving the hydraulic mount's ability to handle high-frequency vibrations and maintaining controllability across a broader frequency range.
Implementation Method 1
electromagnetic linear actuator with a ferromagnetic armature and stator
Implementation Method 2
guide element with collars and permanent magnets
Implementation Method 3
working chamber that is filled with a hydraulic fluid
Implementation Method 4
throttle channel formed between the working chamber and the compensating chamber for exchanging hydraulic fluid
Implementation Method 5
rubber element as a suspension spring
Data Source
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AI summary
The invention relates to an electromagnetic linear actuator (16) with a stator (18) and an armature (20) which can be moved relative to the stator (18). The stator (18) has at least one permanent magnet (22) and at least one coil (24), the stator (18) has a conductive element (26) made of a ferromagnetic material, the conductive element (26) extends over the at least one permanent magnet (22) and/or the at least one coil (26), and the armature (18) forms a yoke (34) made of a ferromagnetic material in the longitudinal direction L for the conductive element (26). The invention further relates to a hydraulic bearing (2) with a support spring (36), a working chamber (4), which is filled with a hydraulic fluid, a compensating chamber (6), a partition (8) which is arranged between the working chamber (4) and the compensating chamber (6), a throttle channel (10) which is formed between the working chamber (4) and the compensating chamber (6) for exchanging hydraulic fluid, and a control membrane (12) which is paired with the partition (8) and which is designed to change a working chamber volume (14) of the working chamber (4). The hydraulic bearing (2) has an electromagnetic linear actuator (16) according to the invention, and the armature (20) is mechanically connected to the control membrane (12). The invention additionally relates to a motor vehicle with such a hydraulic bearing (2).