Active Mount Vibration Control Using Magnetic Yoke and Metallic Scraps
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Solution Overview
Problem
The existing active mounts using the by-pass method suffer from a decrease in loss factor and deterioration of dynamic characteristics due to hydraulic liquid flow through the second flow path, even when the hole is closed, leading to incomplete vibration blocking.
Innovation Solution
The active mount incorporates a nozzle plate with a second flow path spaced apart from the first, a magnetized yoke, and metallic scraps on the diaphragm to restrict elastic behavior, ensuring complete vibration blocking by allowing the yoke to magnetize and the scraps to come into contact with the body portion, thereby controlling hydraulic liquid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hole is closed by a rod portion using electromagnetic force to block vibration, then vibration blocking is improved, but incomplete blocking occurs due to elastic behavior of the diaphragm part portion
Solution Approach 1:
The patent replaces the purely mechanical rod portion closure system with an electromagnetic actuation system that uses a coil and magnet to generate magnetic force. This magnetic force acts on the rod portion to close the hole more effectively, overcoming the insufficient mechanical force that allowed elastic deformation to prevent complete blocking.
Solution Approach 2:
The patent changes the physical state or properties of the system by introducing electromagnetic parameters (magnetic force) to control the closure mechanism. The magnetic force generated by the coil and magnet interaction provides a controllable parameter that can overcome the elastic deformation of the diaphragm part portion, ensuring complete hole closure when needed.
2Reliability
If the second flow path is used to allow communication between liquid chambers, then vibration attenuation in certain frequency regions is improved, but loss factor decreases and dynamic characteristics deteriorate
Solution Approach 1:
The patent makes the second flow path dynamically controllable by placing a movable rod portion that can open or close the path based on vibration conditions. The rod portion is actuated by electromagnetic force to close the second flow path when needed, dynamically switching between open and closed states to optimize both vibration attenuation and loss factor under different operating conditions.
Solution Approach 2:
The patent extracts or removes the detrimental effect of continuous hydraulic liquid flow through the second flow path by introducing a closure mechanism (rod portion) that can block the flow path when necessary. This selective blocking removes the energy loss associated with unwanted flow while maintaining the beneficial vibration attenuation when the path is open.
3Manufacturing precision
If metallic scraps are mounted on the diaphragm part portion, then elastic deformation is restricted and hole closure is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by mounting metallic scraps specifically on the diaphragm part portion (the specific location where elastic deformation occurs). This localized treatment restricts elastic deformation precisely where needed without requiring complex structural modifications throughout the entire device, thereby improving hole closure precision with minimal increase in overall device complexity.
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 effectively maximizes the loss factor and dynamic characteristics by ensuring hydraulic liquid flow is restricted through the second flow path, efficiently attenuating vibrations across different frequency bands with reduced production costs and improved durability.
Implementation Method 1
When electric power is applied to the coil 106, the rod portion 108 is moved upward by electromagnetic force and closes the hole 105
Implementation Method 2
metallic scraps are mounted to a part portion, which constitutes a second lower liquid chamber, to suppress elastic deformation of the part portion using magnetic force
Data Source
AI summary
An active mount in which a nozzle plate is mounted between an insulator and a diaphragm to divide an inner space into an upper liquid chamber and a lower liquid chamber, and an encapsulated hydraulic liquid flows from the nozzle plate through a first flow path depending on a change in fastened state of the liquid chambers may include the nozzle plate having a second flow path and allowing the upper liquid chamber and the lower liquid chamber to be in communication with each other, the diaphragm made of a material having elasticity and coupled to a lower portion of the nozzle plate to form the lower liquid chamber, the diaphragm having an inflection portion, and a yoke including a body portion having an upper end in close contact with a lower portion of the inflection portion, and a rod portion coupled to a lower portion of the body portion.