Active Vibration Isolator Current Offset for Heat Reduction
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Solution Overview
Problem
Conventional active vibration isolating support apparatuses fail to effectively suppress higher-order vibrations and result in wasteful heat release due to non-zero minimum values in target currents, which include a direct current component.
Innovation Solution
An active vibration isolating support apparatus that calculates a combined target current by synchronizing a primary target current with a secondary target current to cancel secondary vibrations, ensuring the minimum value of the combined target current is offset to zero, thereby preventing direct current components in the target driving current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both primary target current and higher-order target current are combined to suppress both primary and higher-order vibrations, then vibration isolation effect is improved, but direct current component rides on the target current causing wasteful heat release in the actuator
Solution Approach 1:
The patent applies parameter changes by modifying the target current waveform through offset adjustment. Specifically, the minimum value of the combined target current (which would normally be non-zero due to DC components) is shifted to zero, transforming the current parameters to eliminate the DC component while preserving the AC vibration-canceling components. This allows both primary and higher-order vibrations to be suppressed without causing wasteful heat release.
2Loss of energy
If only primary vibration is suppressed by driving actuator with primary target current, then actuator heat release is reduced, but higher-order vibrations are not suppressed leading to insufficient vibration isolation
Solution Approach 1:
The patent merges the primary target current and higher-order target current into a single combined target current waveform. By superimposing these two current components and then applying an offset to eliminate the DC component, the system achieves both primary and higher-order vibration suppression simultaneously without the wasteful heat release that would result from simply adding the magnitudes of the two currents.
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
Enhances vibration isolation by canceling both primary and secondary vibrations while minimizing heat release from the actuator.
Implementation Method 1
driving an actuator to extend and contract on a predetermined cycle with a current which corresponds to a primary vibration of the vibrating unit
Data Source
AI summary
When driving an actuator 41 of an active vibration isolating support apparatus M to extend and contract on a predetermined cycle so as to suppress the transmission of vibrations of an engine, since a combined target current ICMDT is calculated by combining a primary target current which cancels a primary vibration of the engine with a secondary target current which cancels a secondary vibration of the engine and furthermore, the actuator 41 is driven with a target driving current ICMD in which a minimum value of the combined target current ICMDT is offset to 0, can the primary vibration and the secondary vibration of the engine be cancelled so as to enhance a vibration isolating function and the inclusion of a direct current component into the target driving current ICMD can be prevented so as to suppress a wasteful heat release of the actuator 41 to a minimum level.