Active Damping of Electrical Line Vibrations From Modulated Currents
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Solution Overview
Problem
Mechanical vibrations in electrical lines of electric and hybrid vehicles, caused by high modulated currents, lead to audible noise and structural issues due to the forces generated by these currents.
Innovation Solution
An apparatus comprising sound or vibration sensors, actuators, and a control circuit that detects vibrations and generates control signals to counteract them, using electromagnetic or piezoelectric drives to dampen the vibrations effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high modulated currents are used in electrical lines, then power control efficiency is improved, but mechanical vibrations and audible noise increase
Solution Approach 1:
The patent applies active vibration control by generating counter-vibrations through actuators. The control circuit detects vibrations in the electrical line and generates compensating vibrations through actuators mounted on the line, effectively canceling out the harmful mechanical vibrations caused by high modulated currents while maintaining power control efficiency
Solution Approach 2:
The patent implements a feedback control system where vibrations are detected by sensors, processed by a control circuit, and corrected by actuators in real-time. The control circuit continuously monitors the vibration state of electrical lines and adjusts actuator output accordingly, creating a closed-loop system that actively suppresses vibrations generated by high current modulation
2Object-generated harmful factors
If actuators are added to counteract vibrations, then vibration damping is improved, but device complexity increases
Solution Approach 1:
The patent introduces actuators as intermediary devices mounted on electrical lines to convert electrical control signals into mechanical counter-vibrations. These actuators serve as mediators between the control circuit and the vibrating electrical line, enabling vibration suppression without requiring fundamental changes to the power electronics system
Solution Approach 2:
The patent replaces passive mechanical vibration isolation methods with active electromagnetic or piezoelectric actuators. Instead of using heavy mechanical dampers or isolation mounts, the system uses controllable electromagnetic or piezoelectric devices that can dynamically adjust their output to match the varying vibration characteristics of high-current electrical lines
3Measurement precision
If sensors and actuators are integrated on electrical lines, then vibration detection precision is improved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the vibration control system into modular components: vibration sensors mounted on specific sections of electrical lines, control circuits positioned at accessible locations, and actuators distributed at key vibration points. This segmentation allows each component to be optimized and tested independently before integration, simplifying the manufacturing process while maintaining high detection precision
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 effectively reduces the maximum vibration amplitude of electrical lines, minimizing audible noise and structural disruptions, while also allowing for adaptive control based on current intensity and modulation patterns.
Implementation Method 1
The at least one actuator can have, for example, an electromagnetic or piezoelectric drive which is controlled by the control circuit such that it generates a force which counteracts the force generated by the current flow
Implementation Method 2
The at least one actuator can have, for example, an electromagnetic or piezoelectric drive which is controlled by the control circuit such that it generates a force which counteracts the force generated by the current flow
Implementation Method 3
The control circuit is supplied, via respective signal lines, with signals generated by the at least one sound or vibration sensor that represent sound or vibrations
Implementation Method 4
The actuator itself can introduce a vibration into the cable, which vibration disrupts a vibration generated by the current flowing in the line by way of destructive interference and thus leads to an overall smaller vibration amplitude
Implementation Method 5
The actuator can be mounted in an elastically damping element, for example
Data Source
AI summary
An apparatus (100) for damping vibrations in electrical lines (10) through which modulated currents flow has at least one sound or vibration sensor (102) oriented towards the line (10) or attached to the line, at least one actuator (104) connected to the line, and a control circuit (200) which is supplied, via respective signal lines (108), with signals generated by the at least one sound or vibration sensor (102) that represent sound or vibrations. The control circuit controls the at least one actuator (104) via respective control lines (110) such that this actuator counteracts the vibration of the line (10).