Torque Rod Vibration Sensor Positioning for Axial Resonance Detection
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Solution Overview
Problem
Conventional anti-vibration devices for vehicles fail to accurately detect rigid body resonance in the axial direction of a torque rod due to the detection of resonance components in both the axial and pitch directions, leading to reduced accuracy in vibration control.
Innovation Solution
The anti-vibration device is designed with a vibration detecting section positioned between the ends of the torque rod, avoiding the node of rigid body resonance in the pitch direction, enhancing the detection accuracy of axial direction resonance by isolating the detection from pitch direction vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the vibration detecting section is disposed between both ends of the torque rod to detect axial direction resonance, then the detection accuracy of axial direction rigid body resonance is improved, but the pitch direction rigid body resonance component is also detected which reduces accuracy
Solution Approach 1:
The patent applies local quality by positioning the vibration detecting section at a specific location between both ends of the torque rod where the node of pitch direction rigid body resonance occurs. This localized positioning ensures that the sensor detects axial direction resonance while the pitch direction resonance component is minimized at this specific point, thereby improving detection accuracy without requiring additional sensors or complex detection systems.
2Reliability
If the node of rigid body resonance in pitch direction is positioned between both ends of the torque rod, then the pitch direction resonance can be detected, but this causes interference with axial direction resonance detection
Solution Approach 1:
The patent resolves this contradiction by considering the spatial dimension and positioning the vibration detecting section at a specific location between both ends of the torque rod. By utilizing the spatial relationship and the node position of pitch direction resonance, the system can detect axial direction resonance while minimizing pitch direction interference, thus maintaining both reliability and measurement 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
This configuration improves the accuracy of detecting rigid body resonance in the axial direction, effectively suppressing vibrations transmitted from the engine to the vehicle body by generating distinct resonance frequencies for engine and torque rod rigid body resonances, achieving a double vibration-proofing effect.
Implementation Method 1
a vibration detecting section disposed between both ends of a torque rod which are fixed to an engine and a vehicle body, respectively
Implementation Method 2
operate an actuator to generate a force that is proportional to an axial direction displacement velocity of the rod
Implementation Method 3
set a rigid body resonance frequency of a torque rod to a value lower than that of the engine and operate an actuator to generate a force that is proportional to an axial direction displacement velocity of the rod
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
An anti-vibration device for a vehicle including a rod (11) fixed to an engine (1) at one end portion (12) thereof and fixed to a vehicle body at the other end portion (13) thereof, an inertia mass (15) supported on the rod (11), an actuator (17) operative to reciprocate the inertia mass in an axial direction of the rod, and an acceleration sensor (21) that detects vibration of the rod in the axial direction. The acceleration sensor (21) is disposed between the one end portion (12) of the rod (11) and the other end portion (13) of the rod (11). Accordingly, sensitivity to pitch vibration of the rod (11) is reduced so that accuracy in detection of rigid body resonance in the axial direction is enhanced.