Ultrasonic Sensor Vibration Damping for Bumper Mounting
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Solution Overview
Problem
Ultrasonic wave sensors attached to metal bumpers often experience prolonged reverberation and erroneous detection due to efficient vibration transmission, leading to incorrect identification of reflected waves.
Innovation Solution
Incorporating a vibration prevention member, such as an elastic O-ring, between the flange and the bumper to attenuate vibration transmission, preventing erroneous detection by shortening reverberation time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ultrasonic wave sensor is attached to a metal bumper, then the vibration transmission is efficient, but the reverberation is prolonged causing erroneous detection
Solution Approach 1:
A vibration prevention member (elastic body) is introduced as an intermediary between the ultrasonic wave sensor and the metal bumper. This intermediary absorbs and attenuates the vibrations transmitted from the sensor to the bumper, preventing prolonged reverberation that causes erroneous detection, while still allowing the sensor to function effectively.
Solution Approach 2:
The physical state of vibration transmission is changed by introducing a material with different damping characteristics. The vibration prevention member alters the vibration transmission parameters between the sensor and bumper, reducing the amplitude and duration of reverberations to acceptable levels for accurate detection.
2Duration of action of stationary object
If the vibration prevention member is added, then the reverberation is reduced, but the device complexity increases
Solution Approach 1:
The vibration prevention member is implemented as a thin elastic body or flexible component that can be easily integrated into the sensor assembly. This thin-film approach provides effective vibration damping without adding significant structural complexity or bulk to the device.
Solution Approach 2:
The vibration prevention member uses a simple elastic body material that is inexpensive and easy to replace if needed. This approach keeps the solution cost-effective and maintains simplicity in the overall device structure while effectively addressing the reverberation issue.
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 vibration prevention member effectively reduces reverberation, preventing false detection of reflected waves and ensuring accurate distance measurement to obstacles.
Implementation Method 1
a vibration prevention member that is arranged on the back surface of the flange and is configured by an elastic body to prevent transmission of vibration of the ultrasonic vibrator
Data Source
AI summary
An ultrasonic wave sensor includes: a bezel configured by a tubular member having a hollow portion, and including a tubular portion and a flange, the flange having a larger radial dimension than the tubular portion, one surface of the flange on a side opposite to the tubular portion being a front surface, one surface of the flange on the tubular portion side being a back surface; a sensor body including an ultrasonic vibrator and integrated with the bezel while part of the sensor body is inserted into the hollow portion; and a vibration prevention member arranged on the back surface and configured by an elastic body to prevent vibration transmission. The vibration prevention member is an O-ring having an annular shape surrounding the bezel so as to surround a center axis of the bezel, and the back surface has a ring-shaped groove into which part of the O-ring is inserted.