Dynamic Characteristic Measurement Device High-Frequency Vibration Analysis
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Solution Overview
Problem
Conventional dynamic characteristic measurement devices are limited to measuring vibrations up to 1.5 kHz, failing to accurately assess high-frequency vibrations, and struggle with measuring small dynamic loads under preloads due to resonance frequency interference, especially in the context of rubber isolators for vehicles with electric motors which require analysis up to 3 kHz.
Innovation Solution
A dynamic characteristic measurement device featuring a crosshead with a resonance frequency set above 4 kHz, utilizing air springs and an electrodynamic vibrator with a control system that applies preload and adjusts measurement ranges to accurately measure dynamic loads and characteristics in the high-frequency range up to 3 kHz, employing a resonant jig and load washers for precise load detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional dynamic characteristic measurement devices are used, then measurement can be performed up to 1.5 kHz, but accurate measurement of high-frequency vibrations up to 3 kHz cannot be achieved
Solution Approach 1:
The patent changes the resonance frequency parameter of the support part by modifying its shape, specifically designing it to have a resonance frequency of 3 kHz or higher. This parameter change enables the measurement device to accurately measure vibrations in the high-frequency range up to 3 kHz without interference from structural resonance, thereby resolving the contradiction between measurement frequency range and measurement accuracy.
2Measurement precision
If resonance frequency of support part is not controlled, then device structure is simple, but measurement accuracy is degraded due to resonance interference
Solution Approach 1:
The support part is designed with specific shape parameters to achieve a resonance frequency of 3 kHz or higher. By controlling the shape parameters of the support part, the resonance frequency is adjusted to be above the measurement range, eliminating resonance interference while maintaining a relatively simple overall device structure.
3Measurement precision
If measurement range is not adjusted under preload, then device operation is simple, but small dynamic loads cannot be measured accurately
Solution Approach 1:
The measurement range of the dynamic load sensor is made adjustable to adapt to different preload conditions. When preload is applied, the measurement range can be switched to detect small dynamic loads accurately. This dynamic adjustment capability allows the device to maintain ease of operation while achieving high measurement precision under various loading conditions.
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
Enables accurate measurement of dynamic vibration characteristics in the high-frequency range up to 3 kHz by eliminating resonance frequency influence, allowing for precise assessment of rubber isolators under preloads, enhancing vibration amplitude and measurement accuracy.
Implementation Method 1
a crosshead 124 which is placed above the base 110 so as to be capable of floating via an elastic body
Implementation Method 2
an electrodynamic vibrator 113 capable of applying vibration in a high-frequency range up to 3 kHz
Implementation Method 3
a dynamic load sensor arranged between the electrodynamic vibrator vibrating table 132 and the object 131 under test
Data Source
Figure 1
Figure 2~2(b)
Figure 3
AI summary
An object of the present invention is to provide a dynamic characteristic measurement device capable of accurately measuring dynamic vibration characteristics of a rubber isolator and the like in a high-frequency vibration range. A dynamic characteristic measurement device according to the present invention includes a base, a support part that is placed above the base so as to be capable of floating via an air spring, an electrodynamic vibrator that is provided on the base side of an object under test mounted between the base and the support part and vibrates the object under test, and a load washer that is provided on the support part side of the object under test and measures a dynamic load applied to the object under test. Here, a crosshead of the support part is shaped such that a resonant frequency is at least 3 kHz.