Resonance Testing Machine High-Frequency Fatigue Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing resonance testing machines struggle to achieve high working frequencies required for modern fatigue testing, as hydraulic systems require excessive energy and maintenance, ultrasonic systems cause overheating and indirect stress measurement, and electromagnetic systems are limited by low operating frequencies.
Innovation Solution
A four-mass resonance testing machine with a resonator designed to operate between 1000 and 2000 Hz, featuring a seismic mass, oscillating body, oscillating head, and traverse, with electromagnetic vibration exciters and a unique spring configuration to achieve high-frequency oscillations while minimizing heating and stress measurement issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If hydraulic systems are used for dynamic loading, then operating frequency can be achieved, but energy input becomes excessive and maintenance costs increase
Solution Approach 1:
The patent employs a mechanical resonance testing machine that utilizes vibrational motion to apply dynamic loads to test specimens. The system uses a vibrating body connected through elastic elements to the test specimen, generating controlled vibrations at resonant frequencies. This mechanical vibration approach replaces hydraulic systems, achieving high operating frequencies (1000-2000 Hz) with significantly reduced energy consumption and eliminated need for hydraulic fluid and valves.
Solution Approach 2:
The patent changes the operating parameters by using electromagnetic exciters instead of hydraulic actuators, enabling operation in the resonance range of 1000-2000 Hz. The system adjusts the excitation frequency to match the natural resonant frequency of the test specimen, maximizing efficiency and minimizing energy input while achieving the desired dynamic loading effects.
2Speed
If ultrasonic systems are used for high frequency testing, then operating frequency increases, but test specimens overheat and testing must be performed intermittently
Solution Approach 1:
The patent uses mechanical vibration at resonant frequencies (1000-2000 Hz) rather than ultrasonic frequencies, generating sufficient dynamic stress for fatigue testing without the excessive heat generation associated with ultrasonic testing. The resonant vibration efficiently transfers energy to the test specimen, producing the required load cycles while maintaining acceptable temperature levels for continuous testing.
Solution Approach 2:
The system applies periodic dynamic loading through controlled resonant vibrations, cycling the test specimen through stress cycles at optimized frequencies. This periodic action delivers the necessary fatigue loading while allowing heat dissipation between cycles, preventing the cumulative overheating that occurs with continuous ultrasonic testing.
3Speed
If electromagnetic systems are used for resonance testing, then operating frequency is achieved, but frequency is limited to low ranges
Solution Approach 1:
The patent implements a mechanical resonance system where a vibrating body, connected through elastic elements to the test specimen, generates mechanical vibrations at controlled frequencies. This mechanical vibration mechanism, driven by electromagnetic exciters, successfully achieves operating frequencies of 1000-2000 Hz, overcoming the limitation of traditional electromagnetic systems that are constrained to lower frequencies.
Solution Approach 2:
The system changes the frequency parameter by optimizing the mass and stiffness characteristics of the vibrating body and elastic elements to achieve resonant frequencies in the 1000-2000 Hz range. This parameter optimization allows the electromagnetic exciter to drive the mechanical system at the desired higher frequencies, significantly increasing productivity through more load cycles per second.
4Device complexity
If traditional resonance testing machines are used, then structure is simple, but operating frequency cannot reach 1000-2000 Hz
Solution Approach 1:
The patent employs a mechanical resonance testing machine with a vibrating body connected through elastic elements to the test specimen. This mechanical vibration system, while maintaining relatively simple structure compared to hydraulic or ultrasonic systems, achieves operating frequencies of 1000-2000 Hz through proper design of the vibrating mass and elastic element stiffness, balancing structural simplicity with high-frequency capability.
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 continuous, high-frequency fatigue testing with efficient energy use, reduced maintenance, and direct stress measurement, accommodating higher load cycle requirements without overheating or shape limitations.
Implementation Method 1
at least two electromagnetic vibration exciters (70), each having a first electromagnet (72) with a magnetic core (75) and a plate-shaped, movable armature plate (80)
Implementation Method 2
spring elements (85) arranged concentrically around the longitudinal axis x... a vibrating spring (45) consisting of a Bourdon tube (50) and an anchor spring (60)
Implementation Method 3
The resonator (155) is designed such that its natural frequency lies in the range of 1000 to 2000 Hz... the oscillating head (10) is set into a longitudinal harmonic oscillation along the axis x
Data Source
Figure 1
Figure 2
AI summary
Resonance testing machine for the fatigue strength testing of a test specimen (120) clamped between a crossbeam (40) and a vibrating head (10). The vibrating head (10), the test specimen (120), and the crossbeam (40) are part of a second sub-vibration system (150) that can be vibrated along an axis x. In this second sub-vibration system, the test specimen (120) and a resonator (155) containing the vibrating head (10), a vibrating spring (45), and a vibrating body (20) are arranged sequentially in series along the axis x. A first sub-vibration system (160), also vibrating along the axis x, is arranged in series with the second sub-vibration system (150) and the resonator (155). The first sub-vibration system (160) contains the vibrating body (20), spring elements (85), a seismic mass (30), and electromagnetic vibration exciters (70).