Dual-Actuator Vehicle Vibration Test Stand
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Solution Overview
Problem
Existing vehicle test stands struggle to achieve an optimal excitation frequency range for comfort testing, as servo-hydraulic systems typically produce resonance frequencies too low for effective comfort testing, limiting the ability to simulate a broad range of vibrational behaviors.
Innovation Solution
A device with a dual-actuator system is introduced, comprising a main actuator system and an additional actuator system, where the additional actuator system is connected to the main actuator system, particularly at its movable end, allowing for a frequency range from a few Hertz to several hundred Hertz, with the additional actuators arranged in a configuration to optimize frequency application and reduce strain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single servo-hydraulic actuator system is used for vehicle excitation, then the system structure remains simple, but the excitation frequency range is limited to around 50 Hz which is too low for comfort testing
Solution Approach 1:
The actuator system is segmented into a main actuator system for low-frequency excitation and an additional actuator system for high-frequency excitation. This segmentation allows each subsystem to operate optimally within its frequency range, achieving a combined frequency range from a few Hz to several hundred Hz that would be impossible with a single actuator system.
2Adaptability or versatility
If the travel paths of servo cylinders are increased to improve excitation range, then the system becomes softer with lower resonance frequencies, but this further limits the high-frequency excitation capability
Solution Approach 1:
The segmented actuator system assigns different travel path characteristics to different frequency ranges. The additional actuator system has shorter travel paths optimized for high-frequency response, while the main actuator system has longer travel paths for low-frequency excitation, resolving the contradiction between travel path length and resonance frequency.
Solution Approach 2:
The system changes the effective mass and spring constant parameters by switching between different actuator configurations. The additional actuator system effectively reduces the moving mass and increases the spring constant, thereby increasing the resonance frequency for high-frequency excitation applications.
3Adaptability or versatility
If multiple actuators are added to expand frequency range, then the excitation capability improves, but the system complexity and strain on individual actuators increases
Solution Approach 1:
The frequency range is segmented into low-frequency and high-frequency bands, with each actuator system dedicated to a specific band. This segmentation reduces the complexity of controlling individual actuators across the entire frequency spectrum, as each actuator operates within its optimized frequency range.
Solution Approach 2:
The additional actuator system acts as an intermediary for high-frequency excitation, connected to the main actuator system. This intermediary configuration allows the main actuator to provide the primary excitation force while the additional actuator superimposes high-frequency components, reducing the strain on individual actuators.
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 enables improved excitation of vehicles across a broad frequency range, from 50 Hz to 600 Hz, allowing for more comprehensive simulation of vibrational behaviors, enhancing the testing capabilities of vehicle test stands.
Implementation Method 1
Actuators are used to place a vibrational excitation on the vehicle, for example in order to simulate a road travel
Implementation Method 2
Servo-hydraulic rains have specific eigenfrequencies according to the mass coupled to them
Implementation Method 3
Hydraulic test stands are known from the prior art, which use servo-hydraulic rains for the excitation of the vehicle
Implementation Method 4
Oil is generally considered to be incompressible, as opposed to air, but a certain compressibility is present at appropriately high pressure
Implementation Method 5
The elasticities and thus the spring hardness is determined by the strength of the cylinder tube, for example, but also that of the piston and the piston rod
Data Source
AI summary
The disclosed embodiments relate to a test stand for the simulation of the vibration behavior of a vehicle. The test stand comprises a receiving element for contacting with a vehicle and an excitation system for the application of excitation frequencies. The excitation system comprises a main actuator system with at least one movable main actuator and an additional actuator system with at least one movable additional actuator, the additional actuator system being connected to the main actuator system.