Parallel Capillary Tube Shock Absorber for Variable Natural Frequency
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Solution Overview
Problem
Hydraulic shock absorbers for vehicles have a non-adjustable or limitedly adjustable system natural frequency, affecting vibration amplitude and vehicle comfort during travel.
Innovation Solution
A matrix type double parallel capillary tube shock absorber with a variable system natural frequency, featuring a capillary tube parallel type damping section and a capillary tube parallel type system natural frequency section, where solenoid valves control the operation of capillary tubes to adjust damping and natural frequency, allowing for a wide range of frequency adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the system uses a fixed configuration of capillary tubes and solenoid valves, then the damping force is determined, but the system natural frequency cannot be adjusted
Solution Approach 1:
The shock absorber divides the capillary tube system into multiple independent sections (first capillary tube section with damping force adjustment, second capillary tube section with natural frequency adjustment). Each section can be controlled independently through solenoid valves, allowing separate optimization of damping force and natural frequency without interfering with each other's functions
Solution Approach 2:
The patent implements dynamic adjustability by using solenoid valves to control the opening and closing of different capillary tube sections. This allows the system natural frequency to be changed dynamically during operation by switching between different configurations, transforming a static system into a dynamically adjustable one
2Reliability
If the mass of the oscillating fluid is increased, then the system natural frequency decreases, but the damping capability is improved
Solution Approach 1:
The patent segments the fluid mass into two functional groups: one group in the first capillary tube section that primarily provides damping, and another group in the second capillary tube section that primarily affects natural frequency. By independently controlling which groups are active, the system can adjust the ratio of damping to natural frequency
Solution Approach 2:
The patent changes the physical parameters of the system by varying the effective mass of oscillating fluid and the flow resistance characteristics through solenoid valve control. This allows continuous adjustment of the damping coefficient and natural frequency parameters to optimize performance for different operating 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
The solution enables digital adjustment of the system natural frequency, significantly improving the quality of the hydraulic shock absorber's performance and enhancing vehicle comfort by expanding the adjustable range of the system natural frequency.
Implementation Method 1
capillary tube parallel type damping associated section (21) and a capillary tube parallel type system natural frequency associated section (22)
Data Source
AI summary
Provided is a matrix type double parallel capillary tube shock absorber with a variable system natural frequency, wherein on a pipeline between oil supply ports of an upper oil compartment (14) and a lower oil compartment (16), a capillary tube parallel type damping associated section and a capillary tube parallel type system natural frequency associated section are successively connected from top to bottom; the capillary tube parallel type damping associated section comprises four capillary tubes connected in parallel, with each capillary tube being connected in series with a solenoid valve so as to control the operation of the capillary tube; the capillary tube parallel type system natural frequency associated section comprises four capillary tubes connected in parallel, and each of the four capillary tubes is connected in series with a solenoid valve so as to control the operation of the capillary tube; the diameter of the smallest capillary tube of the frequency adjustment section is much larger than the diameter of the capillary tube of the resistance adjustment section; and in a matrix type operation state table, the configuration value Smn of the solenoid valves of the frequency adjustment section is selected according to situations, and by way of changing the mass, the problem of the system natural frequency of a hydraulic shock absorber for a vehicle being not adjustable or having a small adjustable range can be solved. Further provided is a method for operating a matrix type double parallel capillary tube shock absorber with a variable system natural frequency.