Dual-Rate Spring Assembly for Nonlinear Force Simulation
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Solution Overview
Problem
Existing spring systems for simulating nonlinear forces are cumbersome, heavy, and lack compactness, necessitating improvements to simplify and lighten the mechanism.
Innovation Solution
A dual-rate spring system with a carriage and two springs arranged in series, where both springs compress initially, then only one continues to compress, altering the effective spring constant, and featuring retainer elements with recesses to prevent coil binding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional spring systems are used to simulate nonlinear forces, then the force simulation capability is achieved, but the mechanism becomes cumbersome, heavy, and less compact
Solution Approach 1:
The spring system is segmented into multiple springs (at least two) arranged in series, each with different spring rates. This segmentation allows the system to simulate nonlinear forces more accurately while maintaining a compact and simple structure, as each spring segment contributes to different portions of the force-deflection curve.
Solution Approach 2:
The system changes the effective spring rate parameter dynamically through the stroke by transitioning from one spring dominating to another spring dominating. This parameter change enables accurate nonlinear force simulation without requiring complex mechanisms, as the spring rate naturally varies with compression distance.
2Adaptability or versatility
If multiple springs are arranged in series to achieve variable spring rate, then the nonlinear force simulation is improved, but the risk of coil binding increases
Solution Approach 1:
The springs are arranged concentrically with one spring nested inside another, sharing a common central axis. This nested arrangement allows multiple springs to occupy minimal space while maintaining independent compression paths, enabling variable spring rate without increasing the risk of coil binding.
Solution Approach 2:
The springs are positioned at different radial distances from the central axis, utilizing the radial dimension to differentiate their compression paths. This dimensional arrangement ensures that when one spring is compressed, the other springs provide guidance and prevent coil binding through their concentric positioning.
3Volume of moving object
If concentric springs are used to reduce space, then compactness is achieved, but the mechanism requires precise alignment and guidance
Solution Approach 1:
The guide rod serves multiple functions simultaneously: it provides mechanical guidance for the carriage, acts as a common central axis for the concentric springs, and prevents lateral misalignment. This multi-functionality reduces the need for separate alignment components and simplifies the overall mechanism.
Solution Approach 2:
The guide rod acts as an intermediary element that mediates between the carriage and the spring system. It transmits the applied force while maintaining precise alignment of the concentric springs, eliminating the need for complex alignment mechanisms and reducing operational complexity.
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 effectively simulates nonlinear forces with a variable spring rate, enhancing the mechanism's compactness and efficiency by maintaining a consistent force profile through the stroke.
Implementation Method 1
a spring system for providing an elastic force between two machine parts
Data Source
AI summary
Non-linear forces are simulated by a dual-rate spring apparatus, which may also be used to impose nonlinear forces. The apparatus includes a carriage and at least two springs arranged sequentially in series with one another. The spring constant is changed by initially allowing both of the springs to compress to a point and, thereafter, after one spring is generally completely compressed, allowing only the other spring to compress further.