Seat Suspension Balanced-Point Control for Vibration Absorption
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Solution Overview
Problem
Existing seat suspension mechanisms require manual adjustment for balanced point calibration, which is inaccurate and cannot adapt to changes during vibration or impact, affecting vibration and impact absorption characteristics.
Innovation Solution
A seat suspension mechanism with a body weight adjustment mechanism that automatically adjusts the upper frame's position using a torsion angle detection sensor and elastic force adjusting unit, combined with a spring mechanism including torsion bars and a magnetic spring, to maintain a balanced point during seating and dynamic conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual adjustment using an adjustment dial is used to calibrate the balanced point, then the initial position can be adjusted when a person is seated, but the adjustment is troublesome and inaccurate, and cannot adapt to changes during vibration or impact
Solution Approach 1:
The system uses a sensor to automatically detect the actual balanced point position and a controller to automatically adjust the initial position, eliminating the need for manual operation. The system serves itself by automatically calibrating the balanced point without user intervention, thereby improving both ease of operation and measurement precision.
Solution Approach 2:
The manual mechanical adjustment dial is replaced with an automated system comprising a sensor (for detection) and a controller that actuates the adjustment mechanism. This substitution of mechanical manual operation with an automated sensing and control system resolves the contradiction by providing both ease of operation (automatic) and high precision (sensor-based detection).
2Device complexity
If the upper frame position is fixed at the neutral position, then the structure is simple, but the balanced point varies when persons of different weights sit, reducing vibration and impact absorption characteristics
Solution Approach 1:
The system dynamically adjusts the initial position of the upper frame based on real-time detection of the actual balanced point. Rather than being fixed, the system adapts its configuration to match the current load conditions, thereby improving adaptability to different person weights while maintaining reasonable structural complexity through automated control.
Solution Approach 2:
The sensor continuously detects the actual balanced point position, and the controller uses this feedback information to automatically adjust the initial position. This closed-loop feedback mechanism enables the system to adapt to different person weights automatically, resolving the contradiction between structural simplicity and adaptability.
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 mechanism improves vibration and impact absorption characteristics by automatically adjusting the upper frame's position to the balanced point, ensuring consistent damping and enhanced motion phase-shifting capabilities.
Implementation Method 1
The magnetic spring includes: stationary magnets fixed to the lower frame; and a movable magnet which is linked to the upper frame through links and moves relative to the stationary magnets in accordance with the up-down movement of the upper frame
Implementation Method 2
a characteristic that restoring force in the same direction as a working direction of restoring force of the torsion bars increases in accordance with an increase in a displacement amount is referred to as a positive spring characteristic
Implementation Method 3
energy caused by vibration or impact is absorbed by a damper suspended between the upper frame and the lower frame
Data Source
AI summary
A body weight adjustment mechanism for automatic adjustment to a balanced point is provided to improve vibration absorption characteristics and impact absorption characteristics. A torsion angle of a lower frame-side torsion bar when an upper frame is at a balanced point is found in advance, a torsion angle of the lower frame-side torsion bar in a state in which a person is seated is detected, the detected torsion angle is compared with the aforesaid balanced point torsion angle, a control signal is sent to an elastic force adjusting unit, and torsion angles of upper frame-side torsion bars are adjusted so that the torsion angle of the lower frame-side torsion bar becomes equal to the balanced point torsion angle. The upper frame can be set to an appropriate position in an initial state and a static state in which a person is seated and vibration and impact absorption characteristics are improved.