Booster Yaw Mitigation in Articulated Heavy Haul Trailers
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Solution Overview
Problem
Heavy haul trailers with articulated boosters experience instability during turns due to yaw-induced forces, which can lead to rollover and impaired tracking, as existing solutions do not adequately address the angular forces caused by the booster's yawing motion.
Innovation Solution
A hydraulic system with a downwardly extending cylinder from the trailer to the booster, coupled with a turn sensor and controller, reduces the load bias on the booster during yaw, allowing the trailer to absorb more load and mitigate the disruptive forces, enabling better turn tracking and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the booster is used to distribute load over several axles, then load distribution is improved, but the booster induces yaw forces that cause trailer roll and tracking problems during turns
Solution Approach 1:
The hydraulic cylinder's piston position is dynamically adjusted based on turn detection. During straight travel, the piston maintains a retracted position for normal load distribution. When a turn is detected via sensor, the piston automatically extends to lift the booster, reducing its yaw-induced roll effect on the trailer. This dynamic adjustment resolves the contradiction between load distribution and turn stability.
Solution Approach 2:
A sensor detects the trailer's turning motion and provides feedback to the hydraulic control system. This feedback mechanism enables the system to automatically respond to turn conditions by adjusting the hydraulic cylinder's piston position, thereby reducing the booster's load and mitigating its destabilizing yaw forces during turns while maintaining load distribution during straight travel.
2Force
If the hydraulic cylinder applies downward biasing force to the booster, then load sharing between trailer and booster is improved, but the booster's yaw-induced roll effect on the trailer increases during turns
Solution Approach 1:
The hydraulic cylinder's biasing force is dynamically controlled based on operating conditions. During straight travel, the cylinder applies full downward biasing force to optimize load sharing. When a turn is detected, the piston extends to reduce the biasing force, thereby reducing the booster's yaw-induced roll effect. This dynamic force adjustment resolves the contradiction between load sharing and roll mitigation.
Solution Approach 2:
The system applies preliminary anti-action by detecting the turn condition before the harmful roll effect fully develops. The sensor detects the turn and triggers the hydraulic cylinder to extend, preemptively reducing the booster's load and its potential to generate harmful yaw-induced roll forces, rather than reacting after the roll effect has already occurred.
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 effectively reduces the booster-induced forces on the trailer during turns, enhancing stability and tracking by dynamically adjusting the load distribution based on yaw detection, thereby minimizing the risk of rollover and improving turn performance.
Implementation Method 1
A hydraulic cylinder extends at a downward angle from the trailer to the booster. The hydraulic cylinder may be used to normally bias the booster to impose a controlled measure of load sharing with the trailer.
Implementation Method 2
A rotary sensor determines whether the booster is yawing in relation to the trailer.
Implementation Method 3
When yaw is detected, the pressure applied to the booster by the hydraulic cylinder is reduced to effectively unload the booster and to cause the trailer to absorb more of the load.
Data Source
AI summary
An improved articulated heavy haul trailer combination comprises a trailing accessory vehicle such as a booster coupled to a main trailer by a coupling. The coupling includes a horizontal hinge, a vertical hinge that allows the trailing accessory vehicle to yaw in a horizontal plane, a spreader extending between the hinges and a hydraulic piston and cylinder. A turn sensor mounted on said combination detects yawing, and a controller reduces the piston and cylinder's downward biasing force on the coupling.