Rail Transfer Vehicle Braking Torque Control Against Wheel Slip
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Solution Overview
Problem
Existing braking systems for rail-mounted transfer vehicles, such as container gantry cranes, face issues with reliable deceleration and stopping due to high center of gravity, potential overload of supporting frames, and irregular wheel movement, leading to vibrations and undesired slippage, especially under varying weather conditions.
Innovation Solution
A braking system that includes a brake arrangement adjustable between braking and venting positions, a control unit determining and applying settable braking torque based on operating state and external influence data, and a sensor arrangement monitoring the vehicle's state and external factors to prevent wheel sliding and frame overload, using various brake types (drum, disk, and electrohydraulic) with an uninterruptible power supply for fail-safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anti-lock braking systems adjust braking torque via driving dynamics measurements, then braking control is improved, but vibrations occur in the supporting frame causing wheel slippage
Solution Approach 1:
The braking system dynamically adjusts braking torque based on real-time measurements of wheel angular acceleration and rail adhesion conditions. The control unit continuously modifies braking torque to optimize deceleration while preventing wheel lockup and slippage, adapting to changing operational conditions rather than using fixed braking patterns
Solution Approach 2:
The system employs feedback mechanisms by measuring wheel angular acceleration and rail adhesion conditions, then using this information to adjust braking torque. The control unit receives continuous data from sensors and modifies braking force accordingly, creating a closed-loop control system that prevents vibrations and slippage through active correction
2Speed
If high braking torque is applied to decelerate the transfer vehicle, then stopping performance is improved, but wheel locking and sliding on rails occurs
Solution Approach 1:
The system applies braking torque that is sufficient to achieve desired deceleration but carefully controlled to remain below the threshold that would cause wheel lockup. By measuring wheel angular acceleration and rail adhesion, the system applies just enough braking force to slow the vehicle without exceeding traction limits, avoiding wheel sliding while maintaining effective deceleration
3Adaptability or versatility
If frequent changes to braking torques are made, then braking adaptability is improved, but vibrations are generated in the supporting frame
Solution Approach 1:
The system uses periodic measurements of wheel angular acceleration and rail adhesion conditions to determine when braking torque adjustments are necessary. Rather than continuously or frequently adjusting braking torque, the system performs adjustments at optimal intervals based on actual changes in operational conditions, reducing unnecessary vibrations while maintaining 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 system effectively adapts braking torque to prevent wheel sliding and frame overload, ensuring reliable deceleration and stopping while maintaining traction, even under adverse weather conditions, by dynamically adjusting braking torque based on real-time data and using a fail-safe mechanism for power failures.
Implementation Method 1
a brake arrangement (206) which can be adjusted between a braking position and a venting position and which is designed to exert a settable braking torque in the braking position
Data Source
AI summary
A braking system for a rail-mounted traveling unit of a transfer vehicle. A brake arrangement can be adjusted between a braking position and a venting position and which is designed to exert a settable braking torque in the braking position. A control unit is designed to determine a braking torque and to activate accordingly the brake arrangement. A sensor arrangement detects an operating state of the transfer vehicle and external operating influences and transmits these to the control unit. During operation of the transfer vehicle the sensor arrangement detects the operating state of the transfer vehicle and the external operating influences on the transfer vehicle at periodic intervals and transmits these to the control unit as operating state data and operating influence data. During a braking process, the control unit determines a braking torque to be applied and activates the brake arrangement.