Cable Car Roller Speed Control for Oscillation Damping
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Solution Overview
Problem
Cable transport installations face issues with pumping phenomena, which cause mechanical fatigue, potential collisions, and passenger discomfort due to oscillations in cable lines, making it challenging to predict and prevent these oscillations effectively.
Innovation Solution
A method for controlling cable transport installations by measuring the translation speed of the cable at intermediate supports and drive pulleys, comparing the differences, and adjusting the rotation speed of support rollers using a motor or braking mechanism to actively dampen oscillations, thereby directly addressing the longitudinal dynamic movement of the cable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If empirical criteria are applied during design to avoid pumping, then the complexity of prediction models is reduced, but the ability to systematically prevent oscillations under varying operating conditions deteriorates
Solution Approach 1:
The patent implements dynamic control of support rollers that can actively adjust their rotation speed to counteract oscillations in real-time. The support rollers transition from static passive elements to dynamic active elements that respond to detected cable speed variations, enabling the system to adapt to changing operating conditions and reliably prevent pumping phenomena.
Solution Approach 2:
The patent employs a feedback control system where cable speed is continuously measured at intermediate supports and compared to reference values. Based on this feedback, the rotation speed of support rollers is automatically adjusted to counteract detected oscillations, creating a closed-loop control system that systematically prevents pumping rather than relying on static design criteria.
2Extent of automation
If active oscillation control is implemented by modifying drive system parameters globally, then the system can respond to detected oscillations, but the control action is not direct or targeted on the local oscillation
Solution Approach 1:
The patent applies local quality by equipping individual support rollers at intermediate supports with independent motorization and control. Each support roller can be controlled locally based on measurements taken at its specific location, allowing targeted counteraction of oscillations at the source rather than applying global drive system modifications that affect the entire cable loop.
Solution Approach 2:
The patent segments the cable support system into independently controllable support rollers at intermediate supports. Each support roller operates as an independent control unit with its own motor and sensor, allowing localized oscillation control without affecting other parts of the system, thereby providing direct and targeted control action.
3Ease of manufacture
If support rollers are made free to rotate independently without control, then the mechanical simplicity is maintained, but the ability to actively dampen cable oscillations is lost
Solution Approach 1:
The patent replaces the purely passive mechanical support roller system with an electromechanical system. Motors are integrated into the support rollers to provide active control capability, substituting the need for complex mechanical damping mechanisms with controlled electromagnetic drive systems that can precisely adjust rotation speed to counteract oscillations.
Solution Approach 2:
The patent changes the operational parameters of support rollers from fixed free-rotation to controlled variable-speed rotation. By dynamically adjusting the rotation speed parameter of support rollers based on detected cable oscillations, the system actively dampens pumping phenomena while maintaining the basic roller structure, thus balancing manufacturing simplicity with oscillation control effectiveness.
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 method provides direct control over cable oscillations, improving passenger comfort and safety by effectively reducing the amplitude of pumping oscillations and preventing mechanical fatigue, thus enhancing the reliability and acceptability of cable transport systems for various uses.
Implementation Method 1
generating a signal representing the translation speed of the mobile cable at an intermediate support of the line of the installation by measuring the free rotation speed of a support roller with which the cable is in adherent contact
Implementation Method 2
correcting by accelerating or braking the rotation speed of the support roller of the intermediate support by clutching a motor or braking device on its axis
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
Method of controlling (300) the line oscillations of a cable vehicle transport installation, the method comprising a step of generating a reference setpoint (33) from real-time measurements on the drive pulley and the supports of the intermediate supports, a closed-loop comparison step between the setpoint (33) and a measurement (39) of the control variable on which the control device (22) acts directly or indirectly, a step of correcting the setpoint (33) by a controller (36), and a step of modifying the rotational speed of at least one roller (21) in adherent contact with the cable (1), according to a control (37) combined with a threshold (VS) and by temporary coupling of a motor or brake block, in order to reduce speed and voltage disturbances and thus control the oscillations of the cable line.