Turntable Speed Control for Unfolded Boom Stability
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Solution Overview
Problem
Existing aerial work platforms experience operator dizziness and reduced efficiency due to fixed rotational angular velocities during boom unfolding and elongation, leading to instability and prolonged operation times.
Innovation Solution
A system and method for controlling the rotation speed of a turntable based on varying angular velocities according to boom luffing angle and elongation length, using sensors and actuators to adjust rotational speed dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotational angular velocity is set to high speed when the boom is in the unfolded state, then the rotation efficiency of the turntable is improved, but the operator experiences dizziness and the impact of rotary braking increases
Solution Approach 1:
The patent applies dynamics by making the rotational angular velocity variable rather than fixed. The control system dynamically adjusts the rotational speed based on real-time boom state detection, switching between high speed (when boom is stowed) and low speed (when boom is unfolded), thereby optimizing rotation efficiency while preventing operator dizziness and excessive braking impact
Solution Approach 2:
The patent implements feedback through detection devices that monitor the boom's luffing angle and elongation length. This feedback information is fed to the control system, which then adjusts the rotational angular velocity accordingly, creating a closed-loop control mechanism that balances productivity and operator comfort
2Object-affected harmful factors
If the rotational angular velocity is set to low speed when the boom is in the unfolded state, then the operator comfort is improved, but the rotation efficiency of the turntable decreases and operation time increases
Solution Approach 1:
The system dynamically adjusts rotational speed based on boom configuration. When the boom is stowed, high speed rotation is permitted to minimize operation time. When the boom is unfolded, speed reduces to ensure operator comfort. This dynamic adjustment resolves the contradiction by adapting speed to operational context
Solution Approach 2:
The patent changes the parameter of rotational angular velocity based on boom state parameters (luffing angle and elongation length). By establishing threshold values for these parameters, the system automatically switches between high and low speed modes, optimizing both operation time and operator comfort
Data Source
Figure 1~2
AI summary
Provided are a method and system for controlling a rotation speed of a turntable and an aerial work platform. The method includes the following: When a boom is in the unfolded state, the rotational angular velocity ω of the turntable is equal to ω0-k1(α-α0) when the luffing angle α of the boom is greater than or equal to α0 and the length L of the boom is less than L0. α0 is a set constant of the luffing angle of the boom, L0 is a set constant of the length of the boom, and k1 is an angular velocity coefficient for luffing control of the boom. The rotational angular velocity ω of the turntable is equal to ω0-k2(L-L0) when the luffing angle α of the boom is less than α0 and the length L of the boom is greater than or equal to L0. k2 is an angular velocity coefficient for elongation control of the boom. The rotational angular velocity ω of the turntable is equal to MIN{ω0-k1(α-α0), ω0-k2(L-L0)} when the luffing angle α of the boom is greater than or equal to α0 and the length L of the boom is greater than or equal to L0.