86 research outputs found
AI and IoT Meet Mobile Machines: Towards a Smart Working Site
Infrastructure construction is society's cornerstone and economics' catalyst. Therefore, improving mobile machinery's efficiency and reducing their cost of use have enormous economic benefits in the vast and growing construction market. In this thesis, I envision a novel concept smart working site to increase productivity through fleet management from multiple aspects and with Artificial Intelligence (AI) and Internet of Things (IoT)
AI and IoT Meet Mobile Machines
Infrastructure construction is society's cornerstone and economics' catalyst. Therefore, improving mobile machinery's efficiency and reducing their cost of use have enormous economic benefits in the vast and growing construction market. In this thesis, I envision a novel concept smart working site to increase productivity through fleet management from multiple aspects and with Artificial Intelligence (AI) and Internet of Things (IoT)
Optimization of Operation Strategy for Primary Torque based hydrostatic Drivetrain using Artificial Intelligence
A new primary torque control concept for hydrostatics mobile machines was
introduced in 2018. The mentioned concept controls the pressure in a closed
circuit by changing the angle of the hydraulic pump to achieve the desired
pressure based on a feedback system. Thanks to this concept, a series of
advantages are expected. However, while working in a Y cycle, the primary
torque-controlled wheel loader has worse performance in efficiency compared to
secondary controlled earthmover due to lack of recuperation ability.
Alternatively, we use deep learning algorithms to improve machines'
regeneration performance. In this paper, we firstly make a potential analysis
to show the benefit by utilizing the regeneration process, followed by
proposing a series of CRDNNs, which combine CNN, RNN, and DNN, to precisely
detect Y cycles. Compared to existing algorithms, the CRDNN with bi-directional
LSTMs has the best accuracy, and the CRDNN with LSTMs has a comparable
performance but much fewer training parameters. Based on our dataset including
119 truck loading cycles, our best neural network shows a 98.2% test accuracy.
Therefore, even with a simple regeneration process, our algorithm can improve
the holistic efficiency of mobile machines up to 9% during Y cycle processes if
primary torque concept is used.Comment: 9 pages, 23 figure
A Novel Algorithm for Hydrostatic-Mechanical Mobile Machines with a Dual-Clutch Transmission
Mobile machines using a hydrostatic transmission is highly efficient under lower working-speed condition but less capable at higher transport velocities. To enhance overall efficiency, we have improved the powertrain design by combining a hydrostatic transmission with a dual-clutch transmission (DCT). Compared with other mechanical gearboxes, the DCT avoids the interruption of torque transmission in the process of shifting without sacrificing more transmission efficiency. However, there are some problems of unstable torque transmission during the shifting process, and an excessive torque drop occurring at the end of the gear shift, which result in a poor drive comfort. To enhance the performance of the novel structural possibility of powertrain design, we designed a novel control strategy, which maintains the sliding in the torque phase and reduces the difference before and after the engagement, for the motor torque and the clutch torques during the shifting process, and then validated the control effect with model-based simulation. As a result, the control strategy employing clutch and motor torque control achieve a smooth shifting process since the drive torque is well tracked, and highly dynamical actuators are not required. As another benefit, only two calibration parameters are designed and actually needed to adjust the control performance systematically, even for any different sizes machines. Our research indicates the possibility to adopt dual-clutch in the field of construction machines
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