Abstract:An anti-roll hydraulic cylinder is designed as an executive mechanism of the lateral stability control to provide lateral support force on the basis of an analysis of the structure of the forklift and the mechanism of lateral instability. A lateral stability layered control method based on Takagi–Sugeno (T–S) fuzzy neural network is proposed, divides the forklift lateral stability control into the upper identification layer, the middle control layer and the lower executive layer. Simulation and real vehicle te… Show more
“…Owing to the unique structure of a forklift and its low-speed and heavy-duty operating conditions compared with traditional road vehicles, this study adopts the anti-rollover support cylinder and full hydraulic active steering as the control system's actuator. 6 The anti-rollover support cylinder is a double-acting double-piston rod hydraulic cylinder. Both ends of the locking cylinder are hinged with the body and the rear axle, the upper and lower cavities are connected, and the external connecting oil circuit is provided with a locking solenoid valve.…”
Section: Anti-rollover Actuator Of the Counterbalance Forkliftmentioning
confidence: 99%
“…The relevant literature has indicated that when a forklift truck is empty and the position of the body centroid is backward, the forklift driving safety threshold is the minimum. 6 Therefore, the current study uses the most dangerous no-load condition for test and simulation.Figure 11.Schematic of European standard runway for forklift stability.…”
Section: Simulation Verification and Analysismentioning
confidence: 99%
“…5 Xia et al proposed an anti-rollover hierarchical control method based on the Takagi-Sugeno fuzzy neural network, which used neural network to judge the movement state of the forklift and took the lateral load transfer rate (LTR) as the index to control. 6 Kasahara et al studied the influence of the change of the center of gravity position on the rollover of the forklift and designed an experimental model with measurable center of gravity to study the lateral stability of the forklift when turning by calculating the LTR. 7 In recent years, numerous in-depth studies have been conducted on the lateral stability and anti-rollover control of passenger and heavy vehicles.…”
Section: Introductionmentioning
confidence: 99%
“…Owing to the unique structure of a forklift and its low-speed and heavy-duty operating conditions compared with traditional road vehicles, this study adopts the anti-rollover support cylinder and full hydraulic active steering as the control system’s actuator. 6…”
This study proposes an energy stability index suitable for a counterbalance forklift, aiming to solve the problem that the traditional vehicle stability index load transfer rate is difficult to accurately judge the stability state of such a forklift. The analysis of the structure of the counterbalance forklift and contact relationship between the body and rear axle are used as bases to establish a two-stage dynamic model and derive real-time instability energy of a forklift truck in the rollover process under different conditions. Additionally, this research proposes an anti-rollover control strategy of the counterbalance forklift based on roll energy classification. The corresponding calculation formula of the forklift energy stability index is selected according to different stability conditions to perform roll energy classification. An anti-rollover oil cylinder and active rear wheel steering are used as an anti-rollover control actuator, and an anti-rollover control is implemented based on model predictive control. Last, a simulation based on European standard operating conditions and real vehicle test verification is conducted. Results show that the anti-rollover control strategy based on roll energy classification can effectively reduce the risk of forklift rollover and improve the stability and active safety of a counterbalance forklift.
“…Owing to the unique structure of a forklift and its low-speed and heavy-duty operating conditions compared with traditional road vehicles, this study adopts the anti-rollover support cylinder and full hydraulic active steering as the control system's actuator. 6 The anti-rollover support cylinder is a double-acting double-piston rod hydraulic cylinder. Both ends of the locking cylinder are hinged with the body and the rear axle, the upper and lower cavities are connected, and the external connecting oil circuit is provided with a locking solenoid valve.…”
Section: Anti-rollover Actuator Of the Counterbalance Forkliftmentioning
confidence: 99%
“…The relevant literature has indicated that when a forklift truck is empty and the position of the body centroid is backward, the forklift driving safety threshold is the minimum. 6 Therefore, the current study uses the most dangerous no-load condition for test and simulation.Figure 11.Schematic of European standard runway for forklift stability.…”
Section: Simulation Verification and Analysismentioning
confidence: 99%
“…5 Xia et al proposed an anti-rollover hierarchical control method based on the Takagi-Sugeno fuzzy neural network, which used neural network to judge the movement state of the forklift and took the lateral load transfer rate (LTR) as the index to control. 6 Kasahara et al studied the influence of the change of the center of gravity position on the rollover of the forklift and designed an experimental model with measurable center of gravity to study the lateral stability of the forklift when turning by calculating the LTR. 7 In recent years, numerous in-depth studies have been conducted on the lateral stability and anti-rollover control of passenger and heavy vehicles.…”
Section: Introductionmentioning
confidence: 99%
“…Owing to the unique structure of a forklift and its low-speed and heavy-duty operating conditions compared with traditional road vehicles, this study adopts the anti-rollover support cylinder and full hydraulic active steering as the control system’s actuator. 6…”
This study proposes an energy stability index suitable for a counterbalance forklift, aiming to solve the problem that the traditional vehicle stability index load transfer rate is difficult to accurately judge the stability state of such a forklift. The analysis of the structure of the counterbalance forklift and contact relationship between the body and rear axle are used as bases to establish a two-stage dynamic model and derive real-time instability energy of a forklift truck in the rollover process under different conditions. Additionally, this research proposes an anti-rollover control strategy of the counterbalance forklift based on roll energy classification. The corresponding calculation formula of the forklift energy stability index is selected according to different stability conditions to perform roll energy classification. An anti-rollover oil cylinder and active rear wheel steering are used as an anti-rollover control actuator, and an anti-rollover control is implemented based on model predictive control. Last, a simulation based on European standard operating conditions and real vehicle test verification is conducted. Results show that the anti-rollover control strategy based on roll energy classification can effectively reduce the risk of forklift rollover and improve the stability and active safety of a counterbalance forklift.
“…Papers published so far such as [22][23][24][25][26][27][28], explicitly deal with fork or whole forklift damage. In contrast, this paper is about understanding the mechanism of load damage on the forks of a forklift, which requires studying the individual nature of the forklift movement.…”
Section: Mechanism Of Load Damage Occurrencementioning
A large number of processes for transporting and handling palletized goods using a forklift in logistics centers is usually associated with an increase in pallet and load damage. Therefore, first of all, the “damage mechanism” was identified. A classic “state of the art” analysis was conducted. The paper presents the essence of the authors’ hybrid idea of:—locking the load;—while increasing the coefficient of friction between the pallet and the forks of the forklift; but so as not to compromise on the existing functionality of the forklift forks. The idea turned out to be an innovation that required intellectual property protection, hence it was not only described in a paper but also patented. It is about an extra element that is not standard on forklifts—a forklift fork attachment. The paper discusses mechanical damage to loads involving a forklift, load damage test results, anti-slip forklift attachment, computational model of the attachment, prototype, and real-world testing of the attachment on a forklift in a logistics center. Design data from the FEM calculation system, photos of:—the prototype with components,—the prototype on tests in the logistics center were made available. The paper concludes with a pallet and load damage study performed at a logistics center and an insulation panel factory. The level of accuracy of the publication is detailed enough that the reader can make the attachment on their own and, using the content of the paper, adapt it to the needs of their own logistics system.
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