Research of the Forklift Power-Assisted Steering System Based on Safety Steering Speed Control

He, Yong; Xiao, Biao

doi:10.21307/ijssis-2017-781

Cited by 7 publications

(12 citation statements)

References 18 publications

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“…In order to represent a process, the following definitions are presented.  and event 1  , 1 str and 2 str construct a parallel structure. And 1 str and 2 str are called parallel sequences (also called parallel branches).…”

Section: Event Sequence and Process Of A Desmentioning

confidence: 99%

“…And 1 str and 2 str are called parallel sequences (also called parallel branches). The whole activity of two strings could be represented by the AND operation: 1 str || 2 str , in which the operator '||' means AND. And the result of the operation is both 1 str and 2 str .…”

Section: Event Sequence and Process Of A Desmentioning

confidence: 99%

“…The whole activity of two strings could be represented by the AND operation: 1 str || 2 str , in which the operator '||' means AND. And the result of the operation is both 1 str and 2 str . Definition 4: (catenation operation and extended structure)…”

Section: Event Sequence and Process Of A Desmentioning

confidence: 99%

“…But the implication of those symbols may be extended to the multi-threads situation. (1) 1 L represents a single thread process with two alternative sequences.…”

Section: B Controllability Of a Languagementioning

confidence: 99%

“…In DES, however, a state has duration in time and different states transit to others with the happening of events. A practical manufacturing system often contains many sensors and actuators, which make the system complex [1][2][3]. Manufacturing system is a kind of DES.…”

Section: Introductionmentioning

confidence: 99%

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Modeling and Optimal Supervision of Multi Sensors and Multi-States Discrete-Event Systems with Structured Languages

2016

International Journal on Smart Sensing and Intelligent Systems

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Abstract-In a discrete-event system, more than one sensor will create more than one event. Several events may happen at the same time parallelly. Events in different parallel branches are irrelevant and it will lead states explosions if mixing them together and enumerating all possible arrangements. A system with parallel sequences has multi-threads and can be dealt with as a whole. In this paper, after analyzing the process of discrete-event systems, the new model is established as a 5-tuple set, which is called a generator with multi-threads. The new generator will generate structured languages which are in accordance with the sequences of the process. The controllability of the structured languages is defined and the theorem about the existence of the supervisor for given languages is presented and proved. For given specifications, the method to solve the supervisor is presented. With the new model, the states of the total system will not explode when two or more systems synchronizing. From two examples shown in Section VI, the new model and supervisor theory for multi-sensors and multi-states discrete-event system are more convenient and natural than that of the traditional theories.

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Section: Event Sequence and Process Of A Desmentioning

confidence: 99%

Section: Event Sequence and Process Of A Desmentioning

confidence: 99%

Section: Event Sequence and Process Of A Desmentioning

confidence: 99%

“…But the implication of those symbols may be extended to the multi-threads situation. (1) 1 L represents a single thread process with two alternative sequences.…”

Section: B Controllability Of a Languagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modeling and Optimal Supervision of Multi Sensors and Multi-States Discrete-Event Systems with Structured Languages

2016

International Journal on Smart Sensing and Intelligent Systems

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Electric Power Steering System Control Strategy Based on Robust H∞ Control for Electric Forklift

Jiang

Xiao

2018

Mathematical Problems in Engineering

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The dynamic model of the Electric Power Steering (EPS) system for electric forklifts and the two-degree-of-freedom (2DOF) forklift models has been established. Based on the control target of electric forklift EPS, a generalized EPS control model with model perturbation and interference is established. The standard H∞control model of the EPS system is transformed, and the EPS generalized state equation of electric forklift is derived. The principle of robust control with genetic optimization is expounded, aiming at the parameters optimization of the weighted function of H∞control model, the constraint function of the genetic algorithm (GA) is constructed, and the robust controller of genetic optimization is derived. Taking the electric forklift TFC20 as the research object, according to the actual data on the forklift, the system model is established in MATLAB, and the effects of PID control, robust control, and genetic robust control are compared, the results show that the power steering characteristic of the robust control is better than the power steering characteristic of the PID control, and the stability of the forklift under the control of robust control is better. Also, the power steering characteristic of the H∞ controller with GA optimization is better than that of an unoptimized one, and its robustness is better, under external pavement interference, the following ability is stronger for the ideal current and the steering is more stable.

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Modelling of Equipment Failure Rate Accounting for the Uncertainty

Tian

Wen

Wang

et al. 2015

International Journal on Smart Sensing and Intelligent Systems

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A fuzzy model for failure rate with the consideration of the effects of uncertain factors in distribution reliability evaluation is presented. The possibility and credibility distribution analyzed on the basis of sample datum are used for quantifying effects of the uncertainty done to failure rate.Mathematically, the failure rate can be obtained in the interval integration. Moreover, aiming to make the calculating quantity of system reliability evaluation simple and easy, the fuzzy clustering analysis of equipment is adopted. The technique proposed has been implemented in an example distribution system for illustration and the results obtained have been compared with those obtained with average model.

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Research of the Forklift Power-Assisted Steering System Based on Safety Steering Speed Control

Cited by 7 publications

References 18 publications

Modeling and Optimal Supervision of Multi Sensors and Multi-States Discrete-Event Systems with Structured Languages

Modeling and Optimal Supervision of Multi Sensors and Multi-States Discrete-Event Systems with Structured Languages

Electric Power Steering System Control Strategy Based on Robust H∞ Control for Electric Forklift

Modelling of Equipment Failure Rate Accounting for the Uncertainty

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