Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Elevator

Modeling and Simulation of Telescopic Hydraulic for Elevating Purposes

Istabraq H. Abed Al-Hady; Farag M. Mohammed; Jamal A.K. Mohammed

Engineering and Technology Journal, 2022, Volume 40, Issue 1, Pages 226-232
DOI: 10.30684/etj.v40i1.2253

The hydraulic cylinder is widely used in industry as the load lifting structures. A telescopic hydraulic cylinder is a special design of a cylinder with a series of gradually smaller diameter tubes overlapping each other. Three-stage telescopic cylinder performance analysis is performed with the help of the Finite Element Method. Also, MATLAB Simulink is used to create a complete design of the dynamic model of the telescopic cylinder. The analysis results of characteristic curves for telescopic cylinder position, velocity, and acceleration show the simulation model's accuracy and plausibility. This package will provide a basic reference for analyzing and designing the hydraulic cylinders with any number of stages. Simulation results show that a sudden change of pressure upon phase change will lead to multi-phase vibration.

Performance Improvement of a Conventional Hydraulic Elevator by Using Electro-Hydraulic Servo Mechanism

Jamal AK. Mohammed; Walaa M. Hashim; Bahaa S. Beram

Engineering and Technology Journal, 2020, Volume 38, Issue 5, Pages 748-760
DOI: 10.30684/etj.v38i5A.367

An electro-hydraulic elevator is a new type of enhanced elevators that are used in low-rise buildings that do not exceed more than three floors. In this paper, an electro-hydraulic servo system for controlling the speed of a hydraulic elevator prototype by using a proportional valve and PID controller was investigated theoretically and experimentally. A three floors elevator prototype model with 76cm height was built including hydraulics components and electrical components. The elevator system is fully automated using the Arduino UNO board based Data Acquisition (DAQ) system. LabVIEW software is used to control the hydraulic elevator system through L298 DC drive via the DAQ board. The best PID gains was obtained experimentally. The elevator system prototype could be emplimented for educational purposes; such as learning the undergraduate students in the Electromechanical Engineering Department in the University of Technology how to structuring the electro-hydraulic elevator as well as the appropriate control strategy.

Modeling of DC Elevator Motor Drive forMid-rise Building

Jamal A. Mohammed; Ahlam L. Shuraiji

Engineering and Technology Journal, 2013, Volume 31, Issue 12, Pages 2320-2342

An elevator is a platform, either open or enclosed, used for lifting people or
freight to upper floors within a building. Elevators are a standard part of any tall
commercial or residential building. Mid speed elevators are commonly used in
various mid-rise buildings today.
In this paper, a new type of gear traction machine drive system with a
permanent-magnet (PM) DC motor for mid-rise and mid-speed elevators is
presented. This application of PM motor to the elevator traction machine enables
several improvements including higher efficiency, greater ride comfort, and
miniaturization and so on.
The ideal elevator drive at larger horsepower levels should have efficient
power conversion, regeneration, low harmonic distortion, and near unity power
factor at the utility power lines. Therefore, voltage-fed 3-phase PWM rectifier is
adopted so that DC bus voltage regulation, bi-directional power flow and
controllable power factor with reduced input current harmonics are possible.