1/1/2020 · The concrete setting time and reinforcement conditions are other factors for determining the placement rate. Increasing the pumping rate of SCC can result in a higher loss of pressure compared to traditional concrete. Download : Download full-size image Fig. 3.3.
10/8/2018 · The open displacement (crack width) of the fracture area was measured using a standard KTRC-10.0 linear displacement sensor, as shown in Fig. 6. The peak load F 1 was recorded for each crack. After the crack width reached 400 μm, the tested specimen was unloaded, which resulted in the crack contraction and reduction in the crack width down to approximately 300 μm.
Abstract: To solve the problem of piston striking cylinder and pumping insufficiency, an optimization method of concrete open-loop pumping displacement control is derived and presented. In order to control piston stroke effectively, the optimization model of concrete open-loop pumping displacement control parameters is built based on considering the system's open-loop characteristics.
optimization design, the reliabilities should be imported in the optimization design models [1-3], which is named as reliability based design optimization. There are three algorithms to solve the RBDO problems. The double loop algorithm which nests the reliability
optimal model of concrete pumping displacement control must be built to find the best set of control parameters which is suitable for a wide range of dynamic load. (a) The Schematic diagram
16/8/2019 · Polytechnic University of Madrid, Spain The editor and reviewers' affiliations are the latest provided on their Loop research profiles and may not reflect their situation at the time of review. 1 Politécnico, Universidad San Francisco de Quito, Quito, Ecuador 2 Concrete Structures, Department of Engineering Structures, Civil Engineering and Geosciences, Delft University of Technology, Delft
Nowadays, concrete boom truck in Kenya is widely applicable on sites, especially for large construction projects. As we all know, the boom concrete pump is mounted on truck with long boom for operation. That's also the significant reason why a lot of contractors
piston pump can fully satisfy the requirements of the pumping system in a pump truck, including the control of Electric displacement control, Power control, Pressure compensated control, etc.. l S Valve Swinging System Solution: S45series variable open pumps have integrated
40Z-METER A NEW STANDARD OF INNOVATION AND EXCELLENCE LONG ON REACH, LIGHTWEIGHT IN DESIGN Weighing in under 57,500 lbs. (26,000kg) on it three-axle chassis, Putzmeister's 40Z-Meter offers more reach for less money. Its compact and
In order to control piston stroke effectively, the optimization model of concrete open-loop pumping displacement control parameters is built based on considering the system's open-loop characteristics. Satisfying the physical constraint of preventing piston striking cylinder and maximizing piston's effective stroke are taking as the evaluation
Currently when the domestic concrete pump is pumping, the piston of master cylinder may hit the cylinder or not travel enough displacement; the travelling rules in different conditions have been
1/1/2017 · Sun et al. proposed a closed-loop monitoring and open-loop control method to suppress the boom vibration . Due to the fact that vibration is very important in the dynamics and kinematics analysis of the concrete pump boom, a rigid-flexible method is adopted in this paper to establish an accurate model of the boom.
1/1/2020 · For placement of very large vertical objects, the concrete flow should happen slowly to provide sufficient time and a short distance to the open surface for releasing the air bubbles. A good SCC mixture should push air out by its weight without any vibration.
Chen and Sun studied the structural optimization of concrete pump displacing boom system by using BP neural network, finite element, and genetic algorithms . Zhang et al. established a truck mounted concrete pump simulation model in ADAMS software and studied the force between the cylinder and link joints which provide design guide for such mechanism [ 17 ].
This paper theoretically analyzed the deformation law of the underlying tunnel caused by dewatering and excavation of deep foundation pit in the phreatic aquifer area, which is based on the Mindlin solution and the double-sided elastic foundation beam theory, and used the finite difference method and the fluid-solid coupling principle to conduct three-dimensional numerical simulation of
IN A CLOSED LOOP SYSTEM The pumps at the heart of Putzmeister's free flow pumping system are bi-directional, variable displacement piston pumps. Depending on stroke, oil flows in a closed loop from either port A or port B on the pump to the hydraulic
1/7/2010 · Such systems operate in open-loop speed control because precision and transient performance are not required. In addition, the system operates at steady state for long periods. Various studies have been carried out on sizing ( Hamidat et al., 2003 ), matching ( Salas et al., 2006, Duzat, 2000 ) and optimizing ( Betka et al., 2004, Betka, 2005, Benlarbi et al., 2004 ) PV systems.
1/6/2016 · Therefore, the mismatch between varying loads and systemâ€ s open-loop control property can leads to the problem of pumping insufficiency. Therefore, in order to solve foresaid problem, the optimal model of concrete pumping displacement control must be built to find the best set of control parameters which is suitable for a wide range of dynamic load.
Micropump Displacement 1.00E-05 8.00E-06 displacement (um) 6.00E-06 4.00E-06 Series1 2.00E-06 0.00E Note the low frequency preceding the high frequency fringe sinusoids that is used as a signature for the beginning of the diaphragm displacement; it has a distinct and incomplete cycle transient function, indicating a sudden change in the diaphragm position.
22/3/2021 · According to the actual pumping conditions, the moving speed inside the concrete piston cylinder was 0.8–1.2 m/s, and a certain middle speed was selected as the pumping inlet velocity. Moreover, to make the numerical simulation closer to the actual pumping process, the outlet pressure value was set to 1 MPa.