有关静力压桩机的英文文献

Fig.4.
Instant torque arithmetic circuit composition figure
v a ( t ) = E m sin ω t 2 v b ( t ) = E m sin ω t − π 3 4 v c ( t ) = E m sin ω t − π 3 v a (t ) = Ri a (t ) + P ψ a (t ) v b (t ) = Ri b (t ) + P ψ b (t ) v c (t ) = Ri c (t ) + P ψ c (t )
K = mrg
(1)
Fig.2. Rotation of eccentric heavy bob and the direction of centrifugal force
III.

A CALCULATION OF INSTANTANEOUS TORQUE
Here, each instantaneous value of the current of an induction motor, magnetic flux, and torque is derived. Creation and a simulation are performed for the operation composition circuit diagram for instantaneous torque derivation using MATLAB/Simulaink. A. Deriving of each instantaneous value Current and magnetic flux are derived from each phase voltage of the stator winding of three-phase induction motor as shown in an equation (2) from the voltage equation of an equation (3). When derived current and flux are converted into coordinate system at rest, it becomes like expression (4) and (5).
Abstract--The aim of this paper in to clarify the instantaneous torque of induction motor used in a vibratory pile driver. This paper explains two things. In the first place, the principle of operation of a vibratory pile driver is explained. In the second place, derivation and examination of induction motor of an instantaneous torqe type are explaned. In conclusion, the principle of a vibratory pile driver of operation and derivation the instantaneous torqe of induction motor used a vibratory pile driver were explained. Index Terms—vibratory pile driver, heavy bob, induction motor, instantaneous torque
i α (t ) = iβ (t ) = 3 ia (t ) 2 1 ia (t ) + 2
3 ψ a (t ) 2 1 ψ a (t ) + 2
(2)
B. Simulation The simulation of instantaneous torque is performed from the instantaneous torque arithmetic circuit composition figure of Fig.4 created using MATLAB/Simulink. The induction motor of Table 1 is used for the target induction motor. A simulation result is shown in Fig.5.
TABLE 1 The rating of the induction motor constant value Outputs power [kw] 240 pole 6 Voltage [V] 440 Current [A] 403 Frequency [Hz] 60
(3)
・m) Instantaneous torque (kN
Fig.1. Heavy bob
I. INTRODUCTION The vibratory pile driver which drives a stake into the foundation in engineering works and construction work is used. The advantage of the vibratory pile driver is high the driving speed, and excellent in the workbility and the economy. Moreover, the crane and the ship might be used, the movement degree of freedom is high, and the work efficiecy is good. As for the motor used forthe vibratory pile driver, the motor and the oil pressure motor are used. A motor is advantageous in that the cost of construction is low, but vibration is big. Therefore an induction motor is used for a motor. To become a problem here is not to understand the situation of driving vibratory pile driver. This is because the sensors are not installed so that vibratory pile driver vibrates. The movement characteristics such as vibration of vibratory pile driver, vibratory force are decided by weight and number of revolution of heavy bob to show in Figure 1. The number of revolutions of heavy bob is fixed by slip and angular velocity of induction motor. Since presumption of instant toruqe is possible for an induction motor, from instant torque, angular verocity are drown and operation of A when changing load is considered. In this parer, explantion about the principle of operation of vibratory pile driver was given instant torque was deriverd, and each many origin of vibratory pile driver was explend. Moreover, it inquired by performing a simulation using MATLAB/Simulink.
Calculation the Instantaneous Torque of Induction Motor Used a Vibratory Pile Driver
Ryouichi Aota *, Hideo Dohmeki*
* Department of Electrical and Electronic Engineering, Tokyo City University, Tokyo, Japan
II.
OPERATING PRINCIPLE OF THE VIBRATORY PILE DRIVER
Heavy bob shown Figure 1 is arranged symmetrically. The centrifugal force is generated because heavy bob rotates. The eccentric moment K is shown in expression (1), and show the state in Fig.2. Fig.2 from heavy bob to rotate opposite each other at equal speed, the force cancels each horizontal, vertical direction only works force. As a result, the up-and-down oscillation is generated. An induction motor serves as the rotational source of power. A gear is used for the shaft of an induction motor, heavy bob symmetrically arranged through a belt pulley and belt are rotated, and the above-mentioned operation is enabled. Here, since the induction motor is used, rotation at same speed is mechanically attained by a belt pulley using a slip.