[雙語(yǔ)翻譯]plc外文翻譯--plc變頻控制的水泵系統(tǒng)

1、2300 英文單詞， 英文單詞，11500 英文字符，中文 英文字符，中文 3500 字文獻(xiàn)出處： 文獻(xiàn)出處：Ali A, AL-Soud M, Abdallah E A S. Water pumping system with PLC and frequency control[J]. Jordan Journal of Mechanical and Industrial Engineering ,2009,3（3）:216-221W

2、ater Pumping System with PLC and Frequency ControlAkayleh Ali, Mohammed Al_Soud, Essam Abdallah, Salah AddallahAbstractIn this study controlled water pumping system is designed, constructed, and modeled. The programming

3、method of control of pumping flow rate is achieved by means of integrated programmable logic controller (PLC) and frequency inverter (FI). PLC main function is to determine the required flow rate levels and the related t

4、ime intervals of the flow rate hold time. (FI) is used to control the dynamic change of temperature between various operating points. The designed system shows the capability for full control of pumping flow rate from ze

5、ro to maximum for any required range of time in case of increasing or decreasing the pumping flow rate. All variables of the system will be changed gradually until reaching their needed working points. The mathematical m

6、odel of water pumping system with PLC and frequency control is built based on MATLAB- SIMULINK . A test rig built and an experimental study was performed. From the analysis of the experimental starting dynamic characteri

7、stics of water pumping system and modeled characteristics, it was noticed that they are very similar.Keywords: PLC; Frequency Control; Water Pumping System; Dynamic Characteristics.1. IntroductionPumping equipments in th

8、e modern manufacturing systems may be used as main parts in many industrial activities, like chemical industries, food industries, etc. The automation of the pumping processes in those industries will certainly lead to i

9、mprove their performance [1].In Jordan about 18% of generated electrical power is consumed by three-phase-induction motors driven centrifugal pump in water pumping stations. From the analysis of the working conditions of

10、 water pumping systems, it is noticed that there are many problems, which face the work of such systems, as hydraulic hammers, dynamic stresses in mechanical parts, high starting currents in the there-phase -motor driven

11、 centrifugal pump, and energy saving problems [2].A new single-switch parallel resonant converter for induction heating was introduced in [3].The circuit consists of an input LC-filter, a bridge rectifier, and only one

12、controlled power switch. The switch operates in a soft communication mode and serves as a high frequency generator. A voltage-fed resonant LCL inverter with phase shift control was presented in [4].It was observed that t

13、he control strategy offered advantages in the megahertz operating region, where a constant switching frequency is required. The inverter steady state operation is analyzed using fundamental frequency analyses. A cost-e

14、ffective high efficiency inverter with phase–shifted pulse modulation scheme was proposed for medium power(5-30) kW induction heating applications is discussed in [5]. The proposed inverter accomplishes soft switchi

15、ng operation over a wide power regulation range. The actual power conversion efficiency reached was 96.7%.A control method of reducing the size of the dc-link capacitors of a converter-inverter system was presented in [6

16、]. The main idea is to utilize the inverter operation status in the current control of the converter. This control strategy is effective in regulating the dc-voltage level.speed 2900 rpm. P connects the upper and lower

17、tanks with 0.5 inch steel pipes to provide an unlimited water supply for the system. TV is a throttling value which could be used for varying the flow rate manually. A venture meter was used to measure water flow rate, a

18、nd a stop watch was used to measure the time. The rotational speed of the pump impeller was calculated using the following proportionality equation:Qa/Qr =na/ nr (1)Where:Qa: The actual flow rate of water. Qr : The rated

19、 flow rate of water. na : The actual speed of motor. nr : The raten speed of motor.To investigate the system performance during starting towards different input signals, the frequency control laws which represent the fr

20、equency function of time, shown in Figure 2, were used. The control laws were started from the base frequency of 10 Hz through the starting time to reach reference frequency of 50 Hz. In case of direct connection to the

21、supply network, the starting time equals zero as shown in curve 1 of figure 2, which represents step signal [11].Figure 2. The programmed input frequency of time in case of startingThe curves 2, 3 and 4 in Figure 2, wher

22、e obtained by using different ramp signals with starting time equal to 2 seconds, 3 seconds, and 4 seconds respectively. According to the different inserted control laws, the output flow rate of the water pumping system