Determination of Flow Rate Characteristics for Pneumatic Components During Isothermal Discharge by Integral Algorithm

2012 ◽  
Vol 134 (6) ◽  
Author(s):  
Tao Wang ◽  
Ling Zhao ◽  
Tong Zhao ◽  
Wei Fan ◽  
Toshiharu Kagawa
Keyword(s):  
Flow Rate ◽  
Pressure Sensors ◽  
Pressure Response ◽  
Experimental Result ◽  
Rate Characteristic ◽  
Flow Rate Characteristic ◽  
Discharge Method ◽  
Measured Pressure ◽  
Error Method

In this paper, we proposed a method to determine the flow rate characteristic parameters directly by using an integral algorithm which is not needed to calculate the flow rate. In the isothermal discharge method discussed by ISO, the flow rate characteristics of pneumatic components can be obtained by pressure response and flow rate. The pressure response is measured in an isothermal tank and the flow rate can be given by differentiating the measured pressure response. Because of using the differential algorithm, calculation precision for measurement error and distribution is much poorer. By integrating pressure experimental result with least error method, characteristics can be obtained easily with Excel tool. Some experimental results are given to show that the proposed calculation method in this paper is more effective than the conversational method by using pressure sensors with different precision.

Servo Valve Nozzle Fuzzy Clustering Analysis Pairing Algorithm

2015 ◽  
Vol 667 ◽  
pp. 476-480
Author(s):  
Xu Dong Pan ◽  
Wen Dong Zhu ◽  
Guang Lin Wang
Keyword(s):  
Flow Rate ◽  
Clustering Analysis ◽  
Characteristic Curve ◽  
Orifice Diameter ◽  
Servo Valve ◽  
Fuzzy Clustering Analysis ◽  
Direct Measurements ◽  
Rate Characteristic ◽  
Hydraulic Servo ◽  
Flow Rate Characteristic

Electro-hydraulic servo valve is the key component of an electro-hydraulic servo control system, and double nozzle flapper valve is the main type of electro-hydraulic servo valve. Nozzles are the important part of a double nozzle flapper valve, the pairing quality is directly related to the performance of the servo valve .Servo valve is of symmetrical structure, and the use of nozzles is also in pairs. The process of nozzles matched in pairs is called pairing process. Because the orifice diameter of the nozzle is only about 0.2 to 0.3 mm, it is difficult to pair with the method of direct measurements. Besides, as a kind of hydraulic components, nozzles are usually paired by flow rate measured under differential pressure. Two nozzles will be matched to a pair if their pressure-flow rate characteristic curve is within the allowed tolerance. To ensure the success rate of pairing, it usually needs a large number of machined nozzles to be sifted. According to the principle of clustering analysis, we propose a new paring algorithm which can match nozzles efficiently and automatically.

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