附件24.3 Problems from 《ydraulic and Pneumatic Transmission》 S M Chen,Fuzhou University,P.R.China Chapter 1 1-1 What are the differences and similarities among hydraulic pressure transmission,pneumatic pressure 1-2 How many parts does a hydraulic or pneumatic pressure transmission system consist of?What are they and what are their functions? 1-3 There are two significant features and two basic parameters in hydraulic or pneumatic pressure transmission eration.What are they? 1-4 How to build a circuit of hydraulic system? Chapter 2 2-1 A hydraulic cylinder has a volume of 50L at the atmospheric pressure,as the pressure increases the volume decreases to 9L what is the rising value of the pressure?The hydraulic ol bulk elastic modulek is 7000x103pg 2-Ahydraulic il (m)having a mass density/mis flowing for 155s tested by Engler viscometer.The same volume of water flows through it for 51s at 20C.What are the E of this hydraulic oi,the dynamic viscosity(Pas).and the kinematic viscosity v(s)? 2-3.What is the e p on the ear drums ofa scuba diver when he is1m below the surface of the ocean Salt water density/m 2-4.A hydraulic oil having a mass density of 1x10(1b-see'lin)is flowing through an orifice 6.35x10m in diameter at a rate of 21.3L/min.The orifice coefficient c is 0.80.What is the pressure ic system reservoir contains oil with a volume of 17L.The initial oil level a 2.54cm diameter drain hole.If the drain were opened,and if the oil were assumed frictionless,how quickly would the tank drain? 2-6.A reservoir is 0.6m in diameter.If oil is flowing into the reservoir at a rate of 13.25L/min and drawn out at arate of 7.57L/min,how rapidly is theoi level rising? 2-7.An oil having a mass density of 9x10(1b-sec"/in)is flowing around a=45bend in a 1.9cm tube having 0.09cm walls at a rate of g=56.78L/min.What are the forces F on the tube? 2-8 A container with a certain vacuum degree is located inversely in a groove(open to the atmosphere) through a tube,with an oil rising lever of 5m in the tube.If the density of the oil is 1000kg/mwhat is the vacuum degree in the container? 附件 24.3 Problems from 《Hydraulic and Pneumatic Transmission》 S M Chen, Fuzhou University, P.R.China Chapter 1 1-1 What are the differences and similarities among hydraulic pressure transmission, pneumatic pressure transmission and electrical towage? 1-2 How many parts does a hydraulic or pneumatic pressure transmission system consist of? What are they and what are their functions? 1-3 There are two significant features and two basic parameters in hydraulic or pneumatic pressure transmission operation. What are they? 1-4 How to build a circuit of hydraulic system? Chapter 2 2-1 A hydraulic cylinder has a volume of 50L at the atmospheric pressure, as the pressure increases the volume decreases to 49.9L, what is the rising value of the pressure? The hydraulic oil bulk elastic module k is 7000×105 Pa. 2-2 A hydraulic oil (200mL) having a mass density of 850 kg/m3 is flowing through an orifice for 155s tested by Engler viscometer. The same volume of water flows through it for 51s at 20℃.What are the E 0 of this hydraulic oil, the dynamic viscosityγ ⋅sPa )( , and the kinematic viscosity )/( 2 ν sm ? 2-3. What is the pressure on the ear drums of a scuba diver when he is 18m below the surface of the ocean? Salt water density is 960kg/m3 . 2-4. A hydraulic oil having a mass density of (1b-sec 4 101 − × 2 /in4 ) is flowing through an orifice 6.35×10-4m in diameter at a rate of 21.3L/min. The orifice coefficient c is 0.80. What is the pressure differential across the orifice? 2-5. A hydraulic system reservoir contains oil with a volume of 170L. The initial oil level is 0.9m above a 2.54cm diameter drain hole. If the drain were opened, and if the oil were assumed frictionless, how quickly would the tank drain? 2-6. A reservoir is 0.6m in diameter. If oil is flowing into the reservoir at a rate of 13.25L/min and drawn out at a rate of 7.57L/min, how rapidly is the oil level rising? 2-7. An oil having a mass density of (1b-sec 5 109 − × 2 /in4 ) is flowing around a bend in a 1.9cm tube having 0.09cm walls at a rate of q=56.78L/min. What are the forces F on the tube? 0 θ = 45 2-8 A container with a certain vacuum degree is located inversely in a groove (open to the atmosphere) through a tube, with an oil rising lever of 0.5m in the tube. If the density of the oil is 1000kg/m3 , what is the vacuum degree in the container?