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Course Name: Robo 241 Hydraulics 3
Section: 002
Lab No.: 03
Lab report must be handed in at the beginning of your next lab class. Any late submission will be deducted 10% each business day.
Student Name: _ _ SONI PRIYANK___
(Last name) (First Name)
Student No. 301242714
Date: 26
th
September, 2022
Instructor: PAUL BLIGDON
ABSTRACT:
This lab test determined how a vane motor works. The concept of motor calculations was also addressed. The RPM and pressures of the motor were measured together with other properties under various situations. OBJECTIVE: The aim of the experiment is to understand function and operation of vane motor. Also, to identify and understand the various components of the hydraulic power unit and the vane motor testing device. Learning how to read pressure and flow, measure motor RPM, and conduct motor-related computations was explored. PROCEDURE:
- The pressure, return, and drain hoses of the hydraulic power unit were first identified, and all of these hoses were then connected to the corresponding ports on the Vane motor test stand. In addition, pressure gauges were installed in the available ports at the motor's input and outflow.
- Switch ON PDP
- Switch ON Hydraulic unit
- The regulator was set to 20 PSI and the air hose from the foot pedal was connected to the air line.
- Before starting the hydraulic power unit, the swash plate was adjusted to provide the maximum flow and the by-pass valve was fully opened. Then, after activating the hydraulic power unit, the bypass valve was gradually closed, and the swash plate was adjusted to limit the pump's output to 12 GPM.
- Connect test setup to output hose of the hydraulic power-pack
- The DCV was turned on and the rotational direction of the motor was recorded by pressing the green button on the Vane motor test stand.
- Readings for flow, motor RPM, and various pressures (without a load) were recorded in the table.
- The brake pedal was pressed again to add some stress during the DCV actuation, and the relevant data were collected. The brakes' air pressure was increased by 2 PSI at a time.
- The same method was used until the motor inlet pressure reached 1000 psi. The air pressure was then increased by 2 PSI increments until the inlet pressure of the motor reached the 1200 PSI relief valve setting. The brake pedal was released every time the air pressure was increased. Calculate the efficiency of the piston pump using both real and hypothetical flow (Q).
- The wheel RPM was measured without applying the brake. For additional calculations, the diameter of the wheel was also measured.
- Switch off the PDP. EQUIPMENT LIST:
- Hydraulic test setup
- Connecting hoses
- Foot Pedal
- Digital flow meter
- Pressure Gauges
OBSERVATION TABLE:
BRAKE AIR PRESSURE (PSI) FLOW INTO VANE MOTOR (GPM) ACTUAL VANE MOTOR SPEED (RPM) VANE MOTOR INLET PRESSURE (PSI) VANE MOTOR OUTLET PRESSURE (PSI) 20 12 1207 340 120 22 11.77 1180 355 120 24 11.70 1170 400 120 26 11.59 1150 550 120 28 11.52 1130 650 120 30 11.45 1080 750 120 91.50% 92.00% 92.50% 93.00% 93.50% 94.00% 94.50% 0 100 200 300 400 500 600 700
Pressure Drop (PSI) Vs Volumetric Efficiency (%)
91.50% 92.00% 92.50% 93.00% 93.50% 94.00% 94.50% 1120 1130 1140 1150 1160 1170 1180 1190 1200 1210 1220
Motor Speed (RPM) Vs Volumetric Efficiency (%)
- State the function of motor speed. A hydraulic motor works by using pressurized fluid to rotate a shaft. This shaft can then be used to move an object or perform tasks.
- State what is meant by the term ‘minimum motor speed’ Where motor produces its lowest rpm and maximum torque.
- What are the two major factors that affect the volumetric efficiency of a hydraulic motor? Flow rate of motor Qa & Speed of the motor N
- What affect does internal part wear in a hydraulic motor have on its volumetric efficiency? Internal part wear raises Ƞmech value as it reduces friction resulting in less metal-metal contact. It lowers Ƞvol resulting in a sizable decline in total efficiency.
- State what affect input flow rate has on the speed of motor. Motor’s speed is directly proportional to input flow rate.
- Explain why an increase in pressure drop across hydraulic motor will reduce its efficiency. As it creates pressure difference between motor’s inlet and outlet.
- When asked to identify the working condition of a hydraulic motor, what measurement would you identify to your supervisor? Outlet port pressure Brake air pressure Actual vane motor speed Inlet port pressure Vane motor flow CONCLUSION: Vane motors are the most widely used type of air pump. It has a simple design and can be placed anywhere. The vane motor is also very adaptable, has a very low noise level, and produces a lot of torque at low speeds when compared to other motors. Performance characteristics of this hydraulic motor include volumetric efficiency, mechanical efficiency, and overall efficiency.
