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Formula Book for Hydraulics and Pneumatics. Fluid and Mechanical Engineering Systems. Department of Management and Engineering. Link ̈oping University. Revised 2008-10-27. Contents. Elementary Equations 1. 1.1 Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.
BASIC PNEUMATIC FORMULAS. Basic Valve Sizing: Air valves are sized for flow capacity (Cv) based upon a given cylinder piston size, stroke and travel time requirements. Cv us actually a flow coefficient that measures the amount of air a device can pass. The following formula can be used for air valve sizing:
Pneumatics is the utilization of compressed air in science and industry in order to perform mechanical work and control. We can either talk about pneumatics or pneumatic systems. In this course we define pneumatics as the control and transfer of power by using compressed air.
The formula used to compute force, pressure, and area in a hydraulic system can be described by force equals pressure times area and is written as: F=PxA. Pressure equals force divided by area.
Gear Displacement Calculation: The volumetric displacement of a gear pump or motor can be approximated by measurement of the internal parts and substituting the values in the following formula: V = 6.03 × W × (2 x D -L) × (L - D ÷ 2) Where. L. = displacement in in3/rev. = gear width in inches.
Absolute pressure = atmospheric pressure + gauge pressure reading. Absolute pressure = atmospheric pressure – vacuum pressure reading. Specific Gravity = SG = ; where ρs = density of substance . and ρref = density of reference liquid which is water at 4°C (39°F) = 1000 kg/m3 (1.94 slug/ft3) .
This formulary is meant to be of assistance in working on the exam and the exercises. The concepts which stand behind the here mentioned formulas are explained in the lecture and the recommended literature. The students should be able to understand and to reproduce them. 1. Hydrologic Processes.
