1. Unit
There is no need to talk about the most basic knowledge points.
Metric units
3 basic units: International System of Units (SI)
Mass: m Unit: Kilogram (kg)
Length: l Unit: Meter (m)
Time: t Unit: Second (s)
Kinematics
Linear velocity and angular velocity
Linear acceleration and angular acceleration
power
Imperial unit
Sometimes you will encounter imperial units in certain machines and parts in your work, so you need to have a certain understanding of imperial units and make simple conversions.
Mass, weight, force:
Unit: Pound (lb) (Ounce (oz): 1 lb = 16 oz)
length :
Unit: inch (in) [1 foot (ft) = 12 inches-1 yard (yd) = 3 feet]
time :
Unit: second (s)
Line speed :
Unit: inch per second (in/s)
Linear acceleration:
Unit: inches per square second (in/s²)
Torque:
Unit: inch pounds (in.lb)
Inertia:
Unit: inch pounds square second (in.lb.s²)
Equivalent metric and imperial units (converted)
weight :
1 pound (lb) = 453,59237 g = 0,45359237 kg = 4,44822 N
length :
1 inch (in) = 2,54 cm = 0,0254 m
Torque:
1 inch pound (in.lb) = 0,1130234 Nm
Inertia:
1 inch pound second square (in.lb.s²) = 0,112961 kg.m²
Gravity acceleration:
g = 386 in/s² = 32,12 ft/s² = 9,81 m/s²
2. Mechanical formula
There are nothing more than two kinds of motion: linear and angular motion
Linear motion:
Angle movement:
kinetic energy:
Three, some inertia calculations
density:
Unit: Kilogram per cubic meter (Kg/m3) Pound per cubic foot (lb/in3)
The weight carried by a volume depends on the material it is composed of.
Calculate the volume based on the shape:
When the cuboid:
Solid cylinder:
Hollow cylinder:
Force arm and quality:
Okay, here's the point of dry goods!
Commonly used moment of inertia calculation formula table:
