Theory of Machines: Unit I: Kinematics of Mechanisms
Grashof's law
Kinematics of Mechanisms - Theory of Machines
Grashof's law states that for a planar four-bar mechanism, the sum of the shortest and longest links must be less than or equal to the sum of the lengths of two other links, if there is to be continuous relative rotation between two members.
GRASHOP'S LAW
• Law:
Grashof's law states that for a planar four-bar mechanism, the sum of the
shortest and longest links must be less than or equal to the sum of the lengths
of two other links, if there is to be continuous relative rotation between two
members.
Let
s
= Length of the shortest link,
l
= Length of the longest link, and
p
and q = Lengths of the other two links.
Then,
according to Grashof's law, one of the links (i.e., shortest link) will rotate
continuously relative to other three links, only when
• The four-bar chain that
satisfies the Grashof's law is known as Grashof's chain.
• If this inequality is not
satisfied, no link will make a complete rotation relative to other three links.
The four-bar chain that does not satisfy the Grashof's law is known as non-
Grashof chain.
Theory of Machines: Unit I: Kinematics of Mechanisms : Tag: : Kinematics of Mechanisms - Theory of Machines - Grashof's law
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Theory of Machines
ME3491 4th semester Mechanical Dept | 2021 Regulation | 4th Semester Mechanical Dept 2021 Regulation