the term “synthesis” differs from “design” which is the process of prescribing the size, shape, material compositions, arrangements of parts, calculations of strength, methods of production, etc.
mechanis used in machines which have different functions and profiles may be the same.
the radii of the holes and the cross-section areas of the links are the kinematics dimensions.
machine is a mechanical system that can tranit or transform energy, materials or information.
almost all machines contain only one basic mechani.
in the following choices, which one is a planar higher pair?
in the following single-cylinder four-stroke internal combustion engine, which part is an output link?
in the following mechanis, which one has not redundant dof.
in the following mechani, the dof of the mechani is .
in the following mechanis, whose dof differ from others.
if the compound pair contains k links, the number of revolute joints is .
in the following mechani, it has redundant constraints.
in the following mechani, in order to have a determined motion, the mechani needs to have driving link(s).
in the following choices, which one cannot be deleted before the calculation of the dof of a mechani?
in the following mechani, the mechani has redundant constraint(s) and dof.
how many instant centers in the mechani below?
how many instant centers in the mechani below?
the cam mechani below has the dimensions: r=50mm, loa=20mm,lac=80mm, j1=90 degree. cam 1 rotates at a constant angular velocity of w1 = 10 rad/s. counterclockwise. p12 is an instant center. the angular velocity w2 of follower 2 is equal to:
the velocity vector polygon and acceleration vector polygon of the link are similar to the shape of the link.
the method of instant center can be applied to calculate velocity and acceleration.
kinematic ysis only involves the ysis of velocity and acceleration.
for a high pair, the contact point is the instant center.
for a planar mechani, the number of instant centers can be calculated by the equation , where k is the number of links in the mechani.
instant centers can be classified into _______ and _______.
the instant center of a revolute pair in a planar mechani is _________.
relative motion graphic method is based on two theories,_____________ and ___________.
as for the sliding pair in a planar mechani, the location of instant center is located at ______________.
determine the type of the linkage and type of the two side links ab and dc (crank or rocker) according to the grashof criterion. can the coupler bc rotates 360° with respect to the frame? lab = 80mm, lbc = 20mm, ldc = 45mm, lad = 60mm
determine the type of the linkage and type of the two side links ab and dc (crank or rocker) according to the grashof criterion. can the coupler bc rotates 360° with respect to the frame? lab = 20mm, lbc = 45mm, ldc = 70mm, lad = 90mm
find the name of the mechani
determine the type of the linkage and type of the two side links ab and dc (crank or rocker) according to the grash of criterion. the coupler bc rotates 360° with respect to the frame. lab = 45mm, lbc = 50mm, ldc = 60mm, lad = 20mm
the function of a linkage mechani is to transform the continuous rotation into continuous rotation, with a constant or variable angular velocity ratio.
the function of a linkage mechani is to transform the continuous rotation into oscillation or reciprocation (or the reverse), with a constant or variable velocity ratio.
the planar linkage mechanis have the advantage of great ability to trap lubricant between enveloping surfaces. therefore, the contact pressure and wear between two links are low.
for the planar linkages, the balance design and ytical calculation are very easy.
this mechani has quick-return characteristics.
cam mechanis can be classified by the shape of the follower end as
cam mechanis can be classified by the form of closure as
choose the motion curve which has a soft impulse
choose the motion curve is suitable for high speed operation.
the greatest distance through which the follower moves is known as the total follower travel, or the lift.
which statement about the helical gear is wrong?
which statement below is wrong?
for a given parameters, which kind of gears have a higher load capacity?
what are the correct meshing conditions for worm and worm wheel?
comparing with the spur gears, what are the advantages of helical gears?
gear mechanis can be used to tranit motion between ________.
in the gear train shown below, tooth numbers are z1=40, z2=40, z3=50, z1’=20, z3’=80. all the gears have the same module. i1h = ().
in the given gear train, z1 =z2’=z4=20, z2=z3=60, z5=40. the tranission ratio i15 = ().
in the given gear train, z1 =24, z2=33, z2’=21, z3=36, z3’=18, z5=78. please determine the tooth number of the gear 4, and the tranission ratio i15 = ().
tranission ratio indicates both ______ and ____.
if the dof of the epicyclic gear is 1, it is called ______; if the dof of the epicyclic gear is 2, it is called ______.
the structure of the epicyclic gears includes _________ and _________.
one kinematic pair can connect only two links.
there can only be one driven link in a mechani.
dof is the number of independent parameters to define uniquely the locations of all moving links within a mechani.
an output link can be either a driving link or a driven link.