T1300411 Manifold/Cryopump Baffle blade spring D902817-v4
1/22/13
acceleration of gravity, m/s^2
corrected E factor, based on data from ACB D1002608-v3 sn 001
reduced modulus of elasticity, Pa
modulus of elasticity, psi
yield stress of C-250 steel, Pa
yield stress of C-250 steel, psi
Blade Parameters
number of springs
arc of blade spring, rad
blade arc angle, deg
radius of blade spring, m
radius of blade spring, in
horizontal distance of suspension point from blade spring mount, in
horizontal distance of suspension point from blade spring mount, m
length of blade spring, m
length of blade spring, in
spring design width, in
Weight suspended
weight of baffle, lbs
fixed balance weights, lbs
variable balance weights, lbs
weight of total suspended baffle with variable balance weights, lbs
mass of total baffle, kg
mass supported by each
blade spring, kg
load on blade spring, N
Calculate blade spring thickness
thickness of blade spring, in
FACTOR OF SAFETY
maximum stress, Pa
maximum stress, psi
check the factor of safety
constant factor, m
Vertical Bounce Frequency
vertical height of suspension
from blade spring mount, m
vertical height of suspension
from blade spring mount, in
unloaded height of blade spring, m
vertical distance blade moves, m
vertical distance blade moves, in
vertical resonant frequency based on blade depression, Hz
BALANCE WEIGHT INCREMENT
effective spring constant, N/m
incremental force for
15 lb weight change, N
height change for 15 lb of added weight, m
BLADE THICKNESS VARIATION
baffle balance weight change
with δt in change
in blade thickness, lbs
alternately, calculate the differential weight change
Simple Pendulum Frequency
length of pendulum, m
pendulum frequency, Hz
WIDTH OF BLADE SPRING
blade width at lin from tip, in
blade width at 1/4 from tip, in
blade width at 1/2 from tip, in
blade width at 3/4 from tip, in
max width of blade spring, in
Solid Works equation
max blade width amplitude, in
straight line eqtn
Stress at any Cross Section
maximum torque at mount, in-lb
stress at x, Pa
Stress at position x, Pa
Stress at position x, psi
Design Stress at position x, psi
summary of design parameters
factor of safety
weight of baffle plus balance wt, lbs
blade arc, deg
blade length, in
thickness, in
maximum width, in
radius of blade spring, in
horizontal distance of suspension point from blade spring mount, in
vertical height of suspension
from blade spring mount, in
vertical bounce frequency, Hz
effective spring constant, N/m
pendulum frequency, Hz
difference from straight line
support of baffle with flexure rod
yield stress of C-250 steel, Pa
yield stress of C-250 steel, psi
factor of safety
working stress of flexure wire, psi
working stress of flexure wire, Pa
number of wires per spring
diameter of wire, m
diameter of wire, in
weight of baffle, lbs
mass of baffle, kg
mass supported by each
wire, kg