Hi,<\/p>\n
Why harmonic analysis stress results are differ from transient structural (sinusoidal load) analysis (Non-linear large deflection on) even I have run transient analysis long enough to get steady state response.<\/p>\n
details of load and settings are given below.<\/p>\n
Harmonic analysis: acceleration in x- direction = 5g, damping ratio = 0.03 first i have run modal and got frequency range 1000 to 4000Hz than i have run harmonic and evaluate von-mises stress at 1000Hz result shows 1.51Mpa max value.<\/p>\n
In next step, I ran transient structural with Non-linear mat properties with large deflection ON\/OFF both.<\/p>\n
load: acceleration =49050*sin(2*pi*1000*time)). damping control Beta coeff 9.53e-06 calculated basis 0.03 damping ratio<\/p>\n
min. time step cal: 1\/(20*1000) = 0.00005sec. in graph control No of points = 20*1000*time.<\/p>\n
I ran for 1 sec and got periodic type results of von mises stress and max value comes out to be = 0.73Mpa which is lower than harmonic.<\/p>\n
my question is why there is a difference in harmonic and transient eventhough i got steady state periodic value which we can say harmonic.<\/p>\n
as per my understanding non-linear mat properites should not impact the result becaouse stress value is well below the plastic region.<\/p>\n
can anyone explain why there is a difference in both harmonic and transient structural????<\/p>\n","protected":false},"template":"","class_list":["post-349608","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t