أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
The number of 'useful' modes to conseder in modal analyses is the number of modes for witch the sum of modal masses meet 90 to 95 % of the total mass token in considered dirction. In some cases it's a good practice to consider the missing masses by a 'pseudo mode'.
