你这里所说的两句句子都成立.
但,Being disappointed with the results of the experiments 应当看做是disappointe 动词的被动形式,不是现在分词做状语.一般很少这样用,Disappointed with the results of the experiments 已经能过足以表达原句的意思了.
Tied of sleeping on the floor, A young man saved up for years to buy a real bed. 是新概念第二册中某一篇.理解是一样的,但这个词“being” 是现在分词的形式,不能理解成现在分词做状语.
若要考虑时态的话,还可以：Having been disappointed with the results of the experiments, ... .