How to make signal smooth using filter? I have measured the output of a mechanical system and obtained the signal shown at the attached image. I want to make it smoother by removing the chattering (I think it is called chattering). In order to achieve this I used a filter with transfer function: 

$\ T(s) = \frac{30}{s+30} $  

I used this filter to filter the measured data and the result was the the signal at the attached image. I would like to further process the signal to make it as better as possible. Can I achieve what I want by using another type of filter or is there any other process to follow ?
From what I can glance :

The chattering seems to be high-frequency compared to your signal of interest, it should not be hard to filter this chattering noise. You simply need to identify the frequency band of your signal and the frequency band of this noise. 

Could your perform an FFT to analyze the frequencies of your noise? Then design a filter that will not attenuate your signal of interest while attenuating the noise to an acceptable level.

Is it real-time processing or post-processing?