Ehsan Omidi

11 Questions 21 Answers 0 Followers

Questions related from Ehsan Omidi

Can a resonant mode of a flexible structure be excited by disturbing the system at the node of that mode?

Consider the second mode of a cantilever beam for instance, where a piezoelectric actuator is attached at the place as the node of this mode (about 0.78*L from the clamped end). Is a harmonic...

08 April 2015 3,168 9 View

Is there any motion control method applied directly to PDE of a flexible structure?

Among different approaches of control in systems with a governing PDE, one is to apply the controller based on the infinite dimensional model of the system; rather than reducing the order of the...

24 February 2015 5,530 1 View

Higher modes truncation effect of a PDE's solution?

When solving a PDE using the method of separation of variables, some higher modes are eventually truncated and not considered. How significant is the effect of higher modes that are not...

24 February 2015 6,835 4 View

How do I remove noise of accelerometer output?

I use a piezoelectric actuator for active control of a flexible structure, and measure the vibration amplitude at the same place using an accelerometer. When actuating the structure with a shaker,...

24 January 2015 8,093 8 View

How do I reduce noise in measured voltage by a piezoelectric sensor?

When piezoelectric ceramics are used as sensors, there is usually some noise in the measure voltage. What are the approaches to reduce this noise? Via an extra circuit or a filter.

24 January 2015 6,302 8 View

Is there any commercial AFM that uses piezoelectric cantilever for tapping mode deflection measurements?

I was wondering if any commercial Atomic Force Microscope (AFM) has been made by any company that only uses piezoelectric cantilevers instead of laser beam sensor for deflection measurement of the...

23 January 2015 3,907 9 View

How can nonlinear consensus algorithm dependent on derivative of input be applied?

Does anybody have an idea about how consensus algorithm could be applied for such a system? x_dot(t) = f ( x(t) , u(t) , u_dot(t) , t ) Usually for nonlinear consensus approaches, we do not see...

17 November 2014 5,992 2 View

Is there any model-based consensus approach available for a nonlinear dynamic system?

When applying the nonlinear consensus algorithms, most of them are not model-based. Is there any model-based consensus algorithm for a system with arbitrary nonlinear dynamics?

10 November 2014 6,941 6 View

Where does the error in the solution using Method of Multiple scales come from?

It has been shown in different studies that the result of the solution by Method of Multiple scales is a bit off the numerically simulated result. Where does this error come from?What has been...

13 October 2014 2,878 8 View

What is the main difference between the Saturation controller and the Positive Position Feedback (PPF)?

I have been working on the PPF controller for a couple of years, and now I want to start some research on the Saturation Controller. I know that both of them are resonant controllers for active...

18 September 2014 4,626 2 View

Does anybody know about a consensus tracker that is robust to fast changes in the changes in the frequency of the leader?

Using the consensus algorithm, the disagreement between the agents is enforced to zero. Now, suppose that we have designed a consensus linear tracker, and this tracker follows a leader that is...

18 September 2014 4,548 3 View