--%>
Assignment Help - homework help

Modal Combination Rules

What are the Modal Combination Rules in order to determine the peak value of the total response?

E

Expert

Verified

Modal Combination Rules:

Rules to combine the peak modal responses rno (n = 1, 2, …, N) in order to determine the peak value of the total response (ro).

1. Absolute Sum (ABSSUM)

2065_modal rules1.jpg

- gives upper bound value which is usually too conservative
- not popular in structural design applications

2. Square-Root-of-Sum-of-Squares (SRSS)

1937_modal rules2.jpg

- the squared modal peaks are summed, and then find the square root of the sum
- provides excellent response estimates for structures with well-separated natural frequencies

3. Complete Quadratic Combination (CQC)

- applicable to a wider class of structures as it overcomes the limitations of the SRSS rule
- Each of the N2 terms on the right hand side of the equation is the product of the peak responses in the ith and nth modes and the correlation coefficient ρin (0 to 1) for these two modes.

1757_modal rules3.jpg

1212_modal rules4.jpg

   Related Questions in Mechanical Engineering

  • Q : Bernoulli's equation From Bernoulli's

    From Bernoulli's equation we know that presure head + velocity head at inlet and outlet header is same. If so  what is ' W' then in the equation ?

    		•
  • Q : Efficient use of waste heat and

    Efficient use of waste heat and renewable heat sources 1. Describe how you might recover heat from (a) a process exhaust gas stream (e.g. from an oven) and (b) a process warm water stream (e.

    		•
  • Q : Conformance to standards in product

    Conformance to standards and specifications: These are standards laid down by national and international authorities. For instance, in Canada there is the Standards Council of Canada (SCC). The United States has many standards bodies including MIL (US

    		•
  • Q : Aim of an airspeed indicator in aircraft

    What is the main aim of an airspeed indicator in aircraft?

    		•
  • Q : To designe pump how to design e gear

    how to design e gear pump. show the process.

    		•
  • Q : Arena Are you able to assist with these

    Are you able to assist with these two assignments in Arena simulation below? You can use the Basic Process instead of Blocks and Elements. An office of state license bureau has two types of arrivals. Individuals interested in purchasing new plates are characterized to have inter-arrival times dis

    		•
  • Q : SI Engines Illustrate why several types

    Illustrate why several types of the sound are generated in different bikes, although they run on the SI Engines?

    		•
  • Q : Difference between mill and mill-drill

    Difference between mill and mill-drill: Nowadays numerous manufactures are combining machines; a mill-drill is one of such. This is a combination of a drill and a mill, a mill eliminates stock from material (genera

    		•
  • Q : State Concurrent Engineering Concurrent

    Concurrent Engineering has happened primarily as a result of the need to shorten product development times, but improving product quality and reducing product life-cycle costs are important considerations. Some companies have even gone to the extent o

    		•
  • Q : Modal Combination Rules What are the

    What are the Modal Combination Rules in order to determine the peak value of the total response?

    		•