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Found 6 results

  1. Hi. I want to be compare the composite analysis and contact surface (freeze) the example is above picture. And I want to check the ERP between 0~3000Hz. and I can get the follow this. (damping material density is 1856.07kg/m^3) The blue line is contact surface(freeze) model, The black line is composite model. why the blue line is more big value than black line abouy twice. why the blue line is more big value than black line. I want to know why two lines are different exactly. contact_al_dam.fem contact_al_dam.pch compostie_test_revised.fem compostie_test_revised.pch
  2. hello all I am defining optimisation to reduce erp by topology optimisation. My objective is to find optimum material distribution to have low erp my defination goes as dconstraint: Erp: upper bound > (Target values) #### Volumefrac= upperbound 0.3 design volume objective= minimize design volume Loadstep = Modal frequency Response. ###For this setup I get error selected subcase not compatible with type of response while setting constraint on ERP how do i set the erp as target value. Regards Pratik
  3. hello im triying to do a topography optimizaiton using ERP as a response, and a minmax objective. when i try to solve it i got the following error: *** ERROR # 2148 *** Invalid design problem. All the sensitivities of response 1 (objective) are zero.
  4. Hi everyone, I am working on a motor stator. Earlier I was able to find equivalent radiated power(ERP) on the surface nodes of the stator. But now I need to find the ERP in space or say at microphone location. How can I do that?
  5. Hello, I am currently working on the sound radiation of a vibrating structure and I am trying to use the equivalent radiated power (ERP) value of the outer surface of the structure as an indicator of the radiated sound power. However, I have noticed an important disagreement between the Hyperworks Help documentation on how the ERP value is computed and the engineering literature. How the ERP computation is described in the HyperWorks documentation: In the literature (Norton, M.P. : Fundamentals of noise and vibration analysis for engineers), the radiated sound power is described using the radiation ratio, not the radiation loss factor: The difference is that there is no factor 1/2 and the radiation ratio (sigma) is used instead of the radiation loss factor. This radiation ratio has the following formula for infinite flat plates: and more complicated formulas for other geometries, but it is clearly frequency-dependant, as it can be seen as well on the following plot: . However, in the PARAM control card of OPTISTRUCT, one can only set a fixed value for the ERPRLF, so they clearly do not refer to the same physical quantity. In the book of Norton, the radiation loss factor (RLF) is defined as follows: . It is obvious that, if one introduces this formula in the formula for the ERP in the Hyperworks Documentation, one does obtain the radiated sound power as defined in the handbook, but multiplied with a factor (1/2)*rho_0*c /(omega*rho_S). I kindly ask you to explain to me this difference and to which extent one can use the ERP (as defined in the documentation) as an indicator of sound vibration of a structure. Best regards, Matteo
  6. Hi sir, When I am trying to run frequency response analysis with control cards as ERP, it is showing me below attached error
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