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Vibration And Noise / Vibrasie en geraas - 354

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The diagram shows two thin disks, which are pinned and free to rotate about their geometrical centres. The disks are connected by an elastic spring with a stiffness, k, and rotate without friction through angles theta subscript 1 and theta subscript 2 respectively. The respective masses of disk 1 and disk 2 are denoted m subscript 1 and m subscript 2. The elastic spring is connected to both disks at radius, r. Disk 1 has a radius of r and disk 2 a radius of R. Unless specified otherwise please round off all answers to 2 decimal points and DO NOT include units with your answer.

Die diagram vertoon twee dun skywe, wat vasgepen is en vrylik roteer om hulle geometriese middelpunte. Die skywe is verbind deur 'n elastiese veer met 'n styfheid, k, en hulle roteer sonder wrywing deur hoeke theta subscript 1 en theta subscript 2. Die massas van skyf 1 en skyf 2 word telkens deur die simbole 

Image failed to load: m subscript 1
 en m subscript 2 verskaf.  Die elastiese veer is verbind aan albei skywe by 'n radius van r.  Skyf 1 het 'n radius van 
Image failed to load: r
 en skyf 2 het 'n radius van R. Rond alle antwoorde tot 2 desimale punte af en MOENIE eenhede by u antwoord insluit nie.

Determine the equations of motion for the system, symbolically, in matrix form. First, write the full geometric equations without any assumptions. Make the small-angle assumption only when the equations are written in matrix form.  The system's equation of motion then has a mass matrix of the form, open square brackets table row cell m subscript 11 end cell 0 row 0 cell m subscript 22 end cell end table close square brackets

Calculate the value of m subscript 22

Work with the units as they were provided. 

Use: m1 = 1.6 kg, m2 = 1.5 kg, k = 1.7 N/m, r = 9.6 m, R = 5.8 m

Bepaal die bewegingsvergelykings van die sisteem, simbolies, in matriksvorm. Skryf eers die vergelykings ten volle uit met alle geometriese funksies. Maak eers die klein hoek aanname wanneer u die antwoord in matriksform skryf.

Die bewegingsvergelyking van die sisteem het `n massamatriks in die vorm van, open square brackets table row cell m subscript 11 end cell 0 row 0 cell m subscript 22 end cell end table close square brackets.

Bereken die waarde van m subscript 22

Werk met die gegewe eenhede.

Gebruik: m1 = 1.6 kg, m2 = 1.5 kg, k = 1.7 N/m, r = 9.6 m, R = 5.8 m

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Which diagram(s) describe the following system's mode shapes?

open square brackets table row cell 2.25 end cell 0 row 0 cell 6.75 end cell end table close square brackets open parentheses table row cell theta with.. on top subscript 1 end cell row cell theta with.. on top subscript 2 end cell end table close parentheses plus open square brackets table row 225 cell negative 225 end cell row cell negative 225 end cell 225 end table close square brackets open parentheses table row cell theta subscript 1 end cell row cell theta subscript 2 end cell end table close parentheses equals open parentheses table row 0 row 0 end table close parentheses

Watter diagram(me) beskryf die onderstaande sisteem se modevorms?

open square brackets table row cell 2.25 end cell 0 row 0 cell 6.75 end cell end table close square brackets open parentheses table row cell theta with.. on top subscript 1 end cell row cell theta with.. on top subscript 2 end cell end table close parentheses plus open square brackets table row 225 cell negative 225 end cell row cell negative 225 end cell 225 end table close square brackets open parentheses table row cell theta subscript 1 end cell row cell theta subscript 2 end cell end table close parentheses equals open parentheses table row 0 row 0 end table close parentheses

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A pendulum with length L is connected to two springs with stiffness k.  The mass m of the pendulum can be seen as a point mass. Assume that the pendulum moves through small angles and that the springs only act horizontally on the pendulum. Assume the springs are not stretched or compressed at equilibrium. Assume that g equals 9.81 space straight m divided by straight s squared.

The equation of motion of the system can be written in the form:

A theta with ¨ on top space plus space B theta space equals space 0

Use these values to answer the following questions:

 m equals17 kgk equals773 straight N divided by straight m and L equalsstraight m.

NB: Provide your answer to two (2) decimal places and do not use any units in your final answer. Example: 2.099145... [m] should be entered as 2.10. Use SI-units in your answers.

Calculate the value of A.

'n Pendulum met lengte L is gebind aan twee vere met styfheid k.  Die massa mass m van die pendulum kan gesien word as 'n punt massa. Aanvaar dat die pendulum slegs met klein hoeke beweeg en dat die vere slegs horisontaal op die pendulum uitwerk. Aanvaar dat die vere nie by ewewig gerek of saamgedruk is nie. Aanvaar dat g equals 9.81 space straight m divided by straight s squared.

Die bewegingsvergelyking van die sisteem kan geskryf word in die vorm van:

A theta with ¨ on top space plus space B theta space equals space 0

Gebruik die waardes hieronder om die volgende vra te beantwoord:

 m equals17 kgk equals773 straight N divided by straight m en L equalsstraight m.

LW: Gebruik twee (2) desimale in die finale antwoord. Moet nie eenhede gebruik in die antwoord nie. Voorbeeld: 2.099145... [m] moet as 2.10 ingeskryf word. Gebruik SI-eenhede om vrae te beantwoord.

Bereken die waarde van A.

 

 

 

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Determine the natural frequency, omega subscript n, of the system in rad/s. 

Bepaal die natuurlike frekwensie, omega subscript n, van die sisteem in rad/s.

 

 

 

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If the two springs were to be replaced by a single spring at length L on the pendulum, what stiffness [unit: N/m] of the new spring will replicate the motion of the current system. 

As die twee vere deur 'n enkele veer  op lengte L op die pendulum vervang sou word, watter styfheid  [eenheid : N/m] van die nuwe veer sal die beweging van die huidige stelsel herhaal.

 

 

 

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What effect will a larger pendulum mass have on the natural frequency of the system?

Wat sal die uitwerking op die natuurlike frekwensie van die stelsel wees as die pendulum swaarder gemaak word?

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Calculate the value of B.

Bereken die waarde van B.

 

 

 

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What effect will a longer pendulum have on the natural frequency of the system?

Wat sal die uitwerking op die natuurlike frekwensie van die stelsel wees as die pendulum langer gemaak word?

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