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3 years ago

Explain working of Laser Doppler Vibrometer with diagram.

Engineering

1 answer:

Klio2033 [76]3 years ago

6 0

Answer:

A laser-Doppler vibrometer identifies the Doppler effect or shift of laser light reflected from the sample object

Explanation:

A laser-Doppler vibrometer (e.g. Micro Motion Analyzer 400 from Polytec) identifies the Doppler effect or shift of laser light reflected from the sample object .At a beam splitter, a laser beam is partitioned into a measuring beam and a reference beam that deflects 90 ° upwards and transmit to the reference mirror "RM." Both beams come back to the beam splitter.

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A diesel engine with CR= 20 has inlet at 520R, a maximum pressure of 920 psia and maximum temperature of 3200 R. With cold air p

Stella [2.4K]

Answer:

Cut-off ratio $\dfrac{V_3}{V_2}=6.15$

Cxpansion ratio $\dfrac{V_4}{V_3}=3.25$

The exhaust temperature $T_4=1997.5R$

Explanation:

Compression ratio CR(r)=20

$\dfrac{V_1}{V_2}=20$

$P_2=P_3=920 psia$

$T_1=520 R ,T_{max}=T_3,T_3=3200 R$

We know that for air γ=1.4

If we assume that in diesel engine all process is adiabatic then

$\dfrac{T_2}{T_1}=r^{\gamma -1}$

$\dfrac{T_2}{520}=20^{1.4 -1}$

$T_2=1723.28R$

$\dfrac{V_3}{V_2}=\dfrac{T_3}{T_2}$

$\dfrac{V_3}{V_2}=\dfrac{3200}{520}$

So cut-off ratio $\dfrac{V_3}{V_2}=6.15$

$\dfrac{V_1}{V_2}=\dfrac{V_4}{V_3}\times\dfrac{V_3}{V_2}$

Now putting the values in above equation

$\dfrac20=\dfrac{V_4}{V_3}\times 6.15$

$\dfrac{V_4}{V_3}=3.25$

So expansion ratio $\dfrac{V_4}{V_3}=3.25$ .

$\dfrac{T_4}{T_3}=(expansion\ ratio)^{\gamma -1}$

$\dfrac{T_3}{T_4}=(3.25)^{1.4 -1}$

$T_4=1997.5R$

So the exhaust temperature $T_4=1997.5R$

3 0

4 years ago

Briggs & Stratton engines feature both a pressure lubrication and a pressure filtration system. Which statement is true?

Andreyy89

Answer would be Letter B

7 0

3 years ago

Which of the following waste characteristic is considered to be hazardous:

Lynna [10]

Answer:

D) all of the above

Explanation:

8 0

4 years ago

1. Declare a variable named num with an

FrozenT [24]

The code to

Declare a variable and increment with a while loop until the variable is not less than 5

Create a function that returns the product of two numbers

Uses the new keyword to create an array

were written in JavaScript and are found in the attached images

<h3>Declaring a variable</h3>

The first code declares a variable called num and gives it an initial value of 0. It then enters a while loop that lauches a message box (using <em>window.alert</em>) to print the message "<em>Keep going</em>" as long as num remains less than 5.

If nothing is done within the loop to increment num towards the value 5, the loop will go on endlessly notifying the user to "<em>Keep going</em>".

So, an increment of 1 was added to the loop body to increment the variable num. This makes sure the loop terminates.

<h3>Creating a function that returns the product of two numbers</h3>

Here, a function was created that receives two arguments (n1 and n2), then returns the product (n1 * n2)

<h3>Declaring an Array</h3>

This last code segment creates an array using the new keyword. The new keyword is generally used in constructing objects.

In this case the object constructed is an array having three strings;

my <em>first name</em>

my <em>nickname</em>, and

my <em>last name</em>

See another solved JavaScript problem here brainly.com/question/23610566

7 0

3 years ago

Question # 1

Airida [17]

Answer:

standardization

4 0

3 years ago