matlab代写-MECHENG 722

时间：2021-05-16

MECHENG 722: Engineering Vibrations – Lab Project

Introduction

In this project you are required to process the vibration (accelerance) measurements that

you took in Lab 2 (cantilever beam) to estimate natural frequencies, mode shapes and loss

factors using the SDOF circle fit method and the M-files available on Canvas. The use of the

M-files was described in the last lecture on Vibration Measurement and Testing – see the

lecture recording for details.

Note: if your data is no good let me know and I will provide input data for you.

Procedure

Load your data for input accelerance (i.e. when you hit near the tip). Using the circle fit

method estimate natural frequencies and loss factors for the first 3 modes. Calculate the

natural frequencies (you can use your software from project A).

Estimate these modal properties for one or more other impact points and compare.

For other impact points estimate only the diameter of the modal circles for only two of the

modes (you choose which), from which you can estimate the mode shapes of these 2 modes.

Report

Present your results in a report. A formal report (abstract, introduction, conclusions etc.) is

not required. Hand-written material is perfectly satisfactory. However, your submission

should be well presented, neatly laid out and easy to follow and should focus on the results

and your discussion of them. Your discussion should reveal a good understanding of factors

that influence the predictions and the experimentally-derived estimates. Graphs should be

properly labeled. Marks will be deducted for poor presentation. There are no formal length

requirements.

The report should contain:

1. A table showing the theoretically predicted and experimentally estimated natural

frequencies (in Hz) for the first 3 modes together with your estimates of the loss

factors of those modes.

2. A graph that overlays the theoretical and experimentally estimated mode shapes

(scaled appropriately) for each of the two modes being analysed (i.e. one graph for

each mode).

3. A written section with your observations and comments on the results. You can

include extra graphs, etc as evidence of your observations if required. Comment on

the similarities and differences between the predictions and the values derived from

measured data, and suggest possible reasons for these.

2

Submission: Due date: 12.00 pm Friday 21 May.

This project counts as 10% of the total assessment for the paper.

Note that this is an individual project. Evidence of copying will be treated in accordance with

the University regulations on cheating.

VSS 24/3/2021

欢迎咨询51学霸君

Introduction

In this project you are required to process the vibration (accelerance) measurements that

you took in Lab 2 (cantilever beam) to estimate natural frequencies, mode shapes and loss

factors using the SDOF circle fit method and the M-files available on Canvas. The use of the

M-files was described in the last lecture on Vibration Measurement and Testing – see the

lecture recording for details.

Note: if your data is no good let me know and I will provide input data for you.

Procedure

Load your data for input accelerance (i.e. when you hit near the tip). Using the circle fit

method estimate natural frequencies and loss factors for the first 3 modes. Calculate the

natural frequencies (you can use your software from project A).

Estimate these modal properties for one or more other impact points and compare.

For other impact points estimate only the diameter of the modal circles for only two of the

modes (you choose which), from which you can estimate the mode shapes of these 2 modes.

Report

Present your results in a report. A formal report (abstract, introduction, conclusions etc.) is

not required. Hand-written material is perfectly satisfactory. However, your submission

should be well presented, neatly laid out and easy to follow and should focus on the results

and your discussion of them. Your discussion should reveal a good understanding of factors

that influence the predictions and the experimentally-derived estimates. Graphs should be

properly labeled. Marks will be deducted for poor presentation. There are no formal length

requirements.

The report should contain:

1. A table showing the theoretically predicted and experimentally estimated natural

frequencies (in Hz) for the first 3 modes together with your estimates of the loss

factors of those modes.

2. A graph that overlays the theoretical and experimentally estimated mode shapes

(scaled appropriately) for each of the two modes being analysed (i.e. one graph for

each mode).

3. A written section with your observations and comments on the results. You can

include extra graphs, etc as evidence of your observations if required. Comment on

the similarities and differences between the predictions and the values derived from

measured data, and suggest possible reasons for these.

2

Submission: Due date: 12.00 pm Friday 21 May.

This project counts as 10% of the total assessment for the paper.

Note that this is an individual project. Evidence of copying will be treated in accordance with

the University regulations on cheating.

VSS 24/3/2021

欢迎咨询51学霸君

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