How many (non-dimensional) fl-groups are there? Find these non-dimensional groups. Can one of the 11-groups be considered a Reynolds number?

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Homework 6

1. The period of a pendulum, T, is assumed (correctly or incorrectly) to depend on its mass, M, the length of the pendulum. P, the acceleration due to gravity, 9, and the angle of swing, O. Using dimensional analysis, nondimensionalize the period, T, and express its dependence on the other non-dimensional terms.

2. Under certain conditions, wind blowing past a rectangular speed limit sign can cause the sign to oscillate with a frequency w. Assume that co is a function of the sign width, b, sign height. h, wind velocity. V. air density p, and an elastic constant, k. for the supporting pole.

Hint: The constant k has dimensions of [force x length].

  • a) How many (non-dimensional) fl-groups are there?
  • b) Find these non-dimensional groups.
  • c) Can one of the 11-groups be considered a Reynolds number?

3. Consider two different flows over geometrically similar airfoil shapes. one airfoil being twice the size of the other. Also, assume that the angle of attack is the same in both flows. The airflow over the smaller airfoil has freestream properties given by 71.= 200K. p. = 1.23 kg/m3. and V. = 100 m/s. The airflow over the larger airfoil is described by T. = 800 K. p= 1.739 kg/m3, and V. = 200 m/s. Assume that the viscosity of the air is proportional to T1I2 , while the heat capacities of air is a constant. Are the two flows similar?

Draw the example circuit. Explain the duty of each component. Draw, simulate and analyze the circuit by using PSpice.

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EE 309 Analog Electronics and Design Homework

Spring 2022-2023 Duration: 25/04/2023 15:00 – 28/04/2023 15:00
Q1 Q2 Q3 Q4 TOTAL
25 25 25 25 100
  1. As depicted in the figure, input voltage is 120 Volts (RMS) and diode drops are 0.7 Volts. Design this circuit with given two outputs and calculate turns ratio of transformer.
  • 10 V
  1. 100 V

 

  1. Consider a circuit using Si diodes and 10 k ohms resistors. Design this clipper circuit with output ranges below;
  2. -0.7 V and above
  3. +2.1 V and above
  • ±1.4 V
  1. As given in the figure a clamper circuit with the input signal Vi is proposed to design. Determine the output voltage with the exact solution step by step. Sketch transfer characteristic VO versus V

 

 

  1. A rectifier circuit with the excitation of is given. Assume the diodes are made of Silicon.Design this circuit and determine the turns ratio, PIV rating for the peak output voltage of;
  2. 25 V
  3. 100 V
  • Check the design and provide the results with Spice

 

  1. A regulator curcuit needs to be designed with an input power supply which has a nominal value of and can vary by ± %25 and nominal output voltage of 10 volts. For this purpose a zener diode is employed with specifications given; power rating of 1 W, 10 V drop at , output load current is to vary between -20 mA and zener resistance of
  2. If the minimum Zener current is to be , determine the required
  3. Determine the maximum variation in output voltage
  • Determine the regulation percent
    1. For the given network, input voltage having a maximum amplitude of  is applied to the circuit. (Note: All the diodes are Si).
      1. Sketch the output and calculate the dc (average) value of the output for the network.
      2. Draw, simulate and analyze the circuit by using PSpice

 

  1. A diode circuit is given with the input signal beside. (Use the resulting output voltage level of part a as Vp in this question)
  1. Determine the output voltage with the exact solution step by step.
  2. Sketch transfer characteristic VO versus Vi
  • Draw, simulate and analyze the circuit by using PSpice

 

 

 

 

    1. A GaAs diode with  is given as the configuration on figure
    2. Obtain analytical solution for each steps
    3. Draw output voltage waveform.
    4. Choose a resistance value for R(Select a value which provides practical rule)and plot wave form of current over resistance
    5. For which specific applications this design can be applied write your comments
    6. Draw, simulate and analyze the circuit by using PSpice

 

  1. [Research Question] Design a DC battery charger for an electrical vehicle which has a 96 V (nominal) BLDC hub motor which is plugged directly from grid to EV.
    1. Which type(s) of diode circuit(s) is(are) used for this device.
    2. Sketch the input and output waveforms
  • List the needed components for this design.
  1. Draw the example circuit.
  2. Explain the duty of each component.
  3. Draw, simulate and analyze the circuit by using PSpice.

Write a short project report for the engineers at ABC Chemicals documenting your findings.

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Numerical simulation using Aspen plus

Write a short project report for the engineers at ABC Chemicals documenting your findings. It should include the following information:

  • Criteria for optimization
  • Proposed system design (reactor type, reactor + separator + ??, how connected? feed, product, recycle streams? Explain and justify your design compared to other alternatives – no calculations or simulations required, just describe qualitatively)
  • Recommended operating conditions (reactor T, P, feed flows, catalyst weight, and resulting outlet flows)
  • Discussion of the effects of operating variables (what happens when T increases/decreases and why, etc.)
  • Preliminary profitability estimate. You only need to consider the gross margin between feed and product streams. You do not need to include other operating costs, equipment costs, etc. (No, not realistic, but you’ll have opportunities to learn and practice that in Plant Design)
  • Supporting equations, calculations, figures, etc. used in your analysis (only those necessary to illustrate your findings)

Derive AV for this circuit assuming RL=∞, draw the transfer function on the first plot above, and label AV. Explain whether you expect clipping or not.

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MOSFETs and BJTs

This is a small-signal problem built up towards a transfer function. Suppose the MOSFETs drawn have ID=1 mA when VGS=2.5 V, and Vth=0.5 V.

(a) Derive AV for this circuit assuming RL=∞, draw the transfer function on the first plot above, and label AV. Explain whether you expect clipping or not.

(b) Derive AV for this circuit assuming RL=50Ω, draw the transfer function on the second plot above, and label AV.

(c) Derive AV for this circuit assuming RL=50Ω and a coupling capacitor C, draw the transfer function on the third plot above, and label AV.

Did you find any examples of greenwashing? Which type of greenwashing? Was the data/information presented in the report valid and reasonable? Any misleading or specious data?

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Final Paper

PAPER INTRODUCTION

This final paper is in place of a final exam for this class. It is an individual assignment.

Follow the link https://about.nike.com/en/newsroom/reports/fy22-nike-inc-impact-report to the Corporate Social Responsibility (CSR) report of an American Fortune 500 company. Your assignment is to read all the sections that focus on various aspects of the company’s sustainability results, plans, and goals. Make sure to use critical thinking as you read.

Write a 2–3 pages (single-space) report following the requirements below. Your goal is to analyze their sustainability claims, making sure to cover the items listed below. You may have to follow links that are embedded in the report to find data. You may also do outside research to support your statements and thoughts. Cite all sources.

Please review and edit your paper so that it is organized, easy to follow and accurate. The quality of the writing will be a part of the grade.

 

REQUIREMENTS

1. Write a brief introduction about the company’s Sustainability Plans and goals. Explain any unfamiliar terminology that they use.

2. Find examples for a minimum of 3 of the sustainability analysis and measurement methods that we discussed in class. Explain how the examples fit the chosen sustainability topics. Here’s a list of the topics we covered in class. Please cite the examples with page numbers from the CSR report.

  • Circular Economy
  • Carbon Footprint
  • GHGs
  • Global Warming Potential/Environmental Impact Categories
  • Life Cycle Analysis
  • Pollution and Environmental Damage
  • Green Design Principles (specify which ones)
  • Carbon neutral, Net Zero Emissions and Carbon Negative

3. Which of the following areas does the CSR report address? Make the connection between what the CSR report says and what you know about the sustainability issues in these areas.

  • Energy
  • Water
  • Waste and E-Waste
  • Manufacturing/Supply Chain
  • Activities needed to reach Carbon Neutrality, Net Zero Emissions, etc.
  • Sustainable Development

4. Do an engineering analysis of your findings. Address topics:

  • Did you find any examples of greenwashing? Which type of greenwashing?
  • Was the data/information presented in the report valid and reasonable? Any misleading or specious data?
  • Are the company’s sustainability goals and plans realistic?

DELIVERABLES

A 2-3 pages (single spaced) paper. You may use charts, figures, and images to help illustrate your ideas, but they should not be used as a replacement for well-written explanations. Referenced or quoted materials should be cited in the paper. Any sign of plagiarism will result in a failing grade for this assignment.

Draw on relevant theory, and use Johnson & Scholes ”cultural web” to comprehensively and critically discuss the prevailing culture at your employer organization or an organization that you are familiar with.

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Draw on relevant theory, and use Johnson & Scholes ”cultural web”

Draw on relevant theory, and use Johnson & Scholes ”cultural web” to comprehensively and critically discuss the prevailing culture at your employer organization or an organization that you are familiar with.

Your answer must integrate both relevant theory and organizational data/examples (100%).

What is the width of the median in this cross section? What is the width of a typical lane in this cross section? What is the width of a typical shoulder in this cross section?

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Geometric questions

1- A 4 lane divided highway with a 12 feet median has a highway grade of -1.5%. The minor road approach grade is 3.5%. The design speed is 45 mph for the maior road and 40 mph for the minor road. Find the right turn departure sight distance for a passenger car taking a right turn from the minor road to the major road.

 

2- A new four lane state highway (posted speed limit 45 mph) is planned and you as the engineer are responsible for developing cross sections. Draw a typical cross section, while keeping in mind that there is only 74 feet of R.O.WV.

The entire 74 feet of R.O.WV. must be used.

There is a requirement of a concrete barrier in the median.

Highway design standards should be implemented.

  • What is the width of the median in this cross section?
  • What is the width of a typical lane in this cross section?
  • What is the width of a typical shoulder in this cross section?

 

3- A 2 lane highway with a grade of 6% has a posted speed limit of 50 mph and a design speed of 55 mph.

The minor road approach grade is -3%. Find the right turn departure sight distances for a passenger car taking a right turn from the minor road to the major road.

 

Based on the given specification, perform manual design calculation of each machine element using necessary equations and selection of standard parts.

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NU-BEng Mechanical Engineering

Task
Individual specification of machine components shown in Figure 1 will be given to each student.

Based on the given specification, students should perform the following activities:
Manual design calculation of each machine element using necessary equations and selection of standard parts.
Students may consider reasonable assumptions besides the given specification wherever necessary.
Stress analyses based on suitable elastic theories of failure.
Sketches that show free body diagrams, forces, stresses, etc.
After performing the above activities make a report with a minimum of 1500 words and upload through NU-CoE Learn online-link that will be provided.

Write an individual paper describing their capstone project, with an emphasis on the work you personally did on the project. Describe the challenge, biological inspiration, and solution, and other aspects described above. Also, provide reflection on bio-inspired approaches to engineering/innovation, on how the course did/did not impact how you think about engineering, Nature, sustainability, etc.

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Environmental Engineering Question

Each individual on the team must write an individual paper describing their capstone project, with an emphasis on the work you personally did on the project. Describe the challenge, biological inspiration, and solution, and other aspects described above. Also, provide reflection on bio-inspired approaches to engineering/innovation, on how the course did/did not impact how you think about engineering, Nature, sustainability, etc. The paper should be 750-1000 words long (3-4 pages, 12 pt font, 1.5 to double spaced, 1” margins) not including bibliography.

Obtain a complete state-space representation (SSR) for the following mathematical model: 2fi + 811 — 2f3 + 7r = ui r + 8r — 4/3 = u2 y = /I -I- 4u, .

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Modeling of Dynamic

Obtain a complete state-space representation (SSR) for the following mathematical model: 2fi + 811 — 2f3 + 7r = ui r + 8r — 4/3 = u2 y = /I -I- 4u, .