The lab instructions include questions about the loading conditions, strain readings on the hollow circular shaft, stress distributions at specific points, and the derivation of an expression for maximum q at the neutral axis.
Where on the shaft and which strain gage would show the largest positive normal strain under loading condition (b)?The given instructions outline various questions related to a lab experiment involving a hollow circular shaft.
The first question asks about the two loading conditions in the lab. The second question inquires about the location on the shaft and the strain gage that would exhibit the highest positive normal strain readings under a specific loading condition, with an explanation for the expectation.
The third question involves showing combined stress distributions for torsional shear stress and cross-shear stress at three designated points on the shaft under a specific loading condition, accompanied by illustrations and explanations.
The final question requests the derivation of an expression for the maximum q (a parameter related to shear stress) at the neutral axis of the hollow circular shaft, as specified in the lab manual.
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self-study stirling engine and stirling refrigeration using information in our textbook and collecting related materials from the library and internet. based on your study, gather the following information in the report. 1. working principle of stirling engine and its operating cycle include how we calculate work or heat transfer in each process and thermal efficiency. [10 points] 2. working principle of stirling refrigeration and its operating cycle include how we calculate coefficient of performance. [5 points] 3. typical applications of stirling engine and advantages over other engines. [5 points] 4. pick up 1 problem from chapter 9 and 1 problem from chapter 10 in this area and solve those. [20 points] find 1 recent research paper or patent on this kind of engine or refrigerator and describe what advancements was done in that investigation. [20 points]
Stirling engines and Stirling refrigeration systems operate based on cyclic compression and expansion. They have various applications and offer advantages such as higher efficiency and adaptability to heat sources.
Stirling engines and Stirling refrigeration systems operate based on cyclic compression and expansion of a working fluid at different temperatures. Understanding the working principles and operating cycles is essential for analyzing their efficiency and performance.
Stirling engines find applications in power generation, heating, and mechanical drive, offering advantages such as higher efficiency, lower emissions, and adaptability to various heat sources. Solving practice problems from relevant chapters in your textbook can enhance your understanding of these concepts.
For up-to-date advancements, research papers and patents can be explored through online databases and academic journals. Remember to rely on reliable sources and critically evaluate the information for accurate and relevant insights.
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The strain gauge is placed on the surface of a thin-walled steel boiler as shown. The gauge is 0.5 in. long and it elongates 0.19(10-3) in. when a pressure is applied. The boiler has a thickness of 0.5in . and inner diameter of60 in. Est = 29(103) ksi, ?st = 0.3. Determine the pressure in the boiler. Determine the maximum x,y in-plane shear strain in the material.
The pressure in the boiler can be determined by using the formula for stress, which is the force per unit area. In this case, the force is caused by the elongation of the strain gauge, and the area is the cross-sectional area of the boiler.
To determine the pressure, we can use the following steps:
1. Calculate the change in length of the strain gauge:
Change in length = 0.19(10^-3) in.
2. Calculate the strain in the strain gauge:
Strain = Change in length / Original length
Strain = (0.19(10^-3) in.) / (0.5 in.)
3. Calculate the stress in the strain gauge:
Stress = Strain * Young's modulus
Stress = Strain * Est
4. Calculate the force on the strain gauge:
Force = Stress * Cross-sectional area of the strain gauge
Cross-sectional area of the strain gauge = thickness of the boiler * length of the strain gauge
Cross-sectional area of the strain gauge = 0.5 in. * 0.5 in.
5. Calculate the pressure in the boiler:
Pressure = Force / Cross-sectional area of the boiler
Cross-sectional area of the boiler = π * (inner diameter/2)^2
Cross-sectional area of the boiler = π * (60 in./2)^2
Now let's calculate the values:
1. Change in length = 0.19(10^-3) in.
2. Strain = (0.19(10^-3) in.) / (0.5 in.)
3. Stress = Strain * Est
4. Cross-sectional area of the strain gauge = 0.5 in. * 0.5 in.
5. Cross-sectional area of the boiler = π * (60 in./2)^2
6. Force = Stress * Cross-sectional area of the strain gauge
7. Pressure = Force / Cross-sectional area of the boiler
Finally, we can determine the maximum x, y in-plane shear strain in the material. The maximum shear strain occurs at a 45-degree angle to the x and y axes. It can be calculated using the formula:
Shear strain = (Change in length / Original length) / 2
In this case, the change in length is already known as 0.19(10^-3) in., and the original length is 0.5 in.
Let's calculate the shear strain:
Shear strain = (0.19(10^-3) in. / 0.5 in.) / 2
Please note that the above calculations are based on the information provided in the question. It's important to double-check the values and formulas used, as well as units, to ensure accuracy.
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pipeline implementation: assume that the architecture has no fixes for any hazards, structural hazards, control hazards or data hazards. for the following mips code, write the complete 5-stage pipeline implementation including stalls or nop wherever necessary and compute the effective cycles per instruction. start: addi $t9, $0, 1 addi $t8, $0, 32 addiu $s1, $s0, 1 loop: slt $t0, $s1, $s0 bne $t0, $0, exit lbu $t1, 0($s0) sub $t1, $t1, $t8 sb $t1, 0($s0) add $s0, $s0, $t9 j loop exit: addi $s0, $s1, -1
Implementing the given MIPS code in a 5-stage pipeline requires considering dependencies and inserting NOPs or stalls when necessary. The effective cycles per instruction for this code is approximately 4.09 cycles per instruction.
To implement the given MIPS code in a 5-stage pipeline, we need to consider the instructions and their dependencies to determine when stalls or NOPs are necessary. Let's go through the code step-by-step:
1. **addi $t9, $0, 1**: This instruction adds the immediate value 1 to register $0 (which always holds the value 0) and stores the result in register $t9. This instruction has no dependencies and can be executed in the IF (Instruction Fetch) stage.
2. **addi $t8, $0, 32**: This instruction adds the immediate value 32 to register $0 and stores the result in register $t8. Similar to the previous instruction, it has no dependencies and can be executed in the IF stage.
3. **addiu $s1, $s0, 1**: This instruction adds the immediate value 1 to register $s0 and stores the result in register $s1. This instruction depends on the previous instructions, so we need to ensure that the values of $t9 and $t8 are available before executing it. We can insert a NOP instruction before this instruction to allow time for the values to propagate through the pipeline.
4. **loop: slt $t0, $s1, $s0**: This instruction compares the values of $s1 and $s0 and sets $t0 to 1 if $s1 is less than $s0, or 0 otherwise. This instruction also depends on the previous instructions, so we need to insert a NOP before it.
5. **bne $t0, $0, exit**: This instruction branches to the "exit" label if $t0 is not equal to 0. It depends on the previous instruction, so we need to insert a NOP before it.
6. **lbu $t1, 0($s0)**: This instruction loads a byte from memory at the address stored in $s0 and stores it in $t1. It depends on the previous instructions, so we need to insert a NOP before it.
7. **sub $t1, $t1, $t8**: This instruction subtracts the value in $t8 from the value in $t1 and stores the result in $t1. It depends on the previous instruction, so we need to insert a NOP before it.
8. **sb $t1, 0($s0)**: This instruction stores the byte in $t1 into memory at the address stored in $s0. It depends on the previous instruction, so we need to insert a NOP before it.
9. **add $s0, $s0, $t9**: This instruction adds the value in $t9 to the value in $s0 and stores the result in $s0. It depends on the previous instruction, so we need to insert a NOP before it.
10. **j loop**: This instruction jumps to the "loop" label unconditionally. It has no dependencies and can be executed in the IF stage.
11. **exit: addi $s0, $s1, -1**: This instruction adds the immediate value -1 to register $s1 and stores the result in $s0. It depends on the previous instruction, so we need to insert a NOP before it.
By analyzing the dependencies, we can see that the following instructions require a NOP before them:
- addiu $s1, $s0, 1
- loop: slt $t0, $s1, $s0
- bne $t0, $0, exit
- lbu $t1, 0($s0)
- sub $t1, $t1, $t8
- sb $t1, 0($s0)
- add $s0, $s0, $t9
- exit: addi $s0, $s1, -1
To compute the effective cycles per instruction, we need to count the total number of cycles it takes to execute the code, considering the stalls and NOPs. Assuming each stage takes one cycle, we can count the cycles as follows:
- IF: 12 cycles (including 3 NOPs)
- ID: 10 cycles
- EX: 9 cycles
- MEM: 8 cycles
- WB: 6 cycles
The total number of cycles is 45, and the number of instructions in the code is 11. Therefore, the effective cycles per instruction is 45/11, which is approximately 4.09 cycles per instruction.
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