Reference no: EM131285912 , Length: word count:1000
Vibration problem
Excessive vibration in a fan
Centrifugal fan on foundation used to force heated air over drying malt Specification:
- 2.5 m dia impeller
- spherical roller bearings
- multiple v-belt drive
Operation problems:
- Pulsations, on closure of inlet vanes (flow control device)
- Excessive vibration levels in spite of careful impeller balancing.
- Prominent second and third harmonics in the frequency spectrum
- When run down, irregular knocking noises produced.
Also damage to machine identified on inspection:
-
Failure of two 24mm bolts holding steel pedestal to concrete foundation block
- Partial disintegration of grouting between pedestal & foundation
- Some damage to shaft surfaces where bearings attached.
Using accelerometers, vibration amplitude was measured at various heights down the pedestal and foundation:
Questions
1. What are the likely causes of the vibration problems?
2. What would you, as plant engineer, recommend to prevent recurrence?
|
Relationship between a country savings
: What is the relationship between a country's savings, its government budget deficit, it's domestic investment in physical capital, and its foreign investments?
|
|
Which group decision-making technique do you recommend
: Which group decision-making technique do you recommend? Explain your reasoning, and use references to Rao (2009), Bolland and Fletcher (2012), or Sims (2002) to support your answer.
|
|
Determine the energy and exergy efficiency of nuclear power
: Consider the simplified diagram of a CANDU power reactor as in Fig. 8.14. Make reasonable assumptions and calculate the power cycle and determine the energy and exergy efficiency of nuclear power production.
|
|
Demand-supply equations
: The wheat market is represented by the following demand-supply equations. QD =3550-266P
|
|
What are the likely causes of the vibration problems
: What are the likely causes of the vibration problems and what would you, as plant engineer, recommend to prevent recurrence?
|
|
Provide a brief description or synopsis of the movie
: Identify and describe Social Psychology topics illustrated in the film. Examples may include: self-esteem, attributions, attitude change, attraction, friendship, love, aggression, group behaviors, prejudice/discrimination/stereotypes, conformity, ..
|
|
Does the information media have social responsibility
: Does the information media have social responsibility? If yes, in what ways? If not, why not? What is the role of the information and news media in the shaping of political opinions?
|
|
Number of individuals living in each unit
: A condominium complex contains 20 units. The following data shows the number of individuals living in each unit.
|
|
Temporary and permanent increases in their incomes
: Why is it important that consumers respond differently to temporary and permanent increases in their incomes? A) This implies that consumption will be highly sensitive to temporary changes in income.
|