Podcast
Questions and Answers
Why is it essential to balance rotating and reciprocating parts in engines and machines?
Why is it essential to balance rotating and reciprocating parts in engines and machines?
- To decrease the stresses in various members
- To minimize pressure on main bearings and reduce vibrations (correct)
- To increase the loads on bearings
- To produce unpleasant vibrations
What happens if rotating and reciprocating parts are not properly balanced?
What happens if rotating and reciprocating parts are not properly balanced?
- Decrease in stresses in various members
- No impact on the machinery
- Increase in loads on bearings and stresses in members (correct)
- Reduction in vibrations
What is the purpose of attaching a second mass to a rotating shaft?
What is the purpose of attaching a second mass to a rotating shaft?
- To balance the effect of the centrifugal force of the first mass (correct)
- To increase the effect of centrifugal force
- To produce more vibrations
- To prevent bending of the shaft
What is the process called when providing a second mass to counteract the effect of the centrifugal force of the first mass?
What is the process called when providing a second mass to counteract the effect of the centrifugal force of the first mass?
In balancing a single rotating mass by a single mass rotating in the same plane, what is the objective?
In balancing a single rotating mass by a single mass rotating in the same plane, what is the objective?
What are some consequences of unbalanced rotating masses?
What are some consequences of unbalanced rotating masses?
What is the purpose of attaching a balancing mass in the same plane as the disturbing mass?
What is the purpose of attaching a balancing mass in the same plane as the disturbing mass?
What condition must be satisfied for static balancing of a system with two balancing masses in different planes?
What condition must be satisfied for static balancing of a system with two balancing masses in different planes?
What does dynamic balancing refer to in the context of attaching two balancing masses?
What does dynamic balancing refer to in the context of attaching two balancing masses?
In dynamic balancing, what is required for the net couple due to dynamic forces on the shaft?
In dynamic balancing, what is required for the net couple due to dynamic forces on the shaft?
What is one possibility when attaching two balancing masses for a disturbing mass lying in between them?
What is one possibility when attaching two balancing masses for a disturbing mass lying in between them?
What is required for static balancing of a system with two balancing masses for a disturbing mass lying between them?
What is required for static balancing of a system with two balancing masses for a disturbing mass lying between them?
What is necessary to achieve dynamic balancing when attaching two balancing masses for a disturbing mass lying between them?
What is necessary to achieve dynamic balancing when attaching two balancing masses for a disturbing mass lying between them?
What does aligning centroids vertically achieve in static balancing?
What does aligning centroids vertically achieve in static balancing?
What conditions must be satisfied for a complete secondary balance of an engine?
What conditions must be satisfied for a complete secondary balance of an engine?
What is the method used in balancing radial or V-engines with connecting rods connected to a common crank?
What is the method used in balancing radial or V-engines with connecting rods connected to a common crank?
What is the relationship between the direct crank OC and the reverse crank OC'?
What is the relationship between the direct crank OC and the reverse crank OC'?
How can the mass (m) of reciprocating parts at P be replaced for primary effects according to the text?
How can the mass (m) of reciprocating parts at P be replaced for primary effects according to the text?
Where are two masses (each m/2) placed for secondary effects after replacing the mass (m) of reciprocating parts?
Where are two masses (each m/2) placed for secondary effects after replacing the mass (m) of reciprocating parts?
What is the rotational speed of the secondary reverse crank OD' according to the text?
What is the rotational speed of the secondary reverse crank OD' according to the text?
What is the condition for static balance when the plane of the disturbing mass lies on one end of the planes of the balancing masses?
What is the condition for static balance when the plane of the disturbing mass lies on one end of the planes of the balancing masses?
In order to find the magnitude of balancing force in plane L, which point should moments be taken about?
In order to find the magnitude of balancing force in plane L, which point should moments be taken about?
Which method involves finding the centrifugal force exerted by each mass on the rotating shaft?
Which method involves finding the centrifugal force exerted by each mass on the rotating shaft?
How is the resultant centrifugal force calculated analytically?
How is the resultant centrifugal force calculated analytically?
What does the balancing force equal according to the analytical method?
What does the balancing force equal according to the analytical method?
In order to balance several masses rotating in the same plane, what angles are used to calculate the horizontal and vertical components of centrifugal forces?
In order to balance several masses rotating in the same plane, what angles are used to calculate the horizontal and vertical components of centrifugal forces?
To determine the magnitude and direction of the balancing mass analytically, what step is taken after calculating the horizontal and vertical components of centrifugal forces?
To determine the magnitude and direction of the balancing mass analytically, what step is taken after calculating the horizontal and vertical components of centrifugal forces?
What does tan(θ) represent when calculating the resultant centrifugal force analytically?
What does tan(θ) represent when calculating the resultant centrifugal force analytically?
What role does taking moments about specific points play in determining balancing forces?
What role does taking moments about specific points play in determining balancing forces?
What is a key requirement for achieving balance when considering multiple masses in rotation?
What is a key requirement for achieving balance when considering multiple masses in rotation?
What does the closing side ae represent as per the polygon law of forces?
What does the closing side ae represent as per the polygon law of forces?
What is the balancing force equal to?
What is the balancing force equal to?
What is the purpose of balancing reciprocating masses in an engine?
What is the purpose of balancing reciprocating masses in an engine?
What does the unbalanced force or shaking force result from in a reciprocating engine?
What does the unbalanced force or shaking force result from in a reciprocating engine?
In balancing reciprocating masses, what does adding appropriate balancing mass help achieve?
In balancing reciprocating masses, what does adding appropriate balancing mass help achieve?
What is the angle that the balancing mass makes with mass m1?
What is the angle that the balancing mass makes with mass m1?
How are the horizontal component of FB and FI related in the reciprocating engine mechanism?
How are the horizontal component of FB and FI related in the reciprocating engine mechanism?
What is the purpose of balancing reciprocating masses by adding balancing mass?
What is the purpose of balancing reciprocating masses by adding balancing mass?
What is the effect of reciprocating parts on an engine according to the text?
What is the effect of reciprocating parts on an engine according to the text?
What is the magnitude of the balancing mass required for a given radius of rotation if m1 = 200 kg, r1 = 0.2 m and r = 0.2 m?
What is the magnitude of the balancing mass required for a given radius of rotation if m1 = 200 kg, r1 = 0.2 m and r = 0.2 m?
What is the purpose of balancing the reciprocating masses in an engine mechanism?
What is the purpose of balancing the reciprocating masses in an engine mechanism?
What happens when the horizontal component of FB (FBH) is unbalanced?
What happens when the horizontal component of FB (FBH) is unbalanced?
What is the primary unbalanced force in a reciprocating engine considered equivalent to?
What is the primary unbalanced force in a reciprocating engine considered equivalent to?
How is the primary unbalanced force balanced in a reciprocating engine?
How is the primary unbalanced force balanced in a reciprocating engine?
Why are locomotives usually equipped with two cylinders placed at right angles to each other?
Why are locomotives usually equipped with two cylinders placed at right angles to each other?
In inside cylinder locomotives, where are the cylinders usually placed?
In inside cylinder locomotives, where are the cylinders usually placed?
What is the purpose of having coupled locomotives?
What is the purpose of having coupled locomotives?
How does adding appropriate balancing mass help reduce shaking force and shaking couple?
How does adding appropriate balancing mass help reduce shaking force and shaking couple?
What does m
represent in a reciprocating engine mechanism?
What does m
represent in a reciprocating engine mechanism?
What is the effect of an unbalanced primary force along the line of stroke?
What is the effect of an unbalanced primary force along the line of stroke?
What results from an unbalanced primary force perpendicular to the line of stroke?
What results from an unbalanced primary force perpendicular to the line of stroke?
What is the maximum magnitude of the unbalanced force along the perpendicular to the line of stroke known as?
What is the maximum magnitude of the unbalanced force along the perpendicular to the line of stroke known as?
In multi-cylinder in-line engines, what must be satisfied to achieve primary balance of the reciprocating parts?
In multi-cylinder in-line engines, what must be satisfied to achieve primary balance of the reciprocating parts?
What are the two conditions that must be satisfied to give the primary balance of reciprocating parts in a multi-cylinder engine?
What are the two conditions that must be satisfied to give the primary balance of reciprocating parts in a multi-cylinder engine?
What is essential for secondary disturbing force due to reciprocating mass to arise?
What is essential for secondary disturbing force due to reciprocating mass to arise?
How can the secondary forces in multi-cylinder in-line engines be equivalent to centrifugal forces?
How can the secondary forces in multi-cylinder in-line engines be equivalent to centrifugal forces?
What is the angle at which the tractive force is maximum or minimum?
What is the angle at which the tractive force is maximum or minimum?
What does it mean when it is said that 'primary couple polygon must close'?
What does it mean when it is said that 'primary couple polygon must close'?
What does a multi-cylinder in-line engine refer to?
What does a multi-cylinder in-line engine refer to?
What is the main reason for balancing rotating and reciprocating parts in engines and machines?
What is the main reason for balancing rotating and reciprocating parts in engines and machines?
What is the term used to describe the process of adding a second mass to counteract the effect of the centrifugal force of the first mass in balancing rotating masses?
What is the term used to describe the process of adding a second mass to counteract the effect of the centrifugal force of the first mass in balancing rotating masses?
In order to balance a single rotating mass by a single mass rotating in the same plane, what is the objective?
In order to balance a single rotating mass by a single mass rotating in the same plane, what is the objective?
Why is it important to attach a second mass to a rotating shaft in terms of balancing rotating masses?
Why is it important to attach a second mass to a rotating shaft in terms of balancing rotating masses?
What are the consequences of not properly balancing rotating and reciprocating parts in engines and machines?
What are the consequences of not properly balancing rotating and reciprocating parts in engines and machines?
How does adding a second mass to counteract centrifugal force affect the shaft in a rotating system?
How does adding a second mass to counteract centrifugal force affect the shaft in a rotating system?
What is the balancing force in the reciprocating engine mechanism?
What is the balancing force in the reciprocating engine mechanism?
In the reciprocating engine mechanism, what is the effect of the shaking couple?
In the reciprocating engine mechanism, what is the effect of the shaking couple?
What is the angle that the balancing mass makes with the horizontal mass of 200 kg?
What is the angle that the balancing mass makes with the horizontal mass of 200 kg?
Which method can be used to solve the problem of balancing masses analytically or graphically?
Which method can be used to solve the problem of balancing masses analytically or graphically?
What does the horizontal component of FB along the line of reciprocation balance in the reciprocating engine mechanism?
What does the horizontal component of FB along the line of reciprocation balance in the reciprocating engine mechanism?
What is the purpose of adding appropriate balancing mass in reciprocating engines?
What is the purpose of adding appropriate balancing mass in reciprocating engines?
What is the unbalanced force or shaking force denoted by in reciprocating engines?
What is the unbalanced force or shaking force denoted by in reciprocating engines?
How can vibrations be reduced in engines with reciprocating masses?
How can vibrations be reduced in engines with reciprocating masses?
In a reciprocating engine mechanism, what is the effect of adding a shaking couple?
In a reciprocating engine mechanism, what is the effect of adding a shaking couple?
What is the purpose of balancing reciprocating masses in engines?
What is the purpose of balancing reciprocating masses in engines?
What is the purpose of introducing two balancing masses in two different planes for a single rotating mass?
What is the purpose of introducing two balancing masses in two different planes for a single rotating mass?
In static balancing of a system with two balancing masses, what condition must be met regarding the line of action of centrifugal forces?
In static balancing of a system with two balancing masses, what condition must be met regarding the line of action of centrifugal forces?
When balancing a single rotating mass by two masses in two different planes, what is the primary goal in terms of the net dynamic force on the shaft?
When balancing a single rotating mass by two masses in two different planes, what is the primary goal in terms of the net dynamic force on the shaft?
Which is a key aspect of achieving complete balance when introducing two balancing masses for a single rotating mass?
Which is a key aspect of achieving complete balance when introducing two balancing masses for a single rotating mass?
What is a common consequence of using only one balancing mass in the same plane for a single rotating mass?
What is a common consequence of using only one balancing mass in the same plane for a single rotating mass?
In balancing a single rotating mass by a single mass in the same plane, what is essential about the centrifugal forces produced?
In balancing a single rotating mass by a single mass in the same plane, what is essential about the centrifugal forces produced?
What role does having two balancing masses play when dealing with a disturbing mass positioned in between them?
What role does having two balancing masses play when dealing with a disturbing mass positioned in between them?
When attaching two balancing masses, what condition ensures that the system is in complete balance?
When attaching two balancing masses, what condition ensures that the system is in complete balance?
Why are two balancing masses preferred over a single one when balancing a single rotating mass?
Why are two balancing masses preferred over a single one when balancing a single rotating mass?
In terms of static balance, what must be satisfied when dealing with two balancing masses for a single rotating mass?
In terms of static balance, what must be satisfied when dealing with two balancing masses for a single rotating mass?
What is the purpose of balancing the reciprocating masses in an engine mechanism?
What is the purpose of balancing the reciprocating masses in an engine mechanism?
In locomotives, what characterizes 'outside cylinder locomotives'?
In locomotives, what characterizes 'outside cylinder locomotives'?
For primary balancing in a reciprocating engine, what is the primary unbalanced force considered equivalent to?
For primary balancing in a reciprocating engine, what is the primary unbalanced force considered equivalent to?
What does adding appropriate balancing mass help achieve in reciprocating engines?
What does adding appropriate balancing mass help achieve in reciprocating engines?
What is the effect of unbalanced primary force along the line of stroke in a reciprocating engine?
What is the effect of unbalanced primary force along the line of stroke in a reciprocating engine?
How are locomotives usually equipped in terms of cylinders placement for uniformity in turning moment diagram?
How are locomotives usually equipped in terms of cylinders placement for uniformity in turning moment diagram?
What does the primary unbalanced force in a reciprocating engine act along?
What does the primary unbalanced force in a reciprocating engine act along?
'Inside cylinder locomotives' have their cylinders placed where in relation to the driving wheels?
'Inside cylinder locomotives' have their cylinders placed where in relation to the driving wheels?
What is the goal of partially balancing reciprocating masses in an engine?
What is the goal of partially balancing reciprocating masses in an engine?
What do secondary unbalanced forces of reciprocating masses form when they are equal and opposite?
What do secondary unbalanced forces of reciprocating masses form when they are equal and opposite?
To achieve static balance in a system with a disturbing mass lying on one end of the planes of the balancing masses, what must be true?
To achieve static balance in a system with a disturbing mass lying on one end of the planes of the balancing masses, what must be true?
What is true about the direction of the balancing force when finding the magnitude of balancing force in plane L analytically?
What is true about the direction of the balancing force when finding the magnitude of balancing force in plane L analytically?
What is the purpose of taking moments about point P when finding the balancing force in plane L?
What is the purpose of taking moments about point P when finding the balancing force in plane L?
How is the magnitude of the balancing mass found analytically when balancing several masses rotating in the same plane?
How is the magnitude of the balancing mass found analytically when balancing several masses rotating in the same plane?
What is true about balancing multiple masses rotating in the same plane using the analytical method?
What is true about balancing multiple masses rotating in the same plane using the analytical method?
When finding the magnitude and position of balancing mass graphically, what does ab represent in relation to mass m1?
When finding the magnitude and position of balancing mass graphically, what does ab represent in relation to mass m1?
In graphical method for finding balancing mass, what is represented by vectors bc, cd, and de?
In graphical method for finding balancing mass, what is represented by vectors bc, cd, and de?
What does resolving centrifugal forces horizontally and vertically help determine when balancing several masses analytically?
What does resolving centrifugal forces horizontally and vertically help determine when balancing several masses analytically?
'Tan θ = S V / SH', this equation is used to find what aspect when determining resultant centrifugal force analytically?
'Tan θ = S V / SH', this equation is used to find what aspect when determining resultant centrifugal force analytically?
'FC = m·r', where does 'm' represent when determining the magnitude of balancing mass analytically?
'FC = m·r', where does 'm' represent when determining the magnitude of balancing mass analytically?
What is the effect of an unbalanced primary force along the line of stroke in reciprocating parts?
What is the effect of an unbalanced primary force along the line of stroke in reciprocating parts?
In a multi-cylinder in-line engine, what must be equal to zero to achieve primary balance of reciprocating parts?
In a multi-cylinder in-line engine, what must be equal to zero to achieve primary balance of reciprocating parts?
What is the condition for the tractive force to be maximum or minimum in a reciprocating engine?
What is the condition for the tractive force to be maximum or minimum in a reciprocating engine?
What is the maximum magnitude of the unbalanced force along the perpendicular to the line of stroke known as?
What is the maximum magnitude of the unbalanced force along the perpendicular to the line of stroke known as?
In a multi-cylinder in-line engine, what should close to achieve primary balance of reciprocating parts?
In a multi-cylinder in-line engine, what should close to achieve primary balance of reciprocating parts?
What results from an unbalanced primary force perpendicular to the line of stroke in locomotives?
What results from an unbalanced primary force perpendicular to the line of stroke in locomotives?
How is the tractive force calculated in a reciprocating engine?
How is the tractive force calculated in a reciprocating engine?
What is the purpose of balancing the reciprocating parts in a multi-cylinder in-line engine?
What is the purpose of balancing the reciprocating parts in a multi-cylinder in-line engine?
What happens when considering multiple masses rotating in the same plane?
What happens when considering multiple masses rotating in the same plane?
What is the equivalent to the component parallel to the line of stroke of the centrifugal force due to reciprocating masses?
What is the equivalent to the component parallel to the line of stroke of the centrifugal force due to reciprocating masses?
What must be true in order to achieve a complete secondary balance of an engine?
What must be true in order to achieve a complete secondary balance of an engine?
What is the role of the direct and reverse cranks in balancing radial or V-engines?
What is the role of the direct and reverse cranks in balancing radial or V-engines?
In the reciprocating engine mechanism, what is the relationship between the direct and reverse cranks' rotations?
In the reciprocating engine mechanism, what is the relationship between the direct and reverse cranks' rotations?
For primary effects due to the mass of reciprocating parts, how is the mass (m) replaced for these effects?
For primary effects due to the mass of reciprocating parts, how is the mass (m) replaced for these effects?
What are the rotations of the secondary direct and reverse cranks OD and OD' respectively?
What are the rotations of the secondary direct and reverse cranks OD and OD' respectively?
What is the purpose of replacing the mass (m) of reciprocating parts by two masses (each m/2) for secondary effects?
What is the purpose of replacing the mass (m) of reciprocating parts by two masses (each m/2) for secondary effects?
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