The turning effect of a force applied to a rotational system at a distance from the axis of rotation. The moment is equal to the magnitude of the force multiplied by the perpendicular distance between its line of action and the axis of rotation.
More slides at http://bit.ly/2PIOIQM
The turning effect of a force applied to a rotational system at a distance from the axis of rotation. The moment is equal to the magnitude of the force multiplied by the perpendicular distance between its line of action and the axis of rotation.
More slides at http://bit.ly/2PIOIQM
Thoracic and rib cage anatomy, biomechanics, and pathomechanicsRadhika Chintamani
This slide show describes about thoracic and rib cage in detail with its anatomy, kinetics and kinematics along with force couple. the slideshow also describes about the pathology and pathomechanics related to the topic
Goniometry is the measuring of angles created by the bones of the body at the joints.1, 2, 3
The term goniometry is derived from two Greek words, gonia meaning angle and metron, meaning measure. 1, 2, 3, 4, 5,
System to measure the joint ranges in each plane of the joint is termed goniometry. 4
These measurements are done with instrument such as goniometer, a tape measure, inclinometers or by visual estimate.
To become science-based engineers, having a thorough knowledge of basic science or physical science, a broad knowledge of the principles and methods of mechanics, and an ability to apply those fundamentals in practical situations.Its very important for all students of engineering/diploma holders of any branch.
In physics, a force is any interaction that, when unopposed, will change the motion of an object. A force can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity.
Watch other topics in http://bit.ly/2PIOIQM
Effects of various types of lifting like stoop lifting, squat lifting, semi-squat lifting on the body and also when to use which type of lift to help prevent or minimize the risk of musculoskeletal injury.
Goniometry of lower limb joints/ROM of lower limb jointsShalu Thariwal
Goniometer, goniometry, hip joint, knee joint, ankle, ROM, range of motion, hip flexion, knee extension, ankle dorsiflexion and planter flexion, inversion, eversion, alignment, position, fulcrum, stationary arm, moving arm, normal range of motion.
Heat and Mass Transfer: Free Convection : Formulas and solved examples... Use of Heat and Mass transfer data book is necessary in order to obtain certain values.
Thoracic and rib cage anatomy, biomechanics, and pathomechanicsRadhika Chintamani
This slide show describes about thoracic and rib cage in detail with its anatomy, kinetics and kinematics along with force couple. the slideshow also describes about the pathology and pathomechanics related to the topic
Goniometry is the measuring of angles created by the bones of the body at the joints.1, 2, 3
The term goniometry is derived from two Greek words, gonia meaning angle and metron, meaning measure. 1, 2, 3, 4, 5,
System to measure the joint ranges in each plane of the joint is termed goniometry. 4
These measurements are done with instrument such as goniometer, a tape measure, inclinometers or by visual estimate.
To become science-based engineers, having a thorough knowledge of basic science or physical science, a broad knowledge of the principles and methods of mechanics, and an ability to apply those fundamentals in practical situations.Its very important for all students of engineering/diploma holders of any branch.
In physics, a force is any interaction that, when unopposed, will change the motion of an object. A force can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity.
Watch other topics in http://bit.ly/2PIOIQM
Effects of various types of lifting like stoop lifting, squat lifting, semi-squat lifting on the body and also when to use which type of lift to help prevent or minimize the risk of musculoskeletal injury.
Goniometry of lower limb joints/ROM of lower limb jointsShalu Thariwal
Goniometer, goniometry, hip joint, knee joint, ankle, ROM, range of motion, hip flexion, knee extension, ankle dorsiflexion and planter flexion, inversion, eversion, alignment, position, fulcrum, stationary arm, moving arm, normal range of motion.
Heat and Mass Transfer: Free Convection : Formulas and solved examples... Use of Heat and Mass transfer data book is necessary in order to obtain certain values.
The various forces acts on the reciprocating parts of an engine.
The resultant of all the forces acting on the body of the engine due to inertia forces only is known as unbalanced force or shaking force.
Unit 4- balancing of rotating masses, Dynamics of machines of VTU Syllabus prepared by Hareesha N Gowda, Asst. Prof, Dayananda Sagar College of Engg, Blore. Please write to hareeshang@gmail.com for suggestions and criticisms.
Unit 5- balancing of reciprocating masses, Dynamics of machines of VTU Syllabus prepared by Hareesha N Gowda, Asst. Prof, Dayananda Sagar College of Engg, Blore. Please write to hareeshang@gmail.com for suggestions and criticisms.
This ppt is as per class 12 Maharashtra State Board's new syllabus w.e.f. 2020. Images are taken from Google public sources and Maharashtra state board textbook of physics. Gif(videos) from Giphy.com. Only intention behind uploading these ppts is to help state board's class 12 students understand physics concepts.
Rotational dynamics as per class 12 Maharashtra State Board syllabusRutticka Kedare
This ppt is as per class 12 Maharashtra State Board's new syllabus w.e.f. 2020. Images are taken from Google public sources and Maharashtra state board textbook of physics. Gif(videos) from Giphy.com. Only intention behind uploading these ppts is to help state board's class 12 students understand physics concepts.
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
Impact of Ethnobotany in traditional medicine,
New development in herbals,
Bio-prospecting tools for drug discovery,
Role of Ethnopharmacology in drug evaluation,
Reverse Pharmacology.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
How to Create Map Views in the Odoo 17 ERPCeline George
The map views are useful for providing a geographical representation of data. They allow users to visualize and analyze the data in a more intuitive manner.
3. Static Balance
The condition which exists in a body which has an
absolutely even distribution of the weight mass around the
axis of rotation
This occurs when when there is no resultant
centrifugal force and the center of gravity is on the axis of
rotation.
4. Two masses
Static
balance
(two masses
in a plane) Static Balance
in a plane
Consider a light arm pivoted freely at the fulcrum O and
carrying masses m1, m2 at distances r1, r2 from O
respectively. In general the arm will rotate about O and the
system is said to be out of balance. For equilibrium there
must be balance of moments about O. i.e.
m1g x r1 = m2g x r2
or
m1r1 = m2r2
When in balance the arm may be set in any position and will
remain at rest in that position. The weights are said to be in
static balance and the center of gravity of the system is
located at O.
6. Dynamic Balance
The condition which exists in a rotating body when
the axis about which it is forced to rotate, or to which
reference is made, is parallel with a principal axis of inertia;
no products of inertia about the center of gravity of the body
exist in relation to the selected rotational axis.
This occurs when there is no resulting moment
along the axis.
7. Dynamic
balance (two
masses in a
Two masses
Dynamic Balance
in a plane
plane)
Now consider two light arms fixed to a shaft at bearing O
and rotating with angular velocity ω. The arms are in the
same plane and carry masses m1, m2 at radii r1, r2
respectively. Owing to the rotation each masses exerts an
inertia force radially outward on the bearing O.
The force due to m1 is m1 ω2 r1 (OA in the force diagram)
The force due to m2 is m2 ω2 r2 (AB in the force diagram)
9. Dynamic
balance (two The resultant out of balance force on the bearing is
masses in a given by OB in the force diagram.
plane)
when the dynamic load on the bearing is zero the
rotating system is said to be in dynamic balance. The
condition for no load at O is that two inertia force shall:
1. act along the same straight line but with opposite
sense
2. Be equal in magnitude
the relative positions of the masses are as in the
figure C shown earlier. The condition for equal inertia
forces is:
m1 ω2 r1 = m2 ω2 r2
Thus, since ω2 is the same both masses
m1r1 = m2r2
Two bodies in the same plane are in static balance when
pivoted about a given axis they will be in dynamic balance
at any speed when rotating about the same axis.
10. Method of
balancing Balancing
Method of
Rotors
Rotors
It was shown earlier that for a two mass system to be in
static balance the mr product for each mass had to be the
same. This is also the condition for the masses to be
balanced when rotating and suggests a method for ensuring
balance for rotating rotors such as turbine disks or car
wheel assemblies.
11. Method of
balancing In practice it is usually possible to balance a rotor to an
Rotors accuracy of 0.001 m-kg, i.e. the amount of residual
unbalance is equivalent to a mass of 1 kg at 1mm radius.
For a rotor of mass 10 tons this is equivalent to a
displacement x of he center of gravity from the axis of
rotation given by:
10 x 1000 x X = 0.0001
X = 10-7 m or 0.1 μm
The corresponding out-of-balance centrifugal force when
running at 3600 rpm is
m1 ω2 r1 = 10 x 1000 x 2Л 3600 x 10-7 kg-m/s2
60
= 142 N
It is usual to limit the out-of-balance force to be greater than
1 percent of the rotor weight.
13. Sample
A shaft carries two rotating masses of 1.5 kg and
Problem
0.5 kg, attached at radii 0.6 m and 1.2 m, respectively, from
the axis of the masses are shown in the figure below. Find
the required angular position and radius of rotation r of a
balance mass of 1 kg.
If no balance mass is used what is the out-of-
balance force on the shaft bearing at 120 rpm?
14. Sample
Problem Solution:
The mr values are 0.9 kg-m for A and 0.6 kg-m for B and
these are represented by oa and ab, respectively, in the
force polygon, figure b. The resultant out-of-balance mr
value is given by ob in direction o to b. From a scale
drawing:
ob = 1.31 kg-m
the equilibrant is equal and opposite to the out-of-balance
force, and since the mr value for the balance mass is:
1 x r kg-m
Therefore, for balance
1 x r = 1.31 and r = 1.31 m
Thus the radius of rotation of the balance mass is 1.31 m
15. Sample
Problem The balance mass must be positioned so that its inertia
force is acting in direction b to o, i.e. at an angle of 156°36’
to the radius of mass A, as shown in figure c. If no balance
mass is used
Out-of-balance force = ob x w2
= 1.31 x 2Л 120 kg-m/s2
60
= 207 N
16. Thank you
Static balance is keeping balanced while still and dynamic balance is keeping balance while moving .