This Question Bank for Robotics Engineering is only for academic purpose and not for any commercial use. Students of Anna University and other Universities can use it for reference and knowledge.
Unit III - Solved Question Bank- Robotics Engineering -Sanjay Singh
This Question Bank for Robotics Engineering is only for academic purpose and not for any commercial use. Students of Anna University and other Universities can use it for reference and knowledge.
Robotics and Autoamtion_ manipulators, actuators and end effectorsJAIGANESH SEKAR
Construction of manipulators – manipulator dynamics and force control – electronic and pneumatic manipulator control circuits – end effectors – U various types of grippers – design considerations.
Unit III - Solved Question Bank- Robotics Engineering -Sanjay Singh
This Question Bank for Robotics Engineering is only for academic purpose and not for any commercial use. Students of Anna University and other Universities can use it for reference and knowledge.
Robotics and Autoamtion_ manipulators, actuators and end effectorsJAIGANESH SEKAR
Construction of manipulators – manipulator dynamics and force control – electronic and pneumatic manipulator control circuits – end effectors – U various types of grippers – design considerations.
Methods of robot programming
Leadthrough programming methods
A robot program as a path in space
Motion interpolation
WAIT, SIGNAL and DELAY commands
Branching
ROBOTICS-ROBOT KINEMATICS AND ROBOT PROGRAMMINGTAMILMECHKIT
Forward Kinematics, Inverse Kinematics and Difference; Forward Kinematics and Reverse Kinematics of manipulators with Two, Three Degrees of Freedom (in 2 Dimension), Four Degrees of freedom (in 3 Dimension) Jacobians, Velocity and Forces-Manipulator Dynamics, Trajectory Generator, Manipulator Mechanism Design-Derivations and problems. Lead through Programming, Robot programming Languages-VAL Programming-Motion Commands, Sensor Commands, End Effector commands and simple Programs
To make it serve itself for performing useful functions like approaching to work piece, automatic motion in workspace, robot programming is very important. Robot programming is important to coordinate various tasks & activities that needed in workspace. Coordination of robot is done by using various sensors & end effectors which can be coordinated by programs and simulation software’s.
This presentation deals with recent advances in industrial robots ¤t research in commanding industrial robot by human voice by university of coimbra
Unit IV Solved Question Bank- Robotics EngineeringSanjay Singh
This Question Bank for Robotics Engineering is only for academic purpose and not for any commercial use. Students of Anna University and other Universities can use it for reference and knowledge.
Unit v - Solved qb - Robotics EngineeringSanjay Singh
This Question Bank for Robotics Engineering is only for academic purpose and not for any commercial use. Students of Anna University and other Universities can use it for reference and knowledge.
Methods of robot programming
Leadthrough programming methods
A robot program as a path in space
Motion interpolation
WAIT, SIGNAL and DELAY commands
Branching
ROBOTICS-ROBOT KINEMATICS AND ROBOT PROGRAMMINGTAMILMECHKIT
Forward Kinematics, Inverse Kinematics and Difference; Forward Kinematics and Reverse Kinematics of manipulators with Two, Three Degrees of Freedom (in 2 Dimension), Four Degrees of freedom (in 3 Dimension) Jacobians, Velocity and Forces-Manipulator Dynamics, Trajectory Generator, Manipulator Mechanism Design-Derivations and problems. Lead through Programming, Robot programming Languages-VAL Programming-Motion Commands, Sensor Commands, End Effector commands and simple Programs
To make it serve itself for performing useful functions like approaching to work piece, automatic motion in workspace, robot programming is very important. Robot programming is important to coordinate various tasks & activities that needed in workspace. Coordination of robot is done by using various sensors & end effectors which can be coordinated by programs and simulation software’s.
This presentation deals with recent advances in industrial robots ¤t research in commanding industrial robot by human voice by university of coimbra
Unit IV Solved Question Bank- Robotics EngineeringSanjay Singh
This Question Bank for Robotics Engineering is only for academic purpose and not for any commercial use. Students of Anna University and other Universities can use it for reference and knowledge.
Unit v - Solved qb - Robotics EngineeringSanjay Singh
This Question Bank for Robotics Engineering is only for academic purpose and not for any commercial use. Students of Anna University and other Universities can use it for reference and knowledge.
An Improved Accurate Trajectory Control System for Industrial Hydraulic Robo...IJMER
A PC based control system was developed in this work to control a hydraulic pick and place robotic arm with a high tracking accuracy. The hydraulic arm was designed, constructed and controlled through an electronic driver circuit designed by the author. The tracking control system is driven by computer software, the commands of which are connected to the arm by means of a data acquisition card to read the rotational angles of its parts and to actuate the driver circuit of its hydraulic system. The present hydraulic robot arm is controlled to carry out desired pick and place tasks. A smart control software program was designed and constructed by the author using C# programming language. The present software program is designed as a Graphical User Interface application, GUI, and therefore it can be easily operated by non-expert users. Inverse kinematics formulas, derived by the author, are processed by the software to convert the coordinates of the initial and object tracking points from Cartesian to Polar systems as needed. Experimental runs were carried out to verify the effectiveness and the accuracy of the present tracking arm. Experiments showed that nine of ten trials were successful to attain a predesigned accurate pick and place task, which is a good percentage, confirmed the high accuracy of the present tracking system.
Digital Ebook A RESOURCE ON ELECTRIC LINEAR .docxcuddietheresa
Digital Ebook
A
RESOURCE
ON
ELECTRIC
LINEAR
ACTUATORS
What a machine designer needs to know
http://tolomatic.com
Contents
2
A RESOURCE ON ELECTRIC LINEAR ACTUATORS Table of Contents
I. WHY ELECTRIC ACTUATORS? EVALUATING
THE BASICS
a. What is a linear actuator?
b. Electric linear actuator advantages
II. ACCURACY AND REPEATABILITY: CRITICAL
CONCEPTS
III. SELECTING THE RIGHT ACTUATOR: ROD OR
RODLESS
a. Rod actuators
b. Rodless electromechanical actuators
c. Screw selection
d. Consider the environment
e. Comparing manufacturers’ specs
f. Calculating actuator life
IV. MOTOR SELECTION: STEPPER OR SERVO?
a. Stepper motors
b. Servo motors
c. Motor mounting
V. SYSTEM INSTALLATION: CONSIDERATIONS
a. Optimizing actuator alignment
b. Minimizing electrical noise
VI. ELECTRIC ACTUATOR APPLICATIONS:
IMPROVED EFFICIENCY
a. Automotive manufacturing
b. Process industries
c. Food and beverage processing
d. Material handling
VII. CONCLUSION: TOTAL COST OF OWNERSHIP
CONTRIBUTOR CREDITS
There were many talented Tolomatic
contributors responsible for the contents of this
ebook. Thank you to:
GARY ROSENGREN, director of engineering;
IGOR GLIKIN, senior mechanical engineer;
PATRICK HOBART, senior software
development engineer;
SCOTT KLAR, electrical engineer;
AARON DIETRICH, director of marketing;
RYAN KLEMETSON, target markets manager;
DAN CASS, director of business development;
RYAN BOURGOINE, engineering supervisor;
and all the support staff that helped produce
the materials contained in this e-book. We hope
you find the contents informative.
P.3
P.4
P.5
P.11
P.13
P.14
P.16
http://tolomatic.com
Why electric actuators? Evaluating the basics
COURTESY OF TOLOMATIC
I.
3
WHAT IS A LINEAR ACTUATOR?
A linear actuator is defined as a device that creates motion in a
straight line. These devices are used in automotive manufacturing,
process industries, food and beverage processing, material handling,
robotics, and in other places where linear motion is required.
Industrial applications use pneumatic-, hydraulic- and electric-
powered linear actuators. Pneumatic and hydraulic power
produce linear motion naturally so pneumatic and hydraulic
linear actuators (often called cylinders) can be fairly simple
devices. However, in electric-powered linear actuators an electric
motor’s rotary motion must be converted to linear motion
through a screw/nut system or a belt. This means electric linear
actuators are somewhat more complex devices than pneumatic
or hydraulic actuators but can offer significant advantages in
many applications.
ELECTRIC LINEAR ACTUATOR ADVANTAGES
The decision of whether to use an electric, pneumatic
or hydraulic linear actuator is a crucial one for engineers
when specifying a linear actuator. A pneumatic cylinder has
advantages — ease-of-use, lower cost — but carries with it
inefficiencies in operation with potential compressed air
lea ...
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology
A REVIEW :MODELLING OF BRUSHED DC MOTOR AND VARIOUS TYPE OF CONTROL METHODSJournal For Research
This Review Paper introducing the modeling of Brushed DC motor and different PID control techniques. A brushed DC motor is commutated an internally which is electric motor designed to be run by a direct current power supply. A Brushed motors were the first commercially important application for convert electric power to driving mechanical loads, and DC power distribution systems were used for more than 100 years to operate motors in commercial and industrial Applications. A conventional brushed DC Motor consist basically two parts,first one is the stationary body of the motor called the Stator and the other one is inner part which rotates producing the movement called the Rotor or“ Armature†for DC motors. For the motion control of DC motor in almost applications, PID controller is used. The PID controllers have a long history in control engineering and they have been proven to be robust, simple and stable for many real world applications. Roughly, P action is related to the present error, I action is based on the past history of error, and D action is related to the future behavior of the error. From estimation point of view P, D, and I correspond to filtering, smoothing and prediction problems respectively.This control mode is combination of the Proportional, the Integral, and the Derivative mode. This is most powerful but complex controller mode. It provides accurate and stable control of the three controller mode. It is recommended in system where the load changes frequently. The Three-term , PID controllers are probably the most widely used industrial controller. An Even complex industrial control systems may comprises a control network whose main control building block is a PID control module. The three-term PID controller has had a long history of use and has survived the changes of technology from the analogue era in to the digital computer control system age quite satisfactorily. It was the first controller to be mass produced for the high- range volume market that existed in the process industries.
Electro-Mechanical Actuator (EMA) is the key
component in the guidance systems of missiles to convert
electrical power into mechanical power. EMAs have shown
significant improvement in response times and are more reliable
compared to other actuators. This paper proposes a Simulink
model for a linear electromechanical actuator which is very efficient
and can withstand noise and disturbances. Electromechanical
actuators are mechanical actuators where the control handle has
been supplanted by an electric motor. This model is subjected to
sudden loads and disturbances and the precise actuation is
obtained within the specified settling time. The model is also
subjected to nonlinearities and the results were found out to be
competent.
Design and Simulation study of Electro-Mechanical Actuator for Missile Maneuv...SumanthKukutam
Electro-Mechanical Actuator (EMA) is the key component in the guidance systems of missiles to convert electrical power into mechanical power. EMAs have shown significant improvement in response times and are more reliable compared to other actuators. This paper proposes a Simulink model for linear electromechanical actuator which is very efficient and can withstand noise and disturbances. Electromechanical
actuators are mechanical actuators where the control handle has been supplanted by an electric motor. This model is subjected to sudden loads and disturbances and the precise actuation is obtained within the specified settling time. The model is also subjected to nonlinearities and the results were found out to be competent.
Design procedure of an electrohydraulic driveeSAT Journals
Abstract Aerodynamicists use wind tunnel to test models as well as for proposed aircraft components and engines. In order to keep these models fixed in place for testing, ground based equipment is essential. Electrohydraulic drives form the back bone of such type of mechanism which requires continuous motion for life time operations with controlled motion for start stop and bi-directional motion mechanisms. Focus of this paper is on systematic approach for optimal designing of a typical electrohydraulic drive that will provide roll motion to the testing model with emphasis on reliability of the system. This paper further highlights the design, selection, testing and qualification procedures of different elements of the drive and the electrohydraulic drive assembly as a whole. Keywords - Design, Develop, Electrohydraulic roll drive, Spindle.
Automation of Fixtures Using Hydraulic Power Pack for a Bogie UnderframeIOSR Journals
In this era of automation technologies manufacturing sectors have placed very high demands on fast and reliable production methods. This work is the evaluation & analysis of the existing clamping system. The current system uses manual clamping of fixtures for holding the work piece in the proper position while welding process is being done on the part. The evaluated system uses hydraulic vertical swing clamps for holding the work piece driven by hydraulic power pack. Thus the new system achieves automatic and simultaneous clamping of fixtures.
Proulsion I - SOLVED QUESTION BANK - RAMJET ENGINESanjay Singh
The material is only for academic purpose and for preparation of exams. Contents are copied from reference books. Not for revenue generation of any kind.
Rockets and missiles solved question bank - academic purpose onlySanjay Singh
The study material will be useful for aeronautical engineering students for preparation for their exams. It is made for academic purpose only and not for revenue generation of any kind. Rocket Propulsion Elements by Sutton is used for preparation of this QB.
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
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.
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!
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.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
Introduction to AI for Nonprofits with Tapp NetworkTechSoup
Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdf
Unit II Solved Question Bank - Robotics Engineering -
1. VMKV ENGINEERING COLLEGE, SALEM
AERONAUTICAL ENGINEERING COURSE
ELECTIVE – ROBOTICS ENGINEERING – QUESTION BANK 2012 REGULATION
UNIT II - END EFFECTORS AND CONTROL SYSTEMS
End effectors - classification - mechanical, magnetic, vacuum and adhesive gripper - gripper force analysis and
design. Robot control - unit control system concept - servo and non-servo control of robot joints, adaptive and
optimal control.
PART A
1. What is an end effector?
Ans. End effector is a device that is attached to the end of the wrist arm to perform specific task.
2. Classify end effectors with examples.
Ans. Gripper, Tools, Welding equipments, End of arm Tooling (EOAT)
3. What do you mean by gripper?
Ans. Gripper is the End effector which can hold or grasp the object.
4. Differentiate between internal grippers and external grippers.
Ans. In internal grippers, the finger pads are mounted on the inside of the fingers. This mounting
allows the pads to fit into the inside diameter of the part it must lift. The pads are pressed against the inside
wall of the part.
An external gripper is designed so that the finger pads press against the outside of the
component. Grips the exterior surface of the objects with closed fingers.
5. Define base and tool Coordinate system.
Ans. A tool coordinates definition system capable of easily obtaining a transformation matrix for
defining a tool coordinates system of a robot. The tool coordinates system at the 0° position of the
robot is rotated around each axis so that the tool coordinates system becomes parallel to a basecoordinates
system.
6. What are the types of Mechanical Grippers?
Ans. (i) Linkage actuation gripper (ii) Gear and rack actuation gripper
(iii) Cam actuated gripper (iv) Screw actuated gripper
7. List any two limitations of magnetic grippers.
Ans. (i) Residual magnetism (ii) Side slippage
(iii) More than one sheet will be lifted by the magnet from a stack
8. Give some examples of tool as robot End effector.
Ans. (i) Spot Welding Tools (ii) Arc welding Torch (iii) Spray painting nozzle (iv) Water jet cutting tool
9. List any four important factors to be considered in the selection and design of grippers.
Ans. (i) The gripper must have the ability to reach the surface of a work part.
(ii) The change in work part size must be accounted for providing accurate positioning.
(iii) During machining operations, there will be a change in the work part size. As a result, the
gripper must be designed to hold a work part even when the size is varied.
(iv) The gripper must not create any sort of distort and scratch in the fragile work parts.
10. List out the types of Drive systems used in Robots.
Ans. (i) Electric motors like: Servomotors, Stepper motors
(ii) Hydraulic actuators
(iii) Pneumatic actuators
2. VMKV ENGINEERING COLLEGE, SALEM
AERONAUTICAL ENGINEERING COURSE
ELECTIVE – ROBOTICS ENGINEERING – QUESTION BANK 2012 REGULATION
11. What is a rotation matrix? Write basic rotation matrices.
12. Name some feedback devices used in robotics.
Ans. (i) Potentiometer (ii) Resolver (iii) Encoder
13. Write the characteristics of actuating systems.
Ans. (i) Weight (ii) Power-to-weight ratio (iii) Operating Pressure (iv) Stiffness Vs. Compliance
14. List any two unique features of a stepper motor.
Ans. (i) Moves in known angle of rotation. (ii) Position feedback is not necessary.
(iii) Rotation of the shaft by rotation of the magnetic field.
15. What are the types of encoders?
Ans. (a) Linear encoder
(b) Rotary encoder
(i) Absolute encoder
(ii) Incremental encoder
16. What do you mean by a composite rotation matrix?
Ans. Basic rotation matrices can be multiplied together to represent a sequence of finite rotations about
the principal axes of the OXYZ coordinate systems to obtain a resultant composite 3 X 3 rotation matrix.
17. State the Euler angles used in rotation matrix.
Ans. φ, θ, and ψ are the Euler angles used in rotation matrix in described in Eulerian three systems.
18. Write basic homogenous rotation matrix.
Ans.
19. Write basic homogenous translation matrix.
Ans.
3. VMKV ENGINEERING COLLEGE, SALEM
AERONAUTICAL ENGINEERING COURSE
ELECTIVE – ROBOTICS ENGINEERING – QUESTION BANK 2012 REGULATION
20. State Denavit – Hartenberg parameter.
Ans. To describe the translational and rotational relationships between adjacent links, Denavit and
Hartenberg (1955) proposed a matrix method of systematically establishing a coordinate system (body
attached frame) to each link of an articulated chain. The D-H representation results in a 4 X 4 homogenous
transformation matrix representing each link’s coordinate system at the joint with respect to the previous
link’s coordinate system.
4. VMKV ENGINEERING COLLEGE, SALEM
AERONAUTICAL ENGINEERING COURSE
ELECTIVE – ROBOTICS ENGINEERING – QUESTION BANK 2012 REGULATION
PART B
1. Describe five types of mechanical joints for robots with neat sketches.
5. VMKV ENGINEERING COLLEGE, SALEM
AERONAUTICAL ENGINEERING COURSE
ELECTIVE – ROBOTICS ENGINEERING – QUESTION BANK 2012 REGULATION
2. Describe five common body-and-arm configurations with neat sketches.
Ans. Common Body-and-Arm configurations
6. VMKV ENGINEERING COLLEGE, SALEM
AERONAUTICAL ENGINEERING COURSE
ELECTIVE – ROBOTICS ENGINEERING – QUESTION BANK 2012 REGULATION
3. Describe PUMA 560 manipulator and obtain link transformation matrix from D-H table.
Ans.
7. VMKV ENGINEERING COLLEGE, SALEM
AERONAUTICAL ENGINEERING COURSE
ELECTIVE – ROBOTICS ENGINEERING – QUESTION BANK 2012 REGULATION
8. VMKV ENGINEERING COLLEGE, SALEM
AERONAUTICAL ENGINEERING COURSE
ELECTIVE – ROBOTICS ENGINEERING – QUESTION BANK 2012 REGULATION
4. Describe in detail the drive systems used to actuate robotic joints.
Ans. One common method of classifying robots is the type of drive required by the actuators.
• Electrical actuators use electric power.
• Pneumatic actuators use pneumatic (air) power.
• Hydraulic actuators use hydraulic (fluid) power.
Electric Drive
Three types of motors are commonly used for electric actuator drives:
AC servo motors, DC servo motors, and Stepper Motors.
Both AC and DC servomotors have built-in methods for controlling exact position. Many newer
robots use servo motors rather than hydraulic or pneumatic ones. Small and medium-size robots commonly
use DC servo motors. Because of their high torque capabilities, AC servo motors are found in heavy-duty
robots.
A stepper motor is an incrementally controlled dc motor. Stepper motors are rarely used in
commercial industrial robots, but are commonly found in educational robots.
Conventional, electric-drive motors are quiet, simple, and can be used in clean-air environments.
Robots that use electric actuator drives require less floor space, and their energy source is readily available.
However, the conventionally geared drive causes problems of backlash, friction, compliance, and wear.
These problems cause inaccuracy, poor dynamic response, need for regular maintenance, poor torque
control capability, and limited maximum speed on longer moves. Loads that are heavy enough to stall
(stop) the motor can cause damage.
Conventional electric-drive motors also have poor output power compared to their weight. This
means that a larger, heavier motor must be mounted on the robot arm when a large amount of torque is
needed.
9. VMKV ENGINEERING COLLEGE, SALEM
AERONAUTICAL ENGINEERING COURSE
ELECTIVE – ROBOTICS ENGINEERING – QUESTION BANK 2012 REGULATION
Hydraulic Drive
Many earlier robots were driven by hydraulic actuator drives. A hydraulic drive system uses fluid
and consists of a pump connected to a reservoir tank, control valves, and a hydraulic actuator. Hydraulic
drive systems provide both linear and rotary motion using a much simpler arrangement than conventional
electric-drive systems. The storage tank supplies a large amount of instant power, which is not available
from electric-drive systems.
Hydraulic actuator drives have several advantages. They provide precise motion control over a wide
range of speeds. They can handle heavy loads on the end of the manipulator arm, can be used around
highly explosive materials, and are not easily damaged when quickly stopped while carrying a heavy load.
However, they are expensive to purchase and maintain and are not energy efficient.
Hydraulic actuator drivers are also noisier than electric-drive actuators and are not recommended
for clean-room environments due to the possibility of hydraulic fluid leaks.
Pneumatic Drive
Pneumatic drive systems make use of air-driven actuators. Since air is also a fluid, many of the
same principles that apply to hydraulic systems are applicable to pneumatic systems. Pneumatic and
hydraulic motors and cylinders are very similar. Since most industrial plants have a compressed air system
running throughout assembly areas, air is an economical and readily available energy source. This makes
the installation of robots that use pneumatic actuator drives easier and less costly than that of hydraulic
robots. For lightweight pick-and-place applications that require both speed and accuracy, a pneumatic robot
is potentially a good choice.
Pneumatic actuator drives work at high speeds and are most useful for small-to-medium loads.
They are economical to operate and maintain and can be used in explosive atmospheres. However, since air
is compressible, precise placement and positioning require additional components to achieve the smooth
control possible with a hydraulic system.
It is also difficult to keep the air as clean and dry as the control system requires. Robots that use
pneumatic actuator drives are noisy and vibrate as the air cylinders and motors stop.
5. Describe in detail the different types of possible control for joint movements.
Ans. Types of possible control for joint movements are as follows:
10. VMKV ENGINEERING COLLEGE, SALEM
AERONAUTICAL ENGINEERING COURSE
ELECTIVE – ROBOTICS ENGINEERING – QUESTION BANK 2012 REGULATION
11. VMKV ENGINEERING COLLEGE, SALEM
AERONAUTICAL ENGINEERING COURSE
ELECTIVE – ROBOTICS ENGINEERING – QUESTION BANK 2012 REGULATION
6. (i)Derive a 3 X 3 rotation matrixRx,αabout the OX axis with ‘α’ angle.Given two points auvw= (4,3,2)T
and
buvw= (6,2,4)T
with respect to therotated OUVWcoordinate system, determine the corresponding points axyz,
bxyzwith respect to the reference coordinate system if it has been rotated 600
about the OZ axis.
Ans.
(ii)Derive a 3 X 3 rotation matrix Rx,αabout the OY axis with ‘φ’ angle. axyz= (4,3,2)T
and bxyz= (6,2,4)T
are the coordinates with respect to the reference coordinate system, determine the corresponding points
auvwand buvwwith respect to therotated OUVWcoordinate system if it has been rotated 600
about the OZ
axis.
12. VMKV ENGINEERING COLLEGE, SALEM
AERONAUTICAL ENGINEERING COURSE
ELECTIVE – ROBOTICS ENGINEERING – QUESTION BANK 2012 REGULATION
7. Describe SCARA manipulator and obtain link transformation matrix from D-H table.
Ans.
13. VMKV ENGINEERING COLLEGE, SALEM
AERONAUTICAL ENGINEERING COURSE
ELECTIVE – ROBOTICS ENGINEERING – QUESTION BANK 2012 REGULATION
14. VMKV ENGINEERING COLLEGE, SALEM
AERONAUTICAL ENGINEERING COURSE
ELECTIVE – ROBOTICS ENGINEERING – QUESTION BANK 2012 REGULATION
8. Derive a 3 X 3 rotation matrix Rφ,θ,Ψ with Euler angles representation.If the OU, OV, andOWcoordinate
axes were rotated with ‘α’ angle about the OX axis, what would the representation of the coordinate axes of
the reference frame be in terms of the rotated coordinate system OUVW.
Ans. Express Rφ,θ,Ψ with respect to System I and System II as derived in class.
9. Determine a transformation ‘T’ matrix that represents a rotation of ‘α’ angle about the OX axis, followed
by a translation of ‘b’ units along the rotated OV axis.
15. VMKV ENGINEERING COLLEGE, SALEM
AERONAUTICAL ENGINEERING COURSE
ELECTIVE – ROBOTICS ENGINEERING – QUESTION BANK 2012 REGULATION
Ans.
10. Find a homogenous transformation ‘T’ matrix that represents a rotation of ‘α’ angle about the OX axis,
followed by a translation of ‘a’ units along the OX axis, followed by a translation of ‘d’ units along the OZ
axis, followed by a rotation of ‘θ’ angle about the OZ axis.
16. VMKV ENGINEERING COLLEGE, SALEM
AERONAUTICAL ENGINEERING COURSE
ELECTIVE – ROBOTICS ENGINEERING – QUESTION BANK 2012 REGULATION