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					         BTEC HIGHER NATIONALS- APPLIED PNEUMATICS AND HYDRAULICS H1

                                            ASSIGNMENT
                                      FLUID POWER STANDARDS


TARGET SUBMISSION DATE:

NAME:

I agree to the assessment as contained in this assignment. I confirm that the work submitted is my own work.

Date Issued:


Signature:                                                        Date submitted:


This assignment will be used to grade the sections highlighted.

                                             PASS CRITERIA

                                                Assessment Criteria for a pass                     Achieved
                                     •   Recognise and describe given fluid power symbols.
Outcome 1
                                     •   Review fluid power diagrams and report on the design
Investigate    fluid    power            of either a pneumatic or hydraulic multi-actuator
diagrams                                 sequential operation using a minimum of four
                                         actuators.

                                      • Review fluid power diagrams and report on the design
                                        of either a pneumatic or hydraulic reversible rotary
                                        actuation with speed control in both directions.

                                     •   Identify and describe the features of given items of
OUTCOME 2                                pneumatic and hydraulic equipment.
                                     •   Analyse the performance characteristics of given
Analyse the construction and             pneumatic and hydraulic equipment.
operation of pneumatic and
hydraulic        components,
equipment and plant.

                                     •   Design and draw either a circuit for either a pneumatic
OUTCOME 3                                or hydraulic multi-actuator sequential operation,
                                         including emergency stop functions.
Design      pneumatic      and       •   Design and draw either a hydraulic or pneumatic rotary
hydraulic circuits                       actuation circuit illustrating speed control in both
                                         directions.
                                     •   Design and draw either an ‘electro-pneumatic’ or
                                         ‘electro-hydraulic’ circuit arrangement.
                                     •   Design and draw an emergency ‘fail safe’ circuit for
                                         either a pneumatic or hydraulic application.
                                     •   Justify the use of fluid power technology for a given
OUTCOME 4                                industrial application.
                                     •   Describe the technical requirements and commercial
Evaluates            industrial          aspects for a proposed system.
applications of    pneumatics        •   Identify appropriate health safety requirements for the
and hydraulics                           design, installation, maintenance and use of fluid
                                         power equipment.
                                            MERIT

                                                     Descriptor                                 Achieve
                                                                                                  d
• identify and apply         •   effective judgments have been made
  strategies to find         •   complex problems with more than one variable have been
  appropriate solutions.         explored
                             •   an effective approach to study and research has been
                                 applied

• select/design and apply    •   relevant theories and techniques have been applied.
  appropriate methods/
                             •   a range of methods and techniques have been applied.
  techniques
                             •   a range of sources of information has been used.
                             •   the selection of methods and techniques/sources has been
                                 justified
                             •   the design of methods/techniques has been justified
                             •   complex information/data has been synthesized and
                                 processed
                             •   appropriate learning methods/techniques have been
                                 applied
• present and                •   the appropriate structure and approach has been used
  communicate the
  appropriate findings       •   coherent, logical development of principles/concepts for
                                 intended audience
                             •   a range of methods of presentation have been used and
                                 technical language has been accurately used
                             •   communication has taken place in familiar and unfamiliar
                                 contexts
                             •   the communication is appropriate for familiar and
                                 unfamiliar audiences and appropriate media have been
                                 used

                                       DISTINCTION

• use critical reflection    •   conclusions have been arrived at through synthesis of
  to evaluate own work           ideas and have been justified
  and justify valid          •   the validity of results has been evaluated using defined
  conclusions                    criteria
                             •   self-criticism of approach has taken place
                             •   realistic improvements have been proposed against
                                 defined characteristics for success
• take responsibility for    •   autonomy/independence has been demonstrated
  managing             and   •   substantial activities, projects or investigations have been
  organising activities          planned, managed and organised
                             •   activities have been managed
                             •   the unforeseen has been accommodated
                             •   the importance of interdependence has been recognised
                                 and achieved
• demonstrate                •   ideas have been generated and decisions taken
  convergent/lateral/        •   self-evaluation has taken place
  creative thinking          •   convergent and lateral thinking have been applied

                             •   problems have been solved
                             •   innovation and creative thought have been applied
                             •   receptiveness to new ideas is evident
                             •   effective thinking has taken place in unfamiliar contexts
Feedback Comments:




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The script has been internally verified by ....................................................... Date .........................................
GENERAL INTRODUCTION TO ASSESSMENT STATEGY


Throughout the module you should do the following.

   •   Study relevant course notes.

   •   Study the recommended textbooks.

   •   Use the standards publications available in the library.

   •   Make use of suitable web sites.

   •   Make use of journals on fluid power stored in room B1

   •   Make use of manufacturers catalogues. (RS, NORGREN, REXROTH and so on stored in rooms B1
       and A1).

   •   Make use of the standard information pack from the British Fluid Power Association.

In the design parts, you should use the computer software “PneuSim Pro”. The context help contains
diagrams, pictures and symbols.

Your assignment should be structured with headings and subheadings. The work must be your own. Copies
of pages from the internet or from any other source should only be added as reference material. This should
be clearly identified and cross-referenced in your text (e.g. diagram numbers and appendix numbers).

You may use computer packages such as “word” to produce your work and scan in pictures. You may do the
work in hand writing and paste in pictures and diagrams. What ever method you use, make sure that the work
is identifiable as your own unique style and your research.
                           PART 1     HARDWARE AND BASIC CIRCUITS

Part 1 is made from a series of worksheets that enable you to demonstrate knowledge and ability of hydraulic
hardware and circuits. It also includes some work on pneumatics.

You should have each worksheet verified and marked as soon as you complete them. On completion of all
the work, you should present all the worksheets to your lecturer in a portfolio for grading. Guidelines of
grading are also given on each worksheet where appropriate.


 THE WORKSHEETS BELOW HAVE BEEN INCORPORATED IN THE TUTORIALS AS SELF
                       ASSESSMENT EXERCISES



W.S.1   INTRODUCTION TO FLUID POWER

W.S.2 HYDRAULIC PUMPS AND MOTORS

W.S.3 DIRECTIONAL CONTROL VALVES

W.S.4. ACCUMULATORS

W.S.5 CYLINDERS

W.S.6 FILTERS, FLUIDS, SEALS AND POWER PACKS
                                       PART 2 AIR COMPRESSORS

NOTE: If you have completed the section on air compressors in the Thermodynamics module, you may
claim exemption from part 2.

A reciprocating air compressor has an ideal cycle as shown. You will be allotted a set of data from the list
                                                 below. Calculate

                                                   1.    The work done per cycle.
                                                   2.    The work done per second (power).
                                                   3.    The volumetric efficiency
                                                   4.    The isothermal efficiency.
                                                   5.    The Free Air Delivery.



                                                     The induction is carried out at atmospheric pressure taken
                                                     as 100kPa. You will need to determine the volume at
point 4 of the cycle in order to complete this section.

Formulae
                                                          ⎛ n ⎞ ⎧ n −1 ⎫
Work done per cycle                                   W =⎜        ⎟ p1 ⎨rp n − 1⎬[V1 − V4 ]
                                                          ⎝ n −1⎠ ⎩             ⎭
                                                              ⎛p ⎞
Isothermal work done per cycle                        W = l n ⎜ 2 ⎟( p1V1 − p3V3 )
                                                              ⎜p ⎟
                                                              ⎝ 1⎠
Compression process                                   p 2V2n = p1V1n
Expansion process                                     p3V3n = p 4V4n

Other formulae may be found in your notes.

STUDENT             V1 dm3       V3 cm3      p1 kPa         p2 kPa        n        N rev/min.

1                   1            60          100            400           1.2         400
2                   0.9          50          100            500           1.25        360
3                   1.5          100         100            450           1.28        450
4                   2            120         100            550           1.3         500
5                   0.8          40          100            600           1.18        600
6                   1.5          120         100            300           1.22        420
7                   1.2          90          100            350           1.27        460



PART 3                    THE PIPE-WORK SYSTEM

The air from the compressor is stored in a tank. The tank supplies air to a main pipe. Assuming a maximum
velocity in the pipe of 8 m/s, determine a suitable pipe bore to carry all the air produced by the compressor.

Explain how the air would be distributed to user points in the workshop and the equipment needed to ensure
that it is supplied in a fit state for use.

				
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