1. The document discusses the selection and design of steel wire ropes and drums used for hoisting machinery. It provides formulas to determine the minimum rope diameter based on factors like rope construction and tension.
2. Formulas are also given to calculate the diameter of rope sheaves and drums based on the rope diameter and load. Design considerations for drums include providing helical grooves to prevent rope jamming.
3. An example problem demonstrates using the formulas to select an appropriate steel wire rope and design the drum and sheaves for an overhead crane that lifts a 10,000 kg load over 8 meters.
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Pompa adalah salah satu mesin fluida yang termasuk dalam golongan mesin kerja. Pompa berfungsi untuk memindahkan zat cair dari tempat yang rendah ke tempat yang lebih tinggi karena adanya perbedaan tekanan
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Spring is an elastic body whose function is to distort when loaded and to recover its original shape when the load is removed.
APPLICATION OF SPRINGS
To apply forces as in brakes, clutches and spring loaded valves.
To store energy as in watches, toys.
To measure forces as in spring balance and engine indicators.
To cushion, absorb or control energy due to either shock or vibration as in car.The material of the spring should have
high fatigue strength,
high ductility,
high resilience and
creep resistant.
It largely depends upon the size and service.
The strength of the wires varies with size, smaller size wires have greater strength and less ductility, due to the greater degree of cold working.
Severe service means rapid continuous loading where the ratio of minimum to maximum load (or stress) is one-half or less, as in automotive valve springs.
Average service includes the same stress range as in severe service but with only intermittent operation, as in engine governor springs and automobile suspension springs.
Light service includes springs subjected to loads that are static or very infrequently varied, as in safety valve springs.
The springs are mostly made from oil-tempered carbon steel wires containing 0.60 to 0.70 per cent carbon and 0.60 to 1.0 per cent manganese.
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Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
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1. Selecting Steel Wire Ropes (Pemiliha/perencanaan Kawat baja)
1. Determine the ratio Dmin/d of every pulley system from the table (the values
are depending on the number of bents).
Diameter of the rope is expressed by the formula:
√ (9)
Where: δ = diameter of one wire
i = number of wires in the rope
2. The stress in a loaded rope is:
(10)
Where:
σb=ultimate breaking strength of the rope (kg/cm2
)/kekuatan
K = Factor of safety/ faktor keamanan
S = Tension of the rope (kg)/beban tali
F = Coss-section area of the rope (cm2
)
E’ = 3/8 E (Elastic modulus --- kg/cm2
)
Transforming formula (10) we obtain:
√
(11)
For ropes most frequently used in hoisting machinery are the ropes with 114,
222, and 342 wires.
For the rope with 222 wire, formula (11) becomes (E = 2.100.000 kg/cm2
)
(cm2
)
2. Maximum permissible tension in the rope is:
(12)
Where: S = maximum permissible tension (kg)
P = actual breaking strength of the rope (kg)
K = factor of safety
Maximum working tension in the rope parts (Sw) is obtained from the formula:
Where: Q = Load being raised (kg)
n = number of rope parts
η = pulley efficiency (Tabel 8)
η1 = rope stiffness efficiency ( 0.98)
3. Determination the number of bends (jumlah belokan tali):
1. Number of bends in a pulley system with one movable pulley
One bends is assumed to mean the transition of the rope from its
straight position into a bent one, or from a bent position into a straight
one. Reverse bending is count double.
4. 2. Number of bends in a pulley system with multiple pulley
Number of bends = 3
In determining the number of bends for multiple pulleys, the
compensating pulley is not considered since it remains stationery when
the load is being raised or lowered.
5.
6. I. Design of Rope Sheaves (Perancangan Alur Puli)
Rope sheaves (alur pulli) for steel wire ropes for various rope diameters is
illustrated in tabel 16 bellows:
Rope sheaves is illustrated in figure bellow. Figure 54 (a) Large sheaves with ribs
or holes, (b) welded rope sheaves (alur pulli yang dilas)
7. For compensating sheaves (Figure 55), its diameter may be taken 40 percent
smaller than the diameter of the sheaves carrying the load (diameter puli kecil
adalah 40 persen lebih kecil dari puli beban).
The ratio between the hub length and the diameter of the axle is usually taken
within the range (l/d = 1,5 to 1,8).
The unit pressure in the sheaves is:
Where: l = length of the bussing (lebar puli)
D = diameter of the sheave axle (diameter poros puli)
Q = load (beban)
Unit pressure should not exceed the following values:
v (m/s) 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1,0 1,1 1,2 1,3 1,4 1,5
p (kg/cm2
) 75 70 66 62 60 57 55 54 53 52 51 50 49 48 47
8. II. Design of Rope Drums
Drums for steel wire rope are made of cast iron. The drum diameter depens on
the diameter of the rope. With a power drive the drum should always be provided
with helical grooves (alur ulir) so that the rope winds up uniformly (melengkung
secara merata) and is less subject to wear (tidak cepat aus) (Fig 57a).
The radius of the helical grooves should be selected so as to prevent jamming of
the rope (the standard of the deep grooves for drums is listed in tabel 17).
9. There are 2 types of drum:
1. Drums with one coiling rope have only one helix (right hand)
2. Drums designed for two rope member are provided with two helices (right
hand and left hand).
The number of turn (jumlah lilitan) for one rope member is:
Where: i = transmission ratio of pulley system
D = drum diameter
H = height of the load rise
Length of the helix on the drum (panjang lilitan/alur ulir) is:
l = z s
Full length of the drum:
1. For one coiling rope is: ( )
2. For two coiling rope is: ( )
Maximum compressive stress at the inner surface of the drum is:
Where: S = rope load
w = wall thickness of the drum (tebal drum) = 0,02D + (0,6 ÷ 1 ) cm
s = pitch length (lebar pich/lebar antar alur)
l1 = jarak antara ujung alur kiri dan kanan pada drum (l1 = 0,25÷0,5 D)
10. Example problem:
Sebuah electric overhead crane seperti gambar bekerja pada level medium duty
dipakai mengangkat beban total Q = 10.000 kg (beban angkat + berat alat kait)
dengan tinggi angkat H = 8 m. Jumlah tali penahan beban (rope parts) z = 6,
efiseinsi total dari sistem puli adalah η =0,94. Bila tali yang dipilih adalah tipe
Cross lay rope dengan jumlah kawat 222 buah, faktor keamanan K = 4 , kekuatan
putus tali σb = 15.000 kg/cm2
dan E = 210 MPa. Tentukan:
a. Diameter minimum tali kawat baja yang digunakan.
b. Diameter drum, puli utama ,dan puli pembantu (compensating pulley).
c. Jari-jari alur drum dan besarnya pitch alur drum.
d. Jumlah lilitan/alur pada drum.
e. Panjang total drum
Jawab:
Beban pada setiap tali (tension in the rope) adalah:
Jumlah belokan pada sistem puli adalah n = 5. Dari tabel 7 untuk n = 5 didapat
11. Dmin/d = 26,5
a. Luas penampang tali minimum (dari rumus 13) didapat:
Diameter tali minimum adalah:
√
b. Diameter minimal drum dan puli utama adalah:
D = 26,5 d = 26,5 x 10 mm = 265 mm (Bisa dipilih D = 300 mm)
Diameter puli pembantu (compensating pulley) adalah:
D1 = 0,6 x D = 0,6 x 300 mm = 180 mm (Bisa dipilih D1 = 200 mm)
c. Jari-jari alur drum dan besarnya pitch (dari tabel 17) adalah:
r1 = 7 mm (dipilih dari besarnya diameter tali d = 11 mm)
s1 = 13 mm
d. Jumlah lilitan/alur pada pada masing-masing sisi drum:
e. Panjang total drum
( ) ( )