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Airstroke/Airmount Brochure - 8 / 12 Pages

AIRMOUNT® ISOLATORS
Airmount® isolator Selection Procedure
Refer to the selection guide on this page for Airmount isolator capabilities.
1. LOAD CAPACITY
Select one or two Airmount isolators that can support the load at each mounting point. It is normally best to design for pressures in the 4 to 6 BAR range. Consider only the 1M1A and the single and double convoluted types at first. Please notice that in the range of 1 to 285 kN you will, in most cases, find both a single and double convoluted style part which will support the load.
2. DETERMINE ISOLATION EFFECTIVENESS
Locate the forced frequency on the vertical axis of the chart on page 9. Locate the natural frequencies of the parts selected above and find these values on the horizontal axis of the Isolation Chart. At the intersection of the forced frequency and natural frequency lines you will be able to determine the approximate percentage of isolation by comparing this point with the diagonal lines representing these percentages.
3. DETERMINE DESIGN HEIGHT
The Airmount isolator SHOULD BE USED AT THE DESIGN HEIGHT GIVEN. The double convoluted part is used at a design height somewhat higher than its single convolution equivalent. Make sure that the design height falls within the height restricͭtions. Also, the double convoluted part will show a higher percentage of isolation (less transmitted vibration) than the single convoluted air spring. The reason for this is that the double convoluted part has a greater internal volume of air than the single convoluted version of the same size. At disturbing frequencies in the 7 to 13 Hz range, the double convoluted part is a significantly better vibration isolator than the single convoluted part. At disturbing frequencies of 13 to 25 Hz the gap closes considerably. At frequencies of 25 Hz and above, the difference is negligible.
4. DETERMINE EXACT INTERNAL PRESSURE AND ISOLATION
EFFECTIVENESS
The chances are that your specific vibration problem does not fall neatly into the load and disturbing frequency criteria as presented in the selection guide. Therefore, once a preliminary part selection has been made, turn to the individual data page in the Engineering Manual and Design Guide for that part in order to determine the specific internal pressure required and the percentage of isolation attainable.
Style Number
Design Height (mm)
Load (at Design Height) at 7 BAR
(kg)
Natural Frequency (@ 5 BAR) fn(Hz)
% of Isolation at Forced Frequency
7 Hz 13 Hz
SHAPED SLEEVE
1M1A-0
65
254
3.5
92.8
1M1A-1
75
285
2.8
95.1
2M1A
DO NOT USE 2M1A AS AN AIRMOUNT ISOLATOR
2M2A
45 | 97 | 3.25 | - | 93.3
SINGLE CONVOLUTION
16
76
508
3.9
90.6
16ST
75
468
4.1
89.0
131
89
685
3.0
74.6
94.7
160
140
798
2.1
90.3
97.4
110
114
812
2.7
80.9
95.8
116
114
1071
2.7
80.9
95.8
116-1
140
1148
2.4
85.6
96.8
115
114
1365
2.7
80.4
95.7
19
127
2576
2.5
83.1
96.3
19-.75
140
2386
2.6
82.6
96.2
113
127
3992
2.4
85.6
96.8
113-1
140
4627
2.3
86.9
97.0
153-2
150
5768
2.1
90.1
97.3
119**
127
6586
2.2
87.4
97.1
121**
127
8369
2.4
85.4
96.7
126**
127
12832
2.3
87.2
97.1
138-1.5
152
18878
2.0
90.3
97.7
148-1
140
38646
2.0
90.3
97.7
DOUBLE CONVOLUTION
25
140
535
2.6
81.8
96.0
255-1.5
165
622
2.2
87.6
97.2
224
165
880
2.1
88.6
97.4
26
203
971
1.9
91.3
98.0
20
216
1234
1.9
91.3
98.0
20-2
254
1469
1.6
93.7
98.5
22
241
2449
1.8
92.1
98.1
22-1.5
267
2409
1.8
92.3
98.2
21
241
3778
1.8
92.6
98.3
21-2
267
4178
1.6
94.0
98.5
233-2
286
4498
1.4
95.2
98.8
28**
241
5498
1.7
92.8
98.3
203**
241
8568
1.6
93.9
98.5
29**
241
11499
1.6
94.2
98.6
200
241
15703
1.6
94.2
98.6
215
267
18588
1.4
95.2
98.8
248-2
279
36165
1.4
95.6
98.9
TRIPLE CONVOLUTION
352
343
2913
1.3
95.9
99.0
313
330
4064
1.4
95.5
98.9
333
373
4055
1.3
96.3
99.1
312**
330
6137
1.4
95.5
98.9
323**
330
8918
1.3
95.8
99.0
320**
356
12129
1.3
96.2
99.1
321
381
19005
1.2
96.8
99.2
348-3
381
37439
1.1
97.0
99.3
I
hͭZ
Z> O
ce < z <
(fi <
LU
(fi
z> ce o
LL LU
z
o I-
(fi
LU CC LL
I-_l Zi
(fi z o o
REVERSIBLE SLEEVE
1X84D-1
203
308
1.3
96.4
99.1
4001
140
172
1.7
93.2
98.4
7002
114
372
1.8
92.0
98.1
7010
203
367
1.1
97.0
99.3
7012
216
454
1.3
95.8
99.0
110/70
185
540
1.6
94.5
98.5
1T12E-3
267
349
1.3
96.2
99.1
1T14C-1
254
1461
1.4
95.2
98.8
1T14C-3
279
1470
1.3
96.4
99.1
1T14C-7
343
1470
1.1
97.4
99.4
1T15T-1
178
2490
2.0
90.3
97.7
1T15S-6
305
2422
1.2
96.5
99.1
1T15L-4
279
3143
1.4
95.5
98.9
1T15M-0
191
3171
1.6
93.9
98.5
1T15M-2
241
3407
1.4
95.0
98.8
1T15M-4
318
3252
1.3
96.3
99.1
1T15M-6
381
3175
1.1
97.1
99.3
1T15M-9
470
3230
1.0
97.7
99.4
1T19L-7
380
3951
1.2
96.8
99.2
1T19L-11
455
4853
1.0
97.6
99.4
*Do not inflate above 5 BAR. tExcept for 1X84D-1 and 1M1A.
** When using the rolled plate end closure option, add 17.5 mm to heights shown.
8
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