1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228 
Fodens Ltd comments.'–
Page 166
If you've noticed an error in this article please click here to report it so we can fix it.
Mr. Chisholm has rather missed the point in the design of this cab. One objective was to reduce the stress levels in the main structure of the cab and also to eliminate high frequency vibrations particularly in the unladen condition where the general performance of the cab and all the associated attachments (instruments. etc.) is improved. This is particularly important in many overseas operating conditions where often such trucks are operated for thousands of miles on corrugated roads and tracks.
From his comments it is obvious that Mr. Chisholm is only considering fundamental vertical vibrations whereas in fact one of the most critical features on shortwheelbase vehicles is to overcome pitching (back-slap) which is a fore and aft motion. A considerable amount of development work has been done on the suspension of this cab and subjectively the driver's comfort has been greatly improved. What we are doing is to supply two isolators, one to take care of horizontal vibrations and high frequency vertical vibrations and the other for low frequency vertical vibrations, and the effect in all types of service has shown the results to be exceptionally successful.