'U' BRACKET FOR RENIFORCEMENT OF STANDARD AND NON STANDARD ATR SIZE AVIONICS MOUNTING TRAY

摘要

pThe joint at rear end of the Avionics mounting tray should be high enough to withstand to the vibration and shock loading , especially in arrestor landing test. Mounting tray carries two locating pins/dowel pins at this side through which total induced vibration or shock loading transferred to the tray at rear side. The total induced forces are concentrated at these two pins only. Therefore the joint and bearing member to which these pins are fixed should also have enough strength to resist the coming forces especially in Arrestor landing shock test. The 'U' Bracket is designed for any ATR sized and non ATR sized Avionics mounting tray is to reinforce the joint at which it is fixed. The geometrical shape 'U' is made to increase the Section Modulus of the bracket to withstand forces in lateral direction.'U' shaped bracket riveted at the rear side of the mounting tray increases the strength of the joint and to eliminate the welded joint. It has two flanges at both ends in addition to the 'U' shaped bend. The bracket is made of SS-304 grade sheet of 1 mm thickness with proper bending radii and corner relief for minimum stress concentration. Use of stainless steel provides harder bearing area to the locating pin/ dowel pins. The rear side of the mounting tray is formed to its shape with lapping of sheets. The pilot holes of diameter 2.1mm are drilled initially, through which rivets pass, on mounting tray and the 'U' bracket. The bracket is placed at the appropriate position and clamped temporarily, then enlarge the holes to suit to the size of the rivet. Suitable rivets are riveted and complete the joint with suitable head forming tool./p