文档介绍：Available online at hanism
and
Machine Theory
Mechanism and Machine Theory 43 (2008) 1625–1638
ate/mechmt
Dynamic analysis of the reheat-stop-valve mechanism
with revolute clearance joint in consideration of thermal effect
Shi Bing *, Jin Ye
819# Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai 200240, China
Received 14 June 2007; received in revised form 21 November 2007; accepted 2 December 2007
Available online 28 January 2008
Abstract
The dynamic analysis of the reheat-stop-valve mechanism with revolute clearance joint is presented in this work. The
effect of joint clearance variation induced by the manufacturing tolerance ponents is bined with the
thermal influence of the high temperature steam in working condition. It is shown that by increasing bined clear-
ance of the revolute joint, a favorable reduction of the friction torque between the bush and the valve shaft can be obtained
for normal operation conditions of the reheat-stop-valve mechanism. However, if the temperature of steam reaches to
650 °C, the friction torque between the bush and the valve shaft es larger and the sticking phenomena exists. Based
on the numerical results, several design mendations to the partitioning engineer are advanced at the end of the paper.
Ó 2007 Elsevier Ltd. All rights reserved.
Keywords: Reheat-stop-valve mechanism; Revolute clearance joint; Multibody dynamics; Contact analysis; Thermal behavior
1. Introduction
The reheat-stop-valve mechanism, which controls the high temperature and large pressure inlet steam, is a
ponent of steam turbine. The schematic graphic of the reheat-stop-valve is shown in Fig. 1. The input
motion applied by the driver at the handspike is transmitted through the connecting lever and the motion con-
trol linkage (. the pole link, pin link, connecting rod, connecting tie-in, springs assembly) to the valve shaft
and bush-that is the revolute joint with clearance.
In working condition, there is a th