Authors: Vladimir A. Prourzin
Addresses: Institute of Problems in Mechanical Engineering, Russian Academy of Sciences, Bolshoi 61, V. O., Saint-Petersburg, 199178, Russia
Abstract: The general approach to the description of dynamic models of reliability is offered for variable loads. The approach is based on a general physical principle of reliability offered by us for dynamic systems. The dynamic system presents a change of vector of state variables of a system, depending on initial states and loads. The physical principle of reliability postulates existence of such set of state variables for which reliability of an engineering system at current time is determined only by current values of these variables and does not depend on their previous history. As consequence, the non-negative hazard of failure function is defined in the state system space. As a result, examination of reliability of an engineering system with variable loads is reduced to solution of ordinary differential equation system. Expressions for reliability indexes are obtained. Results of the work can have applications in the reliability, safety and risk theory, in accelerated tests, in the area of fatigue damage accumulations at variable loads, in diagnostics, in medicine.
Keywords: reliability; physical principle; variable loads; dynamic model; diagnostic variables; accelerated tests; physics of failures; damage accumulation; heat ageing of a winding insulation.
International Journal of Risk Assessment and Management, 2017 Vol.20 No.4, pp.322 - 332
Received: 24 Jun 2016
Accepted: 25 Nov 2016
Published online: 07 Nov 2017 *