Study on Reliability of Mechanical Systems Based on Petri Nets and Failure Dependence

2012 ◽  
Vol 538-541 ◽  
pp. 2892-2896
Author(s):  
Qi Guo Hu
Keyword(s):  
Petri Nets ◽  
Mechanical System ◽  
Intermediate State ◽  
Systems Analysis ◽  
System Reliability ◽  
Mechanical Systems ◽  
Complex Relationship ◽  
Intersection Operation ◽  
Failure Dependence ◽  
Stochastic Event

Mechanical systems is vulnerable to be influenced of its structure and human factors for its subsystems, components and the complex relationship between each unit, causing the mechanical systems to be failed, which severely affects the reliability of the mechanical systems. based on Petri nets models of mechanical systems analysis, from safety, intermediate and failure three aspects, 3-level working model of “safety-intermediate-failure” is introduced to reflect the reliability (functioning fully) of mechanical systems, intermediary transition between reliable and failure, failure (can not work). Through using the union and intersection operation of stochastic event, and considering the different values of the related failure parameters among basic events which impacts on the reliability of mechanical system, eventually the calculation of mechanical system reliability vector with the intermediate state is established.

Reliability Simulation and Prediction of Mechanical Equipment for Maintenance

2010 ◽  
Vol 139-141 ◽  
pp. 1060-1063
Author(s):  
Liang Pei Huang ◽  
Zheng Li Gong ◽  
Wen Hui Yue
Keyword(s):  
Service Life ◽  
Mechanical System ◽  
Density Function ◽  
System Reliability ◽  
Mechanical Systems ◽  
Mechanical Equipment ◽  
Time To Failure ◽  
Reliability Model ◽  
Estimate Reliability ◽  
Maintenance Policies

The mechanical equipment faults result from parts failure in the period of service time, due to reassembly and maintenance, the reliability model for mechanical equipment is broken, so it is necessary to research and estimate the safety reliability of mechanical system. Based on the time-to-failure density function of parts, the mechanical system reliability model is constructed to track the change course of age structure of part population for the mechanical systems that are reassembled and maintained. By means of simulation of the system reliability model, concerned parameters with mechanical systems service life are defined, it is discussed how the time-to-failure density function have influence on the service life for mechanical systems undergoing reassembly and maintenance. It is significant to estimate reliability and failure rate of systems and to establish reasonable maintenance policies.

scholarly journals Reliability Assessment of Mechanical Systems

1996 ◽  
Vol 210 (3) ◽  
pp. 205-216 ◽  
Author(s):  
T R Moss ◽  
J D Andrews
Keyword(s):  
Mechanical System ◽  
System Reliability ◽  
Reliability Assessment ◽  
Mechanical Systems ◽  
Exact Science ◽  
Considerable Uncertainty ◽  
General Methodology ◽  
Process Plant

The assessment of mechanical systems is not an exact science and predictions can be subject to considerable uncertainty. In this paper the particular problems of mechanical system reliability assessment are discussed and a general methodology presented based on experience from availability studies carried out on offshore and onshore process plant.

Reliability Modeling and Simulation of Mechanical Equipment Undergoing Maintenance

2010 ◽  
Vol 34-35 ◽  
pp. 1211-1216
Author(s):  
Liang Pei Huang ◽  
Wen Hui Yue ◽  
Zheng Li Gong
Keyword(s):  
Service Life ◽  
Mechanical System ◽  
Density Function ◽  
System Reliability ◽  
Mechanical Systems ◽  
Mechanical Equipment ◽  
Time To Failure ◽  
Reliability Model ◽  
Reliability Modeling ◽  
Maintenance Policies

The mechanical equipment faults result from parts failure in the period of service time, due to reassembly and maintenance, the reliability model for mechanical equipment is broken, so it is necessary to research and estimate the safety reliability of mechanical system. Based on the time-to-failure density function of parts, the mechanical system reliability model is constructed to track the change course of age structure of part population for the mechanical systems that are reassembled and maintained. By means of simulation of the system reliability model, concerned parameters with mechanical systems service life are defined, it is discussed how the time-to-failure density function have influence on the service life for mechanical systems undergoing reassembly and maintenance. It is significant to estimate reliability and failure rate of systems and to establish reasonable maintenance policies.

The Control of Vibration Transmissibility Using an Electrodynamic Actuator –Close-Loop Solution

2013 ◽  
Vol 436 ◽  
pp. 166-173
Author(s):  
A. Mihaela Mîţiu ◽  
Daniel Constantin Comeagă ◽  
Octavian G. Donţu
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Mechanical System ◽  
Closed Loop ◽  
Mechanical Systems ◽  
Vibration Transmissibility ◽  
Technical Solutions ◽  
The Mathematical Model

In this paper are presented some aspects of transmissibility control of mechanical systems with 1 DOF so that the effects of vibration on their action to be minimized. Some technical solutions that can be used for this purpose is analyzed. Starting from the mathematical model of an electro-mechanical system with 1 DOF, are identified the parameters which influence the effectiveness of the transmissibility control system using an electrodynamic actuator who work in "closed loop".

scholarly journals Mechanical system reliability analysis using reliability matrix method

2018 ◽  
Vol 365 ◽  
pp. 042067 ◽  
Author(s):  
Olga Burukhina ◽  
Anna Bushinskaya ◽  
Irina Maltceva ◽  
Svyatoslav Timashev
Keyword(s):  
Mechanical System ◽  
Reliability Analysis ◽  
System Reliability ◽  
Matrix Method ◽  
System Reliability Analysis

Controlled Arming of Mechanical Systems Embedded into Embarked Electrical Systems

2014 ◽  
Vol 555 ◽  
pp. 209-216
Author(s):  
Gheorghe Negru
Keyword(s):  
Kalman Filter ◽  
Mechanical System ◽  
High Speed ◽  
Mechanical Systems ◽  
Electrical Systems ◽  
General Motion

The paper presents an application of the Kalman filter to achieve the controlled arming of mechanical system embedded into embarked electrical systems (FMES). The solution of FMES which contain mechanical subsystems electronically controlled could significantly reduce the influence, on their functioning, of the general motion of high speed object (HSO) .

The Method for Determining the Vibration-Damping Elements for the Mechanical System to Obtain the Desired Amplitude Value

2014 ◽  
Vol 657 ◽  
pp. 644-648 ◽  
Author(s):  
Andrzej Dymarek ◽  
Tomasz Dzitkowski
Keyword(s):  
Mechanical System ◽  
Dynamic Characteristics ◽  
Vibration Reduction ◽  
Mechanical Systems ◽  
Vibration Damping ◽  
Displacement Velocity ◽  
Synthesis Methods ◽  
Resonance Frequencies

The paper presents the use of synthesis methods to determine the parameters of passive vibration reduction in mechanical systems. Passive vibration reduction in a system is enabled by units called dampers whose values are determined on the basis of the method formulated and formalized by the authors. The essence of the method are, established at the beginning of a task, dynamic characteristics in the form of the resonance and anti-resonance frequencies, and amplitudes of displacement, velocity or acceleration of vibration.

Mechanical system reliability and risk assessment

AIAA Journal ◽  
1994 ◽  
Vol 32 (11) ◽  
pp. 2249-2259 ◽  
Author(s):  
T. A. Cruse ◽  
S. Mahadevan ◽  
Q. Huang ◽  
S. Mehta
Keyword(s):  
Risk Assessment ◽  
Mechanical System ◽  
System Reliability

Electrical Elements in Reduction of Mechanical Vibrations

2013 ◽  
Vol 371 ◽  
pp. 657-661 ◽  
Author(s):  
Katarzyna Białas
Keyword(s):  
Mechanical System ◽  
Vibration Reduction ◽  
Mechanical Systems ◽  
Synthetic Method ◽  
Basic System ◽  
Mechanical Vibrations ◽  
Parametric Synthesis ◽  
System Designer ◽  
Active Elements ◽  
Reduction Methods

This work presents methods of reduction of the vibration of mechanical systems by means of active elements as well as examples of implementation of active reduction of vibration by means of electrical elements [. This work also describes a structural and parametric synthesis, which can be defined as the design of systems meeting specific requirements. These requirements refer to the frequency values of the systems vibration. The presented approach i.e. a non-classical synthetic method applied in designing mechanical systems, one (as early as at the design and construction stage) may verify future systems [1-. This work presents the description of vibration reduction methods. The most popular methods are passive, active and semi-active. An important aspect of this work is the presentation of several possibilities of the physical implementation of active subsystems. In examples active subsystems consisted of the following electric elements is coil with a movable core. In this work is presents influence of electrical subsystem to basic mechanical system. Designer should analyse the resultant systems and investigate the interaction between the subsystems and the basic system [4-.

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