R. Burdzik

Monitoring System of Vibration Propagation in Vehicles and Method of Analysing Vibration Modes

Article provides a presentation of a prototype monitoring system for the vibrations occurring in vehicles. The mathematical algorithm prepared and programmed enables the analysis and separation of the crucial properties of vibration signals. The application of an automatic algorithm developed and proposed by the author for the recognition of stationary and non-stationary states makes it possible to use the appropriate tools assuming the form of frequency as well as time and frequency transforms. The paper also provides a discussion concerning the concept of a neural classification system which may be applied as a decision-making module in a control system. Preliminary numerical tests have confirmed the system’s functional correctness. The monitoring system is based on the assumption that vibrations can be recorded at any chosen structural point of a vehicle which enables the vibration propagation to be analysed as well as their time, frequency or time and frequency modes to be assessed.

Possibility to Control and Adjust the Suspensions of Vehicles

The use of passive spring and damping elements with fixed unchangeable characteristics of the suspensions of vehicles suspension is a compromise in terms of the characteristics of these components selection criterion for the sake of safety and comfort. In these embodiments, it is impossible to adjust the parameters of the suspension. The use of spring and damping elements with controlled characteristics for semiactive, active and adaptive suspension to adjust the suspension for specific road conditions and driving style. The paper presents a comparison of passive solutions based on traditional mechanical components and hydropneumatic suspension and active adoption used in vehicles, comparing the characteristics of spring and damping elements used in these solutions.

Application of Vibroacoustic Methods for Monitoring and Control of Comfort and Safety of Passenger Cars

The paper presents the possibilities of application of vibroacoustic methods for monitoring and control of comfort and safety of passenger cars. It is described the WSA program for vibration signals processing. The paper presents some results of prototype experimental research and conception of the monitoring and control of comfort and safety system. The results of the WSA modules can be the input signal for the damping properties control system integrated with mechatronics system of vibration absorbing elements of suspension or engine and powertrain system mounting and springing elements.

The Method for Identification of Damping Coefficient of the Trucks Suspension

The modern commercial vehicle with a weight of more than 3,5 [Mg] is a complex design solution, which contains many of mechatronic systems. The standard equipment are the ability of the driver assistance systems such as ABS (Anti-Lock Braking System), ESP (Electronic Stability Program), ASR (Acceleration Slip Regulation). The technical condition of the modern cars suspension determines the value of the indicators of road safety. An essential element of the suspension system, whose function is to change the mechanical vibration energy into thermal energy, is the shock absorber. Incorrect functioning of shock absorbers affects the quality of the operation of these systems improve safety. In the case of gradually wears of shock absorber even an experienced driver is able to notice this phenomenon. For this reason it becomes necessary the need for regular technical condition monitoring of dampers. Diagnostic dampers on buses and trucks are limited to the organoleptic examination and propose based on intermediate symptoms such as accelerated tire wear. The paper describes the method for estimating the suspension damping characteristics of commercial vehicle in operating conditions.

Simulation and Laboratory Studies on the Influence of Selected Engineering and Operational Parameters on Gear Transmission Vibroactivity

The optimization of the construction of gears leading to the minimization of dynamic effects and to meet all basic criteria is in many cases only possible by applying numerical methods. The models allow determining the influence of a range of factors on the dynamic phenomena. Proper experimental tests are often not possible because the number of options of influencing factor sets is very large. Using simulation models allows limiting the volume of experimental studies to the necessary minimum, and hence is beneficial from the economic standpoint. The paper describes numerical and laboratory researches on the influence of selected construction, technological and operational factors on the dynamic effects and vibroactivity in gears. Numerical analyses were performed using a custom-developed dynamic model of a test stand with the gears operating in the circulating power system. The models details were presented at the International Congress on Technical Diagnostics in 2008. The idea behind this article is to present selected results of simulation calculations and laboratory tests to determine the possibility of minimizing the noise and vibration of gears. Selected results of the calculations were also compared with the results of laboratory tests to demonstrate the high compatibility of the two test methods.

Research on Dynamics of Shunting Locomotive During Movement on Marshalling Yard by Using Prototype of Remote Control Unit

The paper refers to presentation on 13th International Conference on Dynamical Systems Theory and Applications. The discussion of such wide group of scientists allowed to extend the paper and presents some new results. The processes conducted on marshalling yard generate a lot of movement with many direction and speed changes which generate different dynamic forces. In the course of shunting of train, there are large range of activities performed that enable observation of multiple dynamic phenomena under relatively advantageous conditions. Thus the main focus of the research was to test possibilities of developed remote measurement system. Also algorithm of analysis was developed and implemented as software into control unit. The paper discussed both the concept and the application of a simple method of remote supervision of shunting runs using mobile devices enabling observation and recording of chosen dynamic parameters of a rail vehicle. The paper presents result of linear accelerations of vibration in 3 axes and speed occurring in the course of the shunting locomotive’s operation and also current physical position and altitude above sea level. Such a simple measuring system allows for monitoring of basic physical parameters of shunting operations performed by the shunting engine driver.

Concept of On-Board Comfort Vibration Monitoring System for Vehicles

Ride comfort is extremely difficult to determine because of the variations in individual sensitivity to vibration. Vibration can cause a variety of diseases or at least unpleasant feeling states. The impact of this phenomenon is subjective and depends on human perception. The vibration perception depends on values, time and frequency band of the vibration. Exposure to vibration and the human perception are strongly connected with comfort or discomfort feeling on the driver and passengers. For identification the mapping of vibration measuring in multiple points is very useful. Under the studies in question, active experiments were undertaken featuring measurements of vibration accelerations in a vertical direction perpendicular to the horizontal surface of vehicle in selected points located in carbody. The analytical experiment on application of neural networks in the identification of pressure level in tires of a vehicle based on vibration signals was conducted. Based on the results the concept of on-board comfort vibration monitoring system for vehicles was developed.

Comparison of Characteristics of the Components Used in Mechanical and Non-Conventional Automotive Suspensions

The paper presents the comparison of the characteristics of spring and damping components used in conventional and non-conventional automotive suspensions. The conventional suspension is based on steel coil springs and hydraulic dampers with fixed characteristics. As an example, the adaptive non-conventional suspension shows the characteristics of hydropneumatic suspension components (suspension are constantly being developed and is now based on mechatronic control systems of damping characteristics). The paper summarizes the advantages and disadvantages of these solutions.

Automatic Control Systems and Control of Vibrations in Vehicles Car

Growing customer requirements for comfort of vehicles more often become refer to vibrations that affect the people in transport. At the same time each car put into service must has the appropriate parameters traction to the road surface responsible for the safety. Due to the nature of the vibration transmitted to the vehicle body vibration requirements are of the often contradictory. Therefore, an intense research on modern control systems, active vibration damping system parameters are require. This paper presents the advantages and disadvantages associated with the suspension systems of vehicles of conventional and active and semiactiv based on the elements of a controlled characteristics of both elastic elements and damping. It was suggested the possibilities of advanced signal processing methods application developed in vibration research.

State of Stress Analysis for Structural Solutions of Combustion Engine Piston Pins

This paper addresses a study undertaken to develop spatial numerical models of a piston, a piston pin and a connecting rod with reference to real components of a combustion engine crank system. The numerical studies conducted comprised an analysis of how the mechanical strength of piston pins was influenced depending on the change in their inner shape. For the purposes of calculations, various scenarios of shape modification were proposed for piston pins currently in use, enabling their weight to be reduced.