Effect of customization system elements on vehicle comfort in tracked vehicles Mehmet Nuri ÖZDEMIR (a), Y. Samim ÜNLÜSOY (b) (a) FNSS Defense Systems a. P., 06830,, (b) Makina Eng. Plenty., Metu 06531,, abstract one of the first steps of Decoration Design in tracked vehicles is the selection of decoration parameters during the adjustment of the height of the vehicle snow. In this study, how parameter selection during adjusting the height of the vehicle snow in tracked vehicles affects the comfort of driving the vehicle was examined. How pallet tension affects control comfort has also been assessed. Cooling power technique was used as a comfort assessment criterion.  community cooled power was calculated using the acceleration version collected from the driver's seat while driving the car. Two groups of simulations were performed. In the first group simulators, vehicles with suspension arm free angles at different and torsion bar torsion hardness at different were driven to ensure the same vehicle height below the abdomen. Comfort account customization lever free description has shown that increased comfort increases. In the second group of simulations, vehicles with different pallet tension were driven. Results show that increased pallet tension increases vehicle comfort. Keywords: driving comfort, tracked vehicle summary one of the first steps in the design phase of suspension system elements in tracked vehicles is the derivation of suspension system parameters during adjustment of road clearance. In this study, the effects of choice of suspension parameters on driving comfort during adjustment of road clearance were examined. The effect of runway tension on ride comfort has also been shown. The absorbed power technique is used as an evaluation of comfort criteria.  the acceleration data of the driver's seat recorded while driving is converted to total absorbed power. Two simulations are performed. First, vehicles with different sets of torsion bar free angle and torsion bar stiffness that meet the same hub height are driven. The results reveal increased ride comfort with increased torsion bar free angle. After
2 vehicles with different track voltages are driven, and the results indicate that driving comfort is increased by increasing track tension. Keywords: Driving Comfort, Tracked Vehicle, 1. Driving comfort in entry road vehicles is a design criterion for evaluating the level of vibration that the driver is exposed to. Y studies have shown that stimuli with different amplitude and frequency content affect pathways in different regions. A stimulus with a certain amplitude and frequency content can relax passengers, as well as harmful effects that pass or remain at certain values . The decoration system of tracked vehicles with torsion bar type decoration consists of the lower parts shown in Figure 1 and Figure 2. These parts are pallets, road textiles, suspension arms, torsion bars, dampers, support textiles, draw teeth and Drifter textiles. Figure 1. Crawler vehicle with torsion bar type decoration  Figure 2. High application and application torsion B-Bar type suspension in the design of a Tracked Vehicle, the weight of the vehicle, the geometry of the vehicle, the points of the pallet and suspension elements connected to the vehicle body are determined in the first stages. When the design time of the vehicle's customization system is passed, selecting the vehicle's height below the snow is one of the first steps. Two different parameters are set to adjust the height of the vehicle. The first parameter is torsion bar stiffness, the second ISE suspension arm is open free. Naturally, the height under the same abdomen can be achieved at different torsion B bar stiffness or suspension arm release values. However, geneldee
At 3 different points, the selected customization parameter values will also affect the car's driving comfort. When adjusting the height of the vehicle under the snow, the parameter selection should be made in such a way as to positively affect the vehicle's driving comfort. For this reason, it is necessary to determine in which direction the two parameters to be considered will affect the comfort of the vehicle. In this study, the effects of torsion bar stiffness and suspension arm free angle on driving comfort were primarily investigated. For this purpose, a very free-grade dynamic tracked vehicle software tracksim written in Matlab / Simulink te was used . This software also allows you to model the way in which the tracked vehicle will be driven on the side of the vehicle. Among the parameters that can be examined is the pallet tensioner. In the simulations, a Test park consisting of bumps used as a broadcast in the tests of tracked heavy vehicles was used. A modeled military tracked vehicle, fixed speed driving on this track and the use of absorbed power management driving comfort regulations have been determined. In the study, the effect of the pallet tensioner on control comfort was also studied with simulations conducted using the same model and test method. 2. Crawler vehicles with torsion bar type decoration torsion bars together with the pallet form the effective rigidity of the vehicle decoration system. The torsion hardness of the torsion rods and the attachment of the suspension arm to the torsion rods is free open, significantly affect the effective rigidity. As shown in Figure 2, the suspension arm free description (Θ F) represents the description between the suspension arm and the torsion bar horizontal axis when the torsion bar is not high above it. When the road wheel approaches the vehicle sky, the torsion bar is reduced in torsion and the description of the decoration arm is reduced. Increasing the torsion bar hardness as well as the free angle of the suspension arm increases the effective hardness of the decoration. In the same way, the reduction of torsion bar stiffness and suspension arm free angle also reduces the effective suspension stiffness. For this reason, both parameters have an effect on control comfort, and it is important to choose the correct combination of the vehicle original during the design period. 3. Control comfort assessment with cooled power technique the control comfort calculation method used as a publication for military vehicles is the cooled power direction.  the power that absorbs is the speed of cooling the energy of a person who remains Marus to vibration. The absorbed power calculation can be performed for all three displacement axes, but in standard tests, this calculation is usually only performed for the vertical axis. Vehicle speed exceeding 6 [W] of cooled power is considered critical vehicle speed, and going at speeds higher than these speeds is considered calmly for the health of passengers.
4 The absorbed power value is calculated by multiplying the acceleration Spectral density spectrum (PSD) by the appropriate transfer function and taking the integral: (1) in the equation, P is the total absorbed power value, I. rms acceleration value for Band and C I I frequency. G denotes the weight coefficient corresponding to the band frequency. 4. Case studies in these studies, simulations were conducted to show the effect of different customization elements and parameters on control comfort. a military vehicle with a Y 6 wheel Crawler, a multi-deGree dynamic crawler model written in Matlab / Simulink, is also modeled on Tracksim. For simulations with this model, the path in which the tracked vehicle will be driven on the side row of the vehicle is also modeled. In simulations, the car was driven at constant speed on a test path consisting of hard apg bumps. The flat and geometry of the APG bumps in the test path , Figure 3 and Figure 4 tee are given. Figure 3. Hard apg bump test path Figure 4. Bump geometry 4.1. Examination of the effect of torsion bar stiffness and suspension arm free angle on driving comfort in this section, using 5 different combinations of torsion bar stiffness and suspension system free angle given in Table 1, which provide the same abdominal height, the car was driven at a certain constant speed on the APG path given in Figure 3 and the absorbed power values were compared. Configuration 1 configuration 2 configuration 3 configuration 4 configuration 5 configuration lever free angles [degree] torsion bar torsion stiffness [N. m / degree] Table 1. Combination of suspension arm free angles and torsion bar torsional stiffness, which provide the same vehicle abdominal height
5 acceleration values measured in the vertical direction in the vehicle coordinate system from the hard drive seat to the vehicle body were shown in Figure 5 while passing through the vehicle's test path. To calculate the cooled power value, PSD data of acceleration time data was first calculated (Figure 6). The estimated PSD was used to find total cooled power with the calculation management in Equation 1 along with the frequency weight coefficients. Figure 7 shows the contribution of each frequency band to the community cooled power. When absorbed power values at all frequencies are collected, the total absorbed power is in hand (Table 2). 5 figure. Figure 6 acceleration and time. PSD P version Vee frequency configuration 1 configuration 2 configuration 3 configuration 4 configuration 5 Figure 7. Absorbed power and frequency bands absorbed total t power [W] Table 2. Total absorbed powers