Vibration test information-based vehicle physical parameter estimation method
A physical parameter and vibration testing technology, applied in the field of vehicle physical parameter estimation, can solve the problems of complex operation and inaccurate results, and achieve the effect of simple operation, accurate and reliable results, and clear principles
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specific Embodiment approach 1
[0061] Specific implementation one: as figure 1 and image 3 shown, figure 1 The application scenario of the present invention is illustrated in the figure, the direction of the arrow in the figure is the falling direction of the target vehicle, and each wheel of the target vehicle in the figure is correspondingly provided with a prefabricated block for parking, image 3 The structure of the prefabricated block for parking is shown in Fig. 2. The prefabricated block for parking is a rectangular block, and one end of the prefabricated block is machined with a slope where the wheels enter.
[0062] like figure 2 As shown, when the target vehicle is a quarter vehicle model, the whole of the target vehicle is divided into static parts and dynamic parts based on the suspension spring. The static parts are the connecting rods in the independent suspension system and the four-wheel drive system The parts of the drive shaft are all parts that are directly or indirectly connected t...
specific Embodiment approach 2
[0067] Embodiment 2: This embodiment is a further limitation of Embodiment 1. Taking the simplified model of a quarter vehicle of the target vehicle as an example, the suspension sprung mass m of the target vehicle is obtained. s and suspension unsprung mass m u : Suspension sprung mass m s with suspension unsprung mass m u The sum is the vehicle mass m, among which, the suspension sprung mass m s with suspension unsprung mass m u Calculated separately by vehicle configuration design.
[0068] The acceleration generated by the target vehicle in the process of in-situ vibration refers to the process of causing the target vehicle to generate vertical free vibration and measure the response, as follows:
[0069] like figure 1 As shown, first, the wheels of the target vehicle are parked on the pre-set parking blocks, and the first acceleration sensor 20 and the second acceleration sensor 21 are respectively set at the bottom of the car and the chassis. The first acceleration ...
specific Embodiment approach 3
[0091] Specific implementation three: as Figure 4 , Figure 5 and Image 6 As shown, the improved unscented Kalman algorithm based on the recursion window, in the recursion process, in a single recursion window, when k=0, the values of all the quantities to be identified are the initial values set initially. After the first step of recursion ends, the y in each window 0 It has been corrected once, and the rest to be estimated y 1:L-1 It has not been corrected for the time being. When k=1, in the recursive process, the result of the recursive calculation when the previous step k=0 will be used as the quantity to be estimated y 0:L-1 The initial value of , and the recursive calculation is carried out according to this rule, until the recursion ends when k=L, and the recursive results of the L to-be-estimated quantities in the recursion window are output. Therefore, the first y to be estimated in the recurrence window i will be updated L times, the second to be estimate...
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Abstract
Description
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