The Study On Dynamics Of Howiter In Traveling State

This paper discusses about EHP155 light driving howitzer (experimental artillery) according to driving dynamics. If the traveling situation of the artillery tractor is bad, the plainness of road surface will influence artillery vibration greatly.Experiments and calculation shows that the larger the surface plainness is, the greater the response of the acceleration of the artillery parts is. Researching the situations of the road surface is very important for the driving dynamics characteristics of the traveling artillery. The moving maneuverability (the characteristics of braking, steering, manipulation) of the artillery is also a problem we concern. This paper mainly discusses about the acceleration response of the artillery that is caused by the plainness causes under traveling condition. And according to the system aspect of the matching between the tractor and artillery which composes the artillery train, it also presents the characteristics of the steering, braking stability and manipulating stability which affects the artillery moving maneuverability. The main research and conclusion of this paper can be summarized as following:1. Use stochastic simulation, create the plainness sequence of the stable stochastic road surface for the target road spectrums with programming, and use logistic test to verify. The density of the resultant spectrums of the road surface coincides with that of the expecting power spectrums generally. It lays foundations for wide researches in the artillery driving experiments in the future.2. Deduce the spectrum matrix of six-tire input under the conditions that the tractor is two-axle and four-wheel (the rear wheel is double-tire) and the artillery is one-axle and two-wheel. The matrix can be applied for the research of the vibrating frequency domain characteristics of the artillery system which is caused by the excitation of the plainness road surface. This method can also be applied to more complicated input spectrum of the wheel-system vehicles, and it has general signification.3. In order to study the vibration in the artillery traveling more accurately and completely, a tire force model of non-linear and self-adapting stochastic contacting mark is set up, and this model provides a good method to study the driving system's horizontal and vertical excitation caused by the plainness road surface. The suspension of the tractor is simplified by the model of spring-damp system, and the artillery torque rod is also simplified by torsion spring.4. Firstly, applying R-W method a 3-D dynamics model of the artillery driving train system is set up which has 26 freedoms. Then analyze the motion and dynamics; induce the dynamics equation; use multiple-step Gear estimation and correction to solve the time domain; use equivalent method of statistical linearization to solve the frequency domain. Experiments and calculation shows that thedynamics model is right and also accurate. So this research in the dynamics field of artillery tractor's vibration is reasonable.5. The driving experiments of stable stochastic excitation are carried on the pitch, damaged brick and gravel ballast roads. The acceleration time process of road surface plainness is got by using two integral calculus of the acceleration time process which is measured by five-wheel equipments. This data is worked as the input of the road surface for theoretical calculation. The result of experiments mostly fits that of calculation, and then the multiple-acceleration power spectrum distribution of the artillery and tractor are acquired. Results show that all the parts of the artillery produce vibration acceleration in the traveling course. The power spectrum is mainly in the low frequency segment. Worse road surface and higher speed will cause higher power spectrum value of the acceleration response. The acceleration is not only from perpendicular direction, but also from longitudinal direction. Generally, the amplitude of the acceleration from the perpendicular direction is higher than that from the lon...