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1. 研究目的与意义（文献综述）

1purpose and significance

1.1 research background

for information on trucks using a combination of internal combustion engines and electric propulsion, see hybrid electric truck.electric renault midlum used by nestlé in 2015.an electric truck is an electric vehicle powered by batteries designed to deliver cargo.electric trucks have been around in niche application areas for over a hundred years, but more recently the advent of lithium ion batteries has enabled the range of electric trucks to increase to several hundred miles, making them of much wider applicability.electric trucks are becoming an alternative to traditional trucks, while creating no local pollution. due to the high efficiency of electric power trains, running costs are expected to be lower.their simplicity is also supposed to make maintenance costs much lower.however, electric trucks are usually heavier than diesel trucks, the energy density of lithium ion batteries is far less, so very long range trucking requires recharging en route, causing delays, or the swapping of tractor units.

2. 研究的基本内容与方案

2.the basic content, objectives, technical solutions and measures to be adopted

2.1basic content and objectives

1. basic parameters determined according to the basic parameters of the vehicle.

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   3. 研究计划与安排

   3. schedule

   1 (7th week of the 7th semester) determine the graduation design topic, graduation design task book (related parameters), school data collection

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   4. 参考文献（12篇以上）

   4.reference

   [1] hadad h， ramezani a．finite element model updating of a vehicle chassis frame ［j］．proceedings of the ２００４ international conference on noise and vibration engineering， ２００４， ５ （３）： １８１７ -１８３１．

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