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Many countries with underdeveloped economies tend to improve military vehicles to enhance their effectiveness by integrating additional equipment into existing vehicles. Armored personnel carriers can be integrated with crane systems and cables to function as cranes for rescue and recovery operations on the battlefield. This paper proposes a dynamic model for a military armored recovery vehicle moving on randomly rough roads in a suspended payload state. The randomly rough roads of classes D, E, and F, as described in the ISO 8068 standard, are considered as factors influencing the vibration of the vehicle during movement. The research model is a 2D multi-body system, considering the elasticity of the tires, suspension system, and cables, while neglecting the elastic slope of the ground. The system's motion differential equations are solved through simulations using Matlab/Simulink software. The results indicate the displacement of the vehicle chassis and the oscillation of the payload corresponding to speeds of 1 m/s, 1.5 m/s, and 2 m/s. The payload's tilt angle can reach nearly 40° when the vehicle moves at a speed of 2 m/s on a type F road, corresponding to a travel distance of about 30 meters. Meanwhile, the maximum tilt angle is about 19° when the vehicle moves at the same speed on a type D road. The chassis, boom, and payload experience stronger oscillations when the vehicle moves faster and on rougher terrain. The paper recommends practical engineering solutions to minimize load oscillations during vehicle movement. The findings of this paper provide a basis for evaluating the operational capability of an armored personnel carrier integrated with a crane, contributing additional theoretical insights into machine dynamics and holding significant importance in the military field

In this paper, the influence of the number of blades on the flow characteristics and aeroacoustics performance of a forward impeller centrifugal fan used in a milling recovery vehicle is studied by numerical simulation. The results show that the total pressure of the forward centrifugal fan increases with the increase of the number of blades. When the number of blades is 18, the vortex loss caused by boundary layer separation in the impeller is relatively low. Under the design flow and small flow conditions, the total pressure efficiency of the fan first increases and then decreases with the increase of the number of blades. The noise analysis shows that the cochlear tongue and the surface of impeller runner near the volute outlet are the main sources of fan noise. The far field noise characteristics of the fan with 16 blades are better than those of the prototype fan. The discrete noise at the fundamental frequency of monitoring point B and monitoring point D is 6.25dB and 1.2dB lower than that of the original fan, respectively. The research results have a good guiding significance for the design and optimization of forward centrifugal fan.

Social scientists have long shown great interest in the spatial correlates of crime patterns. A subset of the literature has focused on how micro-level spatial factors influence the formation of crime hot spots. At the same time, tangential research has highlighted how neighbourhood disadvantage influences crime occurrence. The current study focuses on the intersection of these perspectives through a spatial analysis of Motor Vehicle Theft (MVT) and Motor Vehicle Recovery (MVR) in Colorado Springs, CO. We begin by conducting a Risk Terrain Modelling analysis to identify spatial risk factors significantly related to MVT and MVR occurrence. We then test whether the spatial influences of the criminogenic risk factors differ across traditional measures of neighbourhood disadvantage. Findings suggest that while a citywide effect is evident for multiple risk factors, their spatial influence on crime significantly varies across neighbourhood contexts. 社会科学研宄者们一直以来对犯罪模式的空间关联性展现出浓厚兴趣。一部分研宄重点关注微 观层面的空间因素如何影响犯罪热点地区的形成。同时，外围研宄强调了街区的缺陷如何影响 犯罪发生率。本研宄通过对美国科罗拉多州科罗拉多泉市机动车盗窃(MVT)和机动车找回(MVR) 数据的空间分析，聚焦了这些视角的交叉之处。我们首先开展了一项风险地形建模分析，来找 出与MVT和MVR发生率有着重大关联的空间风险因素。然后，我们测试了引起犯罪行为的风 险因素之空间影响在街区缺陷的不同传统指标上是否有所不同。分析结果显示，虽然多个风险 因素对全城都有影响，但它们对犯罪的空间影响在不同街区有着显著不同。

Through theoretical analysis of a suspension mechanism used for aircraft recovery vehicle, the mapping relationship between the hydraulic cylinder axial force and scale parameters of the suspension mechanism was built. With coordinate values of each hinge joint of the suspension mechanism in the initial position as design variables, the minimum hydraulic cylinder axial force was taken as evaluating index with reasonable constraints and optimal design of the hydraulic suspension mechanism was studied. The influence law of scale parameters to the axial force was discussed and coordinate alternation method was applied to find the optimal solution. The effectiveness of the method was indicated by an example.

ZMK5200QJY40 type Mining Recovery Vehicle for Hoisting was designed for quick borehole rescue. In this paper, the traits between underground rescue and ground borehole rescue were analyzed, technical principle of the vehicle was introduced, the technical parameters of rescue capsule and hoisting control system were listed. Of the 11 key parts in the vehicle, the rescue capsule design and the design of hoisting winch with large rope capacity were introduced in detailed. It was tested in Pingshang Coalmine of Qinxiu Coal Co., Ltd in Jincheng, Shanxi. It was validated that the vehicle is useful for normal borehole or sleeve with the diameter of 580mm to 620mm. With the help of the vehicle, the miners trapped in 900 meters underground can be rescued quickly and safely. ZMK5200QJY40 type Mining Recovery Vehicle for Hoisting was developed successfully; it can be used for vertical rescuing in large borehole. Matching with the new-designed rescue drilling rig, a package of emergency rescue technology and equipment were formed.

This paper presents a comprehensive study on the application and optimization of automotive thermoelectric generators (ATEGs), focusing on the crucial role of heat exchangers in enhancing energy conversion efficiency. Recognizing the substantial waste of thermal energy in internal combustion engines, our research delves into the potential of TEGs to convert engine waste heat into electrical energy, thereby improving fuel efficiency and reducing environmental impact. We meticulously analyze various heat exchanger designs, assessing their influence on the TEG’s output power under different exhaust gas flow rates and temperatures. Furthermore, we explore the impact of TEG material properties on the overall energy conversion effectiveness. Our findings reveal that specific heat exchanger designs significantly enhance the efficiency of waste gas heat exchange, leading to an improved performance of the TEG system. We also highlight the importance of thermal insulation in maximizing TEG output. This study not only contributes to the ongoing efforts to develop more sustainable and efficient vehicles but also provides valuable insights into the practical application of thermoelectric technology in automotive engineering. Through this research, we aim to pave the way for more environmentally friendly transportation solutions, aligning with global efforts to reduce fossil fuel dependence and mitigate environmental pollution.

Large capacity lead-acid battery is used in track electric locomotive, and State of Charge (SOC) is an important quantitative parameter of locomotive power output and operating mileage of power emergency recovery vehicle. But State of Charge estimation has been a difficult part in the battery management system. In order to reduce the SOC estimation error better, this paper uses the linear relationship of Open Circuit Voltage (OCV) and State of Charge to fit the SOC-OCV curve equation by MATLAB. The method proposed in this paper is small, easy to implement and can be used in the battery non-working state SOC estimation correction, improve the estimation accuracy of SOC.