徐工RP953T多功能超厚摊铺机

徐工RP953T型多功能摊铺机在云南的施工中酋战大捷。作为新一代摊铺机的升级产品，RP953T多功能超厚摊铺机打破了传统摊铺机产品的设计理念，集徐工成熟的路面施工工艺及摊铺机优质的路面成型技术于一身，可以实现500mm以上的摊铺厚度。     

摊铺机自动找平系统高度传感器的分析与比较

摊铺机自动找平系统中高度传感器的选取非常重要，在对沥青混凝土摊铺机自动找平系统中的几种不同高度传感器进行了分析与比较后，说明了其在摊铺机作业中的性能特点，对研制摊铺机自动找平系统有重要价值。     

沥青混凝土摊铺机电气控制系统的改造

针对沥青混凝土摊铺机单片机数字控制系统的不足，结合可编程控制器完善的功能、特点及良好的接口性能，对摊铺机原控制系统进行了改造，提高了摊铺机电气自动控制系统的工作可靠性，简化了电控系统外围驱动电路。     

沥青混凝土混合料摊铺机的工作原理探讨

本简要论述沥青摊铺机使用历史，研讨了浮式熨平器的工作原理，以及摊铺机牵引装置与整车装置.无论多么现代化的摊铺机，其基本功能仍是相同的。     

浅谈路面基层的摊铺技术

二灰和水泥混合料路面基层，目前在国内采用摊铺机摊铺尚不普遍，该文详细叙述了摊铺机摊铺基层时，应做的各项工作和要求，包括摊铺机工作装置的调整和工作参数的确定。     

摊铺机检测试验技术的发展及应用

针对摊铺机检测试验技术在国内的发展情况，介绍了机电液一体化摊铺机检测试验的方法，为现代摊铺机的故障排除提供了较有效的检测方法和思路，使故障排除进一步科学化、理性化和数字化。     

CMI滑模摊铺机的初始调整与主要工作参数确定

作者曾多次参加美国产CMI滑模式水泥混凝土路面摊铺机的安装和调整，在此对该产品的初始调整方法和主要工作参数的确定进行了比较系统地总结，可供广大使用CMI滑模式摊铺机的施工单位参考。由于各种滑模式摊铺机的工作原理是相同的，所以该文对使用其它品牌摊铺机的用户也有一定参考价值。     

滑模摊铺的机械设备配套

水泥滑模摊铺工艺中，其主导设备为水泥搅拌设备及水泥滑模摊铺机。在介绍了滑模摊铺机发展历史及趋势后，对水泥搅拌设备及滑模摊铺机的工作原理及设备配套进行了叙述，并提出施工中应注意的一些问题。     

滑模式水泥混凝土摊铺机不塌边混凝土配合比及工艺参数的研究

通过对ＳＦ３５０型滑模式摊铺机进行浇筑成型工艺及滑模工艺性能的试验研究，说明实施滑模式摊铺机滑模工艺具有能使混凝土硬化后强度提高的性能，并以此对滑模式摊铺机混凝土配合比工艺参数进行了分析，对其规律性进行了探讨。     

全数字控制摊铺机研制成功

由徐工科技路面公司和德国MOBA公司共同研究开发的世界上第一台具有找平一体化先进控制技术的“全数字控制”沥青渔凝土摊铺机诞生，现已小批量投放市场试用。“全数字控制”沥青混凝土摊铺机在控制技术方面取得了重大突破，多项技术达到国际领先水平，该机成功推向市场后，将打破摊铺机核心技术由国外垄断的局面，从而大大提升徐工摊铺机的国际竞争力和市场品牌形象。     

Observer Design for Electronic Suspension Applications*

SUMMARY

This paper proposes a new methodology for designing observers for automotive suspensions. Automotive suspensions are disturbance-affected dynamic systems. Semi-active suspensions are bilinear while active suspensions with hydraulic actuators are nonlinear. The proposed methodology guarantees exponentially convergent state estimation for both these systems. It uses easily accessible and inexpensive measurements. The fact that sprung mass absolute velocity of the suspension cannot be estimated in an exponentially stable manner with such measurements is also demonstrated.

Controllers using estimated states are implemented experimentally on the Berkeley Active Suspension Test Rig. Experimental results for two cases are presented : use of observer states to improve ride quality in an active suspension and use of observer states to reduce dynamic tire loading in a semi-active heavy vehicle suspension.     

Kurshaltungskennwerte und ihre Abhangigkeit von Fahrzeugdaten*

Vehicle Handling Characteristics and Their Relationship to Vehicle Design Parameters

This paper reviews currently used test procedures for the determination of vehicle handling characteristics in the time and frequency domain. Driver subjective opinions lead to preferred tendencies or ranges of these quantities. The results of closed-loop tests show the adaptability of drivers to the dynamic characteristics of vehicles. The relationship between handling characteristics and design parameters is obtained from the analysis of a simple vehicle model. Comparison of these results with the prefered ranges found in closed-loop tests yields aids for the design of vehicles.     

Outsourced probe data effectiveness on signalized arterials*

ABSTRACT

This paper presents results of an I-95 Corridor Coalition sponsored project to assess the ability of outsourced vehicle probe data to provide accurate travel time on signalized roadways for the purposes of real-time operations as well as performance measures. The quality of outsourced probe data on freeways has led many departments of transportation to consider such data for arterial performance monitoring. From April 2013 through June of 2014, the University of Maryland Center for Advanced Transportation Technology gathered travel times from several arterial corridors within the mid-Atlantic region using Bluetooth traffic monitoring (BTM) equipment, and compared these travel times with the data reported to the I95 Vehicle Probe Project (VPP) from an outsourced probe data vendor. The analysis consisted of several methodologies: (1) a traditional analysis that used precision and bias speed metrics; (2) a slowdown analysis that quantified the percentage of significant traffic disruptions accurately captured in the VPP data; (3) a sampled distribution method that uses overlay methods to enhance and analyze recurring congestion patterns. (4) Last, the BTM and VPP data from each 24-hour period of data collection were reviewed by the research team to assess the extent to which VPP captured the nature of the traffic flow. Based on the analysis, probe data is recommended only on arterial roadways with signal densities (measured in signals per mile) up to one, and it should be tested and used with caution for signal densities between one and two, and is not recommended when signal density exceeds two.     

Wheel/Rail Contact: Geometrical Study*

Before trying to ascertain the precise nature of the Wheel-Rail contact (internal stresses and strains, wear and friction, security against a derailment, dynamic behaviour of the vehicle, etc.) the geometrical problem must necessarily be solved. That is, for each position of the wheelset (this is defined by 6 parameters, of which only 4 are independent) the two dependent parameters and the coordinates of the points of contact of each wheel, and rail must be obtained. A new method is proposed of obtaining the spatial position of a wheelset with reference to the rails, from the most general point of view.     

Achievable Dynamic Response for Automotive Active Suspensions *

A complete set of constraints is derived for the road disturbance transfer functions in a quarter car model of an automotive active suspension, for typical choices of measured outputs. It is shown that any road disturbance responses which are achievable using “full state feedback” can be achieved, to within an arbitrary small tolerance, using a dynamic compensator measuring suspension deflection only. Also considered are the disturbance responses to loads acting on the sprung mass, and a complete set of constraints is derived for these. It is shown that road disturbance and load disturbance responses can be determined independently if suspension deflection and sprung mass velocity are measured. Indeed, any responses achievable separately with “full measurements” can be approximated together to an arbitrary small tolerance. Certain integral relationships are shown to follow from the derived transfer function constraints. These relationships imply fundamental limitations for certain responses (e.g. tyre deflection) no matter what measurements are available for feedback.     

Approximate Dynamic Shimmy Response of Pneumatic Tires*

An improved approximation of the theory of the dynamic frequency response of side force and aligning torque acting upon the rolling wheel when the latter is moved laterally and swivelled about the vertical axis, is presented. The method is particularly suitable for application in vibration problems of steering and suspension systems of automobiles and aircraft where relatively high speed and high frequency phenomena play a role. The theoretical results show satisfactory agreement with experimental data. Calculations indicate that the inertia of the tire decreases the tendency to shimmy at higher frequencies and speeds of travel. For castered wheels however, tire inertia may have an adverse effect due to its unfavorable influence upon the side force response to swivel motions.     

Tractor-Semitrailer Dynamics: Design of the Fifth Wheel*

The nonlinear equations of motion are derived for a tractor-semitrailer truck where both the itractor and the semitrailer yaw, pitch, roll, and translate. Special emphasis is placed on the constraints imposed by the fifth wheel on the vehicle motion. In particular, the effects of two proposed fifth wheel design changes on the jackknifing behavior of a vehicle in a turning, braking maneuver are studied. The results demonstrate that the tendency of the vehicle to jackknife can be reduced with a geometric modification of the fifth wheel.