For high mobility multipurpose wheeled vehicles (HMMWV) fuel efficiency, turnability, maneuverability, stability, controllability and smoothness are important operational properties.

The suspension is an important structural element of the HMMWV, which reduces the intensity of vibration and dynamic loads arising from the interaction of the wheels with irregularities of the supporting surface, which is especially necessary when driving in extreme road operating conditions in which the use of this vehicle is supposed to be. In this regard, in the early stages of the development of the suspension, it is advisable to use a system for calculating the dynamics of bound bodies to assess the forces and moments acting in its structural elements.

In this work, a mathematical suspension model was created in the system for calculating the dynamics of bound bodies, the most dangerous loading modes are selected and numerical characteristics of loading are determined for them - reactions in the contact spot of the wheel propulsor with the bearing surface, simulation of the selected modes and analysis of the obtained results were carried out, a conclusion was made on the operability and adequacy of the obtained virtual stand and on the possibility of its further use as part of the dynamic model of the entire HMMWV. The mathematical model of the rear two arm suspension includes all its main structural elements, such as the lower and upper arms, fists, hub assemblies, elastic and damping elements.

Virtual stand for studying loading of rear suspension of HMMWV has increased accuracy of loads calculation in comparison with flat kinematic and force calculation.

Since the mathematical model of the virtual stand has a number of variable design parameters, it allows conducting studies of the influence of these parameters on the operational properties of the HMMWV without using expensive full scale prototypes. This makes it possible in the early stages of design to determine the loads acting on the rear suspension links, which can be used in strength calculations and selection of components of the suspension.

The research is devoted to the development of the weight-measurement algorithm for load-lifting cranes. The specifics of the problem is a long damping dynamic process with one amplitude-dominant harmonic. Based on the analysis of the literature, the filter (moving average) most applicable to the conditions of this problem has been found.

The research goal was to develop an algorithm for weight measurement using a moving average filter.

The stages of algorithm operation are described: determining the lifting start, searching for the peak load, determining the oscillation period, smoothing the data, determining the mass of the load with a defined accuracy.

Experimental comparison of the algorithms using a moving average filter and a direct averaging showed the independence of the algorithm on the repeatability. At the same time, the application of the developed algorithm made it possible to reduce the weighting time by 4...9 times (1.0. 6.1 sec).

The correlation between the measurement time and the accuracy of the buffer length calculation is revealed. This correlation determines the requirement for the analog-to-digital converter of the weighing devices.

It is concluded that the algorithm with a moving average filter is highly applicable to the task of measuring the load mass in conditions of static weighing (with switching off mechanisms).

This paper presents the calculation of the loads on the mounting bolts of the cab of the car when it overturns. The calculation was carried out on a computer in the SolidWorks Motion system. The novelty of the work consists in taking into account the damping properties of the rubber gaskets between the cab and the cab frame when determining the kinematic parameters when the machine is overturned.

Introduction. At the moment the hydraulic brake is turned off by closing the valves, most of the liquid is ejected from the cavity into the vehicle’s cooling system, however, part of the liquid with steam remains in the flow path and when the impeller rotates, a braking torque is created, which reduces the efficiency of the machine and reduces the transmission efficiency. To prevent the formation of residual braking torque, flow interrupters are used that do not allow the fluid to fully circulate in the fluid coupling cavity, thereby removing the negative effect. The object of the study is a hydraulic clutch with partial filling of the flow path used as part of the auxiliary brake system of a car.

Objective The purpose of this paper is to compare two flow interruption systems, assess applicability, and determine the range of effective operation of each system.

Methodology and methods. The finite volume method was used to study two systems for interrupting the flow in a fluid coupling with partial filling.

Results and scientific novelty. The effectiveness and applicability of two flow interruption systems for reducing the residual braking torque in a disconnected hydraulic brake has been evaluated. The distributions of the braking torque, the average circulation speed, as well as the circulation speed in the section for a hydraulic brake with partial filling without flow interruption, using shutter-breakers, as well as for several positions with longitudinal separation of the wheels, are obtained.

Practical significance. The considered systems for interrupting the flow in a fluid coupling with partial filling showed a significant decrease in the residual braking torque. However, the greatest efficiency in a wide range of rotational speeds, compared with the calculation without interruption of the flow, was shown by curtain-breakers, which is probably caused by a large decrease in the circulation rate due to additional resistance.

Introduction. The article considers an oil hydrodynamic retarder with an active diameter of 220 mm. The subject of the study is a comparison of two methods for constructing the moment characteristic of a hydraulic brake - the analytical solution of the Euler equation for turbomachines and the solution by the finite volume method in a three-dimensional formulation, considering flow turbulence. The object of study is the hydraulic clutch, which functions in the stop mode as a node of the auxiliary braking system of the car.

Objective. The purpose of the work is to substantiate the correctness of using the finite volume method for solving problems of this type, as well as to assess the effect of the flow rate passing through the fluid part of the hydraulic brake on its torque characteristic.

Methodology and methods. The features are considered and a comparison is made of two approaches to determining the torque coefficient, as well as constructing the torque characteristic of a hydraulic brake - based on the solution of the Euler equation for turbomachines and the CFD finite volume method.

Results and scientific novelty. It has been established that in the absence of coolant flow through the fluid coupling flow path, the results obtained using the considered methods are qualitatively and quantitatively consistent. The deviation of the results obtained using both methods does not exceed 5%.

Practical significance. In the course of the study, it was shown that the flow rate passing through the fluid coupling has a significant impact on the torque characteristic, as a result of which it was concluded that it is expedient to use a finite volume flow rate for solving this type of problem, if it is necessary to consider the flow of the working fluid through the hydraulic brake cavity.

The article outlines the main points of design based on the definition of target costing for the components of technically complex products. Examples of foreign experience in the application of the method are given. The prospect for the method application in domestic conditions is described. The method of target costing is described. The target costing method is illustrated on the example of the improvement of an already manufactured industrial device used to automate construction work. A number of competitor models in the same price group were selected based on a marketing analysis. The functional-cost analysis determines the integral importance of the main functions. Based on the calculated cost and function-cost analysis, the new value of the functions and components of the apparatus were calculated. The conclusion about the applicability of the target cost method is given.

The issue of obtaining primary information and its application to ensure the safe and efficient operation of the equipment of the cargo processing enterprise is considered.

The analysis of trends in the operation of lifting machines is carried out. The experience of using the automated unmanned Container Terminal Altenwerder complex in Hamburg has been analyzed. Difficulties in the creation of such complexes, which do not allow fully automated systems to become widespread, are highlighted.

As an example of a more widespread approach of partial automation the experience of using the system of remote monitoring of load-lifting cranes by the PJSC "TransContainer" is given. The problem related to the quality of primary information is revealed.

The principles of construction of the information and management system are presented. The multi-level hierarchical structure of the system is justified. An elementary unit of the system is a separate hoisting machine with technical means of gathering and forming of primary information. Collection of data on all machines of a separate unit is intended for making operational decisions. The upper level combines units and serves to make managerial decisions on planning of financial, material and labor resources of the enterprise (strategic planning).

A data processing algorithm is proposed to determine the intensity of work of lifting equipment.