Performance Simulation Analysis of Modular Heat Dissipation Unit

In this paper, GT suite software is used to model the cooling system of military special vehicles with multiple power sources. The power drive system is composed of main engine, auxiliary engine and four hub motors. By constructing modular cooling unit, the volume of radiator and the layout of cooling unit are changed. While the total volume of radiator is unchanged, the cooling capacity of cooling system is improved. Firstly, the problem is simplified and modeled by high-temperature and low-temperature double circuit. The main engine with power of 600kW and auxiliary engine with power of 200kW are combined into a high-temperature circuit. The water temperature of the circuit is higher, about 90 ºC; Four hub motors with power of 440kw and their electrical components are combined into a low temperature circuit. The water temperature of this circuit is about 60 ºC. By modifying the volume, layout and number of radiators, the temperature of the dual circuit is analyzed, and it is found that when the total radiator volume remains the same, the cooling effect of the multi-radiator layout is better.

Analisa Kegagalan Conrod Bearing Pada Kapal Cepat

Kerusakan conrod bearing pada main engine kapal cepat akibat design material, peningkatan panas yang berlebih pada sistem engine cooling (overheat) dan pengeoperasian. Untuk mengidentifikasi penyebab kerusakan dilaksanakan beberapa pengujian seperti pengamatan visual makro, analisis komposisi kimia, kekerasan mikro dengan vickers, fraktografi,metalografi, pengukuran ketebalan lapisan. Hasil analisis telah terjadi overheating dan deform pada conrod bearing akibat bergesekan dengan connecting rod dan terlihat pada daerah tepi alur adanya gesekan, dan tidak ditemukan lapisan babbit dikarenakan lapisan tersebut sudah lebur (fase liquid) pada temperature 354°C sesuai dengan standar logam babbit ASTM B23-00 2014 serta lapisan back steel mengalami deform.

APPLICATION OF FUZZY ANALYTIC HIERARCHY PROSES FOR ERROR DETECTION OF AUXILARY SYSTEMS OF SHIP MAIN DIESEL ENGINES

Ship engine room has a structure which has to meet a number of needs with regard to administrative conditions. Therefore, when the complicated structure of engine room are considered, even a simple mechanical failure, if no measures taken abruptly, grows into irreversible condition, causing losses that cannot be compensated. A well-qualified ship engine conductor along with an effective error detection system is needed to detect failure and act immediately against any engine impairments possible. This study aims to manage troubleshooting in main engine auxiliary systems which cover cooling, lubricating and cooling oil and fuel systems. The study is also thought to be a good reference for maintenance processes for marine engineering operators. Breakdown of main engine equipment are examined and troubles hooting program is developed for using Fuzzy Analytic Hierarchy Process (F-AHP) determine solution methods and causes of such breakdowns. In this paper, a fuzzy Multi Criteria Decision Making (MCDM) methodology was proposed to determine the most effected system of the ship main diesel engine. The results showed that fuel system was the most effected alternative, as being followed subsequently by cooling system, governor system, air supply system and oiling system. The results were based upon the opinions of three experts groups who ranked the ship main diesel engine systems alternatives according to twenty-nine criteria expert selected.

Rates the Ships Must Pay to Deliver the Oil Sludge as an Incentive to Improve Port Waste Green Logistics

Vessels of the shipping industry produce sludge during the operation of the main engine, various types of auxiliary engines, and the handling of fuel oil on board ships. The sludge can be stored in special tanks and disposed of ashore or burned on board. In the European Union, according to the Port Reception Facilities Directive (EU) 2019/883, ships have to pay a port waste fee for the delivery of ship waste, which is calculated according to the size of the ship. Such an approach does not take into account the capacity of port green waste logistics. In this paper, the case of delivery of ship sludge to ports that are similar in terms of waste logistics capacity is analysed. It is presented as a mathematical game between ships and ports to improve green waste logistics and match the amount of oil sludge that can be discharged from ships to the capacity of ports. The goal of the game is to discourage free-riders, which can occur on both sides, between suppliers and ports. The waste rate can be used as a regulator and incentive that discourages sludge dumping when recycling is not feasible. A model evaluation is proposed using a numerical example.

A FUZZY DEMATEL MODEL PROPOSAL FOR THE CAUSE AND EFFECT OF THE FAULT OCCURRING IN THE AUXILIARY SYSTEMS OF THE SHIPS’ MAIN ENGINE

The ship engine room has a structure that meets a number of needs related to administrative conditions. Even if a simple mechanical error is considered to be the addition of human errors into the complex structure of the engine room, it can lead to undetected loss. How the causes and effects of the detected faults affect the system is as important as an effective fault detection system to detect the fault and take immediate action against any possible engine failure. This study reveals the causes of problems occurring in the main engine auxiliary systems including cooling, lubricating, cooling oil and fuel systems, and the extent of these problems affecting the system. While the Decision Making Trial and Evaluation Laboratory supports to identify and analyze the error detection of auxiliary systems with respect to causal effect relation diagram, fuzzy sets deal with the uncertainty in decision-making and human judgements through the DEMATEL. Therefore, fuzzy DEMATEL approach is applied to examine the causes and the weights of the faults and their relation to each other in the auxiliary systems. When we look at the result of the proposed approach, fuel oil pump failures has more impact on the all system and air cooler problems has the second highest place among the all errors.

Syrian - Lebanese economic relations 1958 – 2000

In the midst of dangerous circumstances and events and the thorny relations between Syria and Lebanon ,the issue of Syrian – Lebanese economic relations 1958 – 2000 came to confirm the depth of the relationship between the two counties and indicate the political tensions and the shadows it casts on economic relations. Perhaps the Syrian – Lebanese relations are among the strangest relations that exist between two countries or Even between two peoples , although it brings together a lot of special circumstances that are difficult to find in other countries , any event , even if it is fleeting , can be exploited in a way that harms the essence of the relationship in which interests may intersect between two ordinary countries that do not have any connection of historical weight or A specific geography , the Syrian – Lebanese relationship is , by virtue of history , concurrent with the emergence of the two states as political entities . This reason and others prompted me to choose this topic , which embodies the volume of trade and economic exchange between the two countries and clearly embodies the repercussions of the relationship , which passes from one period to another in a state of ebb and flow . This study sheds light on the economic relations between the two countries , although it is difficult to ignore the impact of the political conditions on them , as they are the main engine , and the decline in economic relations is only a reaction to the crisis policy in many cases . in writing this research , the researcher used the descriptive method of history , and he used an important number of sources that enriched the subject , such as the Lebanese – Syrian relations of the authors Antoine AL-Nashef and Khalil AL-Hindi , as well as the Lebanese – Syrian relations1985 -1943 issued by the Lebanese Documentation and Research Center and last but not least l hope this study will be successful in terms of providing information and facts to the lraqi offices and contributing to their enrichment and providing assistance to the lraqi researcher .

A Critique of Marketism: Varieties of Exchanges in China’s Past and Present

The theory and ideology of mainstream Anglo-American “marketism” do not accord with reality. Its core idea—equating all trade with equal and mutually beneficial market exchanges, and believing that such exchanges are certain to lead to division of labor and transformative changes in labor productivity—is a one-sided, idealized construction. It erases unequal exchanges under imperialism and ignores the realities of the use of cheap informal labor in developing countries by hegemonic capital in the globalized economy. It also disregards pervasive unethical pursuits of profit among producers and widespread human weaknesses among consumers. If we proceed instead from China’s actual experiences, we can come to see and grasp the many different varieties of trade that differ from the abstractions of conventional marketism, including the “commercialization of extraction” that long characterized the principally unidirectional “trade” based on severe inequities between town and country, as well as the “growth without (labor productivity) development,” or “involutionary commercialization,” that long characterized domestic Chinese commerce that emerged under severe population pressures on the land. If we turn instead to the “take-off” period of the recent decades in Chinese economic development, we can see also the great contrast between Chinese realities and the mainstream economics construct of a “laissez faire state,” and see instead the state engaging most actively in development, and state-owned enterprises working closely together with private enterprises. Those realities are perhaps most evident in the recent dramatic development of China’s mammoth real estate economy that has been the main engine of rapid development since about 2000—most especially in its immense process of the “capitalization of land.” We can also see how the tradition of the “socialist planned economy” has operated in unison with the new capitalist market economy, by combining the twin ideals and mechanisms of “people’s livelihood” and “private profit.” What is needed is a new kind of political economy that can grasp and illuminate such changes.

Protecting Half the Planet and Transforming Human Systems Are Complementary Goals

The unfolding crises of mass extinction and climate change call for urgent action in response. To limit biodiversity losses and avert the worst effects of climate disruption, we must greatly expand nature protection while simultaneously downsizing and transforming human systems. The conservation initiative Nature Needs Half (or Half Earth), calling for the conservation of half the Earth's land and seas, is commensurate with the enormous challenges we face. Critics have objected to this initiative as harboring hardship for people near protected areas and for failing to confront the growth economy as the main engine of global ecological destruction. In response to the first criticism, we affirm that conservation policies must be designed and implemented in collaboration with Indigenous and local communities. In response to the second criticism, we argue that protecting half the Earth needs to be complemented by downscaling and reforming economic life, humanely and gradually reducing the global population, and changing food production and consumption. By protecting nature generously, and simultaneously contracting and transforming the human enterprise, we can create the conditions for achieving justice and well-being for both people and other species. If we fail to do so, we instead accept a chaotic and impoverished world that will be dangerous for us all.

A Theory of Human Flourishing for Company Decision-Making

<p>Business is one engine of well-being, and the main engine of material well-being, in society. Companies produce goods and services that we would not be able to do without or that add comfort or pleasure to our lives, provide us with jobs, and help make our communities dynamic and lively. Still, businesses come increasingly under criticism for being the cause of many social, environmental and economic problems, and are often seen as prospering at the expense of individual people and the broader society. Also, as customers or employees of businesses, we are frequently dissatisfied with substandard product quality, unfriendly service, a work community in which not everyone is pulling in the same direction or leaders who do not inspire. We invest many resources and much energy and time in our roles that have to do with companies. In such a situation, it seems justified to ask whether businesses are fulfilling their potential, if viewed as agents of well-being. My thesis aims to be one contribution to the active academic, political and societal debate we have in the Western world on the appropriate evolution of businesses in the 2010s. Faced with intensifying competition from developing world produce, large private and public sector debts restricting consumption opportunities at home, and social and environmental concerns about ways companies operate, Western businesses are re-thinking their strategies. Many progressive companies are going even further and are revising their objectives in ways that challenge our traditional conception of what a business is, what it does and how.</p>